jQuery addClass example
Change class name on click in jQuery
HTML
<form>
<input class="target" type="text" value="Field 1">
<select class="target">
<option value="option1" selected="selected">Option 1</option>
<option value="option2">Option 2</option>
</select>
</form>
<div id="other">
Trigger the handler
</div>
JavaScript
$( ".target" ).change(function() {
alert( "Handler for .change() called. " + $(this).val());
});