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/Record.js
/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
/**
* @class Ext.data.Record
* Instances of this class encapsulate both record <em>definition</em> information, and record
* <em>value</em> information for use in {@link Ext.data.Store} objects, or any code which needs
* to access Records cached in an {@link Ext.data.Store} object.<br>
* <p>
* Constructors for this class are generated by passing an Array of field definition objects to {@link #create}.
* Instances are usually only created by {@link Ext.data.Reader} implementations when processing unformatted data
* objects.<br>
* <p>
* Record objects generated by this constructor inherit all the methods of Ext.data.Record listed below.
* @constructor
* This constructor should not be used to create Record objects. Instead, use the constructor generated by
* {@link #create}. The parameters are the same.
* @param {Array} data An associative Array of data values keyed by the field name.
* @param {Object} id (Optional) The id of the record. This id should be unique, and is used by the
* {@link Ext.data.Store} object which owns the Record to index its collection of Records. If
* not specified an integer id is generated.
*/
Ext.data.Record = function(data, id){
this.id = (id || id === 0) ? id : ++Ext.data.Record.AUTO_ID;
this.data = data;
};
/**
* Generate a constructor for a specific record layout.
* @param {Array} o An Array of field definition objects which specify field names, and optionally,
* data types, and a mapping for an {@link Ext.data.Reader} to extract the field's value from a data object.
* Each field definition object may contain the following properties: <ul>
* <li><b>name</b> : String<p style="margin-left:1em">The name by which the field is referenced within the Record. This is referenced by,
* for example the <em>dataIndex</em> property in column definition objects passed to {@link Ext.grid.ColumnModel}</p></li>
* <li><b>mapping</b> : String<p style="margin-left:1em">(Optional) A path specification for use by the {@link Ext.data.Reader} implementation
* that is creating the Record to access the data value from the data object. If an {@link Ext.data.JsonReader}
* is being used, then this is a string containing the javascript expression to reference the data relative to
* the record item's root. If an {@link Ext.data.XmlReader} is being used, this is an {@link Ext.DomQuery} path
* to the data item relative to the record element. If the mapping expression is the same as the field name,
* this may be omitted.</p></li>
* <li><b>type</b> : String<p style="margin-left:1em">(Optional) The data type for conversion to displayable value. Possible values are
* <ul><li>auto (Default, implies no conversion)</li>
* <li>string</li>
* <li>int</li>
* <li>float</li>
* <li>boolean</li>
* <li>date</li></ul></p></li>
* <li><b>sortType</b> : Mixed<p style="margin-left:1em">(Optional) A member of {@link Ext.data.SortTypes}.</p></li>
* <li><b>sortDir</b> : String<p style="margin-left:1em">(Optional) Initial direction to sort. "ASC" or "DESC"</p></li>
* <li><b>convert</b> : Function<p style="margin-left:1em">(Optional) A function which converts the value provided
* by the Reader into an object that will be stored in the Record. It is passed the
* following parameters:<ul>
* <li><b>v</b> : Mixed<p style="margin-left:1em">The data value as read by the Reader.</p></li>
* <li><b>rec</b> : Mixed<p style="margin-left:1em">The data object containting the row as read by the Reader.
* Depending on Reader type, this could be an Array, an object, or an XML element.</p></li>
* </ul></p></li>
* <li><b>dateFormat</b> : String<p style="margin-left:1em">(Optional) A format String for the Date.parseDate function.</p></li>
* </ul>
* <br>usage:<br><pre><code>
var TopicRecord = Ext.data.Record.create([
{name: 'title', mapping: 'topic_title'},
{name: 'author', mapping: 'username'},
{name: 'totalPosts', mapping: 'topic_replies', type: 'int'},
{name: 'lastPost', mapping: 'post_time', type: 'date'},
{name: 'lastPoster', mapping: 'user2'},
{name: 'excerpt', mapping: 'post_text'}
]);
var myNewRecord = new TopicRecord({
title: 'Do my job please',
author: 'noobie',
totalPosts: 1,
lastPost: new Date(),
lastPoster: 'Animal',
excerpt: 'No way dude!'
});
myStore.add(myNewRecord);
</code></pre>
* <p>In the simplest case, if no properties other than <tt>name</tt> are required, a field definition
* may consist of just a field name string.</p>
* @method create
* @return {function} A constructor which is used to create new Records according
* to the definition.
* @static
*/
Ext.data.Record.create = function(o){
var f = Ext.extend(Ext.data.Record, {});
var p = f.prototype;
p.fields = new Ext.util.MixedCollection(false, function(field){
return field.name;
});
for(var i = 0, len = o.length; i < len; i++){
p.fields.add(new Ext.data.Field(o[i]));
}
f.getField = function(name){
return p.fields.get(name);
};
return f;
};
Ext.data.Record.AUTO_ID = 1000;
Ext.data.Record.EDIT = 'edit';
Ext.data.Record.REJECT = 'reject';
Ext.data.Record.COMMIT = 'commit';
Ext.data.Record.prototype = {
/**
* The data for this record an object hash.
* @property data
* @type {Object}
*/
/**
* The unique ID of the record as specified at construction time.
* @property id
* @type {Object}
*/
/**
* Readonly flag - true if this record has been modified.
* @type Boolean
*/
dirty : false,
editing : false,
error: null,
/**
* This object contains a key and value storing the original values of all modified fields or is null if no fields have been modified.
* @property modified
* @type {Object}
*/
modified: null,
// private
join : function(store){
this.store = store;
},
/**
* Set the named field to the specified value.
* @param {String} name The name of the field to set.
* @param {Object} value The value to set the field to.
*/
set : function(name, value){
if(String(this.data[name]) == String(value)){
return;
}
this.dirty = true;
if(!this.modified){
this.modified = {};
}
if(typeof this.modified[name] == 'undefined'){
this.modified[name] = this.data[name];
}
this.data[name] = value;
if(!this.editing && this.store){
this.store.afterEdit(this);
}
},
/**
* Get the value of the named field.
* @param {String} name The name of the field to get the value of.
* @return {Object} The value of the field.
*/
get : function(name){
return this.data[name];
},
/**
* Begin an edit. While in edit mode, no events are relayed to the containing store.
*/
beginEdit : function(){
this.editing = true;
this.modified = {};
},
/**
* Cancels all changes made in the current edit operation.
*/
cancelEdit : function(){
this.editing = false;
delete this.modified;
},
/**
* End an edit. If any data was modified, the containing store is notified.
*/
endEdit : function(){
this.editing = false;
if(this.dirty && this.store){
this.store.afterEdit(this);
}
},
/**
* Usually called by the {@link Ext.data.Store} which owns the Record.
* Rejects all changes made to the Record since either creation, or the last commit operation.
* Modified fields are reverted to their original values.
* <p>
* Developers should subscribe to the {@link Ext.data.Store#update} event to have their code notified
* of reject operations.
* @param {Boolean} silent (optional) True to skip notification of the owning store of the change (defaults to false)
*/
reject : function(silent){
var m = this.modified;
for(var n in m){
if(typeof m[n] != "function"){
this.data[n] = m[n];
}
}
this.dirty = false;
delete this.modified;
this.editing = false;
if(this.store && silent !== true){
this.store.afterReject(this);
}
},
/**
* Usually called by the {@link Ext.data.Store} which owns the Record.
* Commits all changes made to the Record since either creation, or the last commit operation.
* <p>
* Developers should subscribe to the {@link Ext.data.Store#update} event to have their code notified
* of commit operations.
* @param {Boolean} silent (optional) True to skip notification of the owning store of the change (defaults to false)
*/
commit : function(silent){
this.dirty = false;
delete this.modified;
this.editing = false;
if(this.store && silent !== true){
this.store.afterCommit(this);
}
},
/**
* Gets a hash of only the fields that have been modified since this record was created or commited.
* @return Object
*/
getChanges : function(){
var m = this.modified, cs = {};
for(var n in m){
if(m.hasOwnProperty(n)){
cs[n] = this.data[n];
}
}
return cs;
},
// private
hasError : function(){
return this.error != null;
},
// private
clearError : function(){
this.error = null;
},
/**
* Creates a copy of this record.
* @param {String} id (optional) A new record id if you don't want to use this record's id
* @return {Record}
*/
copy : function(newId) {
return new this.constructor(Ext.apply({}, this.data), newId || this.id);
},
/**
* Returns true if the field passed has been modified since the load or last commit.
* @param {String} fieldName
* @return {Boolean}
*/
isModified : function(fieldName){
return this.modified && this.modified.hasOwnProperty(fieldName);
}
};