在Flex中将变量从一个组件传递到另一个组件时出现错误

Question

尝试将变量从一个组件传递到另一个组件时出现错误。 我有一个主要的MXML和2个组件。我的档案如下：

Main MXML 

<?xml version="1.0" encoding="utf-8"?> 
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
       xmlns:s="library://ns.adobe.com/flex/spark" 
       xmlns:mx="library://ns.adobe.com/flex/mx" 
       height="100%" width="100%" xmlns:comps="components.*"> 


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


    <s:Group width="100%" height="100%"> 

      <s:HGroup> 
       <habilitations:CMS comps="{this}" width="637" height="48"/> 
      </s:HGroup> 

      <s:Spacer/> 

      <s:HGroup height="70%" width="30%"> 
       <comps:Component1 comps="{this}"/> 
<comps:Component2 comps="{this}"/> 
      </s:HGroup> 
</s:Application> 




Component1 


<?xml version="1.0" encoding="utf-8"?> 
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" 
     xmlns:s="library://ns.adobe.com/flex/spark" 
     xmlns:mx="library://ns.adobe.com/flex/mx" 
     width="400" height="100%"> 
    <s:layout> 
     <s:VerticalLayout/> 
    </s:layout> 

    <fx:Script> 
     <![CDATA[ 
      import mx.collections.XMLListCollection; 
      import mx.controls.Alert; 
      import mx.events.FlexEvent; 

      [Bindable] 
      public var testvar:String ="MYTEST"; 

      [Bindable] 
      public var mainMXML:MainMXML; 

     ]]> 
    </fx:Script> 


</s:Group> 




Component2 

<?xml version="1.0" encoding="utf-8"?> 
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009" 
     xmlns:s="library://ns.adobe.com/flex/spark" 
     xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300"> 
    <fx:Script> 
     <![CDATA[ 
      import mx.controls.Alert; 


      [Bindable] 
      public var mycomponent1:Component1; 
      [Bindable] 
      public var mainMXML:MainMXML; 

      protected function clickHandler(event:MouseEvent):void 
      { 
       Alert.show(new String(mycomponent1.testvar)); 

      } 


]]> 
    </fx:Script> 


    <s:Button click="clickHandler(event)"/> 

</s:Group> 



But I am getting the error : 

Error #1009: Cannot access a property or method of a null object reference. 

任何人都可以帮忙吗？

Answer 1

给你的分量id的

然后你可以去MyComp.SomePublicVar =值

从第二个比较，你可以去Alert.show（parentDocument.parentDocument.MyComp.SomePublicVar）;

类似的东西;）