JSF与setValueExpression绑定只读？ [英] JSF binding with setValueExpression read-only?

问题描述

我尝试在后台bean中创建一个InputField并将其添加到视图中，但是数据绑定似乎只是只读。

我创建一个UIInput在这样的Backing-Bean中：

  UIComponent textInput = new UIInput（）; 
 textInput.setId（operandInputText）; 
 textInput.setValueExpression（value，ef.createValueExpression（elCtx，＃{row.operandValues [0]}，String.class））; 
 textInput.setValueExpression（rendered，ef.createValueExpression（elCtx，＃{row.inputType =='text'}，Boolean.class））; 
 mInputPanelGroup.getChildren（）。add（textInput）; 
  

panelGroup位于dataTable的列中，并绑定到bean：

 < p：column id =operandColumn> 
< h：panelGroup id =inputPanelGroupbinding =＃{locateEmployeeBean.inputPanelGroup}> 
< h：inputText id =testInputvalue =＃{row.operandValues [0]}/> 
< / h：panelGroup> 
< / p：column> 
  

< h：inputText /> PanelGroup里面只是用于测试，这是我发现我使用 setValueExpression（...）所做的绑定至少是只读的。

在浏览器中，我现在有2个inputField，首先是'testInput'，然后是'operandInputText'。
当我在'operandInputText'中输入一个值并提交时，该值不会被保存，但是当我在'testInput'-Field'中输入一个值时，它会被提交，另外该值显示在BOTH inputFields

operandValues是一个simpe对象数组：

  private Object [] mOperandValues = new Object [2]; 
  

这可能与dataType有任何关系，我传递给 setValueExpression（。 ..）？
我尝试了对象，但没有改变任何东西。

任何想法为什么会发生这种情况？
提前感谢

解决方案

我找到了解决问题的办法。老实说，这是@BalusC使用Datatables的一篇文章：填充datatable是什么让我在正确的路径。

以前，我在PreRenderView阶段添加了组件，然后我看到您的示例，您填充了getter中的绑定组件ONCE（在RestoreView阶段中显然是较早的方法）。这就是我现在所做的工作，它的工作原理是完美的，Inputfields现在工作方式（读+写）。

非常感谢你的工作@BalusC！ / p>

I try to create an InputField in the backing bean and add it to the view, but the databinding seems to work just read-only.

I create a UIInput in the Backing-Bean like this:

UIComponent textInput = new UIInput();
textInput.setId("operandInputText");
textInput.setValueExpression("value", ef.createValueExpression(elCtx, "#{row.operandValues[0]}", String.class));        
textInput.setValueExpression("rendered", ef.createValueExpression(elCtx, "#{row.inputType == 'text'}", Boolean.class));     
mInputPanelGroup.getChildren().add(textInput);

The panelGroup is inside a column of a dataTable and bound to the bean:

<p:column id="operandColumn">
    <h:panelGroup id="inputPanelGroup" binding="#{locateEmployeeBean.inputPanelGroup}" >
        <h:inputText id="testInput" value="#{row.operandValues[0]}" />
    </h:panelGroup>
</p:column>

The <h:inputText/> inside the PanelGroup is just for testing and this is where I found out that the binding I did with setValueExpression(...) works at least read-only.

In the browser I now have 2 inputFields, first the 'testInput' and then 'operandInputText'. When I enter a value in 'operandInputText' and submit, the value does not get saved, but when I enter a value in the 'testInput'-Field, it get's submitted and in addition the value gets displayed in BOTH inputFields.

The operandValues is a simpe object array:

private Object[] mOperandValues = new Object[2];

Could this have anything to do with the dataType I pass to setValueExpression(...)? I tried Object, but that didn't change anything.

Any idea why this happens? Thanks in advance!

解决方案

I found the solution to my problem. Honestly it was an article by @BalusC Using Datatables: Populate datatable what took me on the right path.

Previously I added the components during PreRenderView-Phase, then I saw in your example that you populate the bound component ONCE in the getter (which is then obviously way earlier during RestoreView-Phase). That is how I've done it now and it works flawlessly, the Inputfields now work both ways (read+write).

Thanks alot for your work @BalusC!

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