<!DOCTYPE html>
|
<html>
|
<head>
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
<title>The source code</title>
|
<link href="../resources/prettify/prettify.css" type="text/css" rel="stylesheet" />
|
<script type="text/javascript" src="../resources/prettify/prettify.js"></script>
|
<style type="text/css">
|
.highlight { display: block; background-color: #ddd; }
|
</style>
|
<script type="text/javascript">
|
function highlight() {
|
document.getElementById(location.hash.replace(/#/, "")).className = "highlight";
|
}
|
</script>
|
</head>
|
<body onload="prettyPrint(); highlight();">
|
<pre class="prettyprint lang-js"><span id='Ext-data-Field'>/**
|
</span> * @author Ed Spencer
|
*
|
* Fields are used to define what a Model is. They aren't instantiated directly - instead, when we create a class that
|
* extends {@link Ext.data.Model}, it will automatically create a Field instance for each field configured in a {@link
|
* Ext.data.Model Model}. For example, we might set up a model like this:
|
*
|
* Ext.define('User', {
|
* extend: 'Ext.data.Model',
|
* fields: [
|
* 'name', 'email',
|
* {name: 'age', type: 'int'},
|
* {name: 'gender', type: 'string', defaultValue: 'Unknown'}
|
* ]
|
* });
|
*
|
* Four fields will have been created for the User Model - name, email, age and gender. Note that we specified a couple
|
* of different formats here; if we only pass in the string name of the field (as with name and email), the field is set
|
* up with the 'auto' type. It's as if we'd done this instead:
|
*
|
* Ext.define('User', {
|
* extend: 'Ext.data.Model',
|
* fields: [
|
* {name: 'name', type: 'auto'},
|
* {name: 'email', type: 'auto'},
|
* {name: 'age', type: 'int'},
|
* {name: 'gender', type: 'string', defaultValue: 'Unknown'}
|
* ]
|
* });
|
*
|
* # Types and conversion
|
*
|
* The {@link #type} is important - it's used to automatically convert data passed to the field into the correct format.
|
* In our example above, the name and email fields used the 'auto' type and will just accept anything that is passed
|
* into them. The 'age' field had an 'int' type however, so if we passed 25.4 this would be rounded to 25.
|
*
|
* Sometimes a simple type isn't enough, or we want to perform some processing when we load a Field's data. We can do
|
* this using a {@link #convert} function. Here, we're going to create a new field based on another:
|
*
|
* Ext.define('User', {
|
* extend: 'Ext.data.Model',
|
* fields: [
|
* {
|
* name: 'firstName',
|
* convert: function(value, record) {
|
* var fullName = record.get('name'),
|
* splits = fullName.split(" "),
|
* firstName = splits[0];
|
*
|
* return firstName;
|
* }
|
* },
|
* 'name', 'email',
|
* {name: 'age', type: 'int'},
|
* {name: 'gender', type: 'string', defaultValue: 'Unknown'}
|
* ]
|
* });
|
*
|
* Now when we create a new User, the firstName is populated automatically based on the name:
|
*
|
* var ed = Ext.create('User', {name: 'Ed Spencer'});
|
*
|
* console.log(ed.get('firstName')); //logs 'Ed', based on our convert function
|
*
|
* Fields which are configured with a custom ```convert``` function are read *after* all other fields
|
* when constructing and reading records, so that if convert functions rely on other, non-converted fields
|
* (as in this example), they can be sure of those fields being present.
|
*
|
* In fact, if we log out all of the data inside ed, we'll see this:
|
*
|
* console.log(ed.data);
|
*
|
* //outputs this:
|
* {
|
* age: 0,
|
* email: "",
|
* firstName: "Ed",
|
* gender: "Unknown",
|
* name: "Ed Spencer"
|
* }
|
*
|
* The age field has been given a default of zero because we made it an int type. As an auto field, email has defaulted
|
* to an empty string. When we registered the User model we set gender's {@link #defaultValue} to 'Unknown' so we see
|
* that now. Let's correct that and satisfy ourselves that the types work as we expect:
|
*
|
* ed.set('gender', 'Male');
|
* ed.get('gender'); //returns 'Male'
|
*
|
* ed.set('age', 25.4);
|
* ed.get('age'); //returns 25 - we wanted an int, not a float, so no decimal places allowed
|
*/
|
Ext.define('Ext.data.Field', {
|
requires: ['Ext.data.Types', 'Ext.data.SortTypes'],
|
alias: 'data.field',
|
|
<span id='Ext-data-Field-property-isField'> isField: true,
|
</span>
|
<span id='Ext-data-Field-method-constructor'> constructor : function(config) {
|
</span> var me = this,
|
types = Ext.data.Types,
|
st;
|
|
if (Ext.isString(config)) {
|
config = {name: config};
|
}
|
Ext.apply(me, config);
|
|
st = me.sortType;
|
|
if (me.type) {
|
if (Ext.isString(me.type)) {
|
me.type = types[me.type.toUpperCase()] || types.AUTO;
|
}
|
} else {
|
me.type = types.AUTO;
|
}
|
|
// named sortTypes are supported, here we look them up
|
if (Ext.isString(st)) {
|
me.sortType = Ext.data.SortTypes[st];
|
} else if(Ext.isEmpty(st)) {
|
me.sortType = me.type.sortType;
|
}
|
|
// Reference this type's default converter if we did not recieve one in configuration.
|
if (!config.hasOwnProperty('convert')) {
|
me.convert = me.type.convert; // this may be undefined (e.g., AUTO)
|
} else if (!me.convert && me.type.convert && !config.hasOwnProperty('defaultValue')) {
|
// If the converter has been nulled out, and we have not been configured
|
// with a field-specific defaultValue, then coerce the inherited defaultValue into our data type.
|
me.defaultValue = me.type.convert(me.defaultValue);
|
}
|
|
if (config.convert) {
|
me.hasCustomConvert = true;
|
}
|
},
|
|
<span id='Ext-data-Field-cfg-name'> /**
|
</span> * @cfg {String} name
|
*
|
* The name by which the field is referenced within the Model. This is referenced by, for example, the `dataIndex`
|
* property in column definition objects passed to {@link Ext.grid.property.HeaderContainer}.
|
*
|
* Note: In the simplest case, if no properties other than `name` are required, a field definition may consist of
|
* just a String for the field name.
|
*/
|
|
<span id='Ext-data-Field-cfg-type'> /**
|
</span> * @cfg {String/Object} type
|
*
|
* The data type for automatic conversion from received data to the *stored* value if
|
* `{@link Ext.data.Field#convert convert}` has not been specified. This may be specified as a string value.
|
* Possible values are
|
*
|
* - auto (Default, implies no conversion)
|
* - string
|
* - int
|
* - float
|
* - boolean
|
* - date
|
*
|
* This may also be specified by referencing a member of the {@link Ext.data.Types} class.
|
*
|
* Developers may create their own application-specific data types by defining new members of the {@link
|
* Ext.data.Types} class.
|
*/
|
|
<span id='Ext-data-Field-cfg-convert'> /**
|
</span> * @cfg {Function} [convert]
|
*
|
* A function which converts the value provided by the Reader into an object that will be stored in the Model.
|
*
|
* If configured as `null`, then no conversion will be applied to the raw data property when this Field
|
* is read. This will increase performance. but you must ensure that the data is of the correct type and does
|
* not *need* converting.
|
*
|
* It is passed the following parameters:
|
*
|
* - **v** : Mixed
|
*
|
* The data value as read by the Reader, if undefined will use the configured `{@link Ext.data.Field#defaultValue
|
* defaultValue}`.
|
*
|
* - **rec** : Ext.data.Model
|
*
|
* The data object containing the Model as read so far by the Reader. Note that the Model may not be fully populated
|
* at this point as the fields are read in the order that they are defined in your
|
* {@link Ext.data.Model#cfg-fields fields} array.
|
*
|
* Example of convert functions:
|
*
|
* function fullName(v, record){
|
* return record.data.last + ', ' + record.data.first;
|
* }
|
*
|
* function location(v, record){
|
* return !record.data.city ? '' : (record.data.city + ', ' + record.data.state);
|
* }
|
*
|
* Ext.define('Dude', {
|
* extend: 'Ext.data.Model',
|
* fields: [
|
* {name: 'fullname', convert: fullName},
|
* {name: 'firstname', mapping: 'name.first'},
|
* {name: 'lastname', mapping: 'name.last'},
|
* {name: 'city', defaultValue: 'homeless'},
|
* 'state',
|
* {name: 'location', convert: location}
|
* ]
|
* });
|
*
|
* // create the data store
|
* var store = Ext.create('Ext.data.Store', {
|
* reader: {
|
* type: 'json',
|
* model: 'Dude',
|
* idProperty: 'key',
|
* root: 'daRoot',
|
* totalProperty: 'total'
|
* }
|
* });
|
*
|
* var myData = [
|
* { key: 1,
|
* name: { first: 'Fat', last: 'Albert' }
|
* // notice no city, state provided in data object
|
* },
|
* { key: 2,
|
* name: { first: 'Barney', last: 'Rubble' },
|
* city: 'Bedrock', state: 'Stoneridge'
|
* },
|
* { key: 3,
|
* name: { first: 'Cliff', last: 'Claven' },
|
* city: 'Boston', state: 'MA'
|
* }
|
* ];
|
*/
|
|
<span id='Ext-data-Field-cfg-serialize'> /**
|
</span> * @cfg {Function} [serialize]
|
* A function which converts the Model's value for this Field into a form which can be used by whatever {@link Ext.data.writer.Writer Writer}
|
* is being used to sync data with the server.
|
*
|
* The function should return a string which represents the Field's value.
|
*
|
* It is passed the following parameters:
|
*
|
* - **v** : Mixed
|
*
|
* The Field's value - the value to be serialized.
|
*
|
* - **rec** : Ext.data.Model
|
*
|
* The record being serialized.
|
*
|
*/
|
|
<span id='Ext-data-Field-cfg-dateFormat'> /**
|
</span> * @cfg {String} dateFormat
|
*
|
* Serves as a default for the {@link #dateReadFormat} and {@link #dateWriteFormat} config options. This
|
* will be used in place of those other configurations if not specified.
|
*
|
* A format string for the {@link Ext.Date#parse Ext.Date.parse} function, or "timestamp" if the value provided by
|
* the Reader is a UNIX timestamp, or "time" if the value provided by the Reader is a javascript millisecond
|
* timestamp. See {@link Ext.Date}.
|
*
|
* It is quite important to note that while this config is optional, it will default to using the base
|
* JavaScript Date object's `parse` function if not specified, rather than {@link Ext.Date#parse Ext.Date.parse}.
|
* This can cause unexpected issues, especially when converting between timezones, or when converting dates that
|
* do not have a timezone specified. The behavior of the native `Date.parse` is implementation-specific, and
|
* depending on the value of the date string, it might return the UTC date or the local date. __For this reason
|
* it is strongly recommended that you always specify an explicit date format when parsing dates.__
|
*/
|
dateFormat: null,
|
|
<span id='Ext-data-Field-cfg-dateReadFormat'> /**
|
</span> * @cfg {String} dateReadFormat
|
* Used when converting received data into a Date when the {@link #type} is specified as `"date"`.
|
* This configuration takes precedence over {@link #dateFormat}.
|
* See {@link #dateFormat} for more information.
|
*/
|
dateReadFormat: null,
|
|
<span id='Ext-data-Field-cfg-dateWriteFormat'> /**
|
</span> * @cfg {String} dateWriteFormat
|
* Used to provide a custom format when serializing dates with a {@link Ext.data.writer.Writer}.
|
* If this is not specified, the {@link #dateFormat} will be used. See the {@link Ext.data.writer.Writer}
|
* docs for more information on writing dates.
|
*
|
* **Note that to use a {@link Ext.data.JsonWriter JsonWriter} to send Microsoft format "JSON" dates, which are in fact
|
* invalid JSON, it is not possible to use the standard date serialization pathway or
|
* {@link Ext#USE_NATIVE_JSON native browser JSON production}.**
|
*
|
* To use a {@link Ext.data.JsonWriter JsonWriter} to write dates in a JSON packet in the form `"\/Date(1357372800000)\/"`
|
* configure the field like this:
|
*
|
* {
|
* type: 'date',
|
* dateFormat: 'MS', // To parse incoming dates from server correctly
|
* serialize: Ext.identityFn // An ExtJS-supplied function which returns the arg unchanged
|
* }
|
*
|
* Then override ExtJS's JSON date serialize function:
|
*
|
* Ext.JSON.encodeDate = function (d) {
|
* return '"' + Ext.Date.format(d, 'MS') + '"';
|
* };
|
*/
|
dateWriteFormat: null,
|
|
<span id='Ext-data-Field-cfg-useNull'> /**
|
</span> * @cfg {Boolean} useNull
|
*
|
* Use when converting received data into a INT, FLOAT, BOOL or STRING type. If the value cannot be
|
* parsed, `null` will be used if useNull is true, otherwise a default value for that type will be used:
|
*
|
* - for INT and FLOAT - `0`.
|
* - for STRING - `""`.
|
* - for BOOL - `false`.
|
*
|
* Note that when parsing of DATE type fails, the value will be `null` regardless of this setting.
|
*/
|
useNull: false,
|
|
<span id='Ext-data-Field-cfg-defaultValue'> /**
|
</span> * @cfg {Object} [defaultValue=""]
|
*
|
* The default value used when the creating an instance from a raw data object, and the property referenced by the
|
* `{@link Ext.data.Field#mapping mapping}` does not exist in that data object.
|
*
|
* May be specified as `undefined` to prevent defaulting in a value.
|
*/
|
defaultValue: "",
|
|
<span id='Ext-data-Field-cfg-mapping'> /**
|
</span> * @cfg {String/Number} mapping
|
*
|
* (Optional) A path expression for use by the {@link Ext.data.reader.Reader} implementation that is creating the
|
* {@link Ext.data.Model Model} to extract the Field value from the data object. If the path expression is the same
|
* as the field name, the mapping may be omitted.
|
*
|
* The form of the mapping expression depends on the Reader being used.
|
*
|
* - {@link Ext.data.reader.Json}
|
*
|
* The mapping is a string containing the javascript expression to reference the data from an element of the data
|
* item's {@link Ext.data.reader.Json#cfg-root root} Array. Defaults to the field name.
|
*
|
* - {@link Ext.data.reader.Xml}
|
*
|
* The mapping is an {@link Ext.DomQuery} path to the data item relative to the DOM element that represents the
|
* {@link Ext.data.reader.Xml#record record}. Defaults to the field name.
|
*
|
* - {@link Ext.data.reader.Array}
|
*
|
* The mapping is a number indicating the Array index of the field's value. Defaults to the field specification's
|
* Array position.
|
*
|
* If a more complex value extraction strategy is required, then configure the Field with a {@link #convert}
|
* function. This is passed the whole row object, and may interrogate it in whatever way is necessary in order to
|
* return the desired data.
|
*/
|
mapping: null,
|
|
<span id='Ext-data-Field-cfg-sortType'> /**
|
</span> * @cfg {Function/String} sortType
|
*
|
* A function which converts a Field's value to a comparable value in order to ensure correct sort ordering.
|
* Predefined functions are provided in {@link Ext.data.SortTypes}. A custom sort example:
|
*
|
* // current sort after sort we want
|
* // +-+------+ +-+------+
|
* // |1|First | |1|First |
|
* // |2|Last | |3|Second|
|
* // |3|Second| |2|Last |
|
* // +-+------+ +-+------+
|
*
|
* sortType: function(value) {
|
* switch (value.toLowerCase()) // native toLowerCase():
|
* {
|
* case 'first': return 1;
|
* case 'second': return 2;
|
* default: return 3;
|
* }
|
* }
|
*
|
* May also be set to a String value, corresponding to one of the named sort types in {@link Ext.data.SortTypes}.
|
*/
|
sortType : null,
|
|
<span id='Ext-data-Field-cfg-sortDir'> /**
|
</span> * @cfg {String} sortDir
|
*
|
* Initial direction to sort (`"ASC"` or `"DESC"`). Defaults to `"ASC"`.
|
*/
|
sortDir : "ASC",
|
|
<span id='Ext-data-Field-cfg-allowBlank'> /**
|
</span> * @cfg {Boolean} allowBlank
|
* @private
|
*
|
* Used for validating a {@link Ext.data.Model model}. Defaults to true. An empty value here will cause
|
* {@link Ext.data.Model}.{@link Ext.data.Model#isValid isValid} to evaluate to false.
|
*/
|
allowBlank : true,
|
|
<span id='Ext-data-Field-cfg-persist'> /**
|
</span> * @cfg {Boolean} persist
|
*
|
* False to exclude this field from the {@link Ext.data.Model#modified} fields in a model. This will also exclude
|
* the field from being written using a {@link Ext.data.writer.Writer}. This option is useful when model fields are
|
* used to keep state on the client but do not need to be persisted to the server. Defaults to true.
|
*/
|
persist: true
|
});
|
</pre>
|
</body>
|
</html>
|