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Daniel Cook

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Events: unsubscribe after one firing?

Post Posted: Tue Feb 09, 2010 2:11 pm
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I am using the IO module as suggested in the documentation and I am passing through a few arguments. The problem lies in the fact that if I rerun this code a few times, I am subscribing multiple times to the 'io:complete' event with different arguments. The solution I came up with was to store the subscription in a variable and then, later, detach but that is rather cumbersome. Any ideas?
Code:
var eventSubscription;
function sendData(callback){
       eventSubscription = Y.on('io:complete', handleResponse , this, {callback: callback} );
   var request = Y.io('somesite.com');   
}

function handleResponse(trans, response, args){
    eventSubscription.detach();
    args.callback();
}

sendData(function(){
alert('first');
});

sendData(function(){
alert('second');
});
-dcunited

Dav Glass

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Re: Events: unsubscribe after one firing?

Post Posted: Tue Feb 09, 2010 2:14 pm
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You don't have to listen globally, the examples on the IO landing page just don't show the transactional event listeners.

This example shows both:
http://developer.yahoo.com/yui/3/exampl ... o-get.html

In your case you want to listen on each transaction and not globally.

Daniel Cook

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Re: Events: unsubscribe after one firing?

Post Posted: Wed Feb 10, 2010 7:29 am
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Thanks Dav.

Adrian Ziemkowski

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Re: Events: unsubscribe after one firing?

Post Posted: Wed Feb 10, 2010 12:56 pm
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davglass wrote:
In your case you want to listen on each transaction and not globally.


The idea is still nice though. I was just checking the API for something like a Y.once() a few days ago while refactoring some jQuery code that was using their one() method to execute some code just once after a particular ajax call had run (sort of like an onready for an iframe, but for a div with dynamic content).

Wasn't much to work around it of course, but it would be a nice shortcut for sure, especially with quick anonymous functions.

Didn't find a ticket for something like this, so I created ticket 2528618

Update: This is coming in YUI 3.1.0 (see ticket for details)
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