Daniel Howard
83 linhas
2.7 KiB
JavaScript
83 linhas
2.7 KiB
JavaScript
// Storage API
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var 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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sessionStorageName = 'sessionStorage',
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localStorageName = 'localStorage',
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globalStorageName = 'globalStorage',
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storage
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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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function serialize(value) {
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return JSON.stringify(value)
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}
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function deserialize(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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if (sessionStorageName in win && win[sessionStorageName]) {
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storage = win[sessionStorageName]
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api.set = function(key, val) { storage[key] = serialize(val) }
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api.get = function(key) { return deserialize(storage[key]) }
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api.remove = function(key) { delete storage[key] }
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api.clear = function() { storage.clear() }
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} else if (localStorageName in win && win[localStorageName]) {
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storage = win[localStorageName]
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api.set = function(key, val) { storage[key] = serialize(val) }
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api.get = function(key) { return deserialize(storage[key]) }
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api.remove = function(key) { delete storage[key] }
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api.clear = function() { storage.clear() }
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} else if (globalStorageName in win && win[globalStorageName]) {
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storage = win[globalStorageName][win.location.hostname]
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api.set = function(key, val) { storage[key] = serialize(val) }
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api.get = function(key) { return 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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function getStorage() {
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if (storage) { return storage; }
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storage = doc.body.appendChild(doc.createElement('div'))
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storage.style.display = 'none'
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// See http://msdn.microsoft.com/en-us/library/ms531081(v=VS.85).aspx
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// and http://msdn.microsoft.com/en-us/library/ms531424(v=VS.85).aspx
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storage.addBehavior('#default#userData')
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storage.load(localStorageName)
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return storage;
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}
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api.set = function(key, val) {
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var storage = getStorage()
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storage.setAttribute(key, serialize(val))
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storage.save(localStorageName)
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}
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api.get = function(key) {
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var storage = getStorage()
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return deserialize(storage.getAttribute(key))
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}
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api.remove = function(key) {
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var storage = getStorage()
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storage.removeAttribute(key)
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storage.save(localStorageName)
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}
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api.clear = function() {
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var storage = getStorage()
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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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}
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return api
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})();
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