How to make a form to submit on the dropdown selection?

Hi
I have a form(jsp)that needs to call a servlet when a
value is selected in the dropdown list.
Does anyone have an idea on how that can be done?
Thank you!

Like this:
<form name="myform" action="http://myservleturl">
Select a person:
<select name="dropdown" onchange="javascript:myform.submit()">
<option>Dogbert
<option>Dilbert
<option>Wally
<option>Alice
</select>
</form>

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