我想使用ajax php和jquery从3下拉过滤数据

i want to filter the data according selection of option from three drop down.

$(document).ready(function(){

var institute = $("#institute_wise").val();
var library_type = $("#library_type_wise").val();
var state = $("#state_wise").val();
if(institute=='Select' && library_type=='Select' && state=='Select')
{
        $("#load-a").load("get-filter-values.php?url=all");
        //$('#load-a').html("");
}

using any method . can anyone solve this problem.