Visualforce Developer Guide
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Getting and Setting Query String Parameters on a Single Page
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.
This is possible by:
- Wrapping the data table in an <apex:form> tag
- Turning each contact name into an <apex:commandLink> that sets the cid parameter appropriately with an <apex:param> tag
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>After saving this markup, refresh your browser with the id query string parameter
but without the cid parameter
in the URL For example,
https://MyDomain_login_URL/apex/MyFirstPage?id=001D000000IRt53