Test for mobile via coffeescript

isMobile.coffee

Site = ->
  # @see: http://stackoverflow.com/a/20413768/622287
  _isHighDensity: ->
    ((window.matchMedia && (window.matchMedia('only screen and (min-resolution: 124dpi), only screen and (min-resolution: 1.3dppx), only screen and (min-resolution: 48.8dpcm)').matches || window.matchMedia('only screen and (-webkit-min-device-pixel-ratio: 1.3), only screen and (-o-min-device-pixel-ratio: 2.6/2), only screen and (min--moz-device-pixel-ratio: 1.3), only screen and (min-device-pixel-ratio: 1.3)').matches)) || (window.devicePixelRatio && window.devicePixelRatio > 1.3))

  _isRetina: ->
    ((window.matchMedia && (window.matchMedia('only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx), only screen and (min-resolution: 75.6dpcm)').matches || window.matchMedia('only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2/1), only screen and (min--moz-device-pixel-ratio: 2), only screen and (min-device-pixel-ratio: 2)').matches)) || (window.devicePixelRatio && window.devicePixelRatio > 2)) && /(iPad|iPhone|iPod)/g.test(navigator.userAgent)

  _checkMobile:
    webOS: ->
      /webOS/i.test(navigator.userAgent)
    Android: ->
      /Android/i.test(navigator.userAgent)
    BlackBerry: ->
      /BlackBerry/i.test(navigator.userAgent)
    iOS: ->
      /iPhone|iPad|iPod/i.test(navigator.userAgent)
    Opera: ->
      /Opera Mini/i.test(navigator.userAgent)
    Windows: ->
      /IEMobile/i.test(navigator.userAgent)

  isMobile: ->
    isMobile = false
    _.each @_checkMobile, (func, key) ->
      isMobile = key if func() is true
    isMobile


# Usage
site = new Site()
site.isMobile() # false or (string) e.g. 'iOS'

isMobile.js

var Site, site;

Site = function() {
  return {
    _isHighDensity: function() {
      return (window.matchMedia && (window.matchMedia('only screen and (min-resolution: 124dpi), only screen and (min-resolution: 1.3dppx), only screen and (min-resolution: 48.8dpcm)').matches || window.matchMedia('only screen and (-webkit-min-device-pixel-ratio: 1.3), only screen and (-o-min-device-pixel-ratio: 2.6/2), only screen and (min--moz-device-pixel-ratio: 1.3), only screen and (min-device-pixel-ratio: 1.3)').matches)) || (window.devicePixelRatio && window.devicePixelRatio > 1.3);
    },
    _isRetina: function() {
      return ((window.matchMedia && (window.matchMedia('only screen and (min-resolution: 192dpi), only screen and (min-resolution: 2dppx), only screen and (min-resolution: 75.6dpcm)').matches || window.matchMedia('only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2/1), only screen and (min--moz-device-pixel-ratio: 2), only screen and (min-device-pixel-ratio: 2)').matches)) || (window.devicePixelRatio && window.devicePixelRatio > 2)) && /(iPad|iPhone|iPod)/g.test(navigator.userAgent);
    },
    _checkMobile: {
      webOS: function() {
        return /webOS/i.test(navigator.userAgent);
      },
      Android: function() {
        return /Android/i.test(navigator.userAgent);
      },
      BlackBerry: function() {
        return /BlackBerry/i.test(navigator.userAgent);
      },
      iOS: function() {
        return /iPhone|iPad|iPod/i.test(navigator.userAgent);
      },
      Opera: function() {
        return /Opera Mini/i.test(navigator.userAgent);
      },
      Windows: function() {
        return /IEMobile/i.test(navigator.userAgent);
      }
    },
    isMobile: function() {
      var isMobile;
      isMobile = false;
      _.each(this._checkMobile, function(func, key) {
        if (func() === true) {
          return isMobile = key;
        }
      });
      return isMobile;
    }
  };
};

site = new Site();

site.isMobile();

// ---
// generated by coffee-script 1.9.2