Visualforce Developer Guide

Introducing Visualforce
Tools for Visualforce Development
Getting a Quick Start with Visualforce
Compile Visualforce Successfully
Creating Your First Page
Displaying Field Values with Visualforce
Using the Visualforce Component Library
Override an Existing Page with a Visualforce Page
Redirecting to a Standard Object List Page
Using Input Components in a Page
Adding and Customizing Input Field Labels
Setting the Tab Order for Fields in a Form
Adding Dependent Fields to a Page
Create Visualforce Dashboard Components
Displaying Related Lists for Custom Objects
Enabling Inline Editing
Converting a Page to a PDF File
Building a Table of Data in a Page
Editing a Table of Data in a Page
Using Query String Parameters in a Page
Getting Query String Parameters
Setting Query String Parameters in Links
Getting and Setting Query String Parameters on a Single Page
Use Ajax in a Page
Put Visualforce Pages on External Domains
Customizing the Appearance and Output of Visualforce Pages
Standard Controllers
Standard List Controllers
Custom Controllers and Controller Extensions
Advanced Examples
Override Buttons, Links, and Tabs with Visualforce
Using Static Resources
Creating and Using Custom Components
Dynamic Visualforce Bindings
Dynamic Visualforce Components
Integrate Email with Visualforce
Visualforce Charting
Creating Maps with Visualforce
Render Flows with Visualforce
Templating with Visualforce
Developing Salesforce Apps with Visualforce
Adding Visualforce to a Salesforce AppExchange App
Using JavaScript in Visualforce Pages
Communicating Across the DOM with Lightning Message Service
Visualforce Best Practices
Standard Visualforce Component Reference
Appendices
PDF

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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 pageā€”in this case, an updated cid that updates the contact detail component.

After saving this markup, refresh your browser with the id query string parameter but without the cid parameter in the URL For example,
Initially the contact detail page is not rendered, but when you click a contact name the page renders the appropriate detail view.

If you use the id parameter in a URL, it must refer to the same entity referred to in the standard controller.

Note