remy / gist:350433

Created March 31, 2010


    
    View gist:350433 
  
  
      gistfile1.js
    
    
        Raw
      
    
    File suppressed. Click to show.
  
  
            1
            2
            3
            4
            5
            6
            7
            8
            9
            10
            11
            12
            13
            14
            15
            16
            17
            18
            19
            20
            21
            22
            23
            24
            25
            26
            27
            28
            29
            30
            31
            32
            33
            34
            35
            36
            37
            38
            39
            40
            41
            42
            43
            44
            45
            46
            47
            48
            49
            50
            51
            52
            53
            54
            55
            56
            57
            58
            59
            60
            61
            62
            63
            64
            65
            66
            67
            68
            69
            70
            71
            72
            73
            74
            75
            76
            77
            78
            79
            80
            81
            82
            83
            84
            85
            86
            87
            88
            89
            90
            91
            92
            93
            94
            95
            96
          
          
            if (typeof window.localStorage == 'undefined' || typeof window.sessionStorage == 'undefined') (function () {
 
var Storage = function (type) {
  function createCookie(name, value, days) {
    var date, expires;
 
    if (days) {
      date = new Date();
      date.setTime(date.getTime()+(days*24*60*60*1000));
      expires = "; expires="+date.toGMTString();
    } else {
      expires = "";
    }
    document.cookie = name+"="+value+expires+"; path=/";
  }
 
  function readCookie(name) {
    var nameEQ = name + "=",
        ca = document.cookie.split(';'),
        i, c;
 
    for (i=0; i < ca.length; i++) {
      c = ca[i];
      while (c.charAt(0)==' ') {
        c = c.substring(1,c.length);
      }
 
      if (c.indexOf(nameEQ) == 0) {
        return c.substring(nameEQ.length,c.length);
      }
    }
    return null;
  }
  
  function setData(data) {
    data = JSON.stringify(data);
    if (type == 'session') {
      window.name = data;
    } else {
      createCookie('localStorage', data, 365);
    }
  }
  
  function clearData() {
    if (type == 'session') {
      window.name = '';
    } else {
      createCookie('localStorage', '', 365);
    }
  }
  
  function getData() {
    var data = type == 'session' ? window.name : readCookie('localStorage');
    return data ? JSON.parse(data) : {};
  }
 
 
  // initialise if there's already data
  var data = getData();
 
  return {
    length: 0,
    clear: function () {
      data = {};
      this.length = 0;
      clearData();
    },
    getItem: function (key) {
      return data[key] === undefined ? null : data[key];
    },
    key: function (i) {
      // not perfect, but works
      var ctr = 0;
      for (var k in data) {
        if (ctr == i) return k;
        else ctr++;
      }
      return null;
    },
    removeItem: function (key) {
      delete data[key];
      this.length--;
      setData(data);
    },
    setItem: function (key, value) {
      data[key] = value+''; // forces the value to a string
      this.length++;
      setData(data);
    }
  };
};
 
if (typeof window.localStorage == 'undefined') window.localStorage = new Storage('local');
if (typeof window.sessionStorage == 'undefined') window.sessionStorage = new Storage('session');
 
})();