javascript - How to fires onClick event before onChange (even if the value has changed)?

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javascript - How to fires onClick event before onChange (even if the value has changed)?

posted Jan 31, 2022 in Technique[技术] by 深蓝 (71.8m points)

javascript - How to fires onClick event before onChange (even if the value has changed)?

Hello everyone and sorry for my english.

Following this jdfiddle, I have a problem I don't understand.

First I change the value of the input, then I click on the button and what I expected to see is "click" but I see "change" meaning onclick is called after onchange.

<input type="text" onChange="alert('change')" />
<button type="button" onClick="alert('click');">Click!</button>

I found on this post that it's because of chrome which fires onchange event before the onclick event. But I don't really have the same need as this post because my event are not declared in the same tag. And secondly, if I click on the button I would like to only execute the onclick function and not onclick and then onchange (this methods consists in using onMouseDown).

Do you have a good method to do that?

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1 Reply

深蓝 · Answer 1 · 2022-01-31T07:26:42+0000

Ok so I can see that you really wan't this. You could let the on change function run first, and then afterward see what has focus, if it is that button, you would know that it was clicked, and thus was the reason for loosing focus.

you cannot check this while the change function is running, as the body still has focus at this time..

<head>
  <script language="javascript">
  function focussed()
  {
    var triggerElement = document.activeElement
    alert(triggerElement)
    console.info(triggerElement)
  }

  function change()
  {
    alert("change")
    setTimeout(focussed, 1)
    return true
  }
  </script>

</head>
<body>
    <input type="text" onChange="alert('change')" />
    <button type="button" onClick="alert('click');">Click!</button>
</body>

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javascript - How to fires onClick event before onChange (even if the value has changed)?

javascript - How to fires onClick event before onChange (even if the value has changed)?

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