Interview Questions and Answers

Use a4j:actionListener to register an ActionListener class on a parent action component. Multiple listener methods can be registered on an action components in this way.

The a4j:actionListener tag differs from the standard JSF tag in that it allows the listener to be attached in any of three ways:

1. By listener method, using the listener attribute.
2. By listener class, using the type attribute.
3. By object binding, using the binding attribute.

The a4j:jsFunction component creates a JavaScript function that allows you to send JSF Ajax requests from any JavaScript. You define the Ajax and JSF properties just like a4j:ajax, or a4j:commandButton, and a4j:jsFunction creates the JavaScript for you. The component sends a request using the standard JSF mechanisms. Note that this means a JSF form is required.

The following example shows how to use a4j:jsFunction to create a function named updateName. This is then called on mouseover of the different names. This triggers the full round trip Ajax request and renders the updated name.

<span onmouseover="updateAddress('WithoutBook')" onmouseout="updateAddress('')">WithoutBook</span>

The rich:tree component renders a tree control on the page. The most important tree features include the following:

• Native support for Ajax operations
• Support for ajax, client, and server switch types
• Selection capabilities
• Flexible look and feel