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Why does requestAnimationFrame function accept an element as an argument?

原文 2011-09-20 15:26:40 9 1 javascript/ html5/ html5-canvas/ html5-animation/ requestanimationframe

I am just trying to understand why the hell window.requestAnimationFrame is accepting the second parameter as an element, what is the reason behind that?

I am curious to know the underlying execution for this function....

1 answers

It's added so that when an element is out of view (because of scrolling for example), the animation is not run.

From the specs :

Editorial note

ISSUE-4 Do we want to allow an Element to be passed to requestAnimationFrame, so that animations affecting the given element are throttled or paused when scrolled out of view?

More information about this issue can be found here .

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Related Question Why does datepicker() accept the argument 'getDate'? Why does jQuery accept an array as argument? requestAnimationFrame passing an argument to the function it is passed somehow? callback function as argument of window.requestAnimationFrame() Why a function in javascript does not accept undefined variable? Why does image disappear when using requestAnimationFrame? Why does millisecond counter keep going in requestAnimationFrame()? Why does this requestAnimationFrame setup fail to execute properly? JavaScript -WebdriverIO - function does not take the element as argument Requestanimationframe polyfill argument

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Why does requestAnimationFrame function accept an element as an argument?

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1 answers

solution1 13 ACCPTED 2011-09-20 15:32:59

solution1
13 ACCPTED 2011-09-20 15:32:59