In this topic, we will discuss the Partial view updates in RichFaces.
We can use the rendered 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 to be updated. |
| @this | It is used for requesting components 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;
}
}
In this topic, we will learned about the Partial view updates in RichFaces. To know more Click Here.
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