First Party script voor verlagen unassigned shopify

<script type="text/javascript">
(function() {
    'use strict';
    
    // Generate UUID v4 (compatible method)
    function mkTagging_generateUUID() {
        // Fallback for older browsers without crypto API
        if (typeof crypto !== 'undefined' && crypto.getRandomValues) {
            return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, function(c) {
                return (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16);
            });
        } else {
            // Less secure fallback for very old browsers
            return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
                var r = Math.random() * 16 | 0;
                var v = c === 'x' ? r : (r & 0x3 | 0x8);
                return v.toString(16);
            });
        }
    }
    
    // Get cookie value by name
    function mkTagging_getCookie(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) === ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    }
    
    // Set cookie with expiration
    function mkTagging_setCookie(name, value, days) {
        var expires = "";
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            expires = "; expires=" + date.toUTCString();
        }
        // Set both path and SameSite for better compatibility
        document.cookie = name + "=" + value + expires + "; path=/; SameSite=Lax";
    }
    
    // Safe localStorage wrapper
    function mkTagging_getLocalStorage(key) {
        try {
            if (typeof Storage !== 'undefined' && window.localStorage) {
                return localStorage.getItem(key);
            }
        } catch (e) {
            // localStorage might be blocked or unavailable
            console.log('localStorage not available:', e);
        }
        return null;
    }
    
    function mkTagging_setLocalStorage(key, value) {
        try {
            if (typeof Storage !== 'undefined' && window.localStorage) {
                localStorage.setItem(key, value);
                return true;
            }
        } catch (e) {
            // localStorage might be blocked or unavailable
            console.log('localStorage not available:', e);
        }
        return false;
    }
    
    // Main initialization function
    function mkTagging_initVisitorId() {
        var cookieName = '_taggingmk';
        var storageKey = '_taggingmk_backup';
        var visitorId = null;
        
        // 1. Check if cookie exists
        visitorId = mkTagging_getCookie(cookieName);
        
        // 2. If no cookie, check localStorage backup
        if (!visitorId) {
            visitorId = mkTagging_getLocalStorage(storageKey);
            
            // If found in localStorage but not in cookie, restore the cookie
            if (visitorId) {
                mkTagging_setCookie(cookieName, visitorId, 365);
                console.log('MK Tagging: Visitor ID restored from localStorage:', visitorId);
            }
        }
        
        // 3. If still no ID, generate a new one
        if (!visitorId) {
            visitorId = mkTagging_generateUUID();
            mkTagging_setCookie(cookieName, visitorId, 365);
            console.log('MK Tagging: New visitor ID generated:', visitorId);
        }
        
        // 4. Always sync to localStorage as backup (if available)
        if (mkTagging_setLocalStorage(storageKey, visitorId)) {
            console.log('MK Tagging: Visitor ID backed up to localStorage');
        }
        
        // Return the visitor ID for potential use
        return visitorId;
    }
    
    // Run on DOM ready or immediately if already loaded
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', mkTagging_initVisitorId);
    } else {
        // DOM is already loaded
        mkTagging_initVisitorId();
    }
    
    // Create a namespaced object for any exposed functionality
    window.mkTagging = window.mkTagging || {};
    window.mkTagging.getVisitorId = function() {
        return mkTagging_getCookie('_taggingmk') || mkTagging_getLocalStorage('_taggingmk_backup');
    };
    
})();
</script>

Bijgewerkt op: 25/08/2025