Created
December 4, 2015 16:10
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| (function() { | |
| var lastTime = 0; | |
| var vendors = ['ms', 'moz', 'webkit', 'o']; | |
| for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) { | |
| window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']; | |
| window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] | |
| || window[vendors[x]+'CancelRequestAnimationFrame']; | |
| } | |
| if (!window.requestAnimationFrame) | |
| window.requestAnimationFrame = function(callback, element) { | |
| var currTime = new Date().getTime(); | |
| var timeToCall = Math.max(0, 16 - (currTime - lastTime)); | |
| var id = window.setTimeout(function() { callback(currTime + timeToCall); }, | |
| timeToCall); | |
| lastTime = currTime + timeToCall; | |
| return id; | |
| }; | |
| if (!window.cancelAnimationFrame) | |
| window.cancelAnimationFrame = function(id) { | |
| clearTimeout(id); | |
| }; | |
| }()); |
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| var lastScrollY = 0, | |
| ticking = false; | |
| function onScroll() { | |
| lastScrollY = $(window).scrollTop(); | |
| requestTick(); | |
| } | |
| /** | |
| * Calls rAF if it's not already | |
| * been done already | |
| */ | |
| function requestTick() { | |
| if(!ticking) { //Figure out someway to queue setTimeout callback fixes | |
| requestAnimationFrame(batchScrollActions); | |
| ticking = true; | |
| } | |
| } | |
| var batchScrollActions = function(){ | |
| /******* | |
| * Do your expensive thing here! | |
| ***/ | |
| ticking = false; | |
| }; | |
| window.addEventListener('scroll', onScroll, false); |
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