Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is RichFaces?
RichFaces is a JSF component library that consists of two main parts:
- A full set of AJAX enabled components in two libraries
- a4j: page centric AJAX controls
- rich: self contained, ready to use components
- Client-side validation, expanding JSR 303 Bean Validation all the way to the browser.
- Advanced queueing to match the high performance requirements of real world enterprise applications.
- Push component upgrades including JavaMessaging Service (JMS) integrations, and various transport mechanisms based on browser support.
- Our own Component Development Kit (CDK).
- Comprehensive documentation covering development best practices, and component details.
- Detailed and automated testing facilities for components, actions, listeners, and pages.
- Broad cross-browser support
- Large and active community at its foundation!!
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Ques 2. What are the basic configurations of web.xml for Rich Faces?
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Ques 3. Give some examples of RichFaces Components.
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Ques 4. Give some examples of a4j components.
Some examples of a4j components:
- <a4j:commandLink>
- <a4j:commandButton>
- <a4j:outputPanel>
- <a4j:region>
- <a4j:mediaOutput>
- <a4j:queue>
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Ques 5. What is a4j:commandLink in RichFaces?
The a4j:commandLink combines the standard h:commandLink with our own a4j:ajax. This not only reduces typing, but also inherits all a4j:ajax special options.
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Ques 6. 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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Intermediate / 1 to 5 years experienced level questions & answers
Ques 7. How to pass parameters to a4j:commandButton?
See the example to pass parameters to a4j command button:
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Ques 8. How to send and ajax request?
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Ques 9. How to upload files in richfaces?
Using rich:fileUplaod.
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Ques 10. What is a4j:param in RichFaces?
<a4j:commandButton value="Update Name" render="rep"> <a4j:param value="WithoutBook" assignTo="#{bean.name}" /></a4j:commandButton>保存以便复习
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Ques 11. 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 12. 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" />保存以便复习
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Ques 13. 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>保存以便复习
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打开我的学习资料库Ques 14. 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>保存以便复习
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Experienced / Expert level questions & answers
Ques 15. What is <a4j:support> tag?
Sends an
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Ques 16. How to control traffic in RichFaces?
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Ques 17. How to keep a managed bean between requests?
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Ques 18. How to different skins are runtime?
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Ques 19. 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
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Ques 20. What is limitToList attribute?
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Ques 21. What is the use of eventsQueue?
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Ques 22. How to handle request errors and session expire on client side?
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Ques 23. 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" />保存以便复习
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Ques 24. 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:
- By listener method, using the listener attribute.
- By listener class, using the type attribute.
- By object binding, using the binding attribute.
<h:commandButton value="Update"> <a4j:actionListener listener="#{bean.actionMethod}"/> <f:ajax render="messages"/></h:commandButton>保存以便复习
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Ques 25. 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>保存以便复习
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Ques 26. 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>保存以便复习
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打开我的学习资料库
Most helpful rated by users:
- What is RichFaces?
- What is rich:dataGrid in RichFaces?
- What are the basic configurations of web.xml for Rich Faces?
- What is limitToList attribute?
- What is rich:messages in RichFaces?