Ext.data-GroupingStore/JsonStore/SimpleStore

[转载]Ext.data-GroupingStore/JsonStore/SimpleStore
Ext.data.GroupingStore
继承自Ext.data.Store,为Store增加了分组功能.其它用法与Store一致,惟一需要注意的是使用GroupingStore时必须指定sortInfo信息
增加了配置属性
groupField : String//用于分组的字段
groupOnSort : Boolean//如果为真,将依排序字段重新分组,默认为假
remoteGroup : Boolean//远程排序
当然也会多一个group方法
groupBy( String field, [Boolean forceRegroup] ) : void
顾名思义都是重新排序用的

下面是个简单的示例
   var arr=[ [1, '本', '拉登'], [2, '笨', '拉登'],[3, '笨', '拉灯'] ];
    var reader = new Ext.data.ArrayReader(
   ...{id: 0},
   [
    ...{name: 'name', mapping: 1},       
    ...{name: 'occupation', mapping: 2}  
    ]);
  
    var store=new Ext.data.GroupingStore(...{
      reader:reader,
      groupField:'name',
      groupOnSort:true,
      sortInfo:...{field: 'occupation', direction: "ASC"} //使用GroupingStore时必须指定sortInfo信息
   });
   store.loadData(arr);
 
   //GridPanel以后会讨论,这儿使用它是为了直观的表现GroupingStore
   var grid = new Ext.grid.GridPanel(...{
    ds: store,
    columns: [
        ...{header: "name", width: 20, sortable: true,dataIndex: 'name'},
        ...{header: "occupation", width: 20,sortable: true, dataIndex: 'occupation'}
    ],
    view: new Ext.grid.GroupingView(...{
        forceFit:true,
        groupTextTpl: '{text} ({[values.rs.length]} {[values.rs.length > 1 ? "Items" : "Item"]})'
    }),
    frame:true,
    width: 700,
    height: 450,
    collapsible: true,
    animCollapse: false,
    title: 'Grouping Example',
    renderTo: 'Div_GridPanel'
    });

Ext.data.JsonStore
也是Store子类,目标是更方便的使用json对象做数据源
构造中多了fields,root,用法如下例所示
/**//*
这是使用远程对象,返回内容与下面本地对象的data一致
var store=new Ext.data.JsonStore({
        url:'jsoncallback.js',
        root:'rows',
        fields:['id','name','occupation']
    });
    store.load();
*/
    var store=new Ext.data.JsonStore(...{
        data:...{ 'results': 2, 'rows': [
        ...{ 'id': 1, 'name': 'Bill', occupation: 'Gardener' },
        ...{ 'id': 2, 'name': 'Ben', occupation: 'Horticulturalist' }
        ]},
    autoLoad:true,
    root:'rows',
    fields:['id','name','occupation']
    })

    //目前请先略过gridpanel,以后再说
    var grid = new Ext.grid.GridPanel(...{
    ds: store,
    columns: [
        ...{header: "id", width: 200, sortable: true,dataIndex: 'id'},
        ...{header: "name", width: 200, sortable: true,dataIndex: 'name'},
        ...{header: "occupation", width: 200,sortable: true, dataIndex: 'occupation'}
    ],height:350,
      width:620,
      title:'Array Grid',
      renderTo: 'Div_GridPanel'
    });


Ext.data.SimpleStore
从数组对象更方便的创建Store对象,
例
var store=new Ext.data.JsonStore(...{
        data:[
           [1, 'Bill', 'Gardener'], [2, 'Ben', 'Horticulturalist']
            ],
        autoLoad:true,
        fields:[...{name: 'name', mapping: 1},...{name:'occupation',mapping:2}]
    })
    var grid = new Ext.grid.GridPanel(...{
    ds: store,
    columns: [
        ...{header: "name", width: 200, sortable: true,dataIndex: 'name'},
        ...{header: "occupation", width: 200,sortable: true, dataIndex: 'occupation'}
    ],height:350,
      width:620,
      renderTo: 'Div_GridPanel'
    });