如何以编程方式添加AjaxBehavior与primefaces在UIComponent [英] How to programmatically add an AjaxBehavior to a UIComponent with primefaces

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本文介绍了如何以编程方式添加AjaxBehavior与primefaces在UIComponent的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

由于我问<一href="http://stackoverflow.com/questions/15769371/a-programmatically-added-ajaxbehaviour-into-a-commandlink-doesnt-work">my最后一个问题（仍然没有答案）我继续寻找解决的办法，最后我发现的这个话题，我认为可以帮助实现我想要什么。

所以，我想，解决方案（这本身就是一个解决方法），但它仍然没有为我工作。

下面是code，这一切都只是一个测试针对此问题：

中的index.xhtml：

 ＆LT; XML版本=1.0编码=ISO-8859-1＆GT？;
＆LT;！DOCTYPE HTML＆GT;
＆LT; HTML的xmlns =htt​​p://www.w3.org/1999/xhtml
    的xmlns：H =htt​​p://java.sun.com/jsf/html
    的xmlns：F =htt​​p://java.sun.com/jsf/core
    的xmlns：P =htt​​p://primefaces.org/ui
    的xmlns：UI =htt​​p://java.sun.com/jsf/facelets
    的xmlns：C =htt​​p://java.sun.com/jsp/jstl/core＆GT;

＆LT; H：头＆GT;
＆LT; META HTTP-当量=Content-Type的CONTENT =text / html的;字符集= ISO-8859-1/＆GT;
＆LT;冠军＆GT;达因添加谱曲测试＆LT; /标题＆GT;
＆LT; / H：头＆GT;
＆LT;身体GT;
＆LT; H：表格ID =Form1的＆GT;
＆LT;！ - 这一次，第一次commandLink是clisked它会产生它下面另一个commandlink  - ＆GT;
＆LT; H：commandLink值=cliick我＆GT;
＆LT; F：Ajax事件=点击监听器=＃{myBean.firstcmdLinkListenerHandler}/＆GT;
＆LT; / H：commandLink＆GT;

＆LT; /小时：形式GT;
＆LT; /身体GT;
＆LT; / HTML＆GT;

管理bean：MyBean.java 

 包mybeans;

进口javax.el.E​​x pressionFactory;
进口javax.el.MethodEx pression;
进口javax.faces.application.Application;
进口javax.faces.bean.ManagedBean;
进口javax.faces.bean.SessionScoped;
进口javax.faces.component.UIComponent;
进口javax.faces.component.html.HtmlCommandLink;
进口javax.faces.context.FacesContext;
进口javax.faces.event.AjaxBehaviorEvent;
进口javax.faces.event.BehaviorEvent;

进口org.primefaces.component.behavior.ajax.AjaxBehaviorListenerImpl;
进口org.primefaces.context.RequestContext;

@ManagedBean
@SessionScoped
公共类MyBean {


    公共无效handleClose（AjaxBehaviorEvent安倍晋三）{

        的System.out.println（!!!  - ＆GT;＆GT;＆GT;＆GT;＆GT;阿贾克斯行为作品!!!!!）;

    }


    公共无效reLoadCityList（BehaviorEvent事件）{
        的System.out.println（!!!  - ＆GT;＆GT;＆GT;＆GT;＆gt;在reLoadCityList方法效果!!!!!）;
    }


    公共无效firstcmdLinkListenerHandler（AjaxBehaviorEvent安倍晋三）{


        的System.out.println（firstcmdLinkListenerHandleris跑！）;

        FacesContext的FC = FacesContext.getCurrentInstance（）;
        应用程序= fc.getApplication（）;
        防爆pressionFactory EF = fc.getApplication（）GETEX pressionFactory（）。

        UIComponent Form1中= fc.getViewRoot（）findComponent（窗口1）。

        如果（Form1中！= NULL）{

       //创建commandLink
       HtmlCommandLink mynewcmdlink =（HtmlCommandLink）application.createComponent（HtmlCommandLink.COMPONENT_TYPE）;
       mynewcmdlink.setId（mynewcmdlink）;
       mynewcmdlink.setValue（clickme2 !!）;
       MyAjaxBehavior pajax =新MyAjaxBehavior（）;
       类[] =杆新类[1];


        票面​​[0] = BehaviorEvent.class;
        //票面[0] = AjaxBehaviorEvent.class; （*）
        //pajax.setListener（myCreateMetEx pression（reLoadCityList，真实，//void.class，PAR））;

        //我试图与这两个AjaxBehaviorEvent和BehaviorEvent如（*）
            // MethodEx pression我= ef.createMethodEx pression（//fc.getELContext（），＃{myBean.handleClose}，void.class，标准杆）;

         MethodEx pression我= ef.createMethodEx pression（fc.getELContext（），＃{myBean.reLoadCityList}，void.class，标准杆）;

         //pajax.setListener(me）; //我已经试过这一点，但它不是sucesseful
         pajax.addAjaxBehaviorListener（新AjaxBehaviorListenerImpl（我））;

            pajax.setProcess（@this）;
            mynewcmdlink.addClientBehavior（变，pajax）;

        //添加thecommanLink到窗体
        。form1.getChildren（）加（mynewcmdlink）;


        //刷新的形式看到添加的commandLink：
        RequestContext的背景下= RequestContext.getCurrentInstance（）;
            context.update（窗口1）;
            context.update（form1的：富）;

        }其他
            的System.out.println（form1的为空！）;

}

和用作primefaces论坛文章的变通方法MyAjaxBehavior.java：

 包mybeans;

进口的java.util.HashMap;

进口javax.el.E​​LContext;
进口javax.el.MethodEx pression;
进口javax.faces.component.UIComponentBase;
进口javax.faces.context.FacesContext;
进口javax.faces.event.AbortProcessingException;
进口javax.faces.event.BehaviorEvent;

进口org.primefaces.component.behavior.ajax.AjaxBehavior;

公共类MyAjaxBehavior扩展AjaxBehavior {

    @覆盖
    公共对象saveState和（FacesContext的上下文）{
        HashMap的＆LT;字符串，对象＆gt;地图;
        图=新的HashMap＆LT;字符串，对象＆gt;（）;
        map.put（更新，getUpdate（））;
        map.put（过程，getProcess（））;
        map.put（的onComplete，getOncomplete（））;
        map.put（的onerror，getOnerror（））;
        map.put（的onSuccess，getOnsuccess（））;
        map.put（的OnStart，getOnstart（））;
        map.put（监听器​​，getListener（））;

        如果（initialStateMarked（））
            返回null;
        返回UIComponentBase.saveAttachedState（背景下，地图）;

    }

    @燮pressWarnings（未登记）
    @覆盖
    公共无效restoreState（FacesContext的上下文，对象状态）{
        如果（状态！= NULL）{
            HashMap的＆LT;字符串，对象＆gt;地图;
            地图=（HashMap的＆LT;字符串，对象＆gt;）UIComponentBase
                    .restoreAttachedState（背景下，国家）;

            setUpdate（（字符串）map.get（更新））;
            setProcess（（字符串）map.get（过程））;
            setOncomplete（（字符串）map.get（的onComplete））;
            setOnerror（（字符串）map.get（onError的））;
            setOnsuccess（（字符串）map.get（的onSuccess））;
            setOnstart（（字符串）map.get（的OnStart））;
            使用setListener（（MethodEx pression）map.get（监听器​​））;
        }

    }

    @覆盖
    公共无效广播（BehaviorEvent事件）抛出AbortProcessingException {
        ELContext eLContext = FacesContext.getCurrentInstance（）getELContext（）。

        //向后兼容实现监听器调用
        如果（getListener（）！= NULL）{
            尝试 {
                。getListener（）调用（eLContext，新的对象[] {事件}）;
            }赶上（抛出：IllegalArgumentException例外）{
                。getListener（）调用（eLContext，新的对象[0]​​）;
            }
        }
    }

}

解决方案

做这样的事

 面板TP =新面板（）;
FacesContext的FC = FacesContext.getCurrentInstance（）;
防爆pressionFactory EF = fc.getApplication（）GETEX pressionFactory（）。

MethodEx pression我= ef.createMethodEx pression（fc.getELContext（），＃{myView.closeIt}，空，新的类＆LT;＆GT; [] {BehaviorEvent.class}）;
AjaxBehavior ajaxBehavior =（AjaxBehavior）fc.getApplication（）createBehavior（AjaxBehavior.BEHAVIOR_ID）。
ajaxBehavior.setProcess（@本）;
ajaxBehavior.addAjaxBehaviorListener（新AjaxBehaviorListenerImpl（我，我））;
tp.addClientBehavior（关闭，ajaxBehavior）;

。component.getChildren（）加（TP）;

myView.closeIt（）的 

 公共无效closeIt（CE的closeEvent）{
    面板P =（面板）ce.getComponent（）;
    的System.out.println（你什么都想要）;
}

Since i've asked my last question (which still unanswered) i continued searching for a solution and lastly i found this topic which i think can help achieve what i want.

So , i tried that solution (which itself is a workaround) but it still didn't work for me.

Here is the code, it s all just a test for this issue :

the index.xhtml :

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:c="http://java.sun.com/jsp/jstl/core">

<h:head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>dyn add comps test </title>
</h:head>
<body>
<h:form id="form1">
<!-- once this first commandLink is clisked it will generate another commandlink below it  -->
<h:commandLink value="cliick me">
<f:ajax event="click" listener="#{myBean.firstcmdLinkListenerHandler}"/>
</h:commandLink>

</h:form>
</body>
</html>

The managed Bean : MyBean.java

package mybeans;

import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.faces.application.Application;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.component.UIComponent;
import javax.faces.component.html.HtmlCommandLink;
import javax.faces.context.FacesContext;
import javax.faces.event.AjaxBehaviorEvent;
import javax.faces.event.BehaviorEvent;

import org.primefaces.component.behavior.ajax.AjaxBehaviorListenerImpl;
import org.primefaces.context.RequestContext;

@ManagedBean
@SessionScoped
public class MyBean {


    public void handleClose(AjaxBehaviorEvent abe){

        System.out.println("!!!-->>>>>  the Ajax Behaviour Works !!!!! ");

    }


    public void reLoadCityList( BehaviorEvent event ){
        System.out.println("!!!-->>>>>  the reLoadCityList method Works !!!!! ");
    }


    public void firstcmdLinkListenerHandler(AjaxBehaviorEvent abe){


        System.out.println("firstcmdLinkListenerHandleris running ! ");

        FacesContext fc = FacesContext.getCurrentInstance();
        Application application = fc.getApplication();
        ExpressionFactory ef = fc.getApplication().getExpressionFactory();      

        UIComponent form1 = fc.getViewRoot().findComponent("form1");

        if(form1!=null){

       //Creating the commandLink
       HtmlCommandLink mynewcmdlink = (HtmlCommandLink)application.createComponent(HtmlCommandLink.COMPONENT_TYPE);
       mynewcmdlink.setId("mynewcmdlink");
       mynewcmdlink.setValue("clickme2!!");
       MyAjaxBehavior pajax = new MyAjaxBehavior();
       Class[] par = new Class[1];


        par[0] = BehaviorEvent.class;
        //par[0] = AjaxBehaviorEvent.class; (*)
        //pajax.setListener( myCreateMetExpression( "reLoadCityList", true,   //void.class, par ) );

        //i tried with both AjaxBehaviorEvent and BehaviorEvent as in (*)
            //MethodExpression me = ef.createMethodExpression(                   //fc.getELContext(), "#{myBean.handleClose}", void.class, par);

         MethodExpression me = ef.createMethodExpression( fc.getELContext(), "#{myBean.reLoadCityList}", void.class, par);

         //pajax.setListener(me); //i've tried with this too but it wasn't sucesseful
         pajax.addAjaxBehaviorListener( new AjaxBehaviorListenerImpl( me ) );

            pajax.setProcess( "@this" );
            mynewcmdlink.addClientBehavior( "change", pajax );

        //adding thecommanLink to the form
        form1.getChildren().add(mynewcmdlink);


        //Refreshing the form to see the added commandLink :
        RequestContext context = RequestContext.getCurrentInstance();           
            context.update("form1");
            context.update("form1:foo"); 

        }else
            System.out.println("form1 is null!!");

}

and the MyAjaxBehavior.java used as the workaround in the primefaces forum article:

package mybeans;

import java.util.HashMap;

import javax.el.ELContext;
import javax.el.MethodExpression;
import javax.faces.component.UIComponentBase;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.BehaviorEvent;

import org.primefaces.component.behavior.ajax.AjaxBehavior;

public class MyAjaxBehavior extends AjaxBehavior {

    @Override
    public Object saveState(FacesContext context) {
        HashMap<String, Object> map;
        map = new HashMap<String, Object>();
        map.put("update", getUpdate());
        map.put("process", getProcess());
        map.put("oncomplete", getOncomplete());
        map.put("onerror", getOnerror());
        map.put("onsuccess", getOnsuccess());
        map.put("onstart", getOnstart());
        map.put("listener", getListener());

        if (initialStateMarked())
            return null;
        return UIComponentBase.saveAttachedState(context, map);

    }

    @SuppressWarnings("unchecked")
    @Override
    public void restoreState(FacesContext context, Object state) {
        if (state != null) {
            HashMap<String, Object> map;
            map = (HashMap<String, Object>) UIComponentBase
                    .restoreAttachedState(context, state);

            setUpdate((String) map.get("update"));
            setProcess((String) map.get("process"));
            setOncomplete((String) map.get("oncomplete"));
            setOnerror((String) map.get("onerror"));
            setOnsuccess((String) map.get("onsuccess"));
            setOnstart((String) map.get("onstart"));
            setListener((MethodExpression) map.get("listener"));
        }

    }

    @Override
    public void broadcast(BehaviorEvent event) throws AbortProcessingException {
        ELContext eLContext = FacesContext.getCurrentInstance().getELContext();

        // Backward compatible implementation of listener invocation
        if (getListener() != null) {
            try {
                getListener().invoke(eLContext, new Object[] { event });
            } catch (IllegalArgumentException exception) {
                getListener().invoke(eLContext, new Object[0]);
            }
        }
    }

}

解决方案

Do something like this

Panel tp = new Panel();
FacesContext fc = FacesContext.getCurrentInstance();
ExpressionFactory ef = fc.getApplication().getExpressionFactory();

MethodExpression me = ef.createMethodExpression(fc.getELContext(), "#{myView.closeIt}", null, new Class<?>[]{BehaviorEvent.class});
AjaxBehavior ajaxBehavior = (AjaxBehavior) fc.getApplication().createBehavior(AjaxBehavior.BEHAVIOR_ID);
ajaxBehavior.setProcess("@this");
ajaxBehavior.addAjaxBehaviorListener(new AjaxBehaviorListenerImpl(me, me));
tp.addClientBehavior("close", ajaxBehavior);

component.getChildren().add(tp);

myView.closeIt()

public void closeIt(CloseEvent ce){
    Panel p = (Panel) ce.getComponent();
    System.out.println("Do what ever you want");
}

这篇关于如何以编程方式添加AjaxBehavior与primefaces在UIComponent的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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