X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/d41dc04ad17d1d9125fb2cf72db2b4782dbe3a8c..92c2b89db26be16707f4a805d3303ab2531006e1:/docs/output/Ext.data.JsonReader.html?ds=inline diff --git a/docs/output/Ext.data.JsonReader.html b/docs/output/Ext.data.JsonReader.html index 5c49b9a2..2303cb68 100644 --- a/docs/output/Ext.data.JsonReader.html +++ b/docs/output/Ext.data.JsonReader.html @@ -1,238 +1,140 @@ -
-
- Properties - Methods - Events - Config Options - Direct Link -
-
-
DataReader
-  JsonReader
-

Class Ext.data.JsonReader

- - - - - - -
Package:Ext.data
Defined In:JsonReader.js
Class:JsonReader
Subclasses:ArrayReader
Extends:DataReader
-
- * -Data reader class to create an Array of Ext.data.Record objects from a JSON response -based on mappings in a provided Ext.data.Record constructor.
-

-Example code: -

var Employee = Ext.data.Record.create([
-    {name: 'firstname'},                  // Map the Record's "firstname" field to the row object's key of the same name
-    {name: 'job', mapping: 'occupation'}  // Map the "job" field to the row object's "occupation" key
-]);
-var myReader = new Ext.data.JsonReader({
-    totalProperty: "results",             // The property which contains the total dataset size (optional)
-    root: "rows",                         // The property which contains an Array of row objects
-    id: "id"                              // The property within each row object that provides an ID for the record (optional)
-}, Employee);
-

-This would consume a JSON object of the form: -

{
-    results: 2,
-    rows: [
-        { id: 1, firstname: 'Bill', occupation: 'Gardener' },         // a row object
-        { id: 2, firstname: 'Ben' , occupation: 'Horticulturalist' }  // another row object
+
DataReader
  JsonReader
Class Ext.data.JsonReader
Package:Ext.data
Defined In:JsonReader.js
Class:JsonReader
Subclasses:ArrayReader
Extends:DataReader
Data reader class to create an Array of Ext.data.Record objects
+from a JSON packet based on mappings in a provided Ext.data.Record
+constructor.

+
Example code:

+
var myReader = new Ext.data.JsonReader({
+    // metadata configuration options:
+    idProperty: 'id'
+    root: 'rows',
+    totalProperty: 'results',
+    Ext.data.DataReader.messageProperty: "msg"  // The element within the response that provides a user-feedback message (optional)
+
+    // the fields config option will internally create an Ext.data.Record
+    // constructor that provides mapping for reading the record data objects
+    fields: [
+        // map Record's 'firstname' field to data object's key of same name
+        {name: 'name'},
+        // map Record's 'job' field to data object's 'occupation' key
+        {name: 'job', mapping: 'occupation'}
+    ]
+});

+
This would consume a JSON data object of the form:
{
+    results: 2000, // Reader's configured totalProperty
+    rows: [        // Reader's configured root
+        // record data objects:
+        { id: 1, firstname: 'Bill', occupation: 'Gardener' },
+        { id: 2, firstname: 'Ben' , occupation: 'Horticulturalist' },
+        ...
     ]
 }

-
It is possible to change a JsonReader's metadata at any time by including a
-metaData property in the data object. If this is detected in the
-object, a Store object using this Reader will reconfigure
-itself to use the newly provided field definition and fire its
-metachange event. In
-undergoing this change, the Store sets its sortInfo property
-from the sortInfo property in the new metadata. Note that reconfiguring a Store
-potentially invalidates objects which may refer to Fields or Records which no longer exist.

-
The metaData property may contain any of the configuration
-options for this class. Additionally, it may contain a fields
-property which the JsonReader will use as an argument to Ext.data.Record.create
-to configure the layout of the Records which it will produce.

-Using the metaData property, and the Store's metachange event,
-it is possible to have a Store-driven control initialize itself. The metachange
-event handler may interrogate the metaData property (which
-may contain any user-defined properties needed) and the metaData.fields
+
Automatic configuration using metaData

+
It is possible to change a JsonReader's metadata at any time by including
+a metaData property in the JSON data object. If the JSON data
+object has a metaData property, a Store
+object using this Reader will reconfigure itself to use the newly provided
+field definition and fire its metachange
+event. The metachange event handler may interrogate the metaData
 property to perform any configuration required.

-
To use this facility to send the same data as the above example without
-having to code the creation of the Record constructor, you would create the
-JsonReader like this:
var myReader = new Ext.data.JsonReader();

+
Note that reconfiguring a Store potentially invalidates objects which may
+refer to Fields or Records which no longer exist.

+
To use this facility you would create the JsonReader like this:
var myReader = new Ext.data.JsonReader();

 
The first data packet from the server would configure the reader by
-containing a metaData property as well as the data:
{
+containing a metaData property and the data. For
+example, the JSON data object might take the form:
{
     metaData: {
-        totalProperty: 'results',
-        root: 'rows',
-        id: 'id',
-        fields: [
-            {name: 'name'},
-            {name: 'occupation'}
-        ]
+        "idProperty": "id",
+        "root": "rows",
+        "totalProperty": "results"
+        "successProperty": "success",
+        "fields": [
+            {"name": "name"},
+            {"name": "job", "mapping": "occupation"}
+        ],
+        // used by store to set its sortInfo
+        "sortInfo":{
+           "field": "name",
+           "direction": "ASC"
+        },
+        // paging data (if applicable)
+        "start": 0,
+        "limit": 2,
+        // custom property
+        "foo": "bar"
     },
-    results: 2,
-    rows: [
-        { 'id': 1, 'name': 'Bill', occupation: 'Gardener' },
-        { 'id': 2, 'name': 'Ben', occupation: 'Horticulturalist' }
+    // Reader's configured successProperty
+    "success": true,
+    // Reader's configured totalProperty
+    "results": 2000,
+    // Reader's configured root
+    // (this data simulates 2 results per page)
+    "rows": [ // *Note: this must be an Array
+        { "id": 1, "name": "Bill", "occupation": "Gardener" },
+        { "id": 2, "name":  "Ben", "occupation": "Horticulturalist" }
     ]
-}
        

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Config Options

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Config OptionsDefined By
 
-        
-            id : String            

-                            Name of the property within a row object that contains a record identifier value.                        

-        		JsonReader
 
-        
-            root : String            

-                            name of the property which contains the Array of row objects.                        

-        		JsonReader
 
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-            successProperty : String            

-                            Name of the property from which to retrieve the success attribute used by forms.                        

-        		JsonReader

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PropertyDefined By
 
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-            meta : Mixed            

-                            This JsonReader's metadata as passed to the constructor, or as passed in
-the last data packet's metaData property.                        

-        		JsonReader

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Public Methods

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MethodDefined By
Public Events
This class has no public events.

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