Howto remove an InterCeptor?

[Wolfgang]

Hello,

can anyone guide me on how to remove an Interceptor created like this?


MY.util.prototype.fireEvent.createInterceptor(Base.process, Base);


The interceptor works, but how can i remove it dynamically when i do not need it anymore?

[evant]

Why not just keep a reference to it?



var old = MY.util.fireEvent;
My.util.fireEvent = My.util.fireEvent.createInterceptor(Base.process, Base);
My.util.fireEvent = old;

[franklt69]

a doubts, when is useful to use Interceptor?

regards
Frank

[Wolfgang]

@evant
Do you think it is really that easy? I thought i would need something like removeInterceptor
(Which is not part of EXT).

@franklt69

a doubts, when is useful to use Interceptor?
Basically when you want to be part of the event handler chain and need to intercept an event to do some custom stuff before further processing.

[evant]

Try it:



function f1()
{
alert('in f1');
return true;
}

function f2()
{
alert('in f2');
return true;
}
Ext.onReady(function()
{
var old = f1;
f1 = f1.createInterceptor(f2);
f1();
f1 = old;
f1();
}
);

[jack.slocum]

This kind of a side note but in 2.0, with Observable objects you can actually "subscribe" to methods (and unsubscribe). e.g.

myObj.beforeMethod('myMethod', Base.process, Base);

and

myObj.removeMethodListener('myMethod', Base.process, Base);

This means multiple "interceptors" and "sequences" can be added just like event handlers (a must for plugins, for example).

Another difference with the method listeners vs interceptor is they can also override the return value of the function.

[Wolfgang]

@evant
Thank you for the example.

@Jack
Thanks for the info about V2.0.

Regards

Wolfgang