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.
1<apex:page standardController="Account">
2 <apex:pageBlock title="Hello {!$User.FirstName}!">
3 You are displaying contacts from the {!account.name} account.
4 Click a contact's name to view his or her details.
5 </apex:pageBlock>
6 <apex:pageBlock title="Contacts">
7 <apex:form>
8 <apex:dataTable value="{!account.Contacts}" var="contact" cellPadding="4"
9 border="1">
10 <apex:column>
11 <apex:facet name="header">Name</apex:facet>
12 <apex:commandLink>
13 {!contact.Name}
14 <apex:param name="cid" value="{!contact.id}"/>
15 </apex:commandLink>
16 </apex:column>
17 <apex:column>
18 <apex:facet name="header">Phone</apex:facet>
19 {!contact.Phone}
20 </apex:column>
21 </apex:dataTable>
22 </apex:form>
23 </apex:pageBlock>
24 <apex:detail subject="{!$CurrentPage.parameters.cid}" relatedList="false" title="false"/>
25</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,
1https://Salesforce_instance/apex/MyFirstPage?id=001D000000IRt53