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Editorial Team
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Asked: 2026-05-13T11:24:46+00:00

I have a form with an onsubmit attribute. I need to bind a new

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I have a form with an onsubmit attribute. I need to bind a new submit event and I need this one to be executed before any existing submit functions.

The following code demonstrates the problem.

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Test</title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
    <script type="text/javascript">
      jQuery(function($) {
        // a plugin
        $('form').submit(function() {
          alert("Second");
        });
        // an other plugin
        $('form').submit(function() {
          alert("Third");
        });

        // this event must always be executed as first event
        $('form').submit(function() {
          alert("Always First");
        });
      });
    </script>
  </head>
  <body>
    <form onsubmit="javascript:alert('Fourth');">
      <p>
        <input type="submit">
      </p>
    </form>
  </body>
</html>

If you execute the script, first you get “Second”, then “First”.

Is is possible to bind a new submit event and specify whether the function must be called before any existing event?

Constraints:

  • Existing events must be preserved.
  • I can’t remove existing events because the content of the onsubmit attribute contains a quite complex logic written by Rails
  • (ADDED): the event should always be executed before any existing onsubmit event and already binded events (perhaps binded by an other plugin)

Any idea?

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1 Answer

  1. Editorial Team

    The inline submit event fires first, you could get a reference to it, nullify the onsubmit attribute on the form element, and then bind your new submit event, this one will execute your old submit handler:

      jQuery(function($) {
    var form = $('form'), oldSubmit = form[0].onsubmit;
    form[0].onsubmit = null;

    $('form').submit(function() {
      alert("First");
      oldSubmit.call(this); // preserve the context
    });
  });

    Note that I use the call method to invoke your old submit handler, this is to preserve the this keyword inside that function, it will be the form element itself.

    If your original onsubmit handler has some validation behavior, you can get its return value by var ret = oldSubmit.call(this);

    Check the above example here.

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