https://www.marcellasappliance.com/js/compare.js?ccid=x6088659

1var ItemComparator = (function() {
2    // Global Constants
3    var MIN_ITEMS = 2;
4    var MAX_ITEMS = 4;
5	
6    // Private Variables
7    var keys = [];
8    var idx = 0; // loop variable
9
10    // Private methods
11    function addToCompare(item_key) {
12        if (! item_key) return;
13        item_key = item_key.toUpperCase();
14        for (idx = 0; idx < keys.length; idx++) {
15            // Already here?
16            if (keys[idx] == item_key) return;
17        }
18        // New, so add
19        keys.push(item_key);
20		setCookie();
21    }
22
23    function removeFromCompare(item_key) {
24        if (! item_key) return;
25        item_key = item_key.toUpperCase();
26        for (idx = 0; idx < keys.length; idx++) {
27            if (keys[idx] == item_key) {
28                // Create new copy of keys without specified item
29                keys = keys.slice(0, idx).concat(keys.slice(idx + 1));
30				setCookie();
31                return;
32            };
33        }
34    }
35	
36	function setCookie() {
37		var now = new Date();
38		var time = now.getTime();
39		var expireTime = time + (5 * 60 * 1000);
40		now.setTime(expireTime);
41		document.cookie = 'item_keys='+JSON.stringify(keys)+';cookie=ok;expires='+now.toGMTString()+';path=/';
42	}
43
44    function toggleVisibility(element) {
45        if (! element) return;
46        if (-1 != element.className.indexOf("hidden")) {
47            element.className = element.className.replace("hidden", "");
48        } else {
49            element.className += " hidden";
50        }
51    }
52
53    function toggleSpanTags(checkbox) {
54        if (! checkbox) return;
55        // 1) Find sibling <label>s
56        // 2) Toggle each <span> inside <label>
57        var siblings = checkbox.parentNode.childNodes;
58        for (var idx = 0; idx < siblings.length; idx++) {
59            if ("LABEL" != siblings[idx].tagName) continue;
60            var label = siblings[idx];
61
62            for (var sub_idx = 0; sub_idx < label.childNodes.length; sub_idx++) {
63                var el = label.childNodes[sub_idx];
64                if ("SPAN" != el.tagName) continue;
65                toggleVisibility(el);
66            }
67        }        
68    }
69
70    // return object
71    var comparator = {};
72
73    // public
74    comparator.compare = function() {
75        if (keys.length < MIN_ITEMS) {
76            alert("You must select at least " + MIN_ITEMS + " items to compare");
77            return;
78        }
79        if (keys.length > MAX_ITEMS) {
80            alert("You cannot select more than " + MAX_ITEMS + " items to compare");
81            return;
82        }
83
84		var old_keys = keys;
85		keys = [];
86		setCookie();
87        document.location = '/_CGI/COMPARE.HTML?PN=' + old_keys.join('|');
88    }
89
90    comparator.toggleCompare = function(checkbox, item_key) {
91        if (! checkbox || ! item_key) return;
92        if (checkbox.checked) {
93            addToCompare(item_key);
94        } else {
95            removeFromCompare(item_key);
96        }
97        toggleSpanTags(checkbox);
98    }
99	
100	function getCompareCookie() {
101		return (document.cookie.match(/^(?:.*;

101)?\s*item_keys\s*=\s*([^;]+)(?:.*)?$/)||[,null])[1]
102	}
103
104    comparator.scanForCheckedCompares = function() {
105		var cookie = getCompareCookie();
106		if (cookie == null) {
107			//Need anything here?
108		} else {
109			keys = JSON.parse(cookie);
110		}
111
112        var inputs = document.getElementsByTagName("input");
113        for (var idx = 0; idx < inputs.length; idx++) {
114            var input = inputs[idx];
115            if ("checkbox" == input.type) {
116                // Assume default state is unchecked
117                if (input.checked) {
118                    input.click();
119                }
120            }
121        }
122    }
123    return comparator;
124})();
125
126// Expose global functions
127var compare = ItemComparator.compare;
128var toggleCompare = ItemComparator.toggleCompare;
129
130// Scan for already checked items (set by browser in refresh or back button) and set appropriately
131document.addEventListener('DOMContentLoaded', () => {
132    ItemComparator.scanForCheckedCompares();
133})