https://www.podiuminfo.nl/js/selectbox.ajx.js

1//var root_directory2 = "http://localhost/_nieuwdesign/podiuminfo/html/";
2var root_directory2 = "https://www.podiuminfo.nl/";
3
4$(document).ready(function(){
5    //For every element start with id: "dd_search_" run the getDropDownData() function on click.
6    $('select[id^=dd_search_]').on('hover click mousedown mouseup touchstart touchmove', function(e){
7            getDropDownData($(this).attr('id')); 
8    });
9});
10
11
12function getDropDownData(from) {
13 setTimeout(function () {
14   if ($("#" + from).hasClass('loaded')) {
15        //Do nothing when the data is already loaded.
16    } else {
17		$("#" + from).addClass('loaded');
18		
19        $.getJSON(root_directory2 + "ajx/getDropDownData.php", {
20            from: from
21        }, function(ret) {
22  		   var result = "<option></option>";
23           $.each(ret['k'], function(index, value) {
24			  result += "<option value="+value+">"+ret['v'][index]+"</option>";									 
25           });
26		   
27		   $("#"+from).empty().append(result);
28        });
29    }
30	
31 	}, 0);
32}