java - Get value from jsp drop down in servlet -

i have 2 drop down box , & second drop down depends on user has selected in first drop down(done using javascript). shown below:

first drop down:

    <div class="element">                     <label for="category">category </label>                     <select id='statecombo' onchange='statecombochange();'>     <option value='-1' title='-select one-'>-select one-</option>     <option value='0' title='mobile'>mobile</option>     <option value='1' title='nsw'>routers</option>     <option value='2' title='tas'>datacard</option> </select>                                         </div> 

second drop down:

                <div class="element">     <label for="category">sub-category </label>     <select id='citycombo' name="category" onchange='citycombochange();'>     <option value='-1' title='-select category first-'>-select category first-</option> </select>                 </div> 

now know how value particular field(say input tag) in servlet, use:

        request.getparameter("category"); 

but statement doesn't work drop down. shows me value=0, when save database. please me find above solution.

you have check javascript functions statecombochange() , citycombochange(). think functions changing options tag in unexpected way.

like above answer have change value="0" value="mobile" or have take out value tag .