javascript - trigger custom event without jQuery

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javascript - trigger custom event without jQuery

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

I'm triggering some DOM Events with jQuery triggerHandler()

<!DOCTYPE html>
<html>
<head>
  <title>stackoverflow</title>
  <script src="http://ajax.googleapis.com:80/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
</head>

<body>
  <script>
    $(document).ready(function() {
      $(document).on('hey', function(customEvent, originalEvent, data) {
        console.log(customEvent.type + ' ' + data.user); // hey stackoverflow

      });

      // how to this in vanilla js
      $(document).triggerHandler('hey', [{}, {
        'user': 'stackoverflow'
      }])
    });
  </script>
</body>

</html>

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:19:16+0000

If you want an exact replication of jQuery's behaviour, you're probably best off digging through the jQuery source code.

If you just want to do normal event dispatching and listening, see CustomEvent for how to dispatch an event with custom data and addEventListener for how to listen to it.

Your example would probably look something like

document.addEventListener('hey', function(customEvent)
{
    console.log(customEvent.type + ' ' + customEvent.detail.user); // hey stackoverflow
});
document.dispatchEvent(new CustomEvent('hey', {'detail': {'user': 'stackoverflow'}}));

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