allejo

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

allejo

var HelloMessage = React.createClass({
  render: function() {
    return <div tabIndex="1" onBlur={this.onBlur}>
    	Hello <input type="text" value="wat"/>
    </div>;
  },
  
  onBlur: function(e) {
    var currentTarget = e.currentTarget;

allejo

@function mapReverse ($map) {
    $result: null;

    @if type-of($map) == "map" {
        $keys: map-keys($map);
        $map-reversed: ();
        
        @for $i from length($keys) through 1 {
            $map-reversed: map-merge(
                $map-reversed,