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See http://www.w3.org/2001/12/DOM-Level-2-issues#i16 

and the original raised issue:
http://lists.w3.org/Archives/Public/www-dom/2001OctDec/0150.html 

~Justin Wood (Callek)

Rachael Hurd wrote:

> Can someone inform me about the background of the onsubmit HTML event 
> and submit() JS method? Reason I ask is because I notice when the 
> submit method is executed in JS, the onsubmit HTML event is not 
> executed. The following code below was a piece of sample code I 
> created to test this theory (test-JSsubmit-finish.asp was just a page 
> that contained ?Hello? on it; nothing really important).
>
> Was this functionality created on purpose by W3C (I'm assuming the 
> onsubmit HTML event came before the submit() method in JS)? If so, why?
>
> Thank you.
>
> Rachael Hurd
>
> ------------------------------------
>
> [CODE]
>
> <html>
>
> <head>
>
> <title>Testing Whether a Submit Event in JS runs the OnSubmit HTML 
> Event</title>
>
> <script type="text/javascript">
>
> function validateParameters()
>
> {
>
> var x = document.forms.item(0).Number1.value;
>
> if (x != 3)
>
> {alert('SILLY! ' + x + ' is not equal to 3'); return false;}
>
> else
>
> {alert('The number you entered is equal to 3!'); return true;}
>
> }
>
> function checkBoxAndSubmit()
>
> {
>
> document.forms.item(0).Checkbox1.checked=true;
>
> document.form01.submit();
>
> }
>
> </script>
>
> <body>
>
> <h3>Testing Whether a Submit Event in JS runs the OnSubmit HTML Event</h3>
>
> <br />
>
> <form name="form01" id="form01" 
> action="/Hospital/Tests/test-JSsubmit-finish.asp" method="post" 
> onsubmit="return validateParameters(4);">
>
> <input type="checkbox" name="Checkbox1" id="Checkbox1" 
> onclick="checkBoxAndSubmit();" />
>
> <input type="text" name="Number1" value="Enter a Number"/>
>
> <input type="submit" name="SubmitButton" value="Submit">
>
> </form>
>
> </body>
>
> </html>
>
> [/CODE]
>

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Re: Question about onsubmit HTML event and submit JS method