RichFaces 면접 질문과 답변
Ques 21. 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>
Ques 22. 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" />Ques 23. 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 24. 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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Ques 25. What is rich:tooltip in RichFaces?
The rich:tooltip component creates a small non-modal pop-up that can be used to display additional information for nearly anything on the page.
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