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August 27, 2015 13:01
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Throttle native browser events to the next animationFrame, mainly to calm 3rd party scripts down
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script> | |
| (function (window, Window) { | |
| var eventTypes = ['scroll', 'mousemove', 'touchmove'], | |
| eventTypesRegex = new RegExp(eventTypes.join("|")); | |
| eventTypes.forEach(function (type) { | |
| var running = false; | |
| var throttledEvent = new Event('throttled:' + type); | |
| window.addEventListener(type, function () { | |
| if (!running) { | |
| running = true; | |
| requestAnimationFrame(function () { | |
| window.dispatchEvent(throttledEvent); | |
| running = false; | |
| }); | |
| } | |
| }); | |
| }); | |
| var addEventListenerPrototype = Window.prototype.addEventListener; | |
| Window.prototype.addEventListener = function (type, fn, capture) { | |
| if (eventTypesRegex.test(type)) { | |
| console.log('Hijacking event listener: ' + type); | |
| type = 'throttled:' + type; | |
| } | |
| addEventListenerPrototype(type, fn, capture); | |
| }; | |
| })(window, Window); | |
| window.addEventListener('scroll', function (e) { | |
| console.log('scroll event cb, event is: ' + e.type); | |
| }); | |
| window.addEventListener('click', function (e) { | |
| console.log('click event cb, event is: ' + e.type); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> | |
| </body> | |
| </html> |
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