選択項目の最後の項目を取得

Question

ASPで選択したHTML要素の最後の項目を取得するにはどうすればよいですか？

<select id="AggregationLevel" name="AggregationLevel" onchange="javascript:SF(true)"> 


           <option value="1">Monthly</option> 

           <option value="2">Weekly</option> 

           <option selected='selected' value="3">Daily</option> 


       </select> 

Answer 1

var i = document.getElementById("AggregationLevel").options.length; 
var j = document.getElementById("AggregationLevel").selectedIndex; 
alert(document.getElementById("AggregationLevel").options[i-1].value); // last item 
alert(document.getElementById("AggregationLevel").options[j].value); // selected item, if this is what you're interested in