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Asked: 2026-05-10T17:33:44+00:00

I have a form element that I want to address via javascript, but it

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I have a form element that I want to address via javascript, but it doesn’t like the syntax.

<form name='mycache'>   <input type='hidden' name='cache[m][2]'>   <!-- ... --> </form>

I want to be able to say:

document.mycache.cache[m][2]

but obviously I need to indicate that cache[m][2] is the whole name, and not an array reference to cache. Can it be done?

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  1. UPDATE: Actually, I was wrong, you can use [ or ] characters as part of a form elements id and/or name attribute.

    Here’s some code that proves it:

    <html> <body>  <form id='form1'>  <input type='test' id='field[m][2]' name='field[m][2]' value='Chris'/>  <input type='button' value='Test' onclick='showtest();'/>  <script type='text/javascript'> function showtest() {     var value = document.getElementById('field[m][2]').value;     alert(value); } </script>  </form>  </body> </html>

    Update: You can also use the following to get the value from the form element:

    var value = document.forms.form1['field[m][2]'].value;
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