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LocalStorage/SessionStorage Polyfill with Safari Private Browsing support.
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| // Refer to https://gist.github.com/remy/350433 | |
| try { | |
| // Test webstorage existence. | |
| if (!window.localStorage || !window.sessionStorage) throw "exception"; | |
| // Test webstorage accessibility - Needed for Safari private browsing. | |
| localStorage.setItem('storage_test', 1); | |
| localStorage.removeItem('storage_test'); | |
| } catch(e) { | |
| (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); 2480 | |
| } | |
| if (c.indexOf(nameEQ) == 0) { | |
| return c.substring(nameEQ.length,c.length); | |
| } | |
| } | |
| return null; | |
| } | |
| function setData(data) { | |
| // Convert data into JSON and encode to accommodate for special characters. | |
| data = encodeURIComponent(JSON.stringify(data)); | |
| // Create cookie. | |
| if (type == 'session') { | |
| createCookie(getSessionName(), data, 365); | |
| } else { | |
| createCookie('localStorage', data, 365); | |
| } | |
| } | |
| function clearData() { | |
| if (type == 'session') { | |
| createCookie(getSessionName(), '', 365); | |
| } else { | |
| createCookie('localStorage', '', 365); | |
| } | |
| } | |
| function getData() { | |
| // Get cookie data. | |
| var data = type == 'session' ? readCookie(getSessionName()) : readCookie('localStorage'); | |
| // If we have some data decode, parse and return it. | |
| return data ? JSON.parse(decodeURIComponent(data)) : {}; | |
| } | |
| function getSessionName() { | |
| // If there is no name for this window, set one. | |
| // To ensure it's unquie use the current timestamp. | |
| if(!window.name) { | |
| window.name = new Date().getTime(); | |
| } | |
| return 'sessionStorage' + window.name; | |
| } | |
| // 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); | |
| } | |
| }; | |
| }; | |
| // Replace window.localStorage and window.sessionStorage with out custom | |
| // implementation. | |
| var localStorage = new Storage('local'); | |
| var sessionStorage = new Storage('session'); | |
| window.localStorage = localStorage; | |
| window.sessionStorage = sessionStorage; | |
| // For Safari private browsing need to also set the proto value. | |
| window.localStorage.__proto__ = localStorage; | |
| window.sessionStorage.__proto__ = sessionStorage; | |
| })(); | |
| } |
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