спрыгнуть в JavaScript Onchange
<select id="ddlFruits">
<option value=""></option>
<option value="1">Apple</option>
<option value="2">Mango</option>
<option value="3">Orange</option>
</select>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(function () {
$("#ddlFruits").change(function () {
var selectedText = $(this).find("option:selected").text();
var selectedValue = $(this).val();
alert("Selected Text: " + selectedText + " Value: " + selectedValue);
});
});
</script>
Ivan The Terrible