Salesforce Visualforce Interview Questions and Answers

In below post we will discuss about Salesforce Visualforce Interview Questions and Answers

Can ‘set’ store duplicate values in it?

No. Set only stores unique values. List can have duplicate values in it.

Can two users have the same profiles?

Yes

How can you refresh a particular section of a visual force page?

This can be done using reRender attribute

How to get current logged in users id in apex ?

Use Userinfo.getuserid() to get the current logged in user’s id in apex.

How to convert a CSV file browsed in visualforce page into a string?

Use csvfilecontents.tostring(). method to convert blob to string

How to fire dynamic query in SOQL?

Using database.query Example: List accList = Database.query(‘select name from account’);

What is a bucket field in reports?

This field is used for the custom grouping of values in a field. This can be used in summarizing the report.

What are dynamic dashboards?

Dashboards which run for logged in user are dynamic dashboards

Can the dynamic dashboards be scheduled?

No they cannot be scheduled.

How can you use a custom label in visual force page?

Use this syntax for accessing custom label in visualforce page – {!$Label.Samplelabel}

What are the types of custom settings in salesforce?

List type and Hierarchy type

What are the different types of collections in apex?

There are three types of collections in apex language. They are Set, List and Map

What are maps in apex?

Map has keys and values. A key points to a single value. Map can be used to store relationships between two entities. Keys in map are unique. Values can be duplicated.

What are the different types of object relations in salesforce ?

They are One to Many, Many to many and Master-detail

Can you have roll up summary fields in case of parent child relationship?

No. These are present only in case of master details relationship.

What is the difference between action function and action support ?

Action functions can call controller method from java script, action support adds support to other components.

What is action poller in visualforce ?

Action poller sends AJAX request with a specified time interval.

What are the different types of reports available in salesforce?

They are tabular report, Summary Report, Matrix Report and Joined Report

How many active assignments rule can you have in lead/Case?

You can have only one active assignment rule at a time.

How do we access static resource in visualforce?

Use this syntax for accessing static resource {!$Resource.Testresourcename}

How to enable inline editing in visualforce page ?

You can enable inline editing in visualforce page by using component.

What is trigger.new in trigger ?

trigger.new is a list of records that are in the context of trigger or because of these records(modification, Creation, deletion) the trigger has been called

How do we bulkify the trigger ?

Bulkfification requires iterating over all the records in trigger context for example : for(account ac: trigger.new) { // your logic here }

How can we get the old value in trigger?

use trigger.old map for getting previous values of fields.

Can we modify records directly in trigger.new?

trigger.new is a read only list, but field values can be changed in case of before trigger.

What does the error “list has no rows for assignment” mean?

it means the list you are trying to access has no values in it.

What should we do to avoid view state error in visualforce page?

Clear unused collections, define variable as transient.

What is a sandbox org?

It is the exact copy of your production org.

What is sosl?

select query that can return records of multiple objects as list of lists.

What is the full form of AJAX?

it stands for asynchronous java and XML

How can you show a custom error message in trigger?

This can be done using addError() method in trigger

What is the use of future annotation?

Future method starts execution when Salesforce has resources available.That is for asynchronous execution.

How to identify if a class is a test class?

test class always begins with @isTest

How to convert a blob variable into a string?

Use toString to convert blob into string

What are the different methods of batch apex class?

Start method, execute method and finish method

What is’ with sharing’ in apex class code?

When you use ‘with sharing’, user’s permissions and field-level security are respected. In case of ‘without sharing’ code runs in system mode.

Can you use dml statement in visualforce compoenent controller ?

To use dml in visualforce component you have to declare allowdml=true in visualforce component otherwise you will get an exception “DML is currently not allowed”

Can you write sosl in trigger?

Earlier this was not allowed but now sosl are allowed in triggers.

Which are the different access modifiers in apex?

Private, Public, Protected and Global are the four access modifiers allowed in apex.

Can you change the master of a detail record in salesforce ?

Yes provided you have ticked marked “Allow reparenting” in field setting otherwise the field is read only and master cannot be changed.

How can you lock records in apex?

Use For update in query to lock the record.For example: [select id,name from contact limit 20 For update];

What is visualforce component ?

It is a piece of code that can be reused. It can be encapsulated in other visualforce pages.

How can you display the status of an AJAX update request in a visualforce page ?

To display AJAX request status we can use component.

How can you access custom label in apex:

Yes, string custLabelstr = System.Label.LabelNamehere

How can you get all the keys of a map variable ?

Use method keyset() for this Set idSet = mapname.keyset();

How can you compare values of a picklist field in validation rule?

For comparing picklist value use ispickval ISPICKVAL(picklist_field, text_to_compare)

What are the different types of sandboxes in salesforce ?

Developer, Developer Pro, Partial Data and Full are the types of sandboxes in salesforce.

How can you make fields required on a visualforce page?

mark required = true

How can you implement custom functionality for a standardcontroller visualforce page?

This can be done by associating a controller class with that standard controller using “Extensions”

How can you get the current record id in a visualforce page ?

use ApexPages.CurrentPage().getparameters().get(‘id’) to get the current record id in visaulforce page.

Can a user change his own profile in salesforce ?

No, a user cannot change change his own profile.

Can a user change his own role?

Yes this can be done !!

Reset security token option is unavailable in set up. What could be the reason?

If in the profile setting “login ip ranges” have been set up then the option of “reset security token” is unavailable.

What are the different data types that a standard field record name can have?

Record name field can have either of the two data types : Auto Number or Text data type

Can you edit a apex trigger/apex class in production environment ?

No apex trigger /class cannot be edited in production.

Can you edit a visualforce page in production environment ?

Yes this can be done but cannot be associated with any controller

How can you deliver a visualforce page in excel form ?

use contentType=”application/vnd.ms-excel#Contacts.xls” in page component of visualforce page

What is trigger.new?

It is a list of records in current context in a trigger.

How can you create a input field for date on a visualforce page ?

To create a input date field on vf page you will have to bind it with a existing date field on any object.

How can you convert a text to upper string ?

stringname.toUppercase();

How can you convert a integer into a string ?

string.valueof(integerName);

What are the different types of email templates that can be created in salesforce?

Test, HTML (using Letterhead), Custom (without using Letterhead) and Visualforce.

How can you display different picklist values for picklist fields in different page layouts?

This can be done using record types.

Can you do a dml in constructor?

No this cannot be done.

What are the data types that can be returned by a formula field?

They are Checkbox, currency, Date, Date/Time, Number, Percent and Text

Can you create a new profile from scratch ?

No, you have to clone from a existing profile and modify the settings as required.

What are custom labels in salesforce?

Custom labels are custom text values that can be accessed from apex codes and visualforce pages.

Can you use sharing rules to restrict data access?

No, sharing rule can only give wider access to data it cannot restrict data access.

Can you edit roll up summary field values in a record?

No, roll up summary fields are read only and cannot be edited.

How can you create relationship between two objects in salesforce?

Relationship can be set up by crating either look up relationship field or master detail relationship fields on objects.

Can you create a roll up summary field on parent object?

Roll up summary fields can only be created if the relationship between objects is master detail type.

How can you place an entire visualforce page in a different visualforce page?

This can be done using include attribute.

How can you hard delete records in apex?

use emptyrecyclebin method as below . ex- delete myAccList; DataBase.emptyRecycleBin(myAccList);

What all data types can a set store?

A set can store all primitive data types and sObjects but not collections.

What is the use of offset keyword in a soql query?

Using offset keyword return the records starting from desired location in the list. For example if we specify offset then all the records starting from location onwards would be returned.

How can you display an image as an field in a detail page of record?

This can be done using IMAGE function. A url of the image stored in document should be given in image function

When a lead is converted into account/contact will the trigger on account/contact fire?

In set up we can enable or disable whether triggers should run on conversion.

What happens to contacts when an account is deleted?

When an account is deleted all the contacts under it gets deleted.

What is an sObject type?

sObject refers to any object that can be stored i force.com platform database. ex. sObject s = new contact()

How many elements can be stored with in a collection(list,set,map)?

There is no limit on the number of elements that can be stored in a collection. However, we need to consider the heap size limit.

Expand SOQL and SOSL.

SOQL- salesforce object query language, SOSL – salesforce object search language.

What is the difference between soql and sosl?

SOQL can query records from a single object at a time, while sosl can query records from multiple objects. SOQL returns a list while SOSL returns list of lists.

How can you query all records using an soql statement?

This can be done using ALL ROWS keyword. This queries all records including deleted records i recyclebin.

What is the use of @future annotation?

Using @future annotation with a method executes it whenever salesforce has resources available.

What is the significance of static keyword?

Methods, variables when defined as static are initialised only once when class is loaded.Static variables are not transmitted as part of view state for a visualforce page.

Can custom setting be accessed in a test class?

Custom setting data is not available default in a test class. We have to set seeAllData parameter true while defining a test class as below. @isTest(seeAlldata=true)

What is the difference between role and profile?

Role defines record level access while profile defines object level access.

On which objects can you create Queues?

Queues can be created on two standard objects (Lead and case) and also on all custom objects.

What are the different ways to invoke apex code?

Apex code can be invoked using DML operation(trigger), Apex class can be scheduled using schedulable interface(ex. batch apex), apex code can be run through developer console, an apex class can be associated with a visualforce page.

Can you create sharing rules for detail objects?

No. Detail objects cannot have sharing rules as the detail objects do not have owner field with them.

How can view state error be avoided?

Use transient keyword with variables wherever possible, clear unused collections. Use form tag in a visualforce page.

What is the use of writing sharing rules?

Sharing rules extend the record/data access level which is set using OWD, role hierarchy.Sharing rule cannot restrict the data visibility but can only widen it.

Which all field data types can be used as external ids?

An external id can be of type text, number or email type

What is a mini page layout?

Mini page layout defines fields and related list to be displayed in hover detail and console tab. Whenever you hover mouse over any recently viewed record the fields are displayed, related list isnot displayed(fields can be set in mini page layout).Console tab fields and related list on the right hand side are also controlled by mini page layout.

What is the use of console view/console tab?

Console gives list views and related list records for multiple objects on a single screen without any customization (visualforce page or controller)

What is @future annotation in apex?

It is used to indicate that code should be executed asynchronously when salesforce has available resources.

What are the different considerations that must be followed when using @future annotation in apex method?

Method must be static, It must return void and method can have argument of type primitives, collection of primitives or arrays of primitives

What is the difference between List type custom setting and Hierarchy type custom setting?

List type stores static data that can be used in apex code as it is examples could be country codes,currencies etc.Hierarchy type stores data that may change depending on user,profile or org wide default

Where can custom setting data be accessed?

Custom setting data can be accessed in formula fields,validation rules,workflow rules,apex,API

What different return types can be returned by SOQL?

A SOQL can return List of objects, a single object or an intege

What are the different exceptions in apex?

Apex exceptions can be built in or we can also create our own custom exceptions.Exception class is the super class of all the built in exceptions.So as to create a custom exception the class name should end with string ‘exception’ and it should extend any of the built in exception class or other custom exception class

What are governers limit in salesforce?

Governers limit are run time limits that are enforced by salesforce. Governers limits are reset per transaction.

What is an apex transaction?

An apex transaction represents set of operations that are executed as a single synchronous unit.

What does heap in apex mean?

Every apex transaction has its heap. Heap is nothing but the garbage collected at the end of every apex transaction.

How can you expose an apex class as a REST web service in salesforce?

An apex class can be exposed as REST web service by using keyword ‘@RestResource’

What are custom controllers?

Custom controller is an apex class that implements all of the logic for a vf page without leveraging standard controller

Can a custom controller class accept arguments?

No. A custom controller cannot accept any arguments and must use a no argument constructor for outer class.

What different type of method can be defined for VF controllers?

getter methods, setter methods and action methods

What are getter methods, setter methods?

Getter methods retrieve data from controller while setter methods pass data from page to controller.

What is Organisation Wide Default in salesforce?

Organization wide default is used to set default access level for various standard objects and all custom objects. Default access can be set as Public read only, Public read write, Public read write and transfer for different objects.

Can you set default access in Organization wide default for detail objects (detail object in case of master detail relationship)?

No, Detail object will always have default access as ‘Controlled by Parent’ and it cannot be changed.

Can you create sharing rules for detail objects?

No, this cannot be done.

Can standard object appear as detail object?

No, you cannot have standard object as detail object in case of master detail relationship.

What are the differences between list and set?

Set stores only unique elements while list can store duplicates elements.elements stored in list are ordered while those stored in set are unordered.

What is Actionsupport in Salesforce?

component that adds AJAX support to another component, allowing the component to be refreshed asynchronously by the server when a particular event occurs, such as a button click or mouseover

What is Action Region in Salesforce?

actionRegion provides an area of a Visualforce page that decides and separates which components should be processed by the force.com server when an AJAX request is generated. … We will still use reRender attribute on action component to decide area which should be rerendered AJAX request completes

What is view state in Salesforce?

Viewstate data in encrypted and cannot be viewed tools like firebug. To maintain state in a Visualforce page, the Force.com platform includes the state of components, field values, and controller state in a hidden form element. This encrypted string is referred to as the view state and has a limit of 135KB

What is remote action in Salesforce?

Remote action function in salesforce allows user to access any method from any class through javasrcipt methods, and get the result as a javascript object for further manipulation. Points to remember while implementing remote action function: Remote action method should have @RemoteAction annotation

What is Salesforce Actionpoller?

Action poller acts as a timer in visualforce page. It is used to send an AJAX request to the server depending on the time interval (time interval has to be specified or else it defaults to 60 seconds). In the action attribute a controller method gets called

How many records we can print in a Pageblock?

There are times where there are more than 1000 records in the collection to be rendered. When this occurs, the Visualforce collection limit of 1000 is hit and the page doesn’t load

What is future method Salesforce?

The Future Annotation is used to execute a method asynchronously in Salesforce. For example, we can use the future method to make a Web Service callout from an Apex Trigger. Methods with the future annotation must be static and can only return void data type.

What is Pagereference in Salesforce?

The PageReference is one of the most commonly used classes in Visualforce programming. In general, an instance of the PageReference class can be used to refer to another web page

For which criteria in workflow “time dependent workflow action” cannot be created?

created, and every time it’s edited

What is the advantage of using custom settings?

You dont have to query in apex (fire select query) to retrieve the data stored in custom settings.

What is the difference between a standard controller and custom controller

Standard controller inherits all the standard object properties, standard button functionalities can be directly used. Custom controller defines custom functionalities, a standard controller can be extended to develop custom functionalities using keyword “extensions”

Can you have more than one extensions associated with a single page?

Yes we can have more than extensions.

If page is having multiple extensions and if two extensions have methods of same name. Then which method out of these two will be called upon calling from vf page ?

The one which is present in the controller defined on the left side will be called.

What are governor limits ?

Governor limits are the limits imposed by salesforce so as to avoid monopoly by orgs in using salesforce shared resources.

How can we implement pagination in visualforce ?

use standardset controllers for implementing pagination.

How can you override a list button with a visuaflorce page?

Visualforce page should be a list controller that is it should have “recordsetVar” attribute defined in page tag.

What are different ways of deployment in salesforce ?

Change sets, eclipse and ANT

Is it possible to bypass Grant Access Using Hierarchies in case of standard objects ?

No. This is default and cannot be changed.

How can you call a controller method from java script ?

Use action function component to call controller method from java script.

How can you call a visualforce page from a controller method?

Use pagereference object for calling a visualforce page from controller method.

How can you sort a select SOQl query ?

Use order by clause in select query for sorting a list of records.

What is Salesforce Visualforce and how does it work?

Salesforce Visualforce is a framework that allows developers to create custom user interfaces that can be integrated with the Salesforce platform. It uses a tag-based markup language that is similar to HTML and XML, and it can be used to create custom pages, forms, and components.

What is the difference between a Visualforce page and a standard Salesforce page?

A Visualforce page is a custom page that is created using the Visualforce framework, while a standard Salesforce page is a pre-built page that is provided by Salesforce. Visualforce pages allow for greater customization and flexibility, while standard pages are more limited in their capabilities.

How do you create a Visualforce page?

To create a Visualforce page, you need to go to the Visualforce Pages section in the Salesforce setup menu, click on the “New” button, and then use the Visualforce page editor to write your code.

What are some common use cases for Visualforce pages?

Visualforce pages can be used for a wide variety of purposes, such as creating custom forms, displaying data in a custom format, integrating with external systems, and building custom user interfaces.

What is a Visualforce component and how do you create one?

A Visualforce component is a reusable piece of code that can be embedded in other Visualforce pages or components. To create a Visualforce component, you need to create a new file with a .component extension and use the Visualforce markup language to define the component’s behavior and appearance.

What is the difference between a Visualforce page and a Visualforce component?

A Visualforce page is a complete page that can be accessed by a user, while a Visualforce component is a reusable piece of code that can be embedded in other pages or components.

How do you pass data between Visualforce pages and Apex classes?

You can pass data between Visualforce pages and Apex classes using controller methods and properties. You can also use the standard controller and extension mechanisms to access data from the database and expose it to Visualforce pages.

What is a Visualforce controller and how do you create one?

A Visualforce controller is an Apex class that provides the logic and data for a Visualforce page. You can create a controller by writing an Apex class that implements the Visualforce controller interface and includes the necessary methods and properties.

What is a Visualforce extension and how do you create one?

A Visualforce extension is an Apex class that extends an existing controller and provides additional functionality. You can create an extension by writing an Apex class that extends an existing controller class and includes the necessary methods and properties.

How do you bind a Visualforce page to a Salesforce object?

You can bind a Visualforce page to a Salesforce object by using the standard controller for that object and referencing its properties in your Visualforce markup. You can also use custom controllers and extensions to modify the behavior of the standard controller.

What is a Visualforce expression and how do you use it?

A Visualforce expression is a piece of code that is used to evaluate a value or perform an action in a Visualforce page. You can use expressions to bind data to page elements, call controller methods, and perform other operations.

What is a Visualforce binding and how do you use it?

A Visualforce binding is a reference to a property or method in a controller or extension. You can use bindings to display data from Salesforce objects, call controller methods, and perform other operations.

How do you handle errors and exceptions in Visualforce?

You can handle errors and exceptions in Visualforce by using the try-catch block and the ApexPages.addMessage method. You can also use the Visualforce error tag to display error messages to users.

What is a Visualforce action and how do you use it?

A Visualforce action is a method that is called when a user interacts with a page element, such as a button or link. You can use actions to perform operations such as saving data, navigating to other pages, or executing Apex code.

What is a Visualforce action function and how do you use it?

A Visualforce action function is a JavaScript function that can be called from a Visualforce page to perform an action, such as saving data or navigating to another page. You can use action functions to add dynamic behavior to your pages.

What is a Visualforce remote object and how do you use it?

A Visualforce remote object is a JavaScript object that allows you to access Salesforce data from a Visualforce page using JavaScript. You can use remote objects to perform operations such as querying data, creating records, and updating records.

What is a Visualforce custom controller and how do you create one?

A Visualforce custom controller is an Apex class that provides the logic and data for a Visualforce page. You can create a custom controller by writing an Apex class that implements the Visualforce controller interface and includes the necessary methods and properties.

What is a Visualforce controller extension and how do you create one?

A Visualforce controller extension is an Apex class that extends an existing controller and provides additional functionality. You can create an extension by writing an Apex class that extends an existing controller class and includes the necessary methods and properties.

How do you use Visualforce to display data from a Salesforce report?

You can use the Visualforce report chart component to display data from a Salesforce report in a Visualforce page. You can also use the Apex reporting API to query report data and display it in a custom format.

How do you use Visualforce to create a custom dashboard?

You can use the Visualforce dashboard component to create a custom dashboard in Salesforce. You can use the Apex reporting API to query data and display it in a custom format, or you can use Visualforce components to create custom charts and tables.

What is a Visualforce page template and how do you create one?

A Visualforce page template is a reusable layout that can be used to define the structure of multiple Visualforce pages. You can create a page template by defining a new file with a .page template extension and using the Visualforce markup language to define the layout.

How do you use Visualforce to create a custom tab?

You can use the Visualforce tab component to create a custom tab in Salesforce. You can define the contents of the tab using a Visualforce page and specify the tab label and icon.

What is a Visualforce controller extension and how does it differ from a custom controller?

A Visualforce controller extension is an Apex class that extends an existing controller and provides additional functionality, while a custom controller is an Apex class that provides the logic and data for a Visualforce page. The main difference is that a custom controller is responsible for the entire logic and data of the page, while an extension adds additional functionality to an existing controller.

How do you pass data between Visualforce pages using the URL?

You can pass data between Visualforce pages using the URL by appending parameters to the URL and then reading those parameters in the target page. This can be useful for passing data between pages without using a controller.

What is a Visualforce component and how does it differ from a Visualforce page?

A Visualforce component is a reusable piece of code that can be embedded in other Visualforce pages or components, while a Visualforce page is a complete page that can be accessed by a user. Components are typically smaller and more focused than pages, and they can be used to build up more complex pages.

How do you use Visualforce to create a custom button or link?

You can use the Visualforce page button or link component to create a custom button or link in Salesforce. You can define the behavior of the button or link using a Visualforce page, and you can specify the label, icon, and other properties.

How do you use Visualforce to create a custom record-type page layout?

You can use the Visualforce page layout component to create a custom record type page layout in Salesforce. You can define the layout of the page using a Visualforce page, and you can specify which fields and related lists are displayed.

How do you use Visualforce to create a custom search page?

You can use the Visualforce search component to create a custom search page in Salesforce. You can define the search criteria and results using a Visualforce page, and you can specify which fields and objects are searched.

How do you use Visualforce to create a custom home page?

You can use the Visualforce home page component to create a custom home page in Salesforce. You can define the layout and content of the page using a Visualforce page, and you can specify which components and dashboards are displayed.

How do you use Visualforce to create a custom Chatter feed?

You can use the Visualforce Chatter feed component to create a custom Chatter feed in Salesforce. You can define the feed using a Visualforce page, and you can specify which posts and actions are displayed.

How do you use Visualforce to create a custom calendar?

You can use the Visualforce calendar component to create a custom calendar in Salesforce. You can define the events and data displayed on the calendar using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom survey?

You can use the Visualforce survey component to create a custom survey in Salesforce. You can define the questions and answers using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom knowledge base?

You can use the Visualforce knowledge component to create a custom knowledge base in Salesforce. You can define the articles and categories using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom approval process?

You can use the Visualforce approval process component to create a custom approval process in Salesforce. You can define the approval steps and conditions using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom email template?

You can use the Visualforce email template component to create a custom email template in Salesforce. You can define the layout and content of the email using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom lead conversion page?

You can use the Visualforce lead conversion component to create a custom lead conversion page in Salesforce. You can define the layout and content of the page using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom opportunity page layout?

You can use the Visualforce opportunity page layout component to create a custom opportunity page layout in Salesforce. You can define the layout and content of the page using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom case page layout?

You can use the Visualforce case page layout component to create a custom case page layout in Salesforce. You can define the layout and content of the page using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom solution page layout?

You can use the Visualforce solution page layout component to create a custom solution page layout in Salesforce. You can define the layout and content of the page using a Visualforce page, and you can specify which fields and objects are used.

How do you use Visualforce to create a custom contract page layout?

You can use the Visualforce contract page layout component to create a custom contract page layout in Salesforce. You can define the layout and content of the page using a Visualforce page, and you can specify which fields and objects are used.

What is the syntax of Visualforce and how does it differ from HTML?

Visualforce uses a syntax that is similar to HTML, but with some key differences. Visualforce tags start with “apex:” to distinguish them from HTML tags, and they can include attributes that define their behavior and appearance. Visualforce also includes a set of custom tags that can be used to display data from Salesforce objects, such as “apex:dataTable” and “apex:repeat”.

How do you create a Visualforce page in Salesforce?

To create a Visualforce page in Salesforce, you can navigate to the “Pages” section of the Salesforce setup menu and click the “New” button. From there, you can enter the page name, markup, and controller code, and save the page. The page can then be accessed from the Salesforce application or mobile app.

What is a Visualforce controller and how is it used?

A Visualforce controller is a piece of code that defines the behavior of a Visualforce page. Controllers can be written in Apex, a programming language that is specific to Salesforce, and they can include methods and properties that can be accessed from Visualforce pages. Controllers can be used to retrieve data from Salesforce objects, perform business logic, and update records in Salesforce.

What is a Visualforce extension and how is it used?

A Visualforce extension is a piece of code that can be added to an existing controller to extend its functionality. Extensions can be used to add new methods and properties to a controller, or to override existing ones. Extensions are useful when you want to reuse an existing controller in a different context, or when you want to add new functionality to an existing page.

What is a Visualforce component and how is it used?

A Visualforce component is a reusable piece of code that can be included in multiple Visualforce pages. Components can include their own markup, controller code, and styling, and they can be used to encapsulate complex functionality or to provide a consistent user interface across multiple pages. Components can be created using the “apex:component” tag and can be included in other pages using the “apex:include” tag.

How do you pass data between a Visualforce page and its controller?

Data can be passed between a Visualforce page and its controller using properties and methods. Properties are defined in the controller and can be accessed from the page using Visualforce expressions. Methods can be called from the page to execute business logic and update records in Salesforce.

How do you display data from a Salesforce object on a Visualforce page?

Data from a Salesforce object can be displayed on a Visualforce page using the “apex:dataTable” and “apex:repeat” tags. These tags can be used to iterate over a collection of records and display their fields in a table or list. The “apex:outputField” tag can be used to display individual fields from a record.

How do you handle errors and exceptions in Visualforce?

Errors and exceptions can be handled in Visualforce using the “apex:pageMessages” tag and the “ApexPages.addMessage()” method. These mechanisms can be used to display error messages to the user and log exceptions for debugging purposes.

How do you create a custom button or link in Salesforce using Visualforce?

Custom buttons and links can be created in Salesforce using the “apex:commandButton” and “apex:outputLink” tags. These tags can be used to create custom actions that can be added to page layouts or list views. Custom buttons and links can be used to trigger complex business logic or to navigate to custom pages.

How do you create a custom record page in Salesforce using Visualforce?

A custom record page can be created in Salesforce using the “apex:page” tag with the “standardController” attribute set to the name of the object. From there, you can use Visualforce tags to display fields, related lists, and custom components.

How do you create a custom list view in Salesforce using Visualforce?

A custom list view can be created in Salesforce using the “apex:page” tag with the “standardController” attribute set to the name of the object, and the “extensions” attribute set to a custom controller or extension. From there, you can use Visualforce tags to display the list view and provide custom functionality.

How do you create a custom dashboard in Salesforce using Visualforce?

A custom dashboard can be created in Salesforce using the “apex:page” tag with the “standardController” attribute set to the name of the object, and the “extensions” attribute set to a custom controller or extension. From there, you can use Visualforce tags to display charts, tables, and other dashboard components.

How do you create a custom application in Salesforce using Visualforce?

A custom application can be created in Salesforce using the “apex:page” tag with the “standardController” attribute set to the name of the object, and the “extensions” attribute set to a custom controller or extension. From there, you can use Visualforce tags to create custom pages, components, and business logic.

How do you create a custom Apex class in Salesforce?

A custom Apex class can be created in Salesforce by navigating to the “Classes” section of the Salesforce setup menu and clicking the “New” button. From there, you can enter the class name, markup, and controller code, and save the class. The class can then be used in Visualforce pages, triggers, and other Apex code.

How do you create a custom Apex trigger in Salesforce?

A custom Apex trigger can be created in Salesforce by navigating to the “Triggers” section of the Salesforce setup menu and clicking the “New” button. From there, you can enter the trigger name, markup, and controller code, and save the trigger. The trigger can then be associated with a specific object and event, such as “before insert” or “after update”.

How do you create a custom Apex batch class in Salesforce?

A custom Apex batch class can be created in Salesforce by defining a new Apex class that implements the “Database.Batchable” interface. The class can include methods for starting, executing, and finishing the batch, as well as any necessary business logic. The batch class can then be scheduled to run at a specific time or triggered by a specific event.

How do you create a custom Apex REST service in Salesforce?

A custom Apex REST service can be created in Salesforce by defining a new Apex class that implements the “RestResource” interface. The class can include methods that can be accessed by external applications using HTTP requests. The REST service can be used to expose Salesforce data to external applications and integrate Salesforce with other systems.

How do you create a custom Apex SOAP service in Salesforce?

A custom Apex SOAP service can be created in Salesforce by defining a new Apex class that implements the “WebService” interface. The class can include methods that can be accessed by external applications using SOAP requests. The SOAP service can be used to expose Salesforce data to external applications and integrate Salesforce with other systems.

How do you create a custom Apex email service in Salesforce?

A custom Apex email service can be created in Salesforce by defining a new Apex class that implements the “Messaging.InboundEmailHandler” interface. The class can include methods that are executed when an email is received in Salesforce. The email service can be used to process incoming emails and create or update Salesforce records based on the email content.

How do you create a custom Apex scheduled job in Salesforce?

A custom Apex scheduled job can be created in Salesforce by defining a new Apex class that implements the “Schedulable” interface. The class can include methods that are executed at a specific time or interval. The scheduled job can be used to automate business processes and enforce business rules in Salesforce.

How do you create a custom Apex batch job in Salesforce?

A custom Apex batch job can be created in Salesforce by defining a new Apex class that implements the “Database.Batchable” interface. The class can include methods for starting, executing, and finishing the batch, as well as any necessary business logic. The batch job can be scheduled to run at a specific time or triggered by a specific event.

How do you create a custom Apex REST API in Salesforce?

A custom Apex REST API can be created in Salesforce by defining a new Apex class that implements the “RestResource” interface. The class can include methods that can be accessed by external applications using HTTP requests. The REST API can be used to expose Salesforce data to external applications and integrate Salesforce with other systems.

How do you create a custom Apex SOAP API in Salesforce?

A custom Apex SOAP API can be created in Salesforce by defining a new Apex class that implements the “WebService” interface. The class can include methods that can be accessed by external applications using SOAP requests. The SOAP API can be used to expose Salesforce data to external applications and integrate Salesforce with other systems.

How do you create a custom Apex Apex trigger framework in Salesforce?

A custom Apex trigger framework can be created in Salesforce by defining a new Apex class that includes methods and properties for managing triggers in Salesforce. The framework can include logic for handling trigger events, managing trigger context variables, and enforcing trigger best practices.

How do you create a custom Apex batch framework in Salesforce?

A custom Apex batch framework can be created in Salesforce by defining a new Apex class that includes methods and properties for managing batches in Salesforce. The framework can include logic for handling batch events, managing batch context variables, and enforcing batch best practices.

How do you create a custom Apex REST framework in Salesforce?

A custom Apex REST framework can be created in Salesforce by defining a new Apex class that includes methods and properties for managing REST services in Salesforce. The framework can include logic for handling REST requests, managing REST context variables, and enforcing REST best practices.

How do you optimize the performance of a Visualforce page in Salesforce?

The performance of a Visualforce page in Salesforce can be optimized by minimizing the amount of data retrieved from Salesforce, using caching and memoization techniques, and minimizing the use of complex business logic. Additionally, using client-side scripting and styling can help reduce the load on the server and improve the user experience.

How do you debug a Visualforce page in Salesforce?

A Visualforce page in Salesforce can be debugged using the “Developer Console” or the “Visualforce Page Debug Log”. These tools can be used to inspect the page markup, controller code, and server-side logs. Additionally, using system.debug() statements in the controller code can help identify issues and errors.

How do you test a Visualforce page in Salesforce?

A Visualforce page in Salesforce can be tested using the “Visualforce Page Preview” feature or by creating a custom test class. The test class can include methods for testing the page markup, controller code, and business logic. Additionally, using the “System.assert()” method can help ensure that the page is functioning as expected.

How do you deploy a Visualforce page in Salesforce ?

A Visualforce page in Salesforce can be deployed using the “Change Sets” feature or by using a version control system such as Git. Change sets allow you to package and deploy custom components and metadata between Salesforce orgs. Version control systems allow you to track changes to the code and collaborate with other developers.

How do you secure a Visualforce page in Salesforce?

A Visualforce page in Salesforce can be secured by using the “Security” section of the Salesforce setup menu to set up sharing rules, field-level security, and profile permissions. Additionally, using the “rendered” attribute in the page markup can help ensure that the page is only displayed to users with the appropriate permissions.

How do you internationalize a Visualforce page in Salesforce?

A Visualforce page in Salesforce can be internationalized by using the “Translations Workbench” to translate page labels, messages, and other text into different languages. Additionally, using the “apex:outputText” tag with the “lang” attribute can help ensure that the page displays correctly in different languages.

How do you optimize the user experience of a Visualforce page in Salesforce?

The user experience of a Visualforce page in Salesforce can be optimized by using responsive design techniques, minimizing the number of clicks required to complete a task, and providing clear and concise instructions. Additionally, using client-side scripting and styling can help improve the page’s performance and aesthetics.

How do you create a custom Visualforce component in Salesforce?

A custom Visualforce component in Salesforce can be created by defining a new Apex class that extends the “UIComponent” or “UIComponentBase” class. The class can include properties and methods for rendering the component, as well as any necessary business logic. The component can then be used in other Visualforce pages.

How do you create a custom Visualforce controller in Salesforce?

A custom Visualforce controller in Salesforce can be created by defining a new Apex class that implements the “Controller” or “ControllerExtension” interface. The class can include properties and methods for managing the component’s behavior and data, as well as any necessary business logic.

How do you handle AJAX requests in Visualforce?

AJAX requests in Visualforce can be handled using the “apex:actionFunction” tag and the “ActionFunction” class. These mechanisms allow you to execute server-side logic without refreshing the entire page.

How do you use custom settings in Visualforce?

Custom settings in Visualforce can be used to store configuration data and business rules that can be accessed from Visualforce pages and Apex code. Custom settings can be created and managed using the “Custom Settings” section of the Salesforce setup menu.

How do you use custom metadata types in Visualforce?

Custom metadata types in Visualforce can be used to store custom data and business rules that can be accessed from Visualforce pages and Apex code. Custom metadata types can be created and managed using the “Custom Metadata Types” section of the Salesforce setup menu.

How do you use custom objects in Visualforce?

Custom objects in Visualforce can be used to store and manage custom data that is specific to your organization. Custom objects can be created and managed using the “Objects and Fields” section of the Salesforce setup menu.

How do you use custom fields in Visualforce?

Custom fields in Visualforce can be used to store and manage custom data that is specific to your organization. Custom fields can be created and managed using the “Objects and Fields” section of the Salesforce setup menu.

How do you use custom record types in Visualforce?

Custom record types in Visualforce can be used to create and manage different record types for the same object. Custom record types can be created and managed using the “Record Types” section of the Salesforce setup menu.

How do you use custom buttons and links in Visualforce?

Custom buttons and links in Visualforce can be used to create and manage custom actions that can be added to page layouts or list views. Custom buttons and links can be created and managed using the “Buttons, Links, and Actions” section of the Salesforce setup menu.

How do you use custom tabs in Visualforce?

Custom tabs in Visualforce can be used to create and manage custom tabs that can be added to the Salesforce app menu. Custom tabs can be created and managed using the “Tabs” section of the Salesforce setup menu.

How do you use custom objects in Apex?

Custom objects in Apex can be used to store and manage custom data that is specific to your organization. Custom objects can be accessed using the “Schema” namespace and the “sObject” class.

How do you use custom fields in Apex?

Custom fields in Apex can be used to store and manage custom data that is specific to your organization. Custom fields can be accessed using the “Schema” namespace and the “sObject” class.

How do you use custom record types in Apex?

Custom record types in Apex can be used to create and manage different record types for the same object. Custom record types can be accessed using the “RecordType” class and the “Schema” namespace.

How do you use custom settings in Apex?

Custom settings in Apex can be used to store configuration data and business rules that can be accessed from Apex code. Custom settings can be accessed using the “CustomSetting” class and the “Schema” namespace.

How do you use custom metadata types in Apex?

Custom metadata types in Apex can be used to store custom data and business rules that can be accessed from Apex code. Custom metadata types can be accessed using the “CustomMetadata” class and the “Schema” namespace.

How do you use Apex triggers in Salesforce?

Apex triggers in Salesforce can be used to execute custom business logic before or after a record is inserted, updated, deleted, or queried. Apex triggers can be created and managed using the “Triggers” section of the Salesforce setup menu.

How do you use Apex classes in Salesforce?

Apex classes in Salesforce can be used to define custom business logic, data access, and user interface components. Apex classes can be created and managed using the “Classes” section of the Salesforce setup menu.

How do you use Apex methods in Salesforce?

Apex methods in Salesforce can be used to define custom business logic, data access, and user interface components. Apex methods can be called from Visualforce pages, Apex triggers, and other Apex code.

How do you use Apex batch classes in Salesforce?

Apex batch classes in Salesforce can be used to execute custom business logic on large data sets in a batch-processing mode. Apex batch classes can be created and managed using the “Classes” section of the Salesforce setup menu.

How do you use Apex SOAP services in Salesforce?

Apex SOAP services in Salesforce can be used to expose custom business logic and data to external systems using the SOAP protocol. Apex SOAP services can be created and managed using the “Classes” section of the Salesforce setup menu.

How do you use Apex REST services in Salesforce?

Apex REST services in Salesforce can be used to expose custom business logic and data to external systems using the REST protocol. Apex REST services can be created and managed using the “Classes” section of the Salesforce setup menu.

How do you use Apex email services in Salesforce?

Apex email services in Salesforce can be used to process incoming email messages and perform custom business logic based on the email content. Apex email services can be created and managed using the “Email Services” section of the Salesforce setup menu.

How do you use Apex scheduled jobs in Salesforce?

Apex scheduled jobs in Salesforce can be used to execute custom business logic at scheduled intervals. Apex scheduled jobs can be created and managed using the “Scheduled Jobs” section of the Salesforce setup menu.

How do you use Apex test classes in Salesforce?

Apex test classes in Salesforce can be used to test the behavior and performance of Apex code. Apex test classes can be created and managed using the “Classes” section of the Salesforce setup menu.

How do you use Apex exceptions in Salesforce?

Apex exceptions in Salesforce can be used to handle errors and exceptions that occur during the execution of Apex code. Apex exceptions can be caught and handled using the “try-catch” statement.

How do you use Apex debug logs in Salesforce?

Apex debug logs in Salesforce can be used to debug and troubleshoot Apex code. Apex debug logs can be viewed and analyzed using the “Debug Logs” section of the Salesforce setup menu.

How do you use Apex governor limits in Salesforce?

Apex governor limits in Salesforce can be used to manage the amount of system resources that are consumed by Apex code. Apex governor limits can be monitored and managed using the “Limits” class and the “System.debug()” method.

How do you use Apex static variables in Salesforce?

Apex static variables in Salesforce can be used to store and manage shared data across multiple instances of an Apex class. Apex static variables can be defined and accessed using the “static” keyword.

How do you use Apex collections in Salesforce?

Apex collections in Salesforce can be used to store and manage collections of data, such as lists, maps, and sets. Apex collections can be defined and accessed using the “List”, “Map”, and “Set” classes.

How do you use Apex database operations in Salesforce?

Apex database operations in Salesforce can be used to perform database operations, such as insert, update, delete, and query. Apex database operations can be performed using the “Database” class and the “sObject” class.

How do you use Apex DML operations in Salesforce?

Apex DML operations in Salesforce can be used to perform data manipulation language (DML) operations, such as insert, update, delete, and upsert. Apex DML operations can be performed using the “insert”, “update”, “delete”, and “upsert” statements.

How do you use Apex SOQL queries in Salesforce?

Apex SOQL queries in Salesforce can be used to perform database queries using the Salesforce Object Query Language (SOQL). Apex SOQL queries can be performed using the “SELECT” statement and the “Database.query()” method.

How do you use Apex SOSL queries in Salesforce?

Apex SOSL queries in Salesforce can be used to perform text-based searches using the Salesforce Object Search Language (SOSL). Apex SOSL queries can be performed using the “FIND” statement and the “Database.search()” method.

How do you use Apex transactions in Salesforce?

Apex transactions in Salesforce can be used to group multiple database operations into a single transaction. Apex transactions can be used to ensure data consistency and rollback changes if an error occurs.

How do you use Apex asynchronous processing in Salesforce?

Apex asynchronous processing in Salesforce can be used to execute custom business logic in the background, without blocking the user interface or other processes. Apex asynchronous processing can be performed using the “System.startAsync()” method and the “Queueable” interface.

How do you use Apex email templates in Salesforce?

Apex email templates in Salesforce can be used to create custom email templates that can be used to send emails from Apex code. Apex email templates can be created and managed using the “EmailTemplate” object and the “Messaging.SingleEmailMessage” class.

How do you use Apex dynamic bindings in Salesforce?

Apex dynamic bindings in Salesforce can be used to create dynamic references to objects, fields, and other elements in Apex code. Apex dynamic bindings can be created using the “Type” class and the “describe” methods.

How do you use Apex dynamic SOQL queries in Salesforce?

Apex dynamic SOQL queries in Salesforce can be used to create dynamic SOQL queries that can be used to query data based on dynamic criteria. Apex dynamic SOQL queries can be created using the “Database.query()” method and the “String.format()” method.

How do you use Apex dynamic SOSL queries in Salesforce?

Apex dynamic SOSL queries in Salesforce can be used to create dynamic SOSL queries that can be used to search text-based data based on dynamic criteria. Apex dynamic SOSL queries can be created using the “Database.search()” method and the “String.format()” method.

How do you use Apex dynamic DML operations in Salesforce?

Apex dynamic DML operations in Salesforce can be used to create dynamic DML operations that can be used to perform database operations based on dynamic criteria. Apex dynamic DML operations can be created using the “Database.executeBatch()” method and the “Type” class.

How do you use Apex dynamic Apex transactions in Salesforce?

Apex dynamic Apex transactions in Salesforce can be used to create dynamic Apex transactions that can be used to group multiple database operations into a single transaction based on dynamic criteria. Apex dynamic Apex transactions can be created using the “Savepoint” class and the “Database.setSavepoint()” method.

How do you use Apex dynamic Apex exceptions in Salesforce?

Apex dynamic Apex exceptions in Salesforce can be used to create dynamic Apex exceptions that can be used to handle errors and exceptions based on dynamic criteria. Apex dynamic Apex exceptions can be created using the “Exception” class and the “System.Exception()” constructor.

How do you use Apex dynamic Apex collections in Salesforce?

Apex dynamic Apex collections in Salesforce can be used to create dynamic Apex collections that can be used to store and manage collections of data based on dynamic criteria. Apex dynamic Apex collections can be created using the “List”, “Map”, and “Set” classes and the “Type” class.

How do you use Apex dynamic Apex database operations in Salesforce?

Apex dynamic Apex database operations in Salesforce can be used to create dynamic Apex database operations that can be used to perform database operations based on dynamic criteria. Apex dynamic Apex database operations can be created using the “Database” class and the “Type” class.

How do you use Apex dynamic Apex DML operations in Salesforce?

Apex dynamic Apex DML operations in Salesforce can be used to create dynamic Apex DML operations that can be used to perform data manipulation language (DML) operations based on dynamic criteria. Apex dynamic Apex DML operations can be created using the “Database” class and the “Type” class.

How do you use Apex dynamic Apex SOQL queries in Salesforce?

Apex dynamic Apex SOQL queries in Salesforce can be used to create dynamic Apex SOQL queries that can be used to query data based on dynamic criteria. Apex dynamic Apex SOQL queries can be created using the “Database.query()” method and the “Type” class.

How do you use Apex dynamic Apex SOSL queries in Salesforce?

Apex dynamic Apex SOSL queries in Salesforce can be used to create dynamic Apex SOSL queries that can be used to search text-based data based on dynamic criteria. Apex dynamic Apex SOSL queries can be created using the “Database.search()” method and the “Type” class.

How do you use Apex dynamic Apex transactions in Salesforce?

Apex dynamic Apex transactions in Salesforce can be used to create dynamic Apex transactions that can be used to group multiple database operations into a single transaction based on dynamic criteria. Apex dynamic Apex transactions can be created using the “Savepoint” class and the “Type” class.

How do you use Apex dynamic Apex asynchronous processing in Salesforce?

Apex dynamic Apex asynchronous processing in Salesforce can be used to execute custom business logic in the background, without blocking the user interface or other processes, based on dynamic criteria. Apex dynamic Apex asynchronous processing can be performed using the “System.startAsync()” method and the “Type” class.

How do you use Apex dynamic Apex email templates in Salesforce?

Apex dynamic Apex email templates in Salesforce can be used to create dynamic Apex email templates that can be used to create custom email templates based on dynamic criteria. Apex dynamic Apex email templates can be created using the “EmailTemplate” object and the “Type” class.

How do you use Apex dynamic Apex dynamic bindings in Salesforce?

Apex dynamic Apex dynamic bindings in Salesforce can be used to create dynamic Apex dynamic bindings that can be used to create dynamic references to objects, fields, and other elements based on dynamic criteria. Apex dynamic Apex dynamic bindings can be created using the “Type” class and the “describe” methods.

How do you use Apex dynamic Apex dynamic SOQL queries in Salesforce?

Apex dynamic Apex dynamic SOQL queries in Salesforce can be used to create dynamic Apex dynamic SOQL queries that can be used to query data based on dynamic criteria. Apex dynamic Apex dynamic SOQL queries can be created using the “Database.query()” method and the “Type” class.

How do you use Apex dynamic Apex dynamic SOSL queries in Salesforce?

Apex dynamic Apex dynamic SOSL queries in Salesforce can be used to create dynamic Apex dynamic SOSL queries that can be used to search text-based data based on dynamic criteria. Apex dynamic Apex dynamic SOSL queries can be created using the “Database.search()” method and the “Type” class.

How do you use Apex dynamic Apex dynamic DML operations in Salesforce?

Apex dynamic Apex dynamic DML operations in Salesforce can be used to create dynamic Apex dynamic DML operations that can be used to perform data manipulation language (DML) operations based on dynamic criteria. Apex dynamic Apex dynamic DML operations can be created using the “Database” class and the “Type” class.

How do you use Apex dynamic Apex dynamic Apex transactions in Salesforce?

Apex dynamic Apex dynamic Apex transactions in Salesforce can be used to create dynamic Apex dynamic Apex transactions that can be used to group multiple database operations into a single transaction based on dynamic criteria. Apex dynamic Apex dynamic Apex transactions can be created using the “Savepoint” class and the “Type” class.

What is the purpose of the apex:page tag in Visualforce markup?

The apex:page tag represents a single Visualforce page. Every page must start and end with this tag.

How can we enable the Visualforce editor?

To enable the Visualforce editor, check the “development mode” checkbox at the user level. This can be done by going to the user details page and selecting the “development mode” checkbox.

What are expressions used in pages to bind in controllers?

Expressions are used to bind data between Visualforce pages and controllers. Getter methods return values from the controller to the page, setter methods pass values from the page to the controller, and action methods redirect to another page.

What is the purpose of controllers in Visualforce?

Controllers provide the data and actions that are available to a Visualforce page. They provide business logic to Visualforce pages, taking data from the user in the form of input values, manipulating the user’s input, and acting on the user’s behalf.

Which objects have associated standard controllers?

All standard and custom objects that can be accessed via the API have associated standard controllers.

What does “with sharing” mean in an Apex class code?

Using “with sharing” in an Apex class ensures that the user’s permissions and field-level security are respected. The code runs in the current user’s context, following the sharing rules and visibility settings defined in Salesforce.

Can DML statements be used in a Visualforce component controller?

Yes, DML statements can be used in a Visualforce component controller. However, the “allowDML=true” attribute must be declared in the Visualforce component to allow DML operations.

Can SOSL be written in a trigger?

Previously, SOSL was not allowed in triggers. However, Salesforce now allows the use of SOSL in triggers.

What are the different access modifiers available in Apex?

Apex provides four access modifiers: Private, Public, Protected, and Global. These modifiers control the visibility and accessibility of variables, methods, classes, and interfaces within and outside of the class hierarchy.

Can the master of a detailed record be changed in Salesforce?

Yes, it is possible to change the master of a detailed record in Salesforce, provided that the “Allow reparenting” checkbox is enabled in the field settings.

How can records be locked in Apex?

To lock records in Apex, you can use the “FOR UPDATE” clause in SOQL queries.

What is a Visualforce component?

A Visualforce component is a reusable piece of code that encapsulates a specific functionality or user interface element.

How can the status of an AJAX update request be displayed on a Visualforce page?

The status of an AJAX update request can be displayed using the apex:actionStatus component.

How can a custom label be accessed in Apex?

To access a custom label in Apex, you can use the System.Label.LabelName syntax.

How can all the keys of a map variable be retrieved?

To retrieve all the keys of a map variable, you can use the keySet() method.

How can the values of a picklist field be compared in a validation rule?

The values of a picklist field can be compared in a validation rule using the “ISPICKVAL” function.

What are the different types of sandboxes in Salesforce?

Salesforce provides various types of sandboxes for development, testing, and staging purposes. The different types of sandboxes include Developer Sandbox, Developer Pro Sandbox, Partial Data Sandbox, and Full Sandbox.

How can fields be made required on a Visualforce page?

To make fields required on a Visualforce page, you can use the “required” attribute.

How can custom functionality be implemented for a Visualforce page with a Standard Controller?

Custom functionality can be implemented for a Visualforce page with a Standard Controller by associating a custom Apex controller class with the Standard Controller using “Extensions”.

How can the current record ID be retrieved on a Visualforce page?

To retrieve the current record ID on a Visualforce page, you can use the ApexPages.CurrentPage().getParameters().get(‘id’) method.

What different data types can a standard record name field have?

The standard record name field in Salesforce can have either of two data types: Auto Number or Text.

How can a Visualforce page be delivered in Excel format?

To deliver a Visualforce page in Excel format, you can specify the content type as “application/vnd.ms-excel#Contacts.xls” in the page component of the Visualforce page.

What is Trigger.new?

Trigger.new is a list or collection that contains all the new records that are being processed in the current context of an Apex trigger.

How can an input field for a date be created on a Visualforce page?

To create an input field for a date on a Visualforce page, you can use the apex:inputField tag and bind it to an existing date field on an object.

How can a text string be converted to uppercase in Apex?

To convert a text string to uppercase in Apex, you can use the toUpperCase() method of the String class.

How can an integer be converted into a string in Apex?

To convert an integer into a string in Apex, you can use the String.valueOf() method.

What are the different types of email templates that can be created in Salesforce?

Salesforce provides various types of email templates to cater to different communication needs. The types include Text, HTML with Letterhead, Custom without Letterhead, and Visualforce.

How can different picklist values for picklist fields be displayed in different page layouts?

You can achieve this by utilizing Record Types in Salesforce. By creating different Record Types for the same object and assigning different picklist field values to each Record Type, you can control which picklist values are available for selection based on the page layout assigned to each Record Type.

What are the data types that can be returned by a formula field?

Formula fields in Salesforce can return various data types depending on the formula expression and the fields involved. The supported data types include Checkbox, Currency, Date, Date/Time, Number, Percent, and Text.

Can a new profile be created from scratch in Salesforce?

No, it is not possible to create a new profile from scratch in Salesforce. Profiles are predefined and come with a set of preconfigured permissions and settings. However, you can clone an existing profile and modify its settings as needed to create a custom profile.

What are custom labels in Salesforce?

Custom labels in Salesforce are custom text values that can be accessed from Apex code, Visualforce pages, and Lightning components. They provide a way to store and manage text that may need to be translated into multiple languages or reused in different parts of an application.

What are the different ways to invoke Apex code?

Apex code can be invoked in various ways, including through DML operations such as triggers, by scheduling an Apex class using the Schedulable interface (e.g., Batch Apex), by running Apex code through the Developer Console, and by associating an Apex class with a Visualforce page.

Can sharing rules be used to restrict data access?

No, sharing rules cannot be used to restrict data access. They can only be used to extend the level of record/data access beyond the organization-wide defaults (OWD) and role hierarchy.

How can view-state errors be avoided?

View-state errors can be avoided by using the “transient” keyword with variables whenever possible to exclude them from view state serialization, clearing unused collections or reducing their size, and using the apex:form tag to separate and minimize the size of view state for each form.

What is the purpose of writing sharing rules?

Sharing rules are used to extend the level of record/data access beyond the organization-wide defaults (OWD) and role hierarchy. They allow you to broaden the visibility of records but cannot restrict it.

Which field data types can be used as external IDs?

External IDs in Salesforce can be of three types: Text, Number, and Email.

What is a mini page layout?

A mini page layout in Salesforce is used to define the fields and related lists that are displayed in the hover details and console tabs.

What are governor limits in Salesforce?

Governor limits are runtime limits enforced by the platform to ensure efficient and fair resource usage. These limits control the amount of resources such as CPU time, heap size, database queries, and more that can be consumed by an Apex transaction. Governor limits are reset for each transaction.

What is an Apex transaction?

In Salesforce, an Apex transaction represents a set of operations that are executed as a single synchronous unit. It includes the execution of triggers, workflow rules, validation rules, assignment rules, and other processes related to the transaction. A transaction can involve the manipulation of multiple records and can span across multiple DML statements.

What does “heap” in Apex refer to?

In Apex, the “heap” refers to the memory allocated to an Apex transaction. It is used to store objects, variables, and other data during the execution of the transaction.

How can an Apex class be exposed as a REST web service in Salesforce?

To expose an Apex class as a REST web service in Salesforce, you can use the “@RestResource” annotation. By adding this annotation to the class definition, you make the methods within the class accessible as RESTful endpoints that can be invoked via HTTP requests.

What are custom controllers in Salesforce?

Custom controllers in Salesforce are Apex classes that provide the logic for Visualforce pages without leveraging the standard controller functionality. They allow developers to define custom behavior and data manipulation for the associated Visualforce pages.

Can a custom controller class accept arguments?

Yes, a custom controller class can accept arguments by defining a constructor that accepts parameters.

What is a remote action in Salesforce?

A remote action in Salesforce allows the invocation of Apex methods from JavaScript methods and retrieves the result as a JavaScript object for further manipulation. It enables seamless communication between the client-side JavaScript code and the server-side Apex code.

What is Salesforce ActionPoller?

Salesforce ActionPoller is a Visualforce component used as a timer on a Visualforce page. It sends an AJAX request to the server at specified time intervals (default is 60 seconds) using the action attribute to call a controller method. ActionPoller is commonly used to update data on the page without requiring a full page refresh.

How many records can be printed in a PageBlock in Salesforce?

In Salesforce, the PageBlock component has a default limit of displaying 1,000 records. If the collection of records exceeds this limit, the Visualforce page may not load properly. Developers should consider implementing pagination or other techniques to handle large datasets.

What is the purpose of the “@future” method in Salesforce?

The “@future” annotation in Salesforce Apex is used to execute a method asynchronously in the future. It allows long-running or time-consuming operations, such as sending emails, making callouts, or performing complex calculations, to be executed without impacting the immediate response.

What is the significance of the “static” keyword in Apex?

In Apex, the “static” keyword is used to define a variable or method that belongs to the class itself rather than an instance of the class. Static variables and methods can be accessed without creating an instance of the class and are shared among all instances of the class.

Can custom settings be accessed in a test class?

By default, custom settings data is unavailable in a test class. To access custom settings data, you must set the “seeAllData” parameter to true in the test class annotation: @isTest(seeAllData=true). However, it is recommended to avoid relying on existing data and create test data within the test class.

What is the difference between a role and a profile?

In Salesforce, a role defines record-level access and determines the level of data visibility for users within the organization. On the other hand, a profile defines object-level access and specifies the permissions and settings that users have for specific objects and features in Salesforce.

On which objects can queues be created?

Queues can be created on two standard objects, Lead and Case, and on all custom objects in Salesforce.

 

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