RichFaces Partial View Updates

by Online Tutorials Library July 14, 2022

Partial view updates

We can use the render attribute to specify which components to render for an Ajax update. The render attribute can point to an id identifier of a specific component to update. Components can also be identified through the use of Expression Language (EL).

The render attribute accepts the following keywords:

Keyword	Function
@all	It is used to update every component.
@none	It is used for no components are updated.
@this	It is used for requesting component with the execute attribute is updated.
@form	It is used to update the form that contains the requested component.
@region	The region that contains the requesting component is updated. Use the <a4j:region> component as a wrapper element to specify regions.

We should use the <a4j:outputPanel> component by setting ajaxRendered=”true”.

The <rich:message> and <rich:messages> components are based on the <a4j:outputPanel> component and as such will also always be updated. To override this behavior, use the limitRender=”true” setting on the requesting component.

// index.xhtml

  <?xml version=’1.0′ encoding=’UTF-8′ ?>  <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN””http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>  <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>Partial View Update</title>  </h:head>  <h:body>  <h:form>  <h:outputText value=”Enter Text “></h:outputText>  <h:inputText id=”name1″ value=”#{user.name}”>  <a4j:ajax event=”keyup” render=”name2″></a4j:ajax>  </h:inputText>  </h:form>  <br/>  <br/>  <a4j:outputPanel ajaxRendered=”true”>  <h:outputText value=”#{user.name}”></h:outputText>  </a4j:outputPanel>  </h:body>  </html>  

// 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:

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RichFaces Partial View Updates

Partial view updates

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