OnChange & Hidden form element

[Christoph]

Is there any way you can trigger a function when the
value of a hidden form element is changed?

thnx,
Christoph

 

[David Dorward]

Is there any way you can trigger a function when the
value of a hidden form element is changed?

Events are only triggered by users. There is no way for a user to change the
content of a hidden field. Only a script can do this. Have that script fire
off whatever other functions you want.

 

[RobB]

Is there any way you can trigger a function when the
value of a hidden form element is changed?

thnx,
Christoph

The only way that seems to work is via the onpropertychange event
handler:

<input type="hidden".....onpropertychange="alert('changed')" />

....which is IE-only afaik. The entire concept of a 'change' event for a
hidden field is a bit shaky, as a change equals a value change followed
by a blur - and blur/focus for hidden fields is a seemingly invalid
concept. Since you can only change hidden fields programmatically
(script), presumably as the programmer you'd already know when you (as
opposed to a user) had changed the value...