How To Check That A Form Has Been Changed

Apr 30, 2006

How do you detect that a form element has been changed? This thread:

http://groups.google.com/group/comp...25a82c9be127790

suggests that you attach onChange event handlers to every form element,
and when the handler fires you update a global 'isChanged' variable.
This technique seems to be a bit messy to me (I have many form
elements), I was thinking about storing the original form object in a
javascript variable when the body loads (in the bodie's onLoad event
handler), and upons submission, doing a javascript equality comparison
with the current form object. If nothing has changed, then the two
objects should be equal, right?

if(oldObject == document.getElementById('form'))
{
alert('has changed!');
}

Would this work?

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Simple Way To Check If Form Elements Have Changed

Oct 12, 2007

I have a form with many fields... the fields are getting values from a
database.

I've tried onunload to just submit the form regardless of changes or
not but onunload and submit isn't working for me. Now I need some
type of event that will fire when a user tries to navigate from a page
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(confirmation) to take action or not.

I know that the reset button only takes away anything that was added
to fields after the load so there must be some way to use the logic of
reset to simply check to see if fields have changed, right?

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