causeway-standard-theme/causeway/js/components/global.js

(function (window, $) {
  'use strict';

  window.Causeway = {};

  // Detect IE8 (we don't support lowers versions)
  window.Causeway.isIe8 = false;
  window.Causeway.isIe9 = false;
  window.Causeway.isIe10 = false;
  window.Causeway.isIe11 = false;
  var html = $(html);

  switch (true) {
    case (navigator.appVersion.indexOf('MSIE 8.') !== -1):
      window.Causeway.isIe8 = true;
      html.addClass(' ie8');
      break;
    case (navigator.appVersion.indexOf('MSIE 9.') !== -1):
      window.Causeway.isIe9 = true;
      html.addClass(' ie9');
      break;
    case (!!navigator.userAgent.match(/MSIE 10/)):
      window.Causeway.isIe10 = true;
      html.addClass(' ie10');
      break;
    case (!!navigator.userAgent.match(/Trident.*rv[ :]*11\./)):
      window.Causeway.isIe11 = true;
      break;
  }

  window.Causeway.getDevice = function() {
    var device = '',
      innerWidth = window.innerWidth;
    switch (true) {
      case (innerWidth <= 480):
        device = "mobile";
        window.Causeway.isDevice = true;
        break;
      case (innerWidth > 480 && innerWidth <= 768):
        device = "tablet";
        window.Causeway.isDevice = true;
        break;
      case (innerWidth > 768 && innerWidth < 1200):
        device = "desktop";
        window.Causeway.isDevice = false;
        break;
      case (innerWidth >= 1200):
        device = "lg-desktop";
        window.Causeway.isDevice = false;
        break;
      default:
        device = "not found";
    }
    return device;
  };

  window.Causeway.isDevice = false;
  window.Causeway.getDevice();

}(window, jQuery));