我有得到它是从一个VAR值，当你点击一个按钮的标签。该变种已经宣布：

I have a label that get it's value from a var when you click on a button. The var has already been declared:

public function clickevent
{
label.text = aVariable; 
}

现在我知道，如果我有一个标签，像这样的：

Now I know that if i have a label like this:

<s:Label id="label2" text="{aVariable}"/> 

和aVariable是空的，LABEL2的文本是空（它不给一个错误，只是空，在我的情况）。这是我目前的状况。

and aVariable is empty, label2's text is Null (it doesn't give an error, just "Null" in my situation). This is my current situation.

我想知道的是，当我后来就aVariable的值更改为一个字符串hasChanged为例。该LABEL2的文本也应更改为hasChanged，而无需按下一个按钮或任何东西，使这个更改的用户。如何才能做到这一点？

What I'd like to know is when I later on change the aVariable's value to a string "hasChanged", for example. The label2's text should also change to "hasChanged" without the user having to push a button or anything to make this change. How can this be done?

推荐答案

我不是100％肯定我明白你的问题，但如果你的变量声明为绑定，不管你的脚本改变其价值或按钮，标签的文本propertie将遵循因为它是绑定。

I'm not 100% sure I understand your question but if your variable is declared as "bindable", no matter if your script change its value or a button, your text propertie of the label will follow as it is binded.

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:s="library://ns.adobe.com/flex/spark" 
    xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <![CDATA[
            [Bindable]
            private var aVariable:String;

            protected function button1_clickHandler(event:MouseEvent):void
            {
                aVariable = "My new value";
            }
        ]]>
    </fx:Script>

    <s:layout>
        <s:VerticalLayout/>
    </s:layout>

    <s:Label text="{aVariable}"/>

    <s:Button label="Click me" click="button1_clickHandler(event)"/>

</s:WindowedApplication>