https://www.nichollsresidential.co.uk/components/com_eapow/assets/js/jcombo.js

1// jCombo v2.0
2// Carlos De Oliveira [email protected] (c) Feb 2013
3;(function ($, window, document, undefined) {
4	$.fn.jCombo = function(url, opt) {		
5		var defaults = {
6				parentField: null,
7				first_optval : "__jcombo__",
8				selected_value : "0",
9				initial_text: "-- Please Select --",
10				method: "GET",
11				dataType: "jsonp"								
12		};				
13		var opt = $.extend( defaults, opt) ;
14		var obj = $(this);
15		if(opt.parentField!=null) {
16			var $parentField = $(opt.parentField);			
17			$parentField.removeAttr("disabled","disabled");
18			$parentField.bind('change',  function(e) {
19				obj.attr("disabled","disabled");
20				if($(this).val() != opt.first_optval || globalParent != null) obj.removeAttr("disabled");
21				__render(	obj, { 
22					url: url, 
23					id: $(this).val(),
24					first_optval: opt.first_optval, 
25					initext: opt.initial_text, 
26					inival: opt.selected_value,
27					method: opt.method,
28					dataType: opt.dataType
29				});
30			});
31		} else __render(obj,{ 
32			url: url,
33			id: "",
34			first_optval: opt.first_optval,
35			initext: opt.initial_text,
36			inival: opt.selected_value,
37			method: opt.method,
38			dataType: opt.dataType
39		});					
40		function __render($obj,$options) {			
41            var parentColumn = (globalParent != null) ? globalParent.split('-') : (opt.parentField) ? opt.parentField.split('-') : '';
42			if($options.id==null) return false;
43            if(parentColumn){
44                parentColumn = parentColumn[2];
45            }
46            var locId = (globalParent != null) ? $(globalParent).val() : $options.id;
47			$.ajax({
48				type: $options.method,
49				dataType: $options.dataType,					
50				url: $options.url,
51                data: {
52                    parent: parentColumn,
53                    id: locId
54                },
55                error:function(){
56                    globalParent = (globalParent != null) ? globalParent : opt.parentField;
57                    var response = '<option value="" selected="selected">N/A</option>';
58					$obj.html(response);					           										
59					$obj.trigger("change");
60                },
61				success: function(data){
62                    globalParent = null;
63					var response = '<option value="' + $options.first_optval + '">' + $options.initext + '</option>';
64					var selected;
65					for(var index in data) {
66						selected = (index==$options.inival)?' selected="selected"':'';
67						response += '<option value="' + index + '"' + selected + '>' + data[index] + '</option>';
68					}
69					$obj.html(response);					           										
70					$obj.trigger("change");
71				}
72			});					
73		}
74	}
75})( jQuery, window, document );