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How to determine which button/menu cause a submit

 
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I have two menus which autosubmits a form whenever the user selects an item. I want an if statement which determines which menu submited the form. I do now know how to implement this one though. If you know some way to do this please let me know. Thanks...


--------------------------------------------------------
<select name="Menu1" onchange ="document.form3.submit()">
<%
if(request.getParameter("select2").equals("2")){
out.println(" <option>2</option> <option>1</option>");

}//if
else{
out.println(" <option>1</option> <option>2</option>");
}//else

%>

</select>

<select name="Menu2" onchange ="document.form3.submit()">

</select>

--problem code below. I do now know how to implement the code below--
<%
if(Menu1 submited the form)
do this

if(Menu2 submited the form)
do this

%>
 
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Use a hidden input type to determine who submits...

 
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