Ext中的几种Reader(一)!

JSON:

//得到远程json对象
//其中jsoncallback.js内容为
//{ 'results': 2, 'rows': [
//    { 'id': 1, 'name': 'Bill', occupation: 'Gardener' },
//    { 'id': 2, 'name': 'Ben', occupation: 'Horticulturalist' } ]
//}
//定义proxy
      var proxy=new Ext.data.HttpProxy({url:'jsoncallback.js'});
//定义reader
      var reader=new Ext.data.JsonReader(
        {
        totalProperty: "results",//totalRecords属性由json.results得到
        root: "rows",            //构造元数据的数组由json.rows得到
        id: "id"                //id由json.id得到
        },[
        {name: 'name', mapping: 'name'},
        {name: 'occupation'}            //如果name与mapping同名,可以省略mapping
        ]
    )
//构建Store  
    var store=new Ext.data.Store({
      proxy:proxy,
      reader:reader
   });
//载入
store.load();

XML:

<?xml version="1.0" encoding="utf-8" ?>
<dataset>
  <results>2</results>
  <row>
    <id>1</id>
    <name>Bill</name>
    <occupation>Gardener</occupation>
  </row>
  <row>
    <id>2</id>
    <name>Ben</name>
    <occupation>Horticulturalist</occupation>
  </row>
</dataset>
/////////////////////////////////////
var proxy=new Ext.data.HttpProxy(...{url:'datasource.xml'});
  
    var reader = new Ext.data.XmlReader({
       totalRecords: "results",
       record: "row",       
       id: "id"               
    }, [
       {name: 'name', mapping: 'name'},
       {name: 'occupation'}          
    ]);
   var store=new Ext.data.Store({
      proxy:proxy,
      reader:reader
   });
store.load();