Disabling submit button until dropdown menu used 1

[emozley]

Hi,

If I have a drop down menu...

<form name="form" method="post" action="go.asp">

<select name="UserID">
<option value="">Please Selectio</option>
<option value="1">Tom</option>
<option value="2">Dave</option>
<option value="3">Pete</option>
</select>

...and a submit button....

<input name="submitbutton" type="submit" value="Go">

</form>

...how can I disable the submit button if UserID is "" and enable it if it's 1, 2 or 3?

I guess I will have a function that is called using onChange and I suppose it will have something like form.submitbutton.disabled=true and form.submitbutton.disabled=false but beyond that I don't really know what I'm doing.

Thanks very much

Ed

 

[feherke]

Hi

<select name="UserID" [red]onchange="this.form.submitbutton.disabled=this.options[this.selectedIndex].value==''"[/red]>

<input name="submitbutton" type="submit" value="Go" [red]disabled="disabled"[/red]>

Feherke.

http://rootshell.be/~feherke/

 

[emozley]

That's great - thanks very much

Ed