how can i send a request to a servlet without submitting the whole form

[Nadine Hossam]

Hi,
I have a form in a JSP, this form has 2 combo boxes. the second combo box will be empty until the user choose a value from the first combobox.

so I have the select tag as follows in the jsp

<select name="country" id="firstBox" onchange="retreiveSecondList()">
<option value="" SELECTED>
......
</select>

and defined a js function

function retreiveSecondList(){
firstBox = document.getElementById('firstBox');
//Nothing selected
if(firstBox.selectedIndex==0){
return;
}

selectedOption = firstBox.options[firstBox.selectedIndex].value;
url="/BS/RegisterServlet?selectedOption="+firstBox.selectedIndex;


}
how can I send a request through this method having the selected index from the first combobox?

i have tried
req = new HttpServletRequest();
req.open("GET", url, true);
req.send();

but it s not working!!!
anyone has any idea about that?

[Eric Pascarello]

And what is this function look like: HttpServletRequest();

Eric