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RichFaces Interview Questions and Answers

Intermediate / 1 to 5 years experienced level questions & answers

Ques 1. How to pass parameters to a4j:commandButton?

See the example to pass parameters to a4j command button:

<a4j:commandButton ajaxSingle="true" value="Update" reRender="name, job,
            out"  status="commonstatus">
            <a4j:actionparam name="n" value="Mark Joe"  assignTo="#{userBean.name}" />
            <a4j:actionparam name="j" value="WithoutBook"  assignTo="#{userBean.job}" />
</a4j:commandButton>
a4j:actionparam is the name by which you can get the value in your Handler/Bean.

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Ques 2. How to send and ajax request?

There are different ways to send Ajax requests from your JSF page. For example you can use <a4j:commandButton>  ,  <a4j:commandLink> ,  <a4j:poll>   or  <a4j:support>  tags or any other.
All these tags hide the usual JavaScript activities that are required for an  XMHTTPRequest object building and an Ajax request sending. Also, they allow you to decide which components of your JSF page are to be re-rendered as a result of the Ajax response (you can list the IDs of these components in the  "reRender"  attribute).

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Ques 3. How to upload files in richfaces?

Using rich:fileUplaod.

rich:fileUpload is a component which provides files upload functionality and extends functionality of standard input with type=file.
We can have different characteristics with this component like: allowed file types, maximum files quantity, and immediate upload.
It supports immediate upload as soon as a file is selected with this component.
<rich:fileUpload  id="fileUploadId"
 autoclear="true"
 uploadListClass="uploadList"
 fileEntryClass="fileEntry"
 allowFlash="auto"
 styleClass="richFileUpload"
 fileUploadListener="#{handler.documentUpload}"
 maxFilesQuantity="#{constants.FILE_UPLOADLIMIT}"
 required="true"
 immediate="true"
 listHeight="1px"
 listWidth="71px"
 onupload="onFileUploadClick();"
 addControlLabel="#{constants.Label_Browse}"
 immediateUpload="true"
 noDuplicate="true"
 onadd="addFileListener(event)">
<a4j:support event="onuploadcomplete" immediate="true" reRender="hiddenVal,docTableId,uploadErrorGrid,docSelectedMsgID,exceptionMessageGrid"/>
</rich:fileUpload>

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Ques 4. What is a4j:param in RichFaces?

The a4j:param component extends the regular f:param tag. The primary extension is the ability to assign a value to a property on a managed bean directly using the assignTo attribute. Using this feature you can update model values without invoking a single line code.

<a4j:commandButton value="Update Name" render="rep">
    <a4j:param value="WithoutBook" assignTo="#{bean.name}" />
</a4j:commandButton>

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Ques 5. What is a4j:status in RichFaces?

The a4j:status component is an indicator of an Ajax request. It has two states: start and stop. The start state indicates that an Ajax request is in progress. When an Ajax Response is returned, the component switches to the stop state. Give a loading progress on a ajax call:


<rich:modalPanel id="statusModalPanelId" autosized="true" resizeable="false">

        <h:graphicImage  value="/views/images/loading.gif"/>

        <a4j:status id="statusId" onstop="Richfaces.hideModalPanel('statusModalPanelId');">

                <f:facet name="start"></f:facet>

        </a4j:status>

 </rich:modalPanel>

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Ques 6. What is rich:messages in RichFaces?

rich:messages is an extension for a standard h:messages component. In addition to what the standard component provides, rich:messages:


<rich:messages ajaxRendered="true" />

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Ques 7. What is rich:dataGrid in RichFaces?

The rich:dataGrid component accepts the same data sources as other iteration components and renders them in a grid format, the same way as the h:PanelGrid component does for in-line data. To define the grid's properties and styles, use the same definitions as for the h:panelGrid component.


<rich:dataGrid value="#{bean.allEmployees}" var="emp" columns="3" elements="9" width="600px" border="0">
      <rich:panel bodyClass="pbody">
       <f:facet name="header">
               <h:outputText value="#{emp.name} #{emp.code}"></h:outputText>
          </f:facet>
          <h:panelGrid columns="2">
               <h:outputText value="Salary:" styleClass="label"></h:outputText>
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Ques 8. What is rich:calendar in RichFaces?

The rich:calendar component allows you to select a date using a monthly calendar widget. It is possible to use the component in a popup or inline mode. In popup mode the calendar is initially rendered as an input for date with a button on the right side to trigger the popup. For inline mode, the monthly calendar is rendered on the page initially.


<rich:calendar value="#{calendarBean.dateSelected}" id="calendar" locale="#{calendarBean.locale}" popup="#{calendarBean.popup}" datePattern="#{calendarBean.pattern}" showApplyButton="#{calendarBean.showApply}" cellWidth="24px" cellHeight="22px" style="width:200px" disabled="#{calendarBean.disabled}">
</rich:calendar>

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