https://cdn.humanists.uk/wp-content/themes/humanistsuk-2023/build/js/utm.js?ver=2.00

1function saveUTM() {
2    // Don't overwrite an existing UTM cookie (first-touch attribution)
3    if (document.cookie.indexOf('humanistsuk_utm=') !== -1) {
4        cleanUpURL();
5        return;
6    }
7
8    if (!location.search) {
9        return;
10    }
11
12    var params = location.search.slice(1).split('&');
13    var validTerms = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content'];
14    var utm = {};
15
16    params.forEach(function (param) {
17        var parts = param.split('=');
18        if (parts.length === 2 && validTerms.indexOf(parts[0]) !== -1) {
19            try { utm[parts[0].replace('utm_', '')] = decodeURIComponent(parts[1]); }
20            catch (e) { utm[parts[0].replace('utm_', '')] = parts[1]; }
21        }
22    });
23
24    if (Object.keys(utm).length > 0) {
25        utm.landing_page = location.pathname;
26        var expires = new Date(Date.now() + 7776000000).toUTCString(); // 90 days
27        document.cookie = 'humanistsuk_utm=' + encodeURIComponent(JSON.stringify(utm)) + ';expires=' + expires + ';path=/;secure';
28    }
29
30    cleanUpURL();
31}
32
33function cleanUpURL() {
34    if (history && history.replaceState && location.search) {
35        var params = location.search.slice(1).split('&');
36        var newParams = params.filter(function (param) {
37            return param.slice(0, 4) !== 'utm_';
38        });
39        if (newParams.length < params.length) {
40            var search = newParams.length ? '?' + newParams.join('&') : '';
41            var url = location.pathname + search + location.hash;
42            history.replaceState(null, null, url);
43        }
44    }
45}
46
47saveUTM();