JS - Typeform - Pass UTM & Click ID (Google, Facebook, Microsoft) to Iframe

typeformparams.js

!function (window, document, undefined) {
    document.addEventListener('DOMContentLoaded', function() {
        var urlParams;
        var parser = document.createElement('a');
        var pattern = /utm_|gclid|fbclid|msclkid/i; 
        parser.href = window.location.href.replace('%20#', '?').toLowerCase();
        
        if (pattern.test(parser.href)) { // url contains utms
            var utms = window
            .location
            .search
            .replace('?','')
            .split('&')
            .reduce(
                function(p,e){
                    var a = e.split('=');
                    p[decodeURIComponent(a[0]).toLowerCase()] = decodeURIComponent(a[1]);
                    return p;
                },
                {}
            ); 
    
            // create params string
            urlParams = createUtmsparams(utms);
            
            if (typeof urlParams === 'undefined' || !urlParams) {
                return;
            } else {
                // find all links for changing
                var links = document.querySelectorAll("a");
                var i; var pattern = /typeform.com/; 
                for (i = 0; i < links.length; i++) {
                    var link = links[i].href;
                    // change typeform links only
                    if (pattern.test(link)) {
                        link = (link.indexOf('?') != -1) ? link + '&' : link.replace(/\/+$/, '') + '/?';
                        links[i].href = link + urlParams;
                    }
                }
            }
        }
    });
    
    function createUtmsparams (utms) {
        var checkObj = ['utm_campaign', 'utm_source', 'utm_medium', 'utm_conttent', 'utm_term', 'gclid', 'fbclid', 'msclkid'];
        var selfUtms = [];
        Object.keys(utms)
        .map(function(k) { 
            if (checkObj.includes(k)) { 
                selfUtms.push(encodeURIComponent(k) + '=' + encodeURIComponent(utms[k]));
            }
        });
        return selfUtms.join('&');
    }
}(window, document);