The below code snippet explains how to set selectedIndex of HTML Select Dropdown using jQuery
<select id="mySelect">
<option value="1">Yes</option>
<option value="2">No</option>
</select>
<input type="button" id="demo" value = "Demo" />
<script type = "text/javascript" src = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$("#demo").live("click", function () {
//Set the selectedIndex
$("#mySelect")[0].selectedIndex = 1;
});
</script>
Explanation:
The button with ID demo is attached with a click event. When the button is clicked the selectedIndex of the HTML Select Dropdown with ID mySelect is set using jQuery