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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; | |
})(); | |
} |
Works like a charm for me, we only have to remove the typo @bigotilda noticed !
Nice! This method is working correctly in Safari Private Mode. Thanks
you rock!,..... you're the man! Thanks.
I created a working one based on this.
Just what I was looking for.
The method really works. I was just looking for something like this. I have never worked with the Safari browser at all and I recently had to get acquainted with it. I also read about private browsing safari, a friend sent me some informative information https://moonlock.com/private-browsing-safari and by the way, now I only use safari! It's really very minimalistic and comfortable. It also turns out to be well protected.
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Warning - this polyfill will fail in many browsers
Even with the try/catch block, localStorage will still be broken in many cases. When it is disabled due to some privacy settings, any attempts to access
window.localStorage
orsetItem()
getItem()
methods will throw exceptions, regardless of the polyfill.Here are some notable examples where it breaks:
The only reasonable workaround is using a wrapper instead of relying on
window.localStorage
function.