Create a gist now

Instantly share code, notes, and snippets.

What would you like to do?
/* Copyright (c) 2010 Marcus Westin
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
(function ($) {
var storage = function (name) {
var api = {},
win = window,
doc = win.document,
localStorageName = name,
globalStorageName = 'globalStorage',
storage;
api.disabled = false;
api.set = function (key, value) { };
api.get = function (key) { };
api.remove = function (key) { };
api.clear = function () { };
api.transact = function (key, transactionFn) {
var val = api.get(key);
if (typeof val == 'undefined') {
val = {};
}
transactionFn(val);
api.set(key, val);
};
api.serialize = function (value) {
return JSON.stringify(value);
};
api.deserialize = function (value) {
if (typeof value != 'string') { return undefined; }
return JSON.parse(value);
};
// Functions to encapsulate questionable FireFox 3.6.13 behavior
// when about.config::dom.storage.enabled === false
// See https://github.com/marcuswestin/store.js/issues#issue/13
function isLocalStorageNameSupported() {
try {
return (localStorageName in win && win[localStorageName]);
}
catch (err) {
return false;
}
}
function isGlobalStorageNameSupported() {
try {
return (globalStorageName in win && win[globalStorageName] && win[globalStorageName][win.location.hostname]);
}
catch (err) {
return false;
}
}
if (isLocalStorageNameSupported()) {
storage = win[localStorageName];
api.set = function (key, val) { storage.setItem(key, api.serialize(val)); };
api.get = function (key) { return api.deserialize(storage.getItem(key)); };
api.remove = function (key) { storage.removeItem(key); };
api.clear = function () { storage.clear(); };
} else if (isGlobalStorageNameSupported()) {
storage = win[globalStorageName][win.location.hostname];
api.set = function (key, val) { storage[key] = api.serialize(val); };
api.get = function (key) { return api.deserialize(storage[key] && storage[key].value); };
api.remove = function (key) { delete storage[key]; };
api.clear = function () { for (var key in storage) { delete storage[key]; } };
} else if (doc.documentElement.addBehavior) {
var storage = doc.createElement('div');
function withIEStorage(storeFunction) {
return function () {
var args = Array.prototype.slice.call(arguments, 0);
args.unshift(storage);
// See http://msdn.microsoft.com/en-us/library/ms531081(v=VS.85).aspx
// and http://msdn.microsoft.com/en-us/library/ms531424(v=VS.85).aspx
doc.body.appendChild(storage);
storage.addBehavior('#default#userData');
storage.load(localStorageName);
var result = storeFunction.apply(api, args);
doc.body.removeChild(storage);
return result;
};
}
api.set = withIEStorage(function (storage, key, val) {
storage.setAttribute(key, api.serialize(val));
storage.save(localStorageName);
});
api.get = withIEStorage(function (storage, key) {
return api.deserialize(storage.getAttribute(key));
});
api.remove = withIEStorage(function (storage, key) {
storage.removeAttribute(key);
storage.save(localStorageName);
});
api.clear = withIEStorage(function (storage) {
var attributes = storage.XMLDocument.documentElement.attributes;
storage.load(localStorageName);
for (var i = 0, attr; attr = attributes[i]; i++) {
storage.removeAttribute(attr.name);
}
storage.save(localStorageName);
});
} else {
api.disabled = true;
}
return api;
};
// Set jQuery variables.
$.localStorage = storage("localStorage");
$.sessionStorage = storage("sessionStorage");
}(jQuery));
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment