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87 lines
2.4 KiB
87 lines
2.4 KiB
12 years ago
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/*!
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* jquery.event.drag.live - v 2.2
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* Copyright (c) 2010 Three Dub Media - http://threedubmedia.com
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* Open Source MIT License - http://threedubmedia.com/code/license
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*/
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// Created: 2010-06-07
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// Updated: 2012-05-21
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// REQUIRES: jquery 1.7.x, event.drag 2.2
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;(function( $ ){
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// local refs (increase compression)
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var $event = $.event,
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// ref the special event config
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drag = $event.special.drag,
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// old drag event add method
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origadd = drag.add,
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// old drag event teradown method
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origteardown = drag.teardown;
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// allow events to bubble for delegation
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drag.noBubble = false;
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// the namespace for internal live events
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drag.livekey = "livedrag";
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// new drop event add method
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drag.add = function( obj ){
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// call the old method
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origadd.apply( this, arguments );
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// read the data
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var data = $.data( this, drag.datakey );
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// bind the live "draginit" delegator
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if ( !data.live && obj.selector ){
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data.live = true;
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$event.add( this, "draginit."+ drag.livekey, drag.delegate );
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}
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};
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// new drop event teardown method
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drag.teardown = function(){
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// call the old method
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origteardown.apply( this, arguments );
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// read the data
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var data = $.data( this, drag.datakey ) || {};
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// bind the live "draginit" delegator
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if ( data.live ){
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// remove the "live" delegation
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$event.remove( this, "draginit."+ drag.livekey, drag.delegate );
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data.live = false;
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}
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};
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// identify potential delegate elements
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drag.delegate = function( event ){
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// local refs
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var elems = [], target,
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// element event structure
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events = $.data( this, "events" ) || {};
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// query live events
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$.each( events || [], function( key, arr ){
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// no event type matches
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if ( key.indexOf("drag") !== 0 )
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return;
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$.each( arr || [], function( i, obj ){
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// locate the element to delegate
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target = $( event.target ).closest( obj.selector, event.currentTarget )[0];
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// no element found
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if ( !target )
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return;
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// add an event handler
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$event.add( target, obj.origType+'.'+drag.livekey, obj.origHandler || obj.handler, obj.data );
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// remember new elements
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if ( $.inArray( target, elems ) < 0 )
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elems.push( target );
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});
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});
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// if there are no elements, break
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if ( !elems.length )
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return false;
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// return the matched results, and clenup when complete
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return $( elems ).bind("dragend."+ drag.livekey, function(){
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$event.remove( this, "."+ drag.livekey ); // cleanup delegation
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});
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};
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})( jQuery );
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