Get all shares for the current page using addthis shares.json endpoint

sharing_counter.js

A17.Behaviors.sharing_counter = function() {
  var url = document.querySelector("link[rel='canonical']").href;

  if(url) {
    var script = document.createElement('script');
    script.src = '//api-public.addthis.com/url/shares.json?url=' + url + '&callback=A17%2EHelpers%2Eupdate_counters';

    document.getElementsByTagName('head')[0].appendChild(script);
  }
};

A17.Helpers.update_counters = function(data) {
  if(data) {
    shares = data.shares;

    if(shares > 0) {
      var counters = document.querySelectorAll('[data-sharing-counter]');

      if(counters) {
        [].forEach.call(counters, function(counter) {
          counter.innerText = shares + " Shares";
        });
      }
    }
  }
}