RE: [flexcoders] Using Container.addChild(), can we not assign the id property and use it to refrence the new control?
Since most classes in the Flex framework are non-dynamic, assigning the
value canvas1 to the 'id' property at runtime can't create an instance
variable called canvas1 that contains a reference to your new Canvas,
which is what the MXML compiler does when it processes the id=canvas1
attribute at compile time.
However, you can simply declare this instance variable yourself:
private var canvas1:Canvas;
private function addCanvas(oEvent:Event):void
{
canvas1 = new Canvas();
canvas1.width = 300;
canvas1.height = 100;
addChild(canvas1);
}
private function addControlToCanvas(oEvent:Event):void
{
var textAreaNew:TextArea = new TextArea();
textAreaNew.text = Hello, Other World!;
canvas1.addChild(textAreaNew);
}
This is the recommended technique. We don't recommend using
getChildByName() to find dynamically created components.
- Gordon
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Tracy Spratt
Sent: Monday, November 27, 2006 1:49 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Using Container.addChild(), can we not assign the
id property and use it to refrence the new control?
When I try, I get an error that the control is not a property of the
app. For example:
I add a Canvas, and set the ID
private function addCanvas(oEvent:Event):void
{
caNew = new Canvas();
caNew.id = canvas1
caNew.name = canvas1;
caNew.width = 300;
caNew.height = 100;
this.addChild(caNew);
}//
//I try to add a control to the canvas
private function addControlToCanvas(oEvent:Event):void
{
var TextAreaNew:TextArea = new TextArea();
TextAreaNew.text = Hello, Other World!
//Of course, we can't use the id directly because it does not exist
at compile time, but
//The next line, using bracket notation on the id of the canvas
still does not find the instance.
//is the bracket notation getting evaluated at compile-time, that
would explain it.
this[canvas1].addChild(TextAreaNew);
//The following two comment lines show a method that DOES work
//var caTemp:Canvas = Canvas(this.getChildByName(canvas1));
//caTemp.addChild(TextAreaNew);
}//
So is it possible to assign and use an id for a dynamically instantiated
control instance? Or is getChildByName the best solution?
Tracy
RE: [flexcoders] Using Container.addChild(), can we not assign the id property and use it to refrence the new control?
I get it, thanks!
Tracy
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Gordon Smith
Sent: Monday, November 27, 2006 5:45 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Using Container.addChild(), can we not assign
the id property and use it to refrence the new control?
Since most classes in the Flex framework are non-dynamic, assigning the
value canvas1 to the 'id' property at runtime can't create an instance
variable called canvas1 that contains a reference to your new Canvas,
which is what the MXML compiler does when it processes the id=canvas1
attribute at compile time.
However, you can simply declare this instance variable yourself:
private var canvas1:Canvas;
private function addCanvas(oEvent:Event):void
{
canvas1 = new Canvas();
canvas1.width = 300;
canvas1.height = 100;
addChild(canvas1);
}
private function addControlToCanvas(oEvent:Event):void
{
var textAreaNew:TextArea = new TextArea();
textAreaNew.text = Hello, Other World!;
canvas1.addChild(textAreaNew);
}
This is the recommended technique. We don't recommend using
getChildByName() to find dynamically created components.
- Gordon
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Tracy Spratt
Sent: Monday, November 27, 2006 1:49 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Using Container.addChild(), can we not assign the
id property and use it to refrence the new control?
When I try, I get an error that the control is not a property of the
app. For example:
I add a Canvas, and set the ID
private function addCanvas(oEvent:Event):void
{
caNew = new Canvas();
caNew.id = canvas1
caNew.name = canvas1;
caNew.width = 300;
caNew.height = 100;
this.addChild(caNew);
}//
//I try to add a control to the canvas
private function addControlToCanvas(oEvent:Event):void
{
var TextAreaNew:TextArea = new TextArea();
TextAreaNew.text = Hello, Other World!
//Of course, we can't use the id directly because it does not exist
at compile time, but
//The next line, using bracket notation on the id of the canvas
still does not find the instance.
//is the bracket notation getting evaluated at compile-time, that
would explain it.
this[canvas1].addChild(TextAreaNew);
//The following two comment lines show a method that DOES work
//var caTemp:Canvas = Canvas(this.getChildByName(canvas1));
//caTemp.addChild(TextAreaNew);
}//
So is it possible to assign and use an id for a dynamically instantiated
control instance? Or is getChildByName the best solution?
Tracy
