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Well, the binding is going to work right? You’re
just going to get the warning (which you can turn off in flex-config in
production). Casting length to a number isn’t going to work, what you’d
want to do to avoid the warning is cast the Array to something else (like
Object). However if you do that you’re at risk of it not working at all
because the binding mechanism will mess with the Array instance in
unpredictable ways. So I think doing the variable declaration is probably your
best bet if you want to keep warnings on but avoid the issue with your length
function. Of course the other thing you could do is
create a utility function getArrayLength that simply returns the array’s length.
Then you could bind to the result of the function: function getArrayLength(arr:Array):Number { return arr.length; } <mx:ComboBox visible=”{getArrayLength(app.p(“Drawing
Data”).valuesarray) == 0}” /> Matt From: Yes, that will work, plus one should
always type their variables. But I would rather not have to create this
extra var if I don’t have to. The Casting trick usually works, but not
in this situation. From: i usually make a var in actionscript and bind this to mxml.. // actionscript var binding = (Number(app.p('DrawingData').valuesarray.length)
== 0); // in mxml <mx:ComboBox visible = {binding}/> i also would like to know if that is the best/only way to do it.. Thijs Op 22-jun-2005, om 2:41 heeft Tracy Spratt het volgende geschreven: I
have a custom object, and in the example line below,
an
instance is returned by a function. The object has a
property, “valuesarray”, which is typed as an Array. This
is a case where I would like binding to correctly, but I am getting the binding
warning. I
tried casting the length to a Number:
visible="{Number(app.p('DrawingData').valuesarray.length)
== 0}" but
I still get the same warning: “Changes to
property, length, from built-in object, Array, will not be detected” I
can code around this but I have it in several places, and
would like to be able to make this solution work. I
know Matt’s actually working, but does anyone else have any ideas? Yahoo! Groups Links
Yahoo! Groups Links
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