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Thread: Ext equivalent to the jQuery method .live()

  1. #1
    Ext JS Premium Member
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    Default Answered: Ext equivalent to the jQuery method .live()

    Does such a thing exist or will I need to roll my own?

    http://api.jquery.com/live/

    Description: Attach an event handler for all elements which match the current selector, now and in the future.

  2. You achieve it by using the delegate option:

    http://docs.sencha.com/ext-js/4-1/#!...od-addListener

    Code:
    Ext.getBody().on('click', function(){
        console.log('You clicked foo');
    }, null, {
        delegate: '.foo'
    });

  3. #2
    Sencha Premium User evant's Avatar
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    Default

    You achieve it by using the delegate option:

    http://docs.sencha.com/ext-js/4-1/#!...od-addListener

    Code:
    Ext.getBody().on('click', function(){
        console.log('You clicked foo');
    }, null, {
        delegate: '.foo'
    });
    Twitter - @evantrimboli
    Former Sencha framework engineer, available for consulting.
    As of 2017-09-22 I am not employed by Sencha, all subsequent posts are my own and do not represent Sencha in any way.

  4. #3
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    Default

    Had not seen the delegate argument, that is perfect - thanks!

  5. #4
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    Default

    Actually, one more quick question - delegate refers to a DOM selector, is there an option or a way to have delegate use ComponentQuery instead?

    It would be easy enough to bake that myself, just asking if it's already built in.

  6. #5
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    Default

    Is this alos a viable solution?

    Code:
    	        	Ext.util.Observable.observe(Ext.util.Observable);
    	        	
    	        	Ext.util.Observable.on('click', function(context, event, options) {
    		        	// intercept here
    	        	});

  7. #6
    Sencha Premium User evant's Avatar
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    The equivalent to live would be the controller in the MVC structure.

    Otherwise, you could instantiate the EventBus yourself.
    Twitter - @evantrimboli
    Former Sencha framework engineer, available for consulting.
    As of 2017-09-22 I am not employed by Sencha, all subsequent posts are my own and do not represent Sencha in any way.

  8. #7
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    Default

    Is it possible to have a controller intercept an event? Making assumptions here, but I'm guessing the controller uses event delegation to bind listeners, which means a buttons "handler" will fire first, then the event will bubble up to the body and then call the appropriate delegate, the problem is that I need to fire my override first, then possibly stop propagation.

    So far the best way I have found to do this is to observe a class, like "Ext.form.Basic" or "Ext.util.Observable" and listen to their events, like "actioncomplete" or "click" - this lets me run an override first then either cancel propagation or not.

    I certainly didn't explain myself properly in my original post and I'm not entirely sure I am now.

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