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What is the Difference Between Rendered, Rerender, RenderAs in Visualforce page

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What is the Difference Between Rendered, Rerender, RenderAs in Visualforce page?

SFDC-Interview-Questions-AnswersRendered it is used to show and hide elements works like css in general we can say display properties
<apex:pageBlock rendered=”{!ShowpageBlock}”>
Account Name  :<apex:outputField value=”{!Account.Name}”/>
Account Number :<apex:outputField value=”{!Account.AccountNumber}”/>
</apex:pageBlock>

Rerender is used when you want to refresh only a portion
reRender= “pgblck1, pgbcl2”

RenderAs providing extension of page to create output like pdf, doc, excel
<apex:page standardController=”Account” renderAs=”pdf”>
<apex:pageBlock >
<apex:outputField value=”{!Account.name}”/>
<apex:outputField value=”{!Account.AccountNumber}”/>
</apex:pageBlock>
</apex:page>

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