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- <!DOCTYPE html><html><head><title>Sencha Documentation Project</title><link rel="stylesheet" href="../reset.css" type="text/css"><link rel="stylesheet" href="../prettify.css" type="text/css"><link rel="stylesheet" href="../prettify_sa.css" type="text/css"><script type="text/javascript" src="../prettify.js"></script></head><body onload="prettyPrint()"><pre class="prettyprint"><pre><span id='Ext-data.proxy.WebStorage-method-constructor'><span id='Ext-data.proxy.WebStorage'>/**
- </span></span> * @author Ed Spencer
- * @class Ext.data.proxy.WebStorage
- * @extends Ext.data.proxy.Client
- *
- * <p>WebStorageProxy is simply a superclass for the {@link Ext.data.proxy.LocalStorage localStorage} and
- * {@link Ext.data.proxy.SessionStorage sessionStorage} proxies. It uses the new HTML5 key/value client-side storage
- * objects to save {@link Ext.data.Model model instances} for offline use.</p>
- *
- * @constructor
- * Creates the proxy, throws an error if local storage is not supported in the current browser
- * @param {Object} config Optional config object
- */
- Ext.define('Ext.data.proxy.WebStorage', {
- extend: 'Ext.data.proxy.Client',
- alternateClassName: 'Ext.data.WebStorageProxy',
-
- <span id='Ext-data.proxy.WebStorage-cfg-id'> /**
- </span> * @cfg {String} id The unique ID used as the key in which all record data are stored in the local storage object
- */
- id: undefined,
- <span id='Ext-data.proxy.WebStorage-method-constructor'> /**
- </span> * @ignore
- */
- constructor: function(config) {
- this.callParent(arguments);
-
- <span id='Ext-data.proxy.WebStorage-property-cache'> /**
- </span> * Cached map of records already retrieved by this Proxy - ensures that the same instance is always retrieved
- * @property cache
- * @type Object
- */
- this.cache = {};
- //<debug>
- if (this.getStorageObject() === undefined) {
- Ext.Error.raise("Local Storage is not supported in this browser, please use another type of data proxy");
- }
- //</debug>
- //if an id is not given, try to use the store's id instead
- this.id = this.id || (this.store ? this.store.storeId : undefined);
- //<debug>
- if (this.id === undefined) {
- Ext.Error.raise("No unique id was provided to the local storage proxy. See Ext.data.proxy.LocalStorage documentation for details");
- }
- //</debug>
- this.initialize();
- },
- //inherit docs
- create: function(operation, callback, scope) {
- var records = operation.records,
- length = records.length,
- ids = this.getIds(),
- id, record, i;
-
- operation.setStarted();
- for (i = 0; i < length; i++) {
- record = records[i];
- if (record.phantom) {
- record.phantom = false;
- id = this.getNextId();
- } else {
- id = record.getId();
- }
- this.setRecord(record, id);
- ids.push(id);
- }
- this.setIds(ids);
- operation.setCompleted();
- operation.setSuccessful();
- if (typeof callback == 'function') {
- callback.call(scope || this, operation);
- }
- },
- //inherit docs
- read: function(operation, callback, scope) {
- //TODO: respect sorters, filters, start and limit options on the Operation
- var records = [],
- ids = this.getIds(),
- length = ids.length,
- i, recordData, record;
-
- //read a single record
- if (operation.id) {
- record = this.getRecord(operation.id);
-
- if (record) {
- records.push(record);
- operation.setSuccessful();
- }
- } else {
- for (i = 0; i < length; i++) {
- records.push(this.getRecord(ids[i]));
- }
- operation.setSuccessful();
- }
-
- operation.setCompleted();
- operation.resultSet = Ext.create('Ext.data.ResultSet', {
- records: records,
- total : records.length,
- loaded : true
- });
- if (typeof callback == 'function') {
- callback.call(scope || this, operation);
- }
- },
- //inherit docs
- update: function(operation, callback, scope) {
- var records = operation.records,
- length = records.length,
- ids = this.getIds(),
- record, id, i;
- operation.setStarted();
- for (i = 0; i < length; i++) {
- record = records[i];
- this.setRecord(record);
-
- //we need to update the set of ids here because it's possible that a non-phantom record was added
- //to this proxy - in which case the record's id would never have been added via the normal 'create' call
- id = record.getId();
- if (id !== undefined && Ext.Array.indexOf(ids, id) == -1) {
- ids.push(id);
- }
- }
- this.setIds(ids);
- operation.setCompleted();
- operation.setSuccessful();
- if (typeof callback == 'function') {
- callback.call(scope || this, operation);
- }
- },
- //inherit
- destroy: function(operation, callback, scope) {
- var records = operation.records,
- length = records.length,
- ids = this.getIds(),
- //newIds is a copy of ids, from which we remove the destroyed records
- newIds = [].concat(ids),
- i;
- for (i = 0; i < length; i++) {
- Ext.Array.remove(newIds, records[i].getId());
- this.removeRecord(records[i], false);
- }
- this.setIds(newIds);
-
- operation.setCompleted();
- operation.setSuccessful();
- if (typeof callback == 'function') {
- callback.call(scope || this, operation);
- }
- },
- <span id='Ext-data.proxy.WebStorage-method-getRecord'> /**
- </span> * @private
- * Fetches a model instance from the Proxy by ID. Runs each field's decode function (if present) to decode the data
- * @param {String} id The record's unique ID
- * @return {Ext.data.Model} The model instance
- */
- getRecord: function(id) {
- if (this.cache[id] === undefined) {
- var rawData = Ext.decode(this.getStorageObject().getItem(this.getRecordKey(id))),
- data = {},
- Model = this.model,
- fields = Model.prototype.fields.items,
- length = fields.length,
- i, field, name, record;
- for (i = 0; i < length; i++) {
- field = fields[i];
- name = field.name;
- if (typeof field.decode == 'function') {
- data[name] = field.decode(rawData[name]);
- } else {
- data[name] = rawData[name];
- }
- }
- record = new Model(data, id);
- record.phantom = false;
- this.cache[id] = record;
- }
-
- return this.cache[id];
- },
- <span id='Ext-data.proxy.WebStorage-method-setRecord'> /**
- </span> * Saves the given record in the Proxy. Runs each field's encode function (if present) to encode the data
- * @param {Ext.data.Model} record The model instance
- * @param {String} id The id to save the record under (defaults to the value of the record's getId() function)
- */
- setRecord: function(record, id) {
- if (id) {
- record.setId(id);
- } else {
- id = record.getId();
- }
- var me = this,
- rawData = record.data,
- data = {},
- model = me.model,
- fields = model.prototype.fields.items,
- length = fields.length,
- i = 0,
- field, name, obj, key;
- for (; i < length; i++) {
- field = fields[i];
- name = field.name;
- if (typeof field.encode == 'function') {
- data[name] = field.encode(rawData[name], record);
- } else {
- data[name] = rawData[name];
- }
- }
- obj = me.getStorageObject();
- key = me.getRecordKey(id);
-
- //keep the cache up to date
- me.cache[id] = record;
-
- //iPad bug requires that we remove the item before setting it
- obj.removeItem(key);
- obj.setItem(key, Ext.encode(data));
- },
- <span id='Ext-data.proxy.WebStorage-method-removeRecord'> /**
- </span> * @private
- * Physically removes a given record from the local storage. Used internally by {@link #destroy}, which you should
- * use instead because it updates the list of currently-stored record ids
- * @param {String|Number|Ext.data.Model} id The id of the record to remove, or an Ext.data.Model instance
- */
- removeRecord: function(id, updateIds) {
- var me = this,
- ids;
-
- if (id.isModel) {
- id = id.getId();
- }
- if (updateIds !== false) {
- ids = me.getIds();
- Ext.Array.remove(ids, id);
- me.setIds(ids);
- }
- me.getStorageObject().removeItem(me.getRecordKey(id));
- },
- <span id='Ext-data.proxy.WebStorage-method-getRecordKey'> /**
- </span> * @private
- * Given the id of a record, returns a unique string based on that id and the id of this proxy. This is used when
- * storing data in the local storage object and should prevent naming collisions.
- * @param {String|Number|Ext.data.Model} id The record id, or a Model instance
- * @return {String} The unique key for this record
- */
- getRecordKey: function(id) {
- if (id.isModel) {
- id = id.getId();
- }
- return Ext.String.format("{0}-{1}", this.id, id);
- },
- <span id='Ext-data.proxy.WebStorage-method-getRecordCounterKey'> /**
- </span> * @private
- * Returns the unique key used to store the current record counter for this proxy. This is used internally when
- * realizing models (creating them when they used to be phantoms), in order to give each model instance a unique id.
- * @return {String} The counter key
- */
- getRecordCounterKey: function() {
- return Ext.String.format("{0}-counter", this.id);
- },
- <span id='Ext-data.proxy.WebStorage-method-getIds'> /**
- </span> * @private
- * Returns the array of record IDs stored in this Proxy
- * @return {Array} The record IDs. Each is cast as a Number
- */
- getIds: function() {
- var ids = (this.getStorageObject().getItem(this.id) || "").split(","),
- length = ids.length,
- i;
- if (length == 1 && ids[0] === "") {
- ids = [];
- } else {
- for (i = 0; i < length; i++) {
- ids[i] = parseInt(ids[i], 10);
- }
- }
- return ids;
- },
- <span id='Ext-data.proxy.WebStorage-method-setIds'> /**
- </span> * @private
- * Saves the array of ids representing the set of all records in the Proxy
- * @param {Array} ids The ids to set
- */
- setIds: function(ids) {
- var obj = this.getStorageObject(),
- str = ids.join(",");
-
- obj.removeItem(this.id);
-
- if (!Ext.isEmpty(str)) {
- obj.setItem(this.id, str);
- }
- },
- <span id='Ext-data.proxy.WebStorage-method-getNextId'> /**
- </span> * @private
- * Returns the next numerical ID that can be used when realizing a model instance (see getRecordCounterKey). Increments
- * the counter.
- * @return {Number} The id
- */
- getNextId: function() {
- var obj = this.getStorageObject(),
- key = this.getRecordCounterKey(),
- last = obj.getItem(key),
- ids, id;
-
- if (last === null) {
- ids = this.getIds();
- last = ids[ids.length - 1] || 0;
- }
-
- id = parseInt(last, 10) + 1;
- obj.setItem(key, id);
-
- return id;
- },
- <span id='Ext-data.proxy.WebStorage-method-initialize'> /**
- </span> * @private
- * Sets up the Proxy by claiming the key in the storage object that corresponds to the unique id of this Proxy. Called
- * automatically by the constructor, this should not need to be called again unless {@link #clear} has been called.
- */
- initialize: function() {
- var storageObject = this.getStorageObject();
- storageObject.setItem(this.id, storageObject.getItem(this.id) || "");
- },
- <span id='Ext-data.proxy.WebStorage-method-clear'> /**
- </span> * Destroys all records stored in the proxy and removes all keys and values used to support the proxy from the storage object
- */
- clear: function() {
- var obj = this.getStorageObject(),
- ids = this.getIds(),
- len = ids.length,
- i;
- //remove all the records
- for (i = 0; i < len; i++) {
- this.removeRecord(ids[i]);
- }
- //remove the supporting objects
- obj.removeItem(this.getRecordCounterKey());
- obj.removeItem(this.id);
- },
- <span id='Ext-data.proxy.WebStorage-method-getStorageObject'> /**
- </span> * @private
- * Abstract function which should return the storage object that data will be saved to. This must be implemented
- * in each subclass.
- * @return {Object} The storage object
- */
- getStorageObject: function() {
- //<debug>
- Ext.Error.raise("The getStorageObject function has not been defined in your Ext.data.proxy.WebStorage subclass");
- //</debug>
- }
- });</pre></pre></body></html>