/** * Proxy which uses HTML5 session storage as its data storage/retrieval mechanism. If this proxy * is used in a browser where session storage is not supported, the constructor will throw an error. * A session storage proxy requires a unique ID which is used as a key in which all record data * are stored in the session storage object. * * It's important to supply this unique ID as it cannot be reliably determined otherwise. If no id * is provided but the attached store has a storeId, the storeId will be used. If neither option * is presented the proxy will throw an error. * * Proxies are almost always used with a {@link Ext.data.Store store}: * * new Ext.data.Store({ * proxy: { * type: 'sessionstorage', * id: 'myProxyKey' * } * }); * * Alternatively you can instantiate the Proxy directly: * * new Ext.data.proxy.SessionStorage({ * id: 'myOtherProxyKey' * }); * * Note that session storage is different to local storage (see * {@link Ext.data.proxy.LocalStorage}) - if a browser session is ended (e.g. by closing * the browser) then all data in a SessionStorageProxy are lost. Browser restarts * don't affect the {@link Ext.data.proxy.LocalStorage} - the data are preserved. */Ext.define('Ext.data.proxy.SessionStorage', { extend: 'Ext.data.proxy.WebStorage', alias: 'proxy.sessionstorage', alternateClassName: 'Ext.data.SessionStorageProxy', getStorageObject: function() { return window.sessionStorage; }});