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]">
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?
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;
Is it possible to add an id reference to the form element and use document.getElementById?
Use document.getElementsByName("input_name") instead. Cross platform too. Win.
-- and in the old days (in HTML3.2/4.01 transitional/XHTML1.0 transitional DOM-binding) you could use:
form.elements["cache[m][2]"]
-- but the elements-stuff is, as Chris Pietschmann showed, not necessary as these binding-schemes also allow direct access (though I personally would prefer the extra readability !-)