EXT核心API详解(十二)--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'
});