https://eeba.org/Scripts/AjaxControlToolkit/Debug/ComponentSet.debug.js

1Sys.ComponentSet = function ComponentSet(elementSet, query, index) {
2    this._elementSet = elementSet || (elementSet = new Sys.ElementSet());
3    this._components = this._execute(elementSet, query, index);
4}
5
6Sys.ComponentSet.prototype = {
7    __class: true,
8    setProperties: function ComponentSet$setProperties(properties) {
9        // Sets properties on the matched components.
10        // "properties" - object with the names and values of the properties to set.
11        return this.each(function() {
12            Sys._set(this, properties);
13        });
14    },
15
16    get: function ComponentSet$get(index) {
17        // Returns the component at the specified index, or an array of all matches if not specified.
18        var components = this._components;
19
20        return (typeof (index) === "undefined") ? (Array.apply(null, components)) : (components[index || 0] || null);
21    },
22
23    each: function ComponentSet$each(callback) {
24        // Enumerate all the found components. The index of the component are passed as parameters to a callback. You may return 'false' to cancel the enumeration.
25        // "callback" - function called for each component.
26        foreach(this._components, function(c, i) {
27            if(callback.call(c, i) === false)
28                return true;
29        });
30
31        return this;
32    },
33
34    elements: function ComponentSet$elements() {
35        // Returns the underlying set of elements this component collection came from.
36        return this._elementSet;
37    },
38
39    _execute: function ComponentSet$_execute(elementSet, query, index) {
40        var components = [];
41        function match(c) {
42            var ctor;
43            return (c instanceof query) ||
44                ((ctor = c.constructor) && (
45                    (ctor === query) ||
46                    (ctor.inheritsFrom && ctor.inheritsFrom(query)) ||
47                    (ctor.implementsInterface && ctor.implementsInterface(query))));
48        }
49
50        if(query instanceof Array)
51            components.push.apply(components, query);
52        else
53            // query is a type or not set
54            elementSet.each(function() {
55                var c = this.control;
56
57                if(c && (!query || match(c)))
58                    components.push(c);
59
60                foreach(this._behaviors, function(b) {
61                    if(!query || match(b))
62                        components.push(b);
63                });
64            });
65
66        if((typeof (index) !== "undefined")) {
67            if(components[index])
68                components = [components[index]];
69            else
70                components = [];
71        }
72
73        return components;
74    }
75}