JS - Call and execute javascript functions by names by passing the function name as a string. Use case: Pass an event to ALL Google analytics properties on a page.

js-call-javascript-function-by-string.js

//http://stackoverflow.com/questions/359788/how-to-execute-a-javascript-function-when-i-have-its-name-as-a-string
// http://www.sitepoint.com/call-javascript-function-string-without-using-eval/
function executeFunctionByName(functionName, context, args) {
  var args = [].slice.call(arguments).splice(2);
  var namespaces = functionName.split(".");
  var func = namespaces.pop();
  for(var i = 0; i < namespaces.length; i++) {
    context = context[namespaces[i]];
  }
  return context[func].apply(this, args);
}


// Get the name of the Google Analytics object in case it was renamed by a plugin or something
// @link https://developers.google.com/analytics/devguides/collection/analyticsjs/renaming-the-ga-object
executeFunctionByName(window.GoogleAnalyticsObject, window, function(){
  var trackers = executeFunctionByName(window.GoogleAnalyticsObject+".getAll", window);
  for(var i =0; i < trackers.length; i++) {
    var name = trackers[i].get('name') + '.send';
    executeFunctionByName(window.GoogleAnalyticsObject, window, name, 'event', {
        'eventCategory': 'event-category-here',
        'eventAction': 'event-action-here',
        'eventLabel': 'event-label-here',
        'eventValue': 'event-value-here (change this into an actual number)'
      });
  }
});