Having seen examples of both getting and setting query string parameters, this example shows how the two actions can be combined on a single page to produce a more interesting result. Based on the example from Getting Query String Parameters, the following page makes the name of each contact in the list a hyperlink that controls the context of the detail component below it.
When used with a standard controller, command links always entirely refresh the current page with the new information added to the page—in this case, an updated cid that updates the contact detail component.
<apex:page standardController="Account"> <apex:pageBlock title="Hello {!$User.FirstName}!"> You are displaying contacts from the {!account.name} account. Click a contact's name to view his or her details. </apex:pageBlock> <apex:pageBlock title="Contacts"> <apex:form> <apex:dataTable value="{!account.Contacts}" var="contact" cellPadding="4" border="1"> <apex:column> <apex:facet name="header">Name</apex:facet> <apex:commandLink> {!contact.Name} <apex:param name="cid" value="{!contact.id}"/> </apex:commandLink> </apex:column> <apex:column> <apex:facet name="header">Phone</apex:facet> {!contact.Phone} </apex:column> </apex:dataTable> </apex:form> </apex:pageBlock> <apex:detail subject="{!$CurrentPage.parameters.cid}" relatedList="false" title="false"/> </apex:page>
https://Salesforce_instance/apex/MyFirstPage?id=001D000000IRt53