Suppose you have a Visualforce page with a form and you have a link to open a popup. The page loaded in popup needs to set a value back into a textbox in the parent page. Here is how you can achieve this:
This is sample code of the parent Visualforce page:
<apex:page standardController=" ">
<apex:form id="theForm">
<apex:pageBlock id="thePageBlock">
<apex:pageblockSection id="theSection">
<apex:inputfield value=" ” id="Namefield"/>
<apex:pageblockSection>
<apex:pageblockButtons >
<apex:commandButton onclick="window.open('/apex/page2?name={!$Component.theForm.thePageBlock.theSection.Namefield}’);”/>
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