从p：commandButton更新不起作用

Question

I search for someone who can help me out with this "small" problem, I searched for hours. 我搜寻了可以帮助我解决这个“小”问题的人，我搜寻了几个小时。 The code below is "broken down", so the real application is huge, I can't move technology at the moment. 下面的代码“已分解”，因此实际应用程序非常庞大，目前我无法转移技术。

So I have primefaces 5.0.10 and MyFaces 2.0.3 and I have to deal with that. 所以我有素数5.0.10和MyFaces 2.0.3，我必须处理。

Here's an XHTML: 这是一个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:p="http://primefaces.org/ui"
xmlns:ui="http://java.sun.com/jsf/facelets"
template="../index.xhtml">
<ui:define name="title">Keyboard Bean Test</ui:define>

<ui:define name="content">
    <h1>Keyboard Bean Test</h1>

    <h:form id="myform">
        <p:panel header="KeyboardBean">
            <p:keyboard value="#{keyboardBean.value}"></p:keyboard>
        </p:panel>

        <h:outputText id="myOutput" value="#{keyboardBean.value}"></h:outputText> <br /><br />

        <p:commandButton value="Setzen" update="myOutput"></p:commandButton>
    </h:form>
</ui:define>

And here's my KeyboardBean.java 这是我的KeyboardBean.java

package de.lippoliv.test.primefaces.beans;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.event.ActionEvent;
import javax.inject.Named;

@Named("keyboardBean")
@ManagedBean
@SessionScoped
public class KeyboardBean {

    private String value;

    public String getValue () {
        System.out.println("KeyboardBean::reading value: " + value);

        return value;
    }

    public void setValue (String newValue) {
        System.out.println("KeyboardBean::write value: " + newValue);

        value = newValue;
    }

}

What I would like to to: Update the outputText on pressing the commandButton. 我要执行的操作：按下commandButton时更新outputText。 QUIET SO SIMPLE! 非常安静！

In the real application the use-case is different, but for start figuring out why it doesn't work in real application, I decided to break it down to this simple think and then make it (step by step) more like the real application. 在实际的应用程序中，用例是不同的，但是为了弄清楚为什么它在实际的应用程序中不起作用，我决定将其分解为这种简单的想法，然后逐步使其变得更像实际的应用程序。

Whatever: This doesn't work. 不管：这行不通。 The outputText just refresh after page-load. 页面加载后，outputText才刷新。 I tryed a lot till now, nothing worked. 到目前为止，我已经尝试了很多，但没有任何效果。 Just switching from MyFaces to original JSF, but that is (as I wrote) not possible for me at the moment. 只是从MyFaces切换到原始JSF，但是（如我所写的那样）目前对我而言是不可能的。

Hopefully someone can help me out here. 希望有人可以在这里帮助我。

update 1 更新1

Here's the Ouput of console: 这是控制台的输出：

26.02.2016 11:58:58 org.apache.myfaces.config.annotation.Tomcat7AnnotationLifecycleProvider newInstance
INFO: Creating instance of de.rac.oliverlippert.test.primefaces.beans.MenuBean
26.02.2016 11:58:58 org.apache.myfaces.config.annotation.Tomcat7AnnotationLifecycleProvider newInstance
INFO: Creating instance of de.rac.oliverlippert.test.primefaces.beans.KeyboardBean
KeyboardBean::reading value: null
KeyboardBean::reading value: null
KeyboardBean::reading value: null
KeyboardBean::reading value: null
26.02.2016 11:59:01 org.apache.myfaces.config.annotation.Tomcat7AnnotationLifecycleProvider newInstance
INFO: Creating instance of de.rac.oliverlippert.test.primefaces.beans.KeyboardBean
26.02.2016 11:59:01 javax.faces.validator._ExternalSpecifications isUnifiedELAvailable
INFO: MyFaces Unified EL support enabled
KeyboardBean::reading value: null
KeyboardBean::write value: sdf

Very interessting: After pressing the commandButton once, the Beans will not be called again... 非常有趣：一次按下commandButton之后，将不会再次调用Beans。

Also I modifyed my bean, it now starts with 我也修改了我的bean，它现在开始于

@ManagedBean
@SessionScoped
public class KeyboardBean {
    ...
}

AND also I modifyed my "update" to use the whole id: 并且我还修改了“更新”以使用整个ID：

<p:commandButton value="Setzen" update=":myform:myOutput"></p:commandButton>

All that doesn't change a thing :/ 一切都不会改变：/

FireFox throws one JS error on pressing the button: FireFox在按下按钮时引发一个JS错误：

TypeError: f is null (javax.faces.resource/primefaces.js.xhtml?ln=primfaces&v=5.0 row 2 col 6868)

Thanks for any reply 感谢您的回复

update 2 OK breaking it down to this XHTML, it work: 更新2可以将其分解为这个XHTML，它可以工作：

<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"
>

<h:head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title>Primefaces Test</title>
</h:head>

<h:body>
    <h1>Keyboard Bean Test</h1>

    <h:form id="myform">
        <h:panelGrid id="grid" cellpadding="5" columns="2" style="margin-bottom:10px">
            <p:panel header="KeyboardBean">
                <p:keyboard value="#{keyboardBean.value}"></p:keyboard>
            </p:panel>
            <h:outputText id="myOutput" styleClass="update" value="#{keyboardBean.value}"></h:outputText>

            <h:outputText id="myOutput2" styleClass="update" value="#{keyboardBean.value}"></h:outputText>
            <h:outputText id="myOutput3" styleClass="update" value="#{keyboardBean.value}"></h:outputText>
        </h:panelGrid>

        <p:commandButton value="Setzen" update="@(.update)"></p:commandButton>
    </h:form>
</h:body>

Now I can move forward step by step. 现在，我可以逐步进行。 Thanks for all :) 谢谢大家:)

Answer 1

Have you tried to remove @ManagedBean annotation and import javax.enterprise.context.SessionScoped instead of javax.faces.bean.SessionScoped? 您是否尝试过删除@ManagedBean批注并导入javax.enterprise.context.SessionScoped而不是javax.faces.bean.SessionScoped？

It seems to me that at this moment you are mixing CDI beans with Backing beans. 在我看来，此刻您正在将CDI bean与Backing bean混合在一起。 Details and differences are provided at this link 此链接提供了详细信息和不同之处

Answer 2

I tried to reproduce your Problem: 我试图重现您的问题：

Bean 豆角，扁豆

@ManagedBean
@ViewScoped
public class TestBean {

    private String testValue = "a";

    public void setTestValue(final String testValue) {
        this.testValue = testValue;
    }

    public String getTestValue() {
        return testValue;
    }

    public void testAction() {
        setTestValue("b");
    }
}

View 视图

<h:outputText id="testId" value="#{roleEditController.testValue}" />
<p:commandButton update="testId" action="#{roleEditController.testAction}" />

But in my case it is working :/ 但就我而言，它正在工作：/

Don't you get any javascript or java errors? 您没有收到任何JavaScript或Java错误？
Did you try to use the absolute id to update the component? 您是否尝试使用绝对ID来更新组件？

You can find the absolute id if you inspect the page with your Browser: 如果使用浏览器检查页面，则可以找到绝对ID：

<span id="form:testId">a</span>

In this case the absolute id would be :form:testId 在这种情况下，绝对ID为：form：testId

从p：commandButton更新不起作用

问题描述

2 个解决方案

解决方案1
1 已采纳 2016-02-26 10:27:00

解决方案2
0 2016-02-26 10:06:31

Bean 豆角，扁豆

View 视图

从p：commandButton更新不起作用

问题描述

2 个解决方案

解决方案1 1 已采纳 2016-02-26 10:27:00

解决方案2 0 2016-02-26 10:06:31

Bean 豆角，扁豆

View 视图

解决方案1
1 已采纳 2016-02-26 10:27:00

解决方案2
0 2016-02-26 10:06:31