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Experienced / Expert level questions & answers

Ques 1

What is <a4j:support> tag?

Sends an AJAX request based on a DHTML event supported by the parent component.  In this example, the AJAX request will  be triggered after the user types a character in the text box:
<h:inputText value="#{document.docOrigtor}" id="docClaimOrigId" binding="#{handler.docOrig}">
  <a4j:support actionListener="#{handler.createDocumentName}" event="onkeyup" reRender="docId"/>
</h:inputText>
Here, on keyup event it will call handler.createDocumentName method with ajax call and rendering docId value.
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Ques 2

How to control traffic in RichFaces?

Controlling traffic can be done using Queues mechanism.
Queues can be defined using <a4j:queue…../>
3 types of queues are there: Named, Unnamed, and Global queue.
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Ques 4

How to different skins are runtime?

We can define an applications skin with EL expression like this:
Deine a session scoped skinBean and manage its currentSkin  property at runtime with your skin names values.  Every time a page is rendered, RichFaces will resolve the value in #{skinBean.currentSkin} to get the current skin.  Changing Skins should not be done via AJAX but with a full page refresh. A full page refresh will ensure that all CSS links are correctly updated based on the new skin.
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Ques 5

Tell me about a4j:outputPanel and ajaxRendered?

"ajaxRendered"  attribute of the  <a4j:outputPanel>  set to "true" allows to define the area of the page that will be re-rendered even if it is not pointed in the reRender attribute explicitly. It might be useful if you have an area on a page that should be updated as a response on any Ajax request.
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Ques 6

What is limitToList attribute?

"limitToList"  attribute allows to dismiss the behavior of the  <a4j:outputPanel>   "ajaxRendered" attribute.
limitToList = "true" means to update only the area(s) that mentioned in the "reRender"  attribute explicitly. All output panels with ajaxRendered="true" is ignored.
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Ques 7

What is the use of eventsQueue?

Attribute "eventsQueue" defines the name of the queue that will be used to order upcoming Ajax requests. By default, RichFaces does not queue Ajax requests. If events are produced simultaneously, they will come to the server simultaneously. JSF implementations (especially, the very first ones) does not guaranty that the request that comes first will be served or passed into the JSF lifecycle first. The order how the server-side data will be modified in case of simultaneous request might be unpredictable. Usage of eventsQueue attribute allows to avoid possible mess.
The next request posted in the same queue will wait until the previos one is not processed and Ajax Response is returned back if the  "eventsQueue"  attribute is defined.
In addition, RichFaces starts to remove from the queue "similar" requests. "Similar'"requests are the requests produced by the same event.
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Ques 8

How to handle request errors and session expire on client side?

Given an example below:
A4J.AJAX.onError = function(req, status, message){
    window.alert("Custom onError handler "+message);
}
A4J.AJAX.onExpired = function(loc, expiredMsg){
if(window.confirm("Custom onExpired handler "+expiredMsg+" for a location: "+loc)){
      return loc;
    } else {
     return false;
    }
}
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Ques 9

What is a4j:ajax?

a4j:ajax is one of our core behaviors, extending the base JSF 2.0 f:ajax tag. This tag triggers an Ajax request when the specified parent event is triggered.
<h:inputText value="#{userBean.name}">
    <a4j:ajax event="keyup" render="out" />
</h:inputText>
<h:outputText value="#{userBean.name}" id="out" />
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Ques 10

What is a4j:actionListener in RichFaces?

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.
<h:commandButton value="Update">
    <a4j:actionListener listener="#{bean.actionMethod}"/>
    <f:ajax render="messages"/>
</h:commandButton>
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Ques 11

What is a4j:jsFunction in RichFaces?

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>

<a4j:jsFunction name="updateAddress" render="showAddress">
    <a4j:param name="address" assignTo="#{bean.address}" />
</a4j:jsFunction>
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Ques 12

What is rich:tree in RichFaces?

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
<rich:tree id="tree" nodeType="#{node.type}" var="node" value="#{bean.rootNodes}" toggleType="client" selectionType="ajax" selectionChangeListener="#{bean.selectionChanged}">
      <rich:treeNode type="country">#{node.name}</rich:treeNode>
      <rich:treeNode type="company" iconExpanded="/images/ctry.gif" iconCollapsed="/images/tree/disc.gif">#{node.name}</rich:treeNode>
      <rich:treeNode type="cd" iconLeaf="/images/tree/cd.gif">
           #{node.artist} - #{node.name} - #{node.year}
</rich:treeNode>
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