Creating a session ID (e.g. in Google Tag Manager) for the Klar Pixel

Sometimes our customers are facing the situation that they don't have a sessionID in their Google Tag Manager data layer or in the frontend templates where they want to implement the Klar Pixel.

Here's an easy solution to this problem:

We're generating a unique ID that we store in session storage which can be used as cart- or checkoutID.

function() { 
  try { 
    // 1. Define the key name for storage 
    var storageKey = 'my_gtm_session_id';
    // 2. Check if the value exists in sessionStorage 
    var storedId =  cal  ca  sessionStorage.getItem(storageKey);
    // 3. If it exists, return the existing value 
    if (storedId) { return storedId; } 
    // 4. If not, generate the new ID 
    var newId = new Date().getTime() + '.' + Math.random().toString(36).substring(5); 
    // 5. Save it to sessionStorage 
    sessionStorage.setItem(storageKey, newId);
    // 6. Return the new value 
    return newId; 
  } catch (e) {
  // Fallback: If sessionStorage is disabled or full, generate a temporary ID 
    return new Date().getTime() + '.' + Math.random().toString(36).substring(5); 
  } 
}

In GTM you can place this code in a Custom JavaScript Variable and use it in all Klar Events:

Setting up the Klar Pixel via Tag Management System