PD1 Visualforce Pages 4

Question 1

Which Visualforce component enables partial page updates (AJAX) without a full page refresh?

Accepted Answer

<apex:actionSupport>

Answer

<apex:actionSupport> adds AJAX behavior to a parent component, calling a controller action and re-rendering specified targets on an event.

Question 2

What is the purpose of the 'reRender' attribute in Visualforce AJAX components?

Accepted Answer

It specifies the IDs of components to refresh after a server action completes

Answer

The reRender attribute takes a comma-separated list of component IDs to refresh via AJAX after the server action completes.

Question 3

Which Visualforce controller type allows you to work with records that are NOT based on a single sObject?

Accepted Answer

Custom Controller

Answer

A Custom Controller is a full Apex class that replaces the standard controller, allowing you to define arbitrary logic not tied to a single sObject.

Question 4

How do you pass a parameter from a Visualforce page to a controller method using <apex:actionFunction>?

Accepted Answer

Use child elements inside

Answer

elements nested inside bind JavaScript variable values to controller properties before the action fires.

Question 5

Which Visualforce tag is used to define sections within a <apex:pageBlock> that display fields in a two-column layout?

Accepted Answer

<apex:pageBlockSection>

Answer

<apex:pageBlockSection> creates a two-column section within a pageBlock, automatically organizing fields into label-value pairs.

(PD1) Salesforce Certified Platform Developer 1 Practice Test