JQuery DropDown Change Event Example

HTML

<!DOCTYPE html>
<body>
<form id="myform">

   <select id="dropdown_change">
 
      <option>--Select--</option>
      
      <option value="1">Option 1</option>
 
      <option value="2">Option 2</option>
 
      <option value="3">Option 3</option>
 
</select>
</form>
</body>
</html>

JavaScript

$(document).ready(function(){
     $("#dropdown_change").change(function(){
       if (document.getElementById("dropdown_change").value == "2")
       {
					$(this).css({"font-size" : "24px"});
       }
     });
   });