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[BUG] CSS Transitions in JS

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  • #1

    [BUG] CSS Transitions in JS

    This bug was introduced in September 1st patch (http://www.dota2.com/reborn/updates#September1)

    Example:
    Code:
    panel.style.transition = "none;";
panel.style.width = "200px;";

panel.style.transition = "width 200ms linear 0ms;";
panel.style.width = "0px;";
    This code only works the first time.
    The second time the code tries to set the transition to "none", it simply doesn't work, and the panel keeps the transition that it already had.
    After that, the panel seems to bug out even more, and it doesn't matter what value you try to set to the transition, it just stops working.

    Let me know if you need more information.
    I also saw some people experiencing similar issues with other style properties like "position" or "margin", but I only tested with transitions.

    Thanks.
    Last edited by Tischel; 09-02-2015, 11:43 PM.
    Tags: None
  • #2
    I can confirm this. When testing with the transform property similar issues seem to be happening.
    It seems that the transform property is applied additively, meaning if there is a transform: translate(50px, 50px, 0px) and I then call panel.style.transform = 'translate(100px, 100px, 0px)' it will result in an actual translation of 150px, 150px.

    The Panorama debugger also gives some info on this: http://puu.sh/jYlR5/05cb97eedf.png

    My guess is that this patch: Fixed a bug where setting certain style properties via Javascript could stomp other properties (e.g. setting panel.style.x would stomp panel.style.y) Actually just adds the two property vectors together instead of selectively overriding one component.

    Example of what I think is happening:
    1) position.x = '30px' -> panel.position = '0px 0px 0px' + '30px 0px 0px' = '30px 0px 0px'
    2) position.x = '20px' -> panel.position = '30px 0px 0px' + '20px 0px 0px' = '50px 0px 0px'

    While this should be the intended behaviour:
    1) position.x = '30px' -> panel.position = '0px 0px 0px' - Modify x to 30px resulting in '30px 0px 0px'
    2) position.x = '20px' -> panel.position = '30px 0px 0px' - Modify x to 20px resulting in '20px 0px 0px'

    As far as I can see this behaviour affects most properties, possibly explaining any weird behaviour.
    Last edited by AgentP; 09-03-2015, 07:14 AM.

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    • #3
      bump. so i guess the transform behavior makes sense, but the position shouldn't be doing this.

      Comment

      • #4
        Bump

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