JSF 2 template partial update [duplicate]

问题

I have the following JSF 2 template Page with primefaces menu, I want to partially update the cenral centent of the page onclick of links from left Menu, I don't want to update the entire page.I have gone throu the posts in stackoverflow, they are suggetign that I should have a form name in the central_body_div, but I don't want to sepcify a form in the central_body_div, as the dynamically loaded page will have form with it's own name, I should be able to submit the form in the page appearing dynamically in central_body_div div.

First of all the Layout page itself not loading , giving the below exception.

Cannot find component with identifier "central_body_div" referenced from "leftMenuFormId:menuItem1".

Experts can you give a solution for this problem. would apprecite your replies.

<?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:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui">

    <f:view contentType="text/html">

        <h:head>
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
            <h:outputStylesheet name="cssLayout.css" library="css" />
            <h:outputStylesheet name="default.css" library="css" />        
            <title> Lightweight Mediation - Secure Pages </title>
        </h:head>

        <h:body id="securebody">

            <div id="top">
                <ui:insert name="top">
                    <ui:include src="/secure/home/header.xhtml" />
                </ui:insert>
            </div>
            <div id="content_holder">
                <div id="left">
                    <ui:insert name="left">
                        <ui:include src="/secure/home/leftMenu.xhtml" />
                    </ui:insert>
                </div>
                <div id="central_body_div" class="left_content">
                    <ui:insert name="content">Content</ui:insert>
                </div>
            </div>
            <div id="bottom">
                <ui:insert name="bottom">
                    <ui:include src="/secure/home/footer.xhtml" />
                </ui:insert>
            </div>

        </h:body>
    </f:view>
</html>

My leftMenu.xhtml content is below

<?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:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core">

    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:composition id="leftMenuCompositionId"> 
            <h:form id="leftMenuFormId">
                <p:menu id="lMenuId">
                    <p:menuitem id="menuItem1" value="page1" action="page1" update="central_body_div" partialSubmit="true"/>
                    <p:menuitem id="menuItem2" value="page2"  action="page2" update="central_body_div" partialSubmit="true" />
                </p:menu>
            </h:form>
        </ui:composition>
    </h:body>
</html>

回答1:

Change your code with following and try again,

leftMenu.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:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:p="http://primefaces.org/ui"
  xmlns:f="http://java.sun.com/jsf/core">

<h:head>
    <title>Facelet Title</title>
</h:head>
<h:body>
    <ui:composition id="leftMenuCompositionId"> 
        <h:form id="leftMenuFormId">
            <p:menu id="lMenuId">
                <p:menuitem id="menuItem1" value="page1" action="page1" update=":form1:central_body_div" partialSubmit="true"/>
                <p:menuitem id="menuItem2" value="page2"  action="page2" update=":form1:central_body_div" partialSubmit="true" />
            </p:menu>
        </h:form>
    </ui:composition>
</h:body>

and your template xhtml with,

<?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:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core">

<f:view contentType="text/html">

    <h:head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <h:outputStylesheet name="cssLayout.css" library="css" />
        <h:outputStylesheet name="default.css" library="css" />        
        <title> Lightweight Mediation - Secure Pages </title>
    </h:head>

    <h:body id="securebody">

        <div id="top">

        </div>
        <div id="content_holder">
            <div id="left">
                <ui:insert name="left">
                    <ui:include src="leftMenu.xhtml" />                        
                </ui:insert>
            </div>
            <h:form id="form1" >
                <h:panelGroup id="central_body_div">
                    <script type="text/javascript">alert('Content Updated')</script>
                    <ui:insert name="content">Content</ui:insert>
                </h:panelGroup>
            </h:form>
        </div>
        <div id="bottom">

        </div>

    </h:body>
</f:view>

It's checked and working.

回答2:

Warning! View build time vs view render time problem ahead!

The usual mistake here is performing navigation, or as you say, refreshing a central holder with <ui:insert>/<ui:define>, which is a view build tag, not a view render UI component. So it simply won't be recalculated on AJAX requests, as your component tree will be restored from view state, and will not be built afresh.

So, just don't do that mistake, by making AJAX navigation, which is defective in many ways (SEO, non-bookmarkability, not user friendliness, etc.) and perform navigation by the components designed for that, like <h:link>, or <p:menuItem> that's generating plain get as.

As per your comment you don't fully distinguish between navigation links and command links. The former are used to perform navigation only and generate bookmarkable a elements, while the latter are used to (partially) submit the form, do business job, and (partially) update the view, or perform navigation.

What you need to do is simply to distinguish between those cases. For navigation use <h:link>/<p:menuitem outcome="/your-view-id">, for POST actions, use <p:commandButton>/<p:menuitem action(listener)="#{bean.action(listener)}" instead.

In this case the templating structure doesn't matter as long as you don't expect tag handlers to be refreshed on AJAX requests.

回答3:

I have placed the solution I arrived from the discussion in this post and reference from other posts. the page we are including can have different form names.

template.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:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:p="http://primefaces.org/ui">

    <f:view contentType="text/html">

        <h:head>
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
            <h:outputStylesheet name="cssLayout.css" library="css" />
            <h:outputStylesheet name="default.css" library="css" />        
            <title> Lightweight Mediation - Secure Pages </title>
        </h:head>

        <h:body id="securebody">

            <div id="top">
                <ui:insert name="top">
                    <ui:include src="header.xhtml" />
                </ui:insert>
            </div>

            <div id="content_holder">        
                <div id="left">
                    <ui:insert name="left">
                        <ui:include src="leftMenu.xhtml" />                        
                    </ui:insert>
                </div>
                <div id="center" class="left_content">
                    <h:panelGroup id="central_body_div">
                        <ui:include src="#{templateBean.page}.xhtml" />
                    </h:panelGroup>
                </div>       
            </div>

            <div id="bottom">
                <ui:insert name="bottom">
                    <ui:include src="footer.xhtml" />
                </ui:insert>
            </div>

        </h:body>
    </f:view>
</html>

leftMenu.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:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core">

    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:composition id="leftMenuCompositionId">    

            <h:form id="leftMenuFormId">
                <f:ajax render=":central_body_div">
                    <h:commandLink value="page1" action="#{templateBean.setPage('page1')}" /><br></br>
                    <h:commandLink value="page2" action="#{templateBean.setPage('page2')}" />
                </f:ajax>
            </h:form>

        </ui:composition>
    </h:body>
</html>

Page 1

<?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:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core"
      >
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:composition>              
            <h1>Page One</h1>
        </ui:composition>
    </h:body>
</html>

Page 2

<?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:ui="http://java.sun.com/jsf/facelets"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:p="http://primefaces.org/ui"
      xmlns:f="http://java.sun.com/jsf/core"
      >
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <ui:composition >  
            <h:form id="form1" >
                <h1>Page Two</h1>
            </h:form>
        </ui:composition>
    </h:body>
</html>



package ae.co.gui.beans;

import javax.inject.Named;
import javax.enterprise.context.SessionScoped;
import java.io.Serializable;
import javax.annotation.PostConstruct;
import javax.faces.event.ActionEvent;

@Named(value = "templateBean")
@SessionScoped
public class TemplateBean implements Serializable {

    private String page;

    public TemplateBean() {
    }

    @PostConstruct
    public void init() {
        this.page = "page1"; // Ensure that default is been set.
    }

    public String getPage() {
        return page;
    }

    public void setPage(String page) {
        this.page = page;
    }

}

回答4:

Late to the party... fixing an application for a client currently and face this issue. Didn't like the idea of adding a form. They use primefaces, not sure if this is only unique to them but <p:commandButton ... update="@(:central_body_div)"/> fixed the problem in my case.

来源：https://stackoverflow.com/questions/16381447/jsf-2-template-partial-update

标签

templates

jsf-2

primefaces

updates

partial