在弹出窗口中显示facesontext消息以验证对话框中的输入 [英] Display facesontext message in pop up for validating input in a dialog box

问题描述

我对如何在对话框中显示facescontext消息感到怀疑. 这使用的是Primefaces 4.0，JSF.

I have doubt regarding how to show facescontext messages in a dialog box. This uses primefaces 4.0, JSF.

我想在弹出对话框(单击另一个对话框中的命令按钮时显示)中显示facescontext消息.

I want to display a facescontext message in pop up dialog box (which appears on clicking a commandbutton in another dialog box).

方法1: 假设视图文件就像

<p:commandButton id="btn"  oncomplete="dlg.show()"/>
<p:dialod id="dlg_id" widgetVar="dlg">
    <h:inputText id="name"/>
    <p:commandButton id="btn1" actionListener="someBean.someMethod()" oncomplete="dlg1.show()"/>
</p:dialog>
<p:dialog id="dlg1_id" widgetVar="dlg1">
    <h:messages id="error_msgs" value="#{facesContext.messageList}"
</p:dialog>

BackingBean(someBean)

public void someMethod() {
        RequestContext.getCurrentInstance().addCallBackParam("facesMessageAvailable",true);
        FacesContext.getCurrentInstance().addMessage("error_msgs",new FacesMessage(…,"Name is Required",…));
    }

以上方法显示弹出框.但是弹出框中显示的值就像javax.beans.context@1ggh34ea 然后我尝试使用UI组件绑定.

The above method shows the pop up box. But the value shown in the pop up box is like javax.beans.context@1ggh34ea Then I tried using UI component binding.

方法2:

查看文件

<p:commandButton id="btn"  oncomplete="dlg.show()"/>
<p:dialog id="dlg_id" widgetVar="dlg">
    <h:inputText id="name"/>
    <p:commandButton id="btn1" actionListener="someBean.someMethod()" oncomplete="dlg1.show()"/>
</p:dialog>
<p:dialog id="dlg1_id" widgetVar="dlg1">
    <h:outputText id="msg" binding="someBean.outText"/>
</p:dialog>

BackingBean(someBean)

private UIComponent outText;
//getter and setter of outText
public void someMethod() {
    RequestContext.getCurrentInstance().addCallBackParam("facesMessageAvailable",true);
    FacesContext.getCurrentInstance().addMessage(outText.getClientId() , new FacesMessage(…,"Name is Required",…));
}

但是这会显示一个空白的空白弹出窗口. 然后，我尝试使用JOptionPane.但这会产生一些逻辑错误.

But this shows a blank empty pop up. Then I tried using JOptionPane. But it produces some logical errors.

我将不胜感激. 当我从内存中键入代码时，语法可能不正确.

I would appreciate any help. The syntax may be incorrect as i typed the code from my memory.

推荐答案

我尝试了您的方法1 ，发现有一些错误:

I tried your Method 1 and found there are some mistakes:

1.您应指定<p:commandButton>的update属性.
2.无需指定<h:messages>的value=#{facesContext.messageList}(也没有这样的属性).

1.You should specify update attribute of the <p:commandButton>.
2.No need to specify value="#{facesContext.messageList}" of <h:messages> (And there's also no such attribute).

因此，执行完这些操作后，您的代码应如下所示:

So, after doing those, your code should like this:

    <h:form>
        <p:commandButton id="btn"  oncomplete="dlg.show()"/>

        <p:dialog id="dlg_id" widgetVar="dlg">
            <h:inputText id="name"/>
            <p:commandButton id="btn1" actionListener="#{someBean.someMethod()}" oncomplete="dlg1.show()" update="dlg1_id"/>
        </p:dialog>

        <p:dialog id="dlg1_id" widgetVar="dlg1">
            <h:messages id="error_msgs"/>
        </p:dialog>

    </h:form>  

结果如下:

And the result looks like:

它在上面使用<h:messages>，而您可能希望使用<h:message>，因为您似乎希望显示error_msgs的消息.为此，您需要指定 client_id 而不是 id ，因此请尝试以下操作:

It's using <h:messages> above, while you may want to use <h:message> as you seems want the message show for error_msgs. To do so, you need to specify the client_id instead of id, so try this:

页面:

    <h:form>
        <p:commandButton id="btn"  oncomplete="dlg.show()"/>

        <p:dialog id="dlg_id" widgetVar="dlg">
            <h:inputText id="name"/>
            <p:commandButton id="btn1" actionListener="#{someBean.someMethod()}" oncomplete="dlg1.show()" update="dlg1_id"/>
        </p:dialog>

        <p:dialog id="dlg1_id" widgetVar="dlg1">
            <h:message for="j_idt5"/>
        </p:dialog>
    </h:form> 

后备豆:

public void someMethod(){
    RequestContext.getCurrentInstance().addCallbackParam("facesMessageAvailable",true);
    FacesContext.getCurrentInstance().addMessage("j_idt5",new FacesMessage("Name is Required"));
}

请注意， j_idt5 是<h:inputText>的client_id.
我怎么知道client_id?只需右键单击浏览器中的页面并查看页面源代码，查看您感兴趣的组件，即可找到 cliend_id .

Note that j_idt5 is the client_id of the <h:inputText>.
How can I know the client_id? Just right click on the page in the browser and View page source code, look at the component you are interested in and you'll find the cliend_id.

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