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function getParam(p) { var match = RegExp('[?&]' + p + '=([^&]*)').exec(window.location.search); return match && decodeURIComponent(match[1].replace(/\+/g, ' ')); } function getExpiryRecord(value) { var expiryPeriod = 90 * 24 * 60 * 60 * 1000; // 90 day expiry in milliseconds var expiryDate = new Date().getTime() + expiryPeriod; return { value: value, expiryDate: expiryDate }; } function addGclid() { var gclidParam = getParam('gclid'); var gclidFormFields = ['gclid_field', 'foobar']; // all possible gclid form field ids here var gclidRecord = null; var currGclidFormField; var gclsrcParam = getParam('gclsrc'); var isGclsrcValid = !gclsrcParam || gclsrcParam.indexOf('aw') !== -1; gclidFormFields.forEach(function (field) { if (document.getElementById(field)) { currGclidFormField = document.getElementById(field); } }); if (gclidParam && isGclsrcValid) { gclidRecord = getExpiryRecord(gclidParam); localStorage.setItem('gclid', JSON.stringify(gclidRecord)); } var gclid = gclidRecord || JSON.parse(localStorage.getItem('gclid')); var isGclidValid = gclid && new Date().getTime() < gclid.expiryDate; if (currGclidFormField && isGclidValid) { currGclidFormField.value = gclid.value; } } window.addEventListener('load', addGclid);