Local Storage

local.js

function utmLocalstorageTag() {
    const queryString = window.location.search; //  url query string
    const urlParams = new URLSearchParams(queryString); // get parameters in  url
    // get required parameters for the LocalStorage management
    const utm_medium_value = urlParams.get('utm_medium');

    if (utm_medium_value) {
        const previousMediumValue = getItem("_utmMedium"); // check for previous UTM medium value in LocalStorage
        if (previousMediumValue) {
            const updated_utm_medium_value = previousMediumValue + ":" + utm_medium_value; // concat new utm_medium value to prev LocalStarage
            setItem("_utmMedium", updated_utm_medium_value);
        } else {
            setItem("_utmMedium", utm_medium_value); // create new _utmMedium LocalStarage

        }
    }
}

// create LocalStarage
function setItem(lname, lvalue) {

    localStorage.setItem(lname, lvalue);
}


// retrieve LocalStarage 
function getItem(lname) {
    if (lname) {
        return localStorage.getItem(lname);
    }
    return "";
}