javascript dropdownlist

I want to replace window.prompt with a textbox but it doesnt work,please help.

<script>
function addOption(Area){
oc = Area.options.length;
if(Area.selectedIndex==oc-1){
   newOpt = window.prompt("Enter Area","");
   if(newOpt+"">""){
     Area.options[oc] = new Option(Area.options[oc-1].text);
     Area.options[oc-1] = new Option(newOpt, newOpt, true, true);
   }
}
}
</script>
//dropdownlist
<select name="Area" id="Area" onchange="addOption(this)">
              <option value="Please Select">Please Select</option>
              <option value="Johannesburg">Johannesburg</option>
              <option value="Pretoria">Pretoria</option>
              <option value="Cape Town">Cape Town</option>
              <option value="Durban">Durban</option>
              <option value="Other Specify">Other Specify</option>
            </select>

View Answers

May 31, 2011 at 11:16 AM

<html>
<script>
function show(){
oc = Area.options.length;
if(Area.selectedIndex==oc-1){
document.getElementById('lab').style.visibility="visible";
document.getElementById('val').style.visibility="visible";
document.getElementById('b').style.visibility="visible";
   }
}
function addOption(){
oc = Area.options.length;
newOpt = document.getElementById('val').value;
Area.options[oc] = new Option(Area.options[oc-1].text);
Area.options[oc-1] = new Option(newOpt, newOpt, true, true);
document.getElementById('lab').style.visibility="hidden";
document.getElementById('val').style.visibility="hidden";
document.getElementById('b').style.visibility="hidden";
   }
</script>
<select name="Area" id="Area" onchange="show()">

              <option value="Please Select">Please Select</option>
              <option value="Johannesburg">Johannesburg</option>
              <option value="Pretoria">Pretoria</option>
              <option value="Cape Town">Cape Town</option>
              <option value="Durban">Durban</option>
              <option value="Other Specify">Other Specify</option>

            </select>
            <br><br>
            <label id="lab" style="visibility:hidden;">Enter Area</label><input style="visibility:hidden;" type="text" id="val" ><input type="button" id="b" style="visibility:hidden;" value="ok" onclick="addOption();">
</html>

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