Sending Ajax Request

RichFaces provides tag libraries which are capable to send Ajax request from JavaServer Faces pages. Following are the important tags used in the web application.

The <a4j:commandButton> and <a4j:commandLink> tags are used to send an Ajax request on the click JavaScript event.
The <a4j:poll> tag is used to send an Ajax request periodically using a timer.
The <a4j:ajax> tag allow is used to add Ajax functionality to standard JSF components and send Ajax request on a chosen JavaScript event, such as keyup or mouseover.
Most components in the r tag library have built-in Ajax support.

The <a4j:commandButton> Tag

to implement this tag we need to create the following files.

// index.xhtml

 <!DOCTYPE html> <ui:composition xmlns=”http://www.w3.org/1999/xhtml” xmlns:h=”http://java.sun.com/jsf/html” xmlns:f=”http://java.sun.com/jsf/core” xmlns:ui=”http://java.sun.com/jsf/facelets” xmlns:a4j=”http://richfaces.org/a4j” xmlns:rich=”http://richfaces.org/rich”> <h:form id=”form”> <h:outputText value=”User Name ” /> <h:inputText value=”#{user.name}” /> <a4j:commandButton value=”Enter Your Name” render=”out” execute=”@form” /> </h:form> <br/> <a4j:outputPanel> <h:outputText value=”Hello #{user.name} !” rendered=”#{not empty user.name}” /> </a4j:outputPanel>  </ui:composition> 

// User.java

 import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class User { String name; public String getName() { return name; } public void setName(String name) { this.name = name; } } 

// web.xml

 <?xml version=”1.0″ encoding=”UTF-8″?> <web-app version=”3.1″ xmlns=”http://xmlns.jcp.org/xml/ns/javaee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd”> <context-param> <param-name>javax.faces.PROJECT_STAGE</param-name> <param-value>Development</param-value> </context-param>   <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>faces/index.xhtml</welcome-file> </welcome-file-list> </web-app> 

After running index.xhtml file, it produces the following output.

CommandLink Tag

// commandLink.xhtml

 <ui:composition xmlns=”http://www.w3.org/1999/xhtml” xmlns:h=”http://java.sun.com/jsf/html” xmlns:f=”http://java.sun.com/jsf/core” xmlns:ui=”http://java.sun.com/jsf/facelets” xmlns:a4j=”http://richfaces.org/a4j” xmlns:rich=”http://richfaces.org/rich”> <h:head></h:head> <h:form id=”form”> <h:outputText value=”Name: ” /> <h:inputText value=”#{user.name}” /> <a4j:commandLink value=”Click here” render=”out” execute=”@form” /> </h:form> <br /> <a4j:outputPanel id=”out”> <h:outputText value=”Hello #{user.name} !” /> </a4j:outputPanel> </ui:composition> 

// User.java

 import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class User { String name; public String getName() { return name; } public void setName(String name) { this.name = name; } } 

// web.xml

 <?xml version=”1.0″ encoding=”UTF-8″?> <web-app version=”3.1″ xmlns=”http://xmlns.jcp.org/xml/ns/javaee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd”> <context-param> <param-name>javax.faces.PROJECT_STAGE</param-name> <param-value>Development</param-value> </context-param>  <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>faces/index.xhtml</welcome-file> </welcome-file-list> </web-app> 

Output:

<a4j:ajax> Tag

//ajax-event.xhtml

 <html xmlns=”http://www.w3.org/1999/xhtml” xmlns:h=”http://xmlns.jcp.org/jsf/html” xmlns:a4j=”http://richfaces.org/a4j”> <h:head> <title>a4j:ajax Tag</title> </h:head> <h:body> <h:form> <h:outputText value=”Enter Text “></h:outputText> <h:inputText value=”#{user.name}”> <a4j:ajax event=”keyup” render=”user-name”></a4j:ajax> </h:inputText> <br/> <br/> <h:outputText id=”user-name” value=” #{user.name}”></h:outputText> </h:form> </h:body> </html> 

// web.xml

 <?xml version=”1.0″ encoding=”UTF-8″?> <web-app version=”3.1″ xmlns=”http://xmlns.jcp.org/xml/ns/javaee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd”> <context-param> <param-name>javax.faces.PROJECT_STAGE</param-name> <param-value>Development</param-value> </context-param>  <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>faces/index.xhtml</welcome-file> </welcome-file-list> </web-app> 

// User.java

 import javax.faces.bean.ManagedBean; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class User { String name; public String getName() { return name; } public void setName(String name) { this.name = name; } } 

Output:

Next TopicRichFaces Partial Tree Processing

RichFaces Sending Ajax Request

Sending Ajax Request

The <a4j:commandButton> Tag

CommandLink Tag

<a4j:ajax> Tag

Verbal Reasoning | Assertion and Reason 1

Components of Robot

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