95 lines
3.0 KiB
JavaScript
95 lines
3.0 KiB
JavaScript
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jQuery.store = (function(){
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var api = {},
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win = window,
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doc = win.document,
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localStorageName = 'localStorage',
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globalStorageName = 'globalStorage',
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storage
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api.disabled = false
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api.set = function(key, value) {}
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api.get = function(key) {}
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api.remove = function(key) {}
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api.clear = function() {}
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api.transact = function(key, transactionFn) {
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var val = api.get(key)
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if (typeof val == 'undefined') { val = {} }
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transactionFn(val)
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api.set(key, val)
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}
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api.serialize = function(value) {
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return JSON.stringify(value)
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}
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api.deserialize = function(value) {
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if (typeof value != 'string') { return undefined }
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return JSON.parse(value)
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}
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// Functions to encapsulate questionable FireFox 3.6.13 behavior
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// when about.config::dom.storage.enabled === false
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// See https://github.com/marcuswestin/store.js/issues#issue/13
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function isLocalStorageNameSupported() {
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try { return (localStorageName in win && win[localStorageName]) }
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catch(err) { return false }
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}
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function isGlobalStorageNameSupported() {
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try { return (globalStorageName in win && win[globalStorageName] && win[globalStorageName][win.location.hostname]) }
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catch(err) { return false }
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}
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if (isLocalStorageNameSupported()) {
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storage = win[localStorageName]
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api.set = function(key, val) { storage.setItem(key, api.serialize(val)) }
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api.get = function(key) { return api.deserialize(storage.getItem(key)) }
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api.remove = function(key) { storage.removeItem(key) }
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api.clear = function() { storage.clear() }
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} else if (isGlobalStorageNameSupported()) {
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storage = win[globalStorageName][win.location.hostname]
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api.set = function(key, val) { storage[key] = api.serialize(val) }
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api.get = function(key) { return api.deserialize(storage[key] && storage[key].value) }
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api.remove = function(key) { delete storage[key] }
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api.clear = function() { for (var key in storage ) { delete storage[key] } }
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} else if (doc.documentElement.addBehavior) {
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var storage = doc.createElement('div')
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function withIEStorage(storeFunction) {
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return function() {
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var args = Array.prototype.slice.call(arguments, 0)
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args.unshift(storage)
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doc.body.appendChild(storage)
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storage.addBehavior('#default#userData')
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storage.load(localStorageName)
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var result = storeFunction.apply(api, args)
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doc.body.removeChild(storage)
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return result
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}
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}
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api.set = withIEStorage(function(storage, key, val) {
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storage.setAttribute(key, api.serialize(val))
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storage.save(localStorageName)
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})
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api.get = withIEStorage(function(storage, key) {
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return api.deserialize(storage.getAttribute(key))
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})
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api.remove = withIEStorage(function(storage, key) {
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storage.removeAttribute(key)
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storage.save(localStorageName)
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})
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api.clear = withIEStorage(function(storage) {
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var attributes = storage.XMLDocument.documentElement.attributes
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storage.load(localStorageName)
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for (var i=0, attr; attr = attributes[i]; i++) {
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storage.removeAttribute(attr.name)
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}
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storage.save(localStorageName)
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})
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} else {
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api.disabled = true
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}
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return api
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})();
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