www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/data/ArrayReader.js
/* * Ext JS Library 2.0.2 * Copyright(c) 2006-2008, Ext JS, LLC. * licensing@extjs.com * * http://extjs.com/license */ /** * @class Ext.data.ArrayReader * @extends Ext.data.JsonReader * Data reader class to create an Array of Ext.data.Record objects from an Array. * Each element of that Array represents a row of data fields. The * fields are pulled into a Record object using as a subscript, the <em>mapping</em> property * of the field definition if it exists, or the field's ordinal position in the definition.<br> * <p> * Example code:. * <pre><code> var Employee = Ext.data.Record.create([ {name: 'name', mapping: 1}, // "mapping" only needed if an "id" field is present which {name: 'occupation', mapping: 2} // precludes using the ordinal position as the index. ]); var myReader = new Ext.data.ArrayReader({ id: 0 // The subscript within row Array that provides an ID for the Record (optional) }, Employee); </code></pre> * <p> * This would consume an Array like this: * <pre><code> [ [1, 'Bill', 'Gardener'], [2, 'Ben', 'Horticulturalist'] ] </code></pre> * @cfg {String} id (optional) The subscript within row Array that provides an ID for the Record * @constructor * Create a new ArrayReader * @param {Object} meta Metadata configuration options. * @param {Object} recordType Either an Array of field definition objects * as specified to {@link Ext.data.Record#create}, * or a {@link Ext.data.Record Record} constructor * created using {@link Ext.data.Record#create}. */ Ext.data.ArrayReader = Ext.extend(Ext.data.JsonReader, { /** * Create a data block containing Ext.data.Records from an XML document. * @param {Object} o An Array of row objects which represents the dataset. * @return {Object} data A data block which is used by an Ext.data.Store object as * a cache of Ext.data.Records. */ readRecords : function(o){ var sid = this.meta ? this.meta.id : null; var recordType = this.recordType, fields = recordType.prototype.fields; var records = []; var root = o; for(var i = 0; i < root.length; i++){ var n = root[i]; var values = {}; var id = ((sid || sid === 0) && n[sid] !== undefined && n[sid] !== "" ? n[sid] : null); for(var j = 0, jlen = fields.length; j < jlen; j++){ var f = fields.items[j]; var k = f.mapping !== undefined && f.mapping !== null ? f.mapping : j; var v = n[k] !== undefined ? n[k] : f.defaultValue; v = f.convert(v, n); values[f.name] = v; } var record = new recordType(values, id); record.json = n; records[records.length] = record; } return { records : records, totalRecords : records.length }; } });