Created
June 6, 2012 06:31
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sessionStorage polyfill
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/* | |
* Based on: http://www.quirksmode.org/js/cookies.html | |
* and https://github.com/wojodesign/local-storage-js/blob/master/storage.js | |
* and https://gist.github.com/350433 | |
* License: http://www.opensource.org/licenses/MIT | |
*/ | |
(function(window) { | |
'use strict'; | |
window.sessionStorage = window.sessionStorage || { | |
length: 0, | |
setItem: function(key, value) { | |
document.cookie = key + '=' + value + '; path=/'; | |
this.length++; | |
}, | |
getItem: function(key) { | |
var keyEQ = key + '='; | |
var ca = document.cookie.split(';'); | |
for (var i = 0, len = ca.length; i < len; i++) { | |
var c = ca[i]; | |
while (c.charAt(0) === ' ') c = c.substring(1, c.length); | |
if (c.indexOf(keyEQ) === 0) return c.substring(keyEQ.length, c.length); | |
} | |
return null; | |
}, | |
removeItem: function(key) { | |
this.setItem(key, '', -1); | |
this.length--; | |
}, | |
clear: function() { | |
// Caution: will clear all persistent cookies as well | |
var ca = document.cookie.split(';'); | |
for (var i = 0, len = ca.length; i < len; i++) { | |
var c = ca[i]; | |
while (c.charAt(0) === ' ') c = c.substring(1, c.length); | |
var key = c.substring(0, c.indexOf('=')); | |
this.removeItem(key); | |
} | |
this.length = 0; | |
}, | |
key: function(n) { | |
var ca = document.cookie.split(';'); | |
if (n >= ca.length || isNaN(parseFloat(n)) || !isFinite(n)) return null; | |
var c = ca[n]; | |
while (c.charAt(0) === ' ') c = c.substring(1, c.length); | |
return c.substring(0, c.indexOf('=')); | |
} | |
}; | |
})(this); |
Not in my testing. They're cookies without an expiry date, so they (should) die when the browser closes.
For persistent storage, this localStorage polyfill seems to work well:
https://github.com/wojodesign/local-storage-js/blob/master/storage.js
Nice!
Firefox 14 tells me "TypeError: setting a property that has only a getter, key: function(n) {" when loading the script. Any ideas?
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Does it stick around after the session has ended?