reflow | 易学教程

Force browser to immediately repaint a dom element

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问题 I need to insert a huge html markup to some dom element which will take awhile. It is a reason why I want to display some preloader indicator. I have two blocks: #preloader and #container. Some code displays the preloader firstly and then starts to paste a big html markup. The problem - preloader hasn't really displayed until browser will not finish render html markup. I've tried a lot of solutions (a lot of them are described here) but still haven't success. An example is avalable below:

Force browser to immediately repaint a dom element

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I need to insert a huge html markup to some dom element which will take awhile. It is a reason why I want to display some preloader indicator. I have two blocks: #preloader and #container. Some code displays the preloader firstly and then starts to paste a big html markup. The problem - preloader hasn't really displayed until browser will not finish render html markup. I've tried a lot of solutions (a lot of them are described here ) but still haven't success. An example is avalable below: https://jsfiddle.net/f9f5atzu/ <div id='preloader'>Preloader...</div> <div id='container'>Container...<

Avoiding HTML document reflows

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I have several hundred "row" elements like this: <div class='row'> <div class='cell'></div> <div class='cell'></div> <div class='cell'></div> </div> I need to get their clientHeight after they have been rendered on the page already. I know that the "clientHeight" property forces a reflow and this kills my performance since there are so many of them. However - they are already rendered and I know that their size doesn't change between the time they are rendered and the time that I query for their height. Is there a way to tell the browser to NOT reflow when querying for the height ? Moreover -

Avoiding HTML document reflows

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问题 I have several hundred "row" elements like this: <div class='row'> <div class='cell'></div> <div class='cell'></div> <div class='cell'></div> </div> I need to get their clientHeight after they have been rendered on the page already. I know that the "clientHeight" property forces a reflow and this kills my performance since there are so many of them. However - they are already rendered and I know that their size doesn't change between the time they are rendered and the time that I query for

text-transform: uppercase causes layout error on Chrome

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I've run across a strange layout bug that appears to be triggered by the text-transform CSS property when an inline-block is nested within a block element. I saw the problem on Safari (5.1.2) as well, but this minimal test case only triggers on Chrome (17.0.963.56). The particularly interesting bit is that opening the developer tools and keeping it on the Elements tab triggers the correct layout. My best guess is that the combination of CSS rules and DOM structure is causing the webkit engine to miss performing a reflow of the page. <!DOCTYPE html> <html> <head> <title>Menu Widget Test</title>

text-transform: uppercase causes layout error on Chrome

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问题 I've run across a strange layout bug that appears to be triggered by the text-transform CSS property when an inline-block is nested within a block element. I saw the problem on Safari (5.1.2) as well, but this minimal test case only triggers on Chrome (17.0.963.56). The particularly interesting bit is that opening the developer tools and keeping it on the Elements tab triggers the correct layout. My best guess is that the combination of CSS rules and DOM structure is causing the webkit engine

Why does reflow need to be triggered for CSS transitions?

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I was reading this article http://semisignal.com/?p=5298 and the author wrote that "Reflow needs to be triggered before the invisible class is removed in order for the transition to work as expected. " My questions are : 1) Why does reflow need to be triggered? 2) I understand that we should avoid using reflow, if that is true why is the author suggesting to use reflow in order to make the transition work? 3) Instead of using reflow, is there a different method to make the transition work? Thank you. (Effectively: "Why can't I easily use transitions with the display property") Short Answer :

Force browser to trigger reflow while changing CSS

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I am building non-jQuery responsive image slider based on CSS3 transitions. The structure is simple: a viewport and inside relatively positioned UL with left floated LIs. I am facing a problem in such situation: User clicks "prev" arrow. JS appends proper LI before currently displayed LI node. For now UL has set CSS transition as none 0s linear to prevent animation changes. In this moment I decrease UL CSS left value by slider width (let's say: from 0px to -1200px) to make view the same as it was. Now I am changing UL's transition property to all 0.2s ease-out . Now I am changing UL's left

Why does reflow need to be triggered for CSS transitions?

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问题 I was reading this article http://semisignal.com/?p=5298 and the author wrote that "Reflow needs to be triggered before the invisible class is removed in order for the transition to work as expected. " My questions are : 1) Why does reflow need to be triggered? 2) I understand that we should avoid using reflow, if that is true why is the author suggesting to use reflow in order to make the transition work? 3) Instead of using reflow, is there a different method to make the transition work?

What's the difference between reflow and repaint?

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I'm a little unclear on the difference between reflow + repaint (if there's any difference at all) Seems like reflow might be shifting the position of various DOM elements, where repaint is just rendering a new object. E.g. reflow would occur when removing an element and repaint would occur when changing its color. Is this true? DVK This posting seems to cover the reflow vs repaint performance issues http://www.stubbornella.org/content/2009/03/27/reflows-repaints-css-performance-making-your-javascript-slow/ As for definitions, from that post: A repaint occurs when changes are made to an