https://www.premierhealth.com/Frontend-Assembly/Telerik.Sitefinity…?package=Bootstrap5&v=MTYzMjcxNDkwOQ%3d%3d

1var Querystring = function (qs) { // optionally pass a querystring to parse
2    this.params = {};
3    this.keys = [];
4
5    if (qs === null) qs = location.search.substring(1, location.search.length);
6    if (qs.length === 0) return;
7
8    // Turn <plus> back to <space>
9    // See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
10    qs = qs.replace(/\+/g, ' ');
11    var args = qs.split('&'); // parse out name/value pairs separated via &
12
13    // split out each name=value pair
14    for (var i = 0; i < args.length; i++) {
15        var currentElement = args[i];
16        var equalsIndex = currentElement.indexOf('=');
17        var name = currentElement.slice(0, equalsIndex);
18        var value = decodeURIComponent(currentElement.slice(equalsIndex + 1));
19
20        this.params[name] = value;
21        this.keys[i] = name;
22    }
23};
24
25Querystring.prototype = {
26    get: function (key, default_) {
27        var value = this.params[key.toLowerCase()];
28        return (value !== null) ? value : default_;
29    },
30
31    contains: function (key) {
32        var value = this.params[key.toLowerCase()];
33        return (value !== null);
34    },
35
36    set: function (key, value) {
37        var lowerKey = key.toLowerCase();
38        if (this.keys.indexOf(lowerKey) == -1) {
39            this.keys.push(lowerKey);
40        }
41        this.params[lowerKey] = value;
42    },
43
44    remove: function (key) {
45        var lowerKey = key.toLowerCase();
46        var index = this.keys.indexOf(lowerKey);
47        if (index > -1) {
48            this.keys.splice(index, 1);
49        }
50    },
51
52    toString: function (appendQuestionMark) {
53        if (this.keys.length > 0) {
54            var query = appendQuestionMark ? "?" : "";
55            for (var i = 0; i < this.keys.length; i++) {
56                if (i > 0)
57                    query += "&";
58                query += this.keys[i] + "=" + this.params[this.keys[i]];
59            }
60            return query;
61        }
62        return "";
63    }
64};