1 <div class="body-wrap" xmlns:ext="http://www.extjs.com"><div class="top-tools"><a class="inner-link" href="#Ext.data.Field-props"><img src="resources/images/default/s.gif" class="item-icon icon-prop">Properties</a> <a class="inner-link" href="#Ext.data.Field-methods"><img src="resources/images/default/s.gif" class="item-icon icon-method">Methods</a> <a class="inner-link" href="#Ext.data.Field-events"><img src="resources/images/default/s.gif" class="item-icon icon-event">Events</a> <a class="inner-link" href="#Ext.data.Field-configs"><img src="resources/images/default/s.gif" class="item-icon icon-config">Config Options</a> <a class="bookmark" href="../docs/?class=Ext.data.Field"><img src="resources/images/default/s.gif" class="item-icon icon-fav">Direct Link</a> </div><h1>Class <a href="source/DataField.html#cls-Ext.data.Field">Ext.data.Field</a></h1><table cellspacing="0"><tr><td class="label">Package:</td><td class="hd-info">Ext.data</td></tr><tr><td class="label">Defined In:</td><td class="hd-info">DataField.js</td></tr><tr><td class="label">Class:</td><td class="hd-info"><a href="source/DataField.html#cls-Ext.data.Field">Field</a></td></tr><tr><td class="label">Extends:</td><td class="hd-info">Object</td></tr><tr><td class="hd-info"></td></tr></table><div class="description"><p>This class encapsulates the field definition information specified in the field definition objects
2 passed to <a href="output/Ext.data.Record.html#Ext.data.Record-create" ext:member="create" ext:cls="Ext.data.Record">Ext.data.Record.create</a>.</p>
3 <p>Developers do not need to instantiate this class. Instances are created by <a href="output/Ext.data.Record.create.html" ext:cls="Ext.data.Record.create">Ext.data.Record.create</a>
4 and cached in the <a href="output/Ext.data.Record.html#Ext.data.Record-fields" ext:member="fields" ext:cls="Ext.data.Record">fields</a> property of the created Record constructor's <b>prototype.</b></p></div><div class="hr"></div><a id="Ext.data.Field-configs"></a><h2>Config Options</h2><table cellspacing="0" class="member-table"><tbody><tr><th colspan="2" class="sig-header">Config Options</th><th class="msource-header">Defined By</th></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-allowBlank"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-allowBlank">allowBlank</a></b> : Boolean<div class="mdesc"><div class="short">Used for validating a record, defaults to true.
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5 An empty value here will cause Ext.data.Record.isValid
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6 to evaluate to...</div><div class="long">Used for validating a <a href="output/Ext.data.Record.html" ext:cls="Ext.data.Record">record</a>, defaults to <tt>true</tt>.
7 An empty value here will cause <a href="output/Ext.data.Record.html" ext:cls="Ext.data.Record">Ext.data.Record</a>.<a href="output/Ext.data.Record.html#Ext.data.Record-isValid" ext:member="isValid" ext:cls="Ext.data.Record">isValid</a>
8 to evaluate to <tt>false</tt>.</div></div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-convert"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-convert">convert</a></b> : Function<div class="mdesc"><div class="short">A function which converts the value provided by the Reader into an object that will be stored
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9 in the Record. It is pa...</div><div class="long">A function which converts the value provided by the Reader into an object that will be stored
10 in the Record. It is passed the following parameters:<div class="mdetail-params"><ul>
11 <li><b>v</b> : Mixed<div class="sub-desc">The data value as read by the Reader, if undefined will use
12 the configured <tt><a href="output/Ext.data.Field.html#Ext.data.Field-defaultValue" ext:member="defaultValue" ext:cls="Ext.data.Field">defaultValue</a></tt>.</div></li>
13 <li><b>rec</b> : Mixed<div class="sub-desc">The data object containing the row as read by the Reader.
14 Depending on the Reader type, this could be an Array (<a href="output/Ext.data.ArrayReader.html" ext:cls="Ext.data.ArrayReader">ArrayReader</a>), an object
15 (<a href="output/Ext.data.JsonReader.html" ext:cls="Ext.data.JsonReader">JsonReader</a>), or an XML element (<a href="output/Ext.data.XMLReader.html" ext:cls="Ext.data.XMLReader">XMLReader</a>).</div></li>
17 <pre><code><i>// example of convert <b>function</b></i>
18 <b>function</b> fullName(v, record){
19 <b>return</b> record.name.last + <em>', '</em> + record.name.first;
22 <b>function</b> location(v, record){
23 <b>return</b> !record.city ? <em>''</em> : (record.city + <em>', '</em> + record.state);
26 <b>var</b> Dude = Ext.data.Record.create([
27 {name: <em>'fullname'</em>, convert: fullName},
28 {name: <em>'firstname'</em>, mapping: <em>'name.first'</em>},
29 {name: <em>'lastname'</em>, mapping: <em>'name.last'</em>},
30 {name: <em>'city'</em>, defaultValue: <em>'homeless'</em>},
32 {name: <em>'location'</em>, convert: location}
35 <i>// create the data store</i>
36 <b>var</b> store = <b>new</b> Ext.data.Store({
37 reader: <b>new</b> Ext.data.JsonReader(
39 idProperty: <em>'key'</em>,
40 root: <em>'daRoot'</em>,
41 totalProperty: <em>'total'</em>
43 Dude <i>// recordType</i>
49 name: { first: <em>'Fat'</em>, last: <em>'Albert'</em> }
50 <i>// notice no city, state provided <b>in</b> data object</i>
53 name: { first: <em>'Barney'</em>, last: <em>'Rubble'</em> },
54 city: <em>'Bedrock'</em>, state: <em>'Stoneridge'</em>
57 name: { first: <em>'Cliff'</em>, last: <em>'Claven'</em> },
58 city: <em>'Boston'</em>, state: <em>'MA'</em>
60 ];</code></pre></div></div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-dateFormat"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-dateFormat">dateFormat</a></b> : String<div class="mdesc"><div class="short">A format string for the Date.parseDate function, or "timestamp" if the
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61 value provided by the Reader is a UNIX timesta...</div><div class="long">A format string for the <a href="output/Date.html#Date-parseDate" ext:member="parseDate" ext:cls="Date">Date.parseDate</a> function, or "timestamp" if the
62 value provided by the Reader is a UNIX timestamp, or "time" if the value provided by the Reader is a
63 javascript millisecond timestamp.</div></div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-defaultValue"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-defaultValue">defaultValue</a></b> : Mixed<div class="mdesc"><div class="short">The default value used when a Record is being created by a Reader
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64 when the item referenced by the mapping does not ex...</div><div class="long">The default value used <b>when a Record is being created by a <a href="output/Ext.data.Reader.html" ext:cls="Ext.data.Reader">Reader</a></b>
65 when the item referenced by the <tt><a href="output/Ext.data.Field.html#Ext.data.Field-mapping" ext:member="mapping" ext:cls="Ext.data.Field">mapping</a></tt> does not exist in the data
66 object (i.e. undefined). (defaults to "")</div></div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-mapping"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-mapping">mapping</a></b> : String/Number<div class="mdesc"><div class="short">(Optional) A path expression for use by the Ext.data.DataReader implementation
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67 that is creating the Record to extract...</div><div class="long"><p>(Optional) A path expression for use by the <a href="output/Ext.data.DataReader.html" ext:cls="Ext.data.DataReader">Ext.data.DataReader</a> implementation
68 that is creating the <a href="output/Ext.data.Record.html" ext:cls="Ext.data.Record">Record</a> to extract the Field value from the data object.
69 If the path expression is the same as the field name, the mapping may be omitted.</p>
70 <p>The form of the mapping expression depends on the Reader being used.</p>
71 <div class="mdetail-params"><ul>
72 <li><a href="output/Ext.data.JsonReader.html" ext:cls="Ext.data.JsonReader">Ext.data.JsonReader</a><div class="sub-desc">The mapping is a string containing the javascript
73 expression to reference the data from an element of the data item's <a href="output/Ext.data.JsonReader.html#Ext.data.JsonReader-root" ext:member="root" ext:cls="Ext.data.JsonReader">root</a> Array. Defaults to the field name.</div></li>
74 <li><a href="output/Ext.data.XmlReader.html" ext:cls="Ext.data.XmlReader">Ext.data.XmlReader</a><div class="sub-desc">The mapping is an <a href="output/Ext.DomQuery.html" ext:cls="Ext.DomQuery">Ext.DomQuery</a> path to the data
75 item relative to the DOM element that represents the <a href="output/Ext.data.XmlReader.html#Ext.data.XmlReader-record" ext:member="record" ext:cls="Ext.data.XmlReader">record</a>. Defaults to the field name.</div></li>
76 <li><a href="output/Ext.data.ArrayReader.html" ext:cls="Ext.data.ArrayReader">Ext.data.ArrayReader</a><div class="sub-desc">The mapping is a number indicating the Array index
77 of the field's value. Defaults to the field specification's Array position.</div></li>
79 <p>If a more complex value extraction strategy is required, then configure the Field with a <a href="output/Ext.data.Field.html#Ext.data.Field-convert" ext:member="convert" ext:cls="Ext.data.Field">convert</a>
80 function. This is passed the whole row object, and may interrogate it in whatever way is necessary in order to
81 return the desired data.</p></div></div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-name"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-name">name</a></b> : String<div class="mdesc"><div class="short">The name by which the field is referenced within the Record. This is referenced by, for example,
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82 the dataIndex proper...</div><div class="long">The name by which the field is referenced within the Record. This is referenced by, for example,
83 the <tt>dataIndex</tt> property in column definition objects passed to <a href="output/Ext.grid.ColumnModel.html" ext:cls="Ext.grid.ColumnModel">Ext.grid.ColumnModel</a>.
84 <p>Note: In the simplest case, if no properties other than <tt>name</tt> are required, a field
85 definition may consist of just a String for the field name.</p></div></div></td><td class="msource">Field</td></tr><tr class="config-row "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-sortDir"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-sortDir">sortDir</a></b> : String<div class="mdesc">Initial direction to sort (<tt>"ASC"</tt> or <tt>"DESC"</tt>). Defaults to
86 <tt>"ASC"</tt>.</div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-sortType"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-sortType">sortType</a></b> : Function<div class="mdesc"><div class="short">A function which converts a Field's value to a comparable value in order to ensure
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87 correct sort ordering. Predefined ...</div><div class="long">A function which converts a Field's value to a comparable value in order to ensure
88 correct sort ordering. Predefined functions are provided in <a href="output/Ext.data.SortTypes.html" ext:cls="Ext.data.SortTypes">Ext.data.SortTypes</a>. A custom
89 sort example:<pre><code><i>// current sort after sort we want</i>
90 <i>// +-+------+ +-+------+</i>
91 <i>// |1|First | |1|First |</i>
92 <i>// |2|Last | |3|Second|</i>
93 <i>// |3|Second| |2|Last |</i>
94 <i>// +-+------+ +-+------+</i>
96 sortType: <b>function</b>(value) {
97 <b>switch</b> (value.toLowerCase()) <i>// native toLowerCase():</i>
99 <b>case</b> <em>'first'</em>: <b>return</b> 1;
100 <b>case</b> <em>'second'</em>: <b>return</b> 2;
101 <b>default</b>: <b>return</b> 3;
103 }</code></pre></div></div></td><td class="msource">Field</td></tr><tr class="config-row expandable "><td class="micon"><a href="#expand" class="exi"> </a></td><td class="sig"><a id="Ext.data.Field-type"></a><b><a href="source/DataField.html#cfg-Ext.data.Field-type">type</a></b> : String<div class="mdesc"><div class="short">The data type for conversion to displayable value if convert
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104 has not been specified. Possible values are
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105 <div class="...</div><div class="long">The data type for conversion to displayable value if <tt><a href="output/Ext.data.Field.html#Ext.data.Field-convert" ext:member="convert" ext:cls="Ext.data.Field">convert</a></tt>
106 has not been specified. Possible values are
107 <div class="mdetail-params"><ul>
108 <li>auto (Default, implies no conversion)</li>
113 <li>date</li></ul></div></div></div></td><td class="msource">Field</td></tr></tbody></table><a id="Ext.data.Field-props"></a><h2>Public Properties</h2><div class="no-members">This class has no public properties.</div><a id="Ext.data.Field-methods"></a><h2>Public Methods</h2><div class="no-members">This class has no public methods.</div><a id="Ext.data.Field-events"></a><h2>Public Events</h2><div class="no-members">This class has no public events.</div></div>