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* Ext JS Library 3.0 RC2
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* Copyright(c) 2006-2009, Ext JS, LLC.
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* http://extjs.com/license
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* @class Ext.data.Field
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* <p>This class encapsulates the field definition information specified in the field definition objects
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* passed to {@link Ext.data.Record#create}.</p>
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* <p>Developers do not need to instantiate this class. Instances are created by {@link Ext.data.Record.create}
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* and cached in the {@link Ext.data.Record#fields fields} property of the created Record constructor's <b>prototype.</b></p>
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Ext.data.Field = function(config){
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if(typeof config == "string"){
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config = {name: config};
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Ext.apply(this, config);
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var st = Ext.data.SortTypes;
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// named sortTypes are supported, here we look them up
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if(typeof this.sortType == "string"){
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this.sortType = st[this.sortType];
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// set default sortType for strings and dates
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this.sortType = st.asUCString;
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this.sortType = st.asDate;
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this.sortType = st.none;
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var stripRe = /[\$,%]/g;
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// prebuilt conversion function for this field, instead of
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// switching every time we're reading a value
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var cv, dateFormat = this.dateFormat;
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cv = function(v){ return v; };
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cv = function(v){ return (v === undefined || v === null) ? '' : String(v); };
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return v !== undefined && v !== null && v !== '' ?
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parseInt(String(v).replace(stripRe, ""), 10) : '';
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return v !== undefined && v !== null && v !== '' ?
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parseFloat(String(v).replace(stripRe, ""), 10) : '';
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cv = function(v){ return v === true || v === "true" || v == 1; };
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if(dateFormat == "timestamp"){
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return new Date(v*1000);
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if(dateFormat == "time"){
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return new Date(parseInt(v, 10));
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return Date.parseDate(v, dateFormat);
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var parsed = Date.parse(v);
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return parsed ? new Date(parsed) : null;
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Ext.data.Field.prototype = {
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* The name by which the field is referenced within the Record. This is referenced by, for example,
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* the <tt>dataIndex</tt> property in column definition objects passed to {@link Ext.grid.ColumnModel}.
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* <p>Note: In the simplest case, if no properties other than <tt>name</tt> are required, a field
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* definition may consist of just a String for the field name.</p>
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* (Optional) The data type for conversion to displayable value if <tt>{@link Ext.data.Field#convert convert}</tt>
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* has not been specified. Possible values are
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* <div class="mdetail-params"><ul>
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* <li>auto (Default, implies no conversion)</li>
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* <li>date</li></ul></div>
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* @cfg {Function} convert
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* (Optional) A function which converts the value provided by the Reader into an object that will be stored
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* in the Record. It is passed the following parameters:<div class="mdetail-params"><ul>
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* <li><b>v</b> : Mixed<div class="sub-desc">The data value as read by the Reader, if undefined will use
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* the configured <tt>{@link Ext.data.Field#defaultValue defaultValue}</tt>.</div></li>
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* <li><b>rec</b> : Mixed<div class="sub-desc">The data object containing the row as read by the Reader.
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* Depending on the Reader type, this could be an Array ({@link Ext.data.ArrayReader ArrayReader}), an object
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* ({@link Ext.data.JsonReader JsonReader}), or an XML element ({@link Ext.data.XMLReader XMLReader}).</div></li>
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// example of convert function
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function fullName(v, record){
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return record.name.last + ', ' + record.name.first;
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function location(v, record){
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return !record.city ? '' : (record.city + ', ' + record.state);
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var Dude = Ext.data.Record.create([
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{name: 'fullname', convert: fullName},
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{name: 'firstname', mapping: 'name.first'},
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{name: 'lastname', mapping: 'name.last'},
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{name: 'city', defaultValue: 'homeless'},
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{name: 'location', convert: location}
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// create the data store
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var store = new Ext.data.Store({
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reader: new Ext.data.JsonReader(
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totalProperty: 'total'
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name: { first: 'Fat', last: 'Albert' }
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// notice no city, state provided in data object
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name: { first: 'Barney', last: 'Rubble' },
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city: 'Bedrock', state: 'Stoneridge'
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name: { first: 'Cliff', last: 'Claven' },
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city: 'Boston', state: 'MA'
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* @cfg {String} dateFormat
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* (Optional) A format string for the {@link Date#parseDate Date.parseDate} function, or "timestamp" if the
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* value provided by the Reader is a UNIX timestamp, or "time" if the value provided by the Reader is a
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* javascript millisecond timestamp.
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* @cfg {Mixed} defaultValue
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* (Optional) The default value used <b>when a Record is being created by a {@link Ext.data.Reader Reader}</b>
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* when the item referenced by the <tt>{@link Ext.data.Field#mapping mapping}</tt> does not exist in the data
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* object (i.e. undefined). (defaults to "")
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* @cfg {String/Number} mapping
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* <p>(Optional) A path expression for use by the {@link Ext.data.DataReader} implementation
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* that is creating the {@link Ext.data.Record Record} to extract the Field value from the data object.
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* If the path expression is the same as the field name, the mapping may be omitted.</p>
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* <p>The form of the mapping expression depends on the Reader being used.</p>
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* <div class="mdetail-params"><ul>
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* <li>{@link Ext.data.JsonReader}<div class="sub-desc">The mapping is a string containing the javascript
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* expression to reference the data from an element of the data item's {@link Ext.data.JsonReader#root root} Array. Defaults to the field name.</div></li>
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* <li>{@link Ext.data.XmlReader}<div class="sub-desc">The mapping is an {@link Ext.DomQuery} path to the data
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* item relative to the DOM element that represents the {@link Ext.data.XmlReader#record record}. Defaults to the field name.</div></li>
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* <li>{@link Ext.data.ArrayReader}<div class="sub-desc">The mapping is a number indicating the Array index
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* of the field's value. Defaults to the field specification's Array position.</div></li>
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* <p>If a more complex value extraction strategy is required, then configure the Field with a {@link #convert}
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* function. This is passed the whole row object, and may interrogate it in whatever way is necessary in order to
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* return the desired data.</p>
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* @cfg {Function} sortType
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* (Optional) A function which converts a Field's value to a comparable value in order to ensure
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* correct sort ordering. Predefined functions are provided in {@link Ext.data.SortTypes}. A custom
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* sort example:<pre><code>
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// current sort after sort we want
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// +-+------+ +-+------+
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// |1|First | |1|First |
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// |2|Last | |3|Second|
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// |3|Second| |2|Last |
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// +-+------+ +-+------+
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sortType: function(value) {
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switch (value.toLowerCase()) // native toLowerCase():
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case 'first': return 1;
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case 'second': return 2;
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* @cfg {String} sortDir
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* (Optional) Initial direction to sort (<tt>"ASC"</tt> or <tt>"DESC"</tt>). Defaults to
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* @cfg {Boolean} allowBlank
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* (Optional) Used for validating a {@link Ext.data.Record record}, defaults to <tt>true</tt>.
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* An empty value here will cause {@link Ext.data.Record}.{@link Ext.data.Record#isValid isValid}
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* to evaluate to <tt>false</tt>.
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