Visualforce Interview Questions and Answers

Post author:Admin
Post published:April 22, 2018
Post category:Salesforce

Top Visualforce Developer Interview Questions and Answers- Here are some of the following Visualforce Interview Questions and Answers that are generally asked in Salesforce interviews.

What is Visualforce?

What is Visualforce controller in salesforce? What are they?

What is Standard Controller?

What is Standard List Controller?

What is Custom Controller?

What are the tasks of standard controller?

How can you create visualforce page in salesforce?

What is <apex:page> tag in visualforce markup?

How can we enable visualforce editor?

What are expressions used in pages to bind in controllers?

What is the purpose of controllers?

Which objects have associated standard controllers?

What is included with each standard controller?

When do you need to go beyond a standard controller and code custom Apex?

What identifies a controller as being an extension?

What are the different AJAX action tags? What does each do?

actionStatus: used to display start and stop statuses of AJAX requests.
actionSupport: used to call a second component when an event happens to the first component.
actionPoller: similar to actionSupport, but the event is based on a timer instead of a user action.
actionFunction: provides support for invoking a controller action from JavaScript code using an AJAX request by defining a new JavaScript function.
actionRegion: used to demarcate which parts of the page the server should reprocess.

What are the Global Key words?

We have global keywords like component,User,url,current page etc., to access various values from components on page, from user object or from url or from current page fields. To access value from each source, we have different global keywords. One such keyword is explained in above question(!$component)

Various global keywords are:

URL
USER
PROFILE
Resource
Component
Current page
Page reference etc.

What are static resources?

What is the main difference between using dataTable vs. pageBlockTable tags?

What are attributes? What is the syntax for including them?

What are the Rendered, Rerendered and Renderas in Visualforce page?

Render: It’s a Boolean value, It works like “display” property of CSS. Used to show or hide element. (if it is true, it displays the block else it will be hidden)

Rerender: After Ajax which component should be refreshed. For this you need to assign id to field, sections or a block. it’s available on commandlink, commandbutton, actionsupport etc.

RenderAs: Render visualforce page as pdf, doc or excel.

What is the purpose of <script> Tags?

Why are properties helpful in controllers?

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