Thanks , your method really helps, but I have another question, I was using Expressions Window to watch the value of "myProperty" in the Script, but it always show in this way "myProperty=...", I cannot see the real value of the myProperty, Is there anything I can do with the Expression window or there is something wrong with the value of myProperty, Thanks.
can you be so nice to help me again? Ashly --- In [email protected], "valdhor" <[EMAIL PROTECTED]> wrote: > > There is a timing problem. > > The script is running before myComponent is actually created so you > get an error to the effect that you are trying to access a property of > a null object. > > The best way is to wait for the object you are trying to access to be > created and then access it. One way is to use the creationComplete event: > > <?xml version="1.0" encoding="utf-8"?> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > layout="absolute" xmlns:local="*" > creationComplete="onCreationComplete()"> > <mx:Script> > <![CDATA[ > public var myProperty:String; > > private function onCreationComplete():void > { > myProperty = myComponent.myFirstProperty; > } > ]]> > </mx:Script> > <local:MyFirstComponent id="myComponent" myFirstProperty="Welcome to > Flex" /> > <mx:Label text="{myComponent.myFirstProperty}" id="myLabel"/> > </mx:Application> > > --- In [email protected], "ashlytu" <ayumimodest@> wrote: > > > > when I read "the Essential guide to flex 3" > > from page 87 to 95, there is a example , in the application MXML ,the > > code is > > > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > > layout="absolute" xmlns:local="*"> > > <mx:Script> > > <![CDATA[ > > > > public var myProperty:String = > > myComponent.myFirstProperty; > > > > ]]> > > </mx:Script> > > <local:MyFirstComponent id="myComponent" myFirstProperty="Welcome to > > Flex" /> > > <mx:Label text="{myComponent.myFirstProperty}" id="myLabel"/> > > > > </mx:Application> > > > > and in the component file :MyFirstComponent ,is just these code below: > > > > <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"; width="400" > > height="300"> > > <mx:Script> > > <![CDATA[ > > [Bindable] > > public var myFirstProperty:String; > > ]]> > > </mx:Script> > > </mx:Canvas> > > > > I followed all the steps, and would like to view the value of > > "myProperty" in the script section of the Application MXML file, in > > the Expressionis frame, but the error was "TypeError: Error #1009:", > > It's seems like "myProperty" cannot get the value from a object > attribute. > > > > what is wrong with it? > > Thanks a lot! > > > > Ashly > > >
