JAVASCRIPT

onchange select dropdown jquery

$(function(){

 $("#status").change(function(){
     var status = this.value;
     alert(status);
   if(status=="1")
     $("#icon_class, #background_class").hide();// hide multiple sections
  });

});

dropdown option selection change event in jquery

$("select [name='element_name']").change(function(){
	// condition goes here
});