Problem with Javascript not inputting value into hidden fields

Question

Maddening problem here.

When my page loads: <body onload="getClientDateTime();">

It runs this function: document.getElementById('ClientDateTime').value="hello world";

Which theoretically should insert "hello world" into a hidden field: <INPUT TYPE="hidden" name="ClientDateTime" id="ClientDateTime" value="">

But she no worky.

If I change the field to type "text" then it works like it should but not as a "hidden". Please help!

Works for me in FF on the mac with a blank slate webpage. You sure you're not doing something else wrong? — Mike Robinson
– Mike Robinson, Commented Oct 28, 2009 at 19:27
It does seem to work, at least on Firefox. Are you viewing the source to verify the value isn't changing? Depending on the browser you're using that may reload the page and show you the source before any javascript is executed. — Kaivosukeltaja
– Kaivosukeltaja, Commented Oct 28, 2009 at 19:29
I verify it by checking the page source after it has run and it's still blank. — TZERO
– TZERO, Commented Oct 28, 2009 at 19:32
This modification won't be reflected in the View Source as it is done with Javascript. So what you've done actually works, it is just that you are not using the correct method to verify it. — Darin Dimitrov
– Darin Dimitrov, Commented Oct 28, 2009 at 19:35

Darin Dimitrov · Accepted Answer · 2009-10-28 19:23:23Z

2

This actually works as it alerts the correct value:

<html>
<head>
    <title>Test</title>
</head>
<body onload="document.getElementById('ClientDateTime').value='hello world'; alert(document.getElementById('ClientDateTime').value);">

<input type="hidden" name="ClientDateTime" id="ClientDateTime" value="" />

</body>
</html>

answered Oct 28, 2009 at 19:23

Darin Dimitrov

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3 Comments

TZERO Over a year ago

Yes, that alerts the correct value, but the hidden field's value is still blank. So when I got to submit this form, there is nothing in there.

TZERO Over a year ago

Maybe just because the source code isnt' changed that it's still really in there? I'm going to run a test and see...

TZERO Over a year ago

Yep, it was actually changed, just not in the View Source. Thank you!

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