Can I use a bindable string for a ComboBox prompt?
-
03-07-2019 - |
Question
The following displays a ComboBox with the text "Select One":
**This is pseudo code*
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:ComboBox prompt="Select One">
<mx:dataProvider>
<mx:Array>
<mx:Object label="Obj 1" />
<mx:Object label="Obj 2" />
<mx:Object label="Obj 3" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
</mx:Application>
However, the following displays a ComboBox with the text "Obj 1" (the label of the first item):
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
[Bindable]
private var promptText:String = "Select One";
]]>
</mx:Script>
<mx:ComboBox prompt="{promptText}">
<mx:dataProvider>
<mx:Array>
<mx:Object label="Obj 1" />
<mx:Object label="Obj 2" />
<mx:Object label="Obj 3" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
</mx:Application>
Why can't I use a Bindable String for the prompt???
Solution
This worked:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
[Bindable]
private var promptText:String = "Select One";
]]>
</mx:Script>
<mx:ComboBox selectedIndex="-1" prompt="{promptText}">
<mx:dataProvider>
<mx:Array>
<mx:Object label="Obj 1" />
<mx:Object label="Obj 2" />
<mx:Object label="Obj 3" />
</mx:Array>
</mx:dataProvider>
</mx:ComboBox>
</mx:Application>
I can't figure out why I have to explicitly set selectedIndex to -1, but, it works!
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