I'm preferring this way instead of closures:
for( var key in data )
{
var button = new qx.ui.form.Button( data[key].label );
button.setUserData("id", key);
vbox.add(button);
button.addListener("execute",function(ev){
alert("Bad:" + data[ev.getTarget().getUserData("id")].label);
},this);
}
Not tested, maybe there is bug in code, but logically is should be ok.
2009/10/26 Derrell Lipman <[email protected]>:
> On Sun, Oct 25, 2009 at 20:39, panyasan <[email protected]> wrote:
>>
>> What I am trying to achieve is to get a local variable ('key') that is the
>> product of the iteration through the keys of an object into a closure
>> (here:
>> an event listener). The problem is that when the event listener is called,
>> the variable "key" evaluates to the last value it had when the iteration
>> was
>> completed, not to the value it had when the even listener was created. The
>> only solution I could come up after a lot of experimenting was to use an
>> ugly eval. Does anyone have a better idea?
>
> var vbox = new qx.ui.container.Composite( new qx.ui.layout.VBox(5));
> this.getRoot().add(vbox);
> var data = {
> "one": { label: "One" },
> "two" : { label: "Two" },
> "three":{ label: "Three" },
> "four":{ label: "Four" },
> "five":{ label: "Five" }
> };
>
> for( var key in data )
> {
> var button = new qx.ui.form.Button( data[key].label );
> vbox.add(button);
>
> // this doesn't work
> button.addListener("execute",function(){
> alert("Bad:" + data[key].label);
> },this);
>
> (function()
> {
> var thisKey = key;
> button.addListener("execute", function(){
> alert("Good:" + data[thisKey].label);
> },this);
> })();
> }
>
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--
Best regards
- Petr Kobalicek <http://kobalicek.com>
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ahead of the curve. Join us from November 9 - 12, 2009. Register now!
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