jQuery extension, add support `scrollstart` and `scrollend` events.
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/** | |
* jQuery extension, add support `scrollstart` and `scrollend` events. | |
* | |
* @author RubaXa <trash@rubaxa.org> | |
* @github https://gist.github.com/RubaXa/5568964 | |
* @license MIT | |
* | |
* | |
* @settings | |
* $.special.scrollend.delay = 300; // default ms | |
* | |
* @flags | |
* $.isScrolled; // boolean | |
* | |
* @binding | |
* $(window).bind('scrollstart scrollend', function (evt){ | |
* if( evt.type == 'scrollstart' ){ | |
* // logic | |
* } | |
* }); | |
* | |
*/ | |
(function ($){ | |
var | |
ns = (new Date).getTime() | |
, special = $.event.special | |
, dispatch = $.event.handle || $.event.dispatch | |
, scroll = 'scroll' | |
, scrollStart = scroll + 'start' | |
, scrollEnd = scroll + 'end' | |
, nsScrollStart = scroll +'.'+ scrollStart + ns | |
, nsScrollEnd = scroll +'.'+ scrollEnd + ns | |
; | |
special.scrollstart = { | |
setup: function (){ | |
var pid, handler = function (evt/**$.Event*/){ | |
if( pid == null ){ | |
evt.type = scrollStart; | |
dispatch.apply(this, arguments); | |
} | |
else { | |
clearTimeout(pid); | |
} | |
pid = setTimeout(function(){ | |
pid = null; | |
}, special.scrollend.delay); | |
}; | |
$(this).bind(nsScrollStart, handler); | |
}, | |
teardown: function (){ | |
$(this).unbind(nsScrollStart); | |
} | |
}; | |
special.scrollend = { | |
delay: 300, | |
setup: function (){ | |
var pid, handler = function (evt/**$.Event*/){ | |
var _this = this, args = arguments; | |
clearTimeout(pid); | |
pid = setTimeout(function(){ | |
evt.type = scrollEnd; | |
dispatch.apply(_this, args); | |
}, special.scrollend.delay); | |
}; | |
$(this).bind(nsScrollEnd, handler); | |
}, | |
teardown: function (){ | |
$(this).unbind(nsScrollEnd); | |
} | |
}; | |
$.isScrolled = false; | |
$(window).bind(scrollStart+' '+scrollEnd, function (evt/**Event*/){ | |
$.isScrolled = (evt.type == scrollStart); | |
$('body')[$.isScrolled ? 'addClass' : 'removeClass']('is-scrolled'); | |
}); | |
})(jQuery); |
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