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I found ngif will be block mousemove event #29323

huan-qi opened this Issue Mar 15, 2019 · 1 comment


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huan-qi commented Mar 15, 2019


<div #testDiv style="width: 1000px; height: 1000px; background-color: #808080">
  <canvas id="testCanvas"></canvas>

<div *ngFor="let data of testlist">
  <span *ngFor="let data of testlist">
    <span *ngIf=" != null"></span>


I tested mousemove this way. listening 'testDiv' mousemove event.
if i do not use ngif 锛宼he mousemove execution frequency is 16ms.
when i use the ngif , the mousemove execution frequency is 25ms.
if i subscribe to the mousemove event twice, the execution frequency will be 77ms.

my data length is 100.



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pkozlowski-opensource commented Mar 15, 2019

Thanks for reporting this issue. However, you didn't provide sufficient information for us to understand and reproduce the problem. Please check out our submission guidelines to understand why we can't act on issues that are lacking important information.

If the problem still exists in your application, please open a new issue and follow the instructions in the issue template.

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