2 * Ext JS Library 2.2.1
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3 * Copyright(c) 2006-2009, Ext JS, LLC.
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4 * licensing@extjs.com
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6 * http://extjs.com/license
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10 * @class Ext.data.Record
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11 * <p>Instances of this class encapsulate both Record <em>definition</em> information, and Record
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12 * <em>value</em> information for use in {@link Ext.data.Store} objects, or any code which needs
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13 * to access Records cached in an {@link Ext.data.Store} object.</p>
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14 * <p>Constructors for this class are generated by passing an Array of field definition objects to {@link #create}.
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15 * Instances are usually only created by {@link Ext.data.Reader} implementations when processing unformatted data
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17 * <p>Note that an instance of a Record class may only belong to one {@link Ext.data.Store Store} at a time.
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18 * In order to copy data from one Store to another, use the {@link #copy} method to create an exact
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19 * copy of the Record, and insert the new instance into the other Store.</p>
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20 * <p>When serializing a Record for submission to the server, be aware that it contains many private
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21 * properties, and also a reference to its owning Store which in turn holds references to its Records.
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22 * This means that a Record may not be encoded using {@link Ext.util.JSON.encode}. Instead, use the
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23 * {@link data} and {@link id} properties.</p>
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24 * Record objects generated by this constructor inherit all the methods of Ext.data.Record listed below.
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26 * This constructor should not be used to create Record objects. Instead, use the constructor generated by
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27 * {@link #create}. The parameters are the same.
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28 * @param {Array} data An object, the properties of which provide values for the new Record's fields.
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29 * @param {Object} id (Optional) The id of the Record. This id should be unique, and is used by the
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30 * {@link Ext.data.Store} object which owns the Record to index its collection of Records. If
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31 * not specified an integer id is generated.
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33 Ext.data.Record = function(data, id){
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34 this.id = (id || id === 0) ? id : ++Ext.data.Record.AUTO_ID;
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39 * Generate a constructor for a specific Record layout.
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40 * @param {Array} o An Array of field definition objects which specify field names, and optionally,
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41 * data types, and a mapping for an {@link Ext.data.Reader} to extract the field's value from a data object.
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42 * Each field definition object may contain the following properties: <ul>
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43 * <li><b>name</b> : String<div class="sub-desc">The name by which the field is referenced within the Record. This is referenced by,
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44 * for example, the <em>dataIndex</em> property in column definition objects passed to {@link Ext.grid.ColumnModel}</div></li>
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45 * <li><b>mapping</b> : String<div class="sub-desc">(Optional) A path specification for use by the {@link Ext.data.Reader} implementation
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46 * that is creating the Record to access the data value from the data object. If an {@link Ext.data.JsonReader}
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47 * is being used, then this is a string containing the javascript expression to reference the data relative to
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48 * the Record item's root. If an {@link Ext.data.XmlReader} is being used, this is an {@link Ext.DomQuery} path
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49 * to the data item relative to the Record element. If the mapping expression is the same as the field name,
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50 * this may be omitted.</div></li>
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51 * <li><b>type</b> : String<div class="sub-desc">(Optional) The data type for conversion to displayable value. Possible values are
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52 * <ul><li>auto (Default, implies no conversion)</li>
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57 * <li>date</li></ul></div></li>
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58 * <li><b>sortType</b> : Function<div class="sub-desc">(Optional) A function which converts a Field's value to a comparable value
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59 * in order to ensure correct sort ordering. Predefined functions are provided in {@link Ext.data.SortTypes}.</div></li>
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60 * <li><b>sortDir</b> : String<div class="sub-desc">(Optional) Initial direction to sort. "ASC" or "DESC"</div></li>
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61 * <li><b>convert</b> : Function<div class="sub-desc">(Optional) A function which converts the value provided
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62 * by the Reader into an object that will be stored in the Record. It is passed the
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63 * following parameters:<ul>
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64 * <li><b>v</b> : Mixed<div class="sub-desc">The data value as read by the Reader.</div></li>
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65 * <li><b>rec</b> : Mixed<div class="sub-desc">The data object containing the row as read by the Reader.
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66 * Depending on Reader type, this could be an Array, an object, or an XML element.</div></li>
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68 * <li><b>dateFormat</b> : String<div class="sub-desc">(Optional) A format string for the {@link Date#parseDate Date.parseDate} function,
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69 * or "timestamp" if the value provided by the Reader is a UNIX timestamp, or "time" if the value provided by the Reader is a
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70 * javascript millisecond timestamp.</div></li>
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71 * <li><b>defaultValue</b> : Mixed<div class="sub-desc">(Optional) The default value used <b>when a Record is being created by a
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72 * {@link Ext.data.Reader Reader}</b> when the item referenced by the <b><tt>mapping</tt></b> does not exist in the data object
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73 * (i.e. undefined). (defaults to "")</div></li>
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75 * The constructor generated by this method may be used to create new Record instances. The data object must contain properties
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76 * named after the field <b>names</b>.
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77 * <br>usage:<br><pre><code>
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78 var TopicRecord = Ext.data.Record.create([
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79 {name: 'title', mapping: 'topic_title'},
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80 {name: 'author', mapping: 'username'},
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81 {name: 'totalPosts', mapping: 'topic_replies', type: 'int'},
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82 {name: 'lastPost', mapping: 'post_time', type: 'date'},
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83 {name: 'lastPoster', mapping: 'user2'},
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84 {name: 'excerpt', mapping: 'post_text'}
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87 var myNewRecord = new TopicRecord({
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88 title: 'Do my job please',
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91 lastPost: new Date(),
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92 lastPoster: 'Animal',
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93 excerpt: 'No way dude!'
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95 myStore.add(myNewRecord);
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97 * <p>In the simplest case, if no properties other than <tt>name</tt> are required, a field definition
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98 * may consist of just a field name string.</p>
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100 * @return {function} A constructor which is used to create new Records according
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101 * to the definition.
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104 Ext.data.Record.create = function(o){
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105 var f = Ext.extend(Ext.data.Record, {});
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106 var p = f.prototype;
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107 p.fields = new Ext.util.MixedCollection(false, function(field){
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110 for(var i = 0, len = o.length; i < len; i++){
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111 p.fields.add(new Ext.data.Field(o[i]));
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113 f.getField = function(name){
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114 return p.fields.get(name);
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119 Ext.data.Record.AUTO_ID = 1000;
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120 Ext.data.Record.EDIT = 'edit';
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121 Ext.data.Record.REJECT = 'reject';
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122 Ext.data.Record.COMMIT = 'commit';
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124 Ext.data.Record.prototype = {
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126 * <p><b>This property is stored in the Record definition's <u>prototype</u></b></p>
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127 * A MixedCollection containing the defined {@link Ext.data.Field Field}s for this Record. Read-only.
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129 * @type Ext.util.MixedCollection
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132 * An object hash representing the data for this Record. Every field name in the Record definition
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133 * is represented by a property of that name in this object. Note that unless you specified a field
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134 * with name "id" in the Record definition, this will <b>not</b> contain an <tt>id</tt> property.
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139 * The unique ID of the Record as specified at construction time.
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144 * Readonly flag - true if this Record has been modified.
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151 * This object contains a key and value storing the original values of all modified fields or is null if no fields have been modified.
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152 * @property modified
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158 join : function(store){
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159 this.store = store;
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163 * Set the named field to the specified value.
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164 * @param {String} name The name of the field to set.
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165 * @param {Object} value The value to set the field to.
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167 set : function(name, value){
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168 if(String(this.data[name]) == String(value)){
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172 if(!this.modified){
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173 this.modified = {};
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175 if(typeof this.modified[name] == 'undefined'){
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176 this.modified[name] = this.data[name];
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178 this.data[name] = value;
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179 if(!this.editing && this.store){
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180 this.store.afterEdit(this);
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185 * Get the value of the named field.
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186 * @param {String} name The name of the field to get the value of.
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187 * @return {Object} The value of the field.
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189 get : function(name){
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190 return this.data[name];
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194 * Begin an edit. While in edit mode, no events are relayed to the containing store.
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196 beginEdit : function(){
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197 this.editing = true;
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198 this.modified = {};
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202 * Cancels all changes made in the current edit operation.
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204 cancelEdit : function(){
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205 this.editing = false;
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206 delete this.modified;
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210 * End an edit. If any data was modified, the containing store is notified.
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212 endEdit : function(){
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213 this.editing = false;
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214 if(this.dirty && this.store){
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215 this.store.afterEdit(this);
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220 * Usually called by the {@link Ext.data.Store} which owns the Record.
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221 * Rejects all changes made to the Record since either creation, or the last commit operation.
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222 * Modified fields are reverted to their original values.
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224 * Developers should subscribe to the {@link Ext.data.Store#update} event to have their code notified
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225 * of reject operations.
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226 * @param {Boolean} silent (optional) True to skip notification of the owning store of the change (defaults to false)
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228 reject : function(silent){
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229 var m = this.modified;
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231 if(typeof m[n] != "function"){
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232 this.data[n] = m[n];
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235 this.dirty = false;
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236 delete this.modified;
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237 this.editing = false;
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238 if(this.store && silent !== true){
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239 this.store.afterReject(this);
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244 * Usually called by the {@link Ext.data.Store} which owns the Record.
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245 * Commits all changes made to the Record since either creation, or the last commit operation.
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247 * Developers should subscribe to the {@link Ext.data.Store#update} event to have their code notified
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248 * of commit operations.
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249 * @param {Boolean} silent (optional) True to skip notification of the owning store of the change (defaults to false)
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251 commit : function(silent){
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252 this.dirty = false;
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253 delete this.modified;
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254 this.editing = false;
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255 if(this.store && silent !== true){
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256 this.store.afterCommit(this);
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261 * Gets a hash of only the fields that have been modified since this Record was created or commited.
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264 getChanges : function(){
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265 var m = this.modified, cs = {};
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267 if(m.hasOwnProperty(n)){
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268 cs[n] = this.data[n];
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275 hasError : function(){
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276 return this.error != null;
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280 clearError : function(){
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285 * Creates a copy of this Record.
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286 * @param {String} id (optional) A new Record id if you don't want to use this Record's id
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289 copy : function(newId) {
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290 return new this.constructor(Ext.apply({}, this.data), newId || this.id);
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294 * Returns true if the field passed has been modified since the load or last commit.
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295 * @param {String} fieldName
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296 * @return {Boolean}
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298 isModified : function(fieldName){
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299 return !!(this.modified && this.modified.hasOwnProperty(fieldName));
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