GDPR: Add gaOptout() JavaScript function (and token optionally)

This module is on a very very good way to become a better alternative to Google Analytics module because it doesn't use inline Js and has a nice concept to support eu_cookie_compliance. By this it's a great candidate for GDPR compliance, which is very very hard to achieve with google_analytics.

Some years ago I wrote two issues that would help a lot for GDPR compliance - a JavaScript function (and for simple use eventually a token creating that link) to Opt-out from Google Analtics in the privacy policy text, which is a requirement in EU countries.

See:

• #2917905: Add JS-function / method to set ga-disable-... →
• #2249205: Add token for opt-out link →

So what we need is simply

• 
  

  var gaProperty = window.google_analytics_uacct;
  var disableStr = 'ga-disable-' + gaProperty;
  function gaOptout() {
    document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
    window[disableStr] = true;
  }

• 
  

  var gaProperty = window.google_analytics_uacct;
  var disableStr = 'ga-disable-' + gaProperty;
  if (document.cookie.indexOf(disableStr + '=true') > -1) {
    window[disableStr] = true;
    console.log('ga-disable is enabled, GA disabled.');
  }
  

• Show a confirmation message after opt-out - in a first step this could be a javascript alert
• Optionally: A token to call that function, e.g. "javascript:gaOptout(true);"
• Optionally: Prevent loading the ga script at all from the google server if the user opted-out (for even better GDPR compliance), like in #3011324: Integration with EU Cookie Compliance module →

I also wrote a short blog article about that some years ago... https://julian.pustkuchen.com/drupal-cms-google-analytics-gaoptout-daten...