shaun <[EMAIL PROTECTED]> wrote:
>
http://blog.iconara.net/2007/11/05/a-generic-way-to-remove-an-event-listener/
Thank you gents - that solved my anonymous function problem and
started me down the road of a more generic solution.
Borrowing directly from ExtJS [1] (licenced under GPLv3) and extending
the Function primative, I came up with this:
/**
* Create a combined function call sequence of the original function +
the passed function.
* The resulting function returns the results of the original
function. The passed fcn is called
* with the parameters of the original function.
*
* Parameters:
*
* * fcn : Function
* The function to sequence
* * scope : Object
* (optional) The scope of the passed fcn (Defaults to scope of
original function)
*
* Returns:
*
* * Function
* The new function
*/
Function.prototype.createSequence =
function(fcn:Function,scope:Object=null):Function {
if(typeof fcn!="function"){
return this
}
var C=this;
return function(){
var D=C.apply(this,arguments);
fcn.apply(scope||this,arguments);
return D
}
}
And then an alternative addEventListener function which accepts an
options config object:
public function addListener(fn,opts=null) {
if(opts.single) {
fn = fn.createSequence(function(event) {
event.currentTarget.removeEventListener(event.type, fn)
})
}
myEventBroadcaster.addEventListener(Event.EVENT_TYPE,fn);
}
More information on the ExtJS code can be found in their docs at [2]
[1] http://extjs.com
[2] http://extjs.com/deploy/dev/docs/
