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Editorial Team
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Asked: 2026-05-12T18:36:45+00:00

I’m trying to force a keypress inside a textfield using Javascript. This has to

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I’m trying to force a keypress inside a textfield using Javascript. This has to work specifically on IE but it simply doesn’t work.

Can anyone help me?

My test script is this one:

<html>
  <body>
  <input type="text" id="txtfld">
  <input type="button" onclick="go()">
  <script>
    function go() {
      var q = document.getElementById('txtfld');
      q.style.backgroundColor='yellow'; 
      q.focus();

      var evObj = document.createEventObject();
      evObj.keyCode = 84; // [T] key
      q.fireEvent('onkeypress', evObj);
    }
  </script>
  </body>
</html>
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1 Answer

  1. Editorial Team

    It’s not a good idea to try to drive browsers’ default-event-actions by faking events. In as much as it can be done at all it is browser-specific and unreliable.

    If you want to add a letter ‘t’ to the field, say so:

    q.value+= 't';

    In more complicated cases like if you want to insert a letter at the current cursor position, you need branching code for document.selection (IE) and field.selectionStart/End (others).

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