What is the use of apex:facet in Salesforce Visualforce?

Hi kapil,

A placeholder for content that is rendered in a specific part of the parent component, such as the header or footer of an

< apex:dataTable >.

An < apex:facet > component can only exist in the body of a parent component if the parent supports facets. The name of the facet component must match one of the pre-defined facet names on the parent component. This name determines where the content of the facet component is rendered. Consequently, the order in which a facet component is defined within the body of a parent component does not affect the appearence of the parent component.

Example:

<apex:page standardController="Account">

<apex:pageBlock title="Contacts">

<apex:dataTable value="{!account.Contacts}" var="contact" cellPadding="4" border="1">

<apex:column >

<apex:facet name="header">Name</apex:facet>

{!contact.Name}

</apex:column>

<apex:column >

<apex:facet name="header">Phone</apex:facet>

{!contact.Phone}

</apex:column>

</apex:dataTable>

</apex:pageBlock>

</apex:page>