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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
try {
if (!window.localStorage || !window.sessionStorage) {
throw new Error();
}
localStorage.setItem('storage_test', 1);
localStorage.removeItem('storage_test');
} catch (e) {
(function () {
'use strict';
/**
* Returns a storage object to shim local or sessionStorage
* @param {String} type - either 'local' or 'session'
*/
var Storage = function (type) {
var data;
/**
* Creates a cookie
* @param {String} name
* @param {String} value
* @param {Integer} days
*/
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=/';
}
/**
* Reads value of a cookie
* @param {String} name
*/
function readCookie(name) {
var nameEQ = name + '=',
ca = document.cookie.split(';'),
i = 0,
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;
}
/**
* Returns cookie name based upon the storage type.
* If this is session storage, the function returns a unique cookie per tab
*/
function getCookieName() {
if (type !== 'session') {
return 'localstorage';
}
if (!window.name) {
window.name = new Date().getTime();
}
return 'sessionStorage' + window.name;
}
/**
* Sets storage cookie to a data object
* @param {Object} dataObject
*/
function setData(dataObject) {
data = encodeURIComponent(JSON.stringify(dataObject));
createCookie(getCookieName(), data, 365);
}
/**
* Clears value of cookie data
*/
function clearData() {
createCookie(getCookieName(), '', 365);
}
/**
* @returns value of cookie data
*/
function getData() {
var dataResponse = readCookie(getCookieName());
return dataResponse ? JSON.parse(decodeURIComponent(dataResponse)) : {};
}
data = getData();
return {
length: 0,
/**
* Clears data from storage
*/
clear: function () {
data = {};
this.length = 0;
clearData();
},
/**
* Gets an item from storage
* @param {String} key
*/
getItem: function (key) {
return data[key] === undefined ? null : data[key];
},
/**
* Gets an item by index from storage
* @param {Integer} i
*/
key: function (i) {
var ctr = 0,
k;
for (k in data) {
if (data.hasOwnProperty(k)) {
// eslint-disable-next-line max-depth
if (ctr.toString() === i.toString()) {
return k;
}
ctr++;
}
}
return null;
},
/**
* Removes an item from storage
* @param {String} key
*/
removeItem: function (key) {
delete data[key];
this.length--;
setData(data);
},
/**
* Sets an item from storage
* @param {String} key
* @param {String} value
*/
setItem: function (key, value) {
data[key] = value.toString();
this.length++;
setData(data);
}
};
};
window.localStorage.prototype = window.localStorage = new Storage('local');
window.sessionStorage.prototype = window.sessionStorage = new Storage('session');
})();
}