When you cast like this
var foo:Foo = Foo(whatever);
the syntax looks like a constructor-without-the-'new', but it actually
has nothing to do with a constructor. The name of a class can be used in
various unrelated ways:
new Foo() // constructs an instance of Foo
Foo(o) // casts o to type Foo
o = Foo // sets o to a reference to class Foo
Gordon Smith
Adobe Flex SDK Team
________________________________
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of hoytlee2000
Sent: Wednesday, April 23, 2008 1:31 AM
To: [email protected]
Subject: [flexcoders] Re: how do I loop thru dynamically created UI
components?
Hello Lee,
Thanks! that typecasting line worked perfectly!
It's interesting I tried to import just the HBox specifically and I
still got the error message
in the IDE as:
Implicit coercion of a value with static type
flash.display:DisplayObject to a possibly
unrelated type mx.containers:HBox.
If I read the line correctly, I can TypeCast a Display Object by using
the constructor of the
UIComponent?
Thanks,
hoyt
--- In [email protected] <mailto:flexcoders%40yahoogroups.com>
, Lee <[EMAIL PROTECTED]> wrote:
>
>
> hmm that's odd... i'm coding a project right now and that's what i
use... but i don't
import everything (*)... hehe
> anyway, if you want typecasting, i usually do something like this:
>
> var str:String =
TextInput(HBox(vbox.getChildAt(i)).getChildAt(1)).text;
>
> let me know if it's not still working and i'll try to figure it out :)
>
> -Lee
>
> ----- Original Message ----
> From: hoytlee2000 <[EMAIL PROTECTED]>
> To: [email protected] <mailto:flexcoders%40yahoogroups.com>
> Sent: Wednesday, April 23, 2008 3:04:29 PM
> Subject: [flexcoders] Re: how do I loop thru dynamically created UI
components?
>
> Hello Lee,
>
> Yes I did, if you mean by using the statement
>
> import mx.containers.*;
>
> I think the problem is that the getChildAt() method returns a
DisplayObject, but I don't
> know how to cast it as an HBox or any other UIComponent. The
DisplayObject doesn't
> even have a getChildAt() method.
>
> If I could figure out how to cast the returned DisplayObject as a
particular UI component
> that would be great. Thanks.
>
> be well,
> Hoyt
>
> --- In [email protected]
<mailto:flexcoders%40yahoogroups.com> , Lee <callistachan@> wrote:
> >
> > did you import them?
> >
> > ----- Original Message ----
> > From: hoytlee2000 <hoytlee2000@>
> > To: [email protected] <mailto:flexcoders%40yahoogroups.com>
> > Sent: Tuesday, April 22, 2008 6:38:47 AM
> > Subject: [flexcoders] Re: how do I loop thru dynamically created UI
components?
> >
> > Unfortunately it didn't work, I get an error saying I am trying to
> > implicitly coerce a type not defined in Display Object.
> >
> > be well,
> > hoyt
> >
> > --- In [email protected]
<mailto:flexcoders%40yahoogroups.com> , Lee <callistachan@> wrote:
> > >
> > > Hi, I replied below =)
> > >
> > > -- Lee
> > >
> > > ----- Original Message ----
> > > From: hoytlee2000 <hoytlee2000@>
> > > To: [email protected]
<mailto:flexcoders%40yahoogroups.com>
> > > Sent: Monday, April 21, 2008 5:21:13 PM
> > > Subject: [flexcoders] how do I loop thru dynamically created UI
> > components?
> > >
> > > Hello,
> > >
> > > I've created a button to let users add text input fields to the
app
> > so they can add additional information. That works fine, however I
am
> > at a
> > > lost on how to loop thru the newly added fields to get the input
so
> > I can send it to a php script to store in a sqlite database. I
> > thought I could
> > > iterate through the container using the numchild attr of the
> > enclosing container, but it returns a DisplayObject and that's where
I
> > get stuck.
> > >
> > > I don't know how to access the individual attrs (such as the .text
> > property) of the DisplayObject. I have the label and textinput
> > components
> > > wrapped in a hbox for formatting purposes.
> > >
> > > Also I noticed that when I try to set the id attr of the textfield
> > explicitly the getName method returns something entirely differemt
> > (see output
> > > after code below).
> > >
> > > Any help, tips, or web link would be appreciated. I'm stumped.
> > >
> > > Thanks,
> > > Hoyt
> > >
> > > my code:
> > >
> > > <?xml version="1.0" encoding="utf-8"?>
> > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> "
> > layout="absolute">
> > > <mx:Script>
> > > <![CDATA[
> > > import mx.controls.Label;
> > >
> > > private var numCount:int = 0;
> > >
> > > // this adds text input fields, it also adds an hbox
> > for formating
> > > private function addField():void {
> > > var newHbox:HBox = new HBox();
> > > var newLabel:Label = new Label();
> > > var newTextInput:TextInput = new TextInput();
> > >
> > > numCount = numCount + 1;
> > > debugField.text = numCount + "\n";
> > >
> > > newLabel.text = "Field " + numCount;
> > > newLabel.width = 50;
> > > newTextInput.width = 400;
> > >
> > > newHbox.id = "bbox" + numCount;
> > > debugField.text += newHbox.id + "\n";
> > >
> > > newHbox.addChild(newLabel);
> > > newHbox.addChild(newTextInput);
> > >
> > > vbox.addChild(newHbox);
> > > }
> > >
> > > // I use this function to test output and this is
> > where I need help. I want to
> > > // iterate through all the text input fields and read
> > the user input
> > > private function getInfo():void {
> > > var i:int = 0;
> > > for (i = 0; i < vbox.numChildren ; i++) {
> > > var tmpName:String = "hbox" + i;
> > > var tmpObj:DisplayObject = vbox.getChildAt(i);
> > > --------
> > > try something like this instead of the previous line (although
this
> > is kinda longer than typecasting directly)
> > >
> > > var tmpObj:HBox = vbox.getChildAt(i);
> > > var tmpTxt:TextInput = tmpObj.getChildAt(1);//because the text
input
> > is the 2nd child you added
> > > var str:String = tmpTxt.text;
> > > --------
> > > debugField.text += "Index is: " + i + "\n";
> > > debugField.text += tmpObj.toString() + "\n";
> >
> > > }
> > > }
> > >
> > > ]]>
> > > </mx:Script>
> > > <mx:Panel id="myPanel" x="460" y="10" width="513" height="297"
> > layout="absolute">
> > > <mx:VBox id="vbox" x="10" y="10" height="237" width="473">
> > > <mx:HBox id="hbox0" width="528" backgroundColor="#0A7C55">
> > > <mx:Label text="Url" width="49" color="#FFFFFF"
> > textAlign="center" height="20"/>
> > > <mx:TextInput width="412"/>
> > > </mx:HBox>
> > > </mx:VBox>
> > > </mx:Panel>
> > >
> > > <mx:TextArea x="44" y="162" height="145" id="debugField"
> > wordWrap="true" width="408"/>
> > >
> > > <mx:Button x="44" y="315" label="GetInfo" click="getInfo();"/>
> > >
> > > </mx:Application>
> > >
> > >
> > > This is the printout I get from the code:
> > >
> > > Index is: 0
> > > sandbox0.myPanel.vbox.hbox0
> > > Index is: 1
> > > sandbox0.myPanel.vbox.HBox89
> > > Index is: 2
> > > sandbox0.myPanel.vbox.HBox96
> > > Index is: 3
> > > sandbox0.myPanel.vbox.HBox104
> > >
> > > why is the id of the added HBox's Hbox89, HBox96, and HBox104?
> > instead of Hbox1, Hbox2, Hbox3?
> > >
> > >
> > > ------------------------------------
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