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85 lines
1.9 KiB
JavaScript
85 lines
1.9 KiB
JavaScript
'use strict';
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/**
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* Checks localStorage and provides a fallback if it doesn't exist or is disabled
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*/
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define('storage', function () {
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function Storage() {
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this._store = {};
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this._keys = [];
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}
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Storage.prototype.isMock = true;
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Storage.prototype.setItem = function (key, val) {
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key = String(key);
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if (this._keys.indexOf(key) === -1) {
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this._keys.push(key);
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}
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this._store[key] = val;
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};
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Storage.prototype.getItem = function (key) {
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key = String(key);
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if (this._keys.indexOf(key) === -1) {
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return null;
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}
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return this._store[key];
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};
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Storage.prototype.removeItem = function (key) {
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key = String(key);
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this._keys = this._keys.filter(function (x) {
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return x !== key;
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});
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this._store[key] = null;
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};
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Storage.prototype.clear = function () {
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this._keys = [];
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this._store = {};
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};
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Storage.prototype.key = function (n) {
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n = parseInt(n, 10) || 0;
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return this._keys[n];
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};
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if (Object.defineProperty) {
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Object.defineProperty(Storage.prototype, 'length', {
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get: function () {
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return this._keys.length;
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},
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});
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}
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let storage;
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const item = Date.now().toString();
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try {
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storage = window.localStorage;
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storage.setItem(item, item);
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if (storage.getItem(item) !== item) {
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throw Error('localStorage behaved unexpectedly');
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}
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storage.removeItem(item);
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return storage;
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} catch (e) {
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console.warn(e);
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console.warn('localStorage failed, falling back on sessionStorage');
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// see if sessionStorage works, and if so, return that
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try {
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storage = window.sessionStorage;
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storage.setItem(item, item);
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if (storage.getItem(item) !== item) {
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throw Error('sessionStorage behaved unexpectedly');
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}
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storage.removeItem(item);
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return storage;
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} catch (e) {
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console.warn(e);
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console.warn('sessionStorage failed, falling back on memory storage');
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// return an object implementing mock methods
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return new Storage();
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}
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}
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});
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