Ext2.0的Grid控件学习2
其它两种数据的Grid显示是相同的，其不同之处在于数据获取的过程：
1.Json数据，至于这种数据的类型请大家自己看Ajax的书籍：
//JsonData
var data = {
'coders': [
{ 'id': '1', 'sex': 'male', 'name':'McLaughlin', 'descn': 'brett@newInstance.com' },
{ 'id': '2', 'sex': 'male','name':'Hunter', 'descn': 'jason@servlets.com' },
{ 'id': '3', 'sex': 'female','name':'Harold', 'descn': 'elharo@macfaq.com' },
{ 'id': '4', 'sex': 'male','name':'Harolds', 'descn': 'elhaross@macfaq.com' }
],
'musicians': [
{ 'id': '1', 'name': 'Clapton', 'descn': 'guitar' },
{ 'id': '2', 'name': 'Rachmaninoff', 'descn': 'piano' }
]
}
//ds使用的MemoryProxy对象和JsonReader对象
var ds = new Ext.data.Store({
proxy: new Ext.data.MemoryProxy(data),
reader: new Ext.data.JsonReader({root: 'coders'}, [
{name: 'id'},
{name: 'sex'},
{name: 'name'},
{name: 'descn'}
])
});
ds.load();
var grid = new Ext.grid.GridPanel({
el: 'grid3',
ds: ds,
cm: cm,
sm: sm,
title: 'HelloWorld',
autoHeight: true//一定要写，否则显示的数据会少一行
});
grid.render();
2.使用XML数据：
XML数据test.xml的内容：
<?xml version="1.0" encoding="UTF-8"?>
<dataset>
<results>2</results>
<item>
<id>1</id>
<sex>male</sex>
<name>Taylor</name>
<descn>Coder</descn>
</item>
</dataset>var ds3 = new Ext.data.Store({
url: 'test.xml', //XML数据
reader: new Ext.data.XmlReader({record: 'item'}, [ //使用XmlReader对象
{name: 'id'},
{name: 'sex'},
{name: 'name'},
{name: 'descn'}
])
});
3.从服务器获取数据
从一个服务器文件，如ASP、JSP或Servlet中获得数据二维Array、JSON或XML数据，也可以被Ext读取，并被Grid显示：
服务器文件data.asp:
<%
start = cint(request("start"))
limit = cint(request("limit"))
dim json
json=cstr("{totalProperty:100,root:[")
for i = start to limit + start-1
json =json + cstr("{'id':'") +cstr(i) + cstr("','name':'name") + cstr(i) + cstr("','descn':'descn") + cstr(i) + cstr("'}")
if i <> limit + start - 1 then
json =json + ","
end if
next
json = json +"]}"
response.write(json)
%>
我们可以看到，这个页面会根据传入的start和limit的不同，返回不同的数据，其实质是个分页的代码。下面是start=0,limit=10的JSON数据：
{totalProperty:100,root:[{'id':'0','name':'name0','descn':'descn0'},{'id':'1','name':'name1','descn':'descn1'},{'id':'2','name':'name2','descn':'descn2'},{'id':'3','name':'name3','descn':'descn3'},{'id':'4','name':'name4','descn':'descn4'},{'id':'5','name':'name5','descn':'descn5'},{'id':'6','name':'name6','descn':'descn6'},{'id':'7','name':'name7','descn':'descn7'},{'id':'8','name':'name8','descn':'descn8'},{'id':'9','name':'name9','descn':'descn9'}]}
我们使用分页控件来控制Grid的数据：
Ext.onReady(function(){
var sm = new Ext.grid.CheckboxSelectionModel();
var cm = new Ext.grid.ColumnModel([
new Ext.grid.RowNumberer(),
sm,
{header:'编号',dataIndex:'id'},
{header:'性别',dataIndex:'sex'},
{header:'名称',dataIndex:'name'},
{header:'描述',dataIndex:'descn'}
]);
cm.defaultSortable = true;
var ds = new Ext.data.Store({
proxy: new Ext.data.HttpProxy({url:'data.asp'}),
reader: new Ext.data.JsonReader({
totalProperty: 'totalProperty',
root: 'root'
}, [
{name: 'id'},
{name: 'name'},
{name: 'descn'}
])
});
ds.load({params:{start:0,limit:10}});
var grid = new Ext.grid.GridPanel({
el: 'grid3',
ds: ds,
cm: cm,
sm: sm,
title: 'ASP->JSON',
bbar: new Ext.PagingToolbar({
pageSize: 10,
store: ds,
displayInfo: true,
displayMsg: '显示第 {0} 条到 {1} 条记录，一共 {2} 条',
emptyMsg: "没有记录"
}),
tbar: new Ext.PagingToolbar({
pageSize: 10,
store: ds,
displayInfo: true,
displayMsg: '显示第 {0} 条到 {1} 条记录，一共 {2} 条',
emptyMsg: "没有记录"
})
});
grid.render();
})
4.如何在Grid的上方添加按钮呢？
var grid = new Ext.grid.GridPanel({
el: 'grid3',
ds: ds,
cm: cm,
sm: sm,
title: 'HelloWorld',
tbar: new Ext.Toolbar({
items:[
{
id:'buttonA'
,text:"Button A"
,handler: function(){ alert("You clicked Button A"); }
}
,
new Ext.Toolbar.SplitButton({})
,{
id:'buttonB'
,text:"Button B"
,handler: function(){ alert("You clicked Button B"); }
}
,
'-'
,{
id:'buttonc'
,text:"Button c"
}
]
})
});
6.将GridPanel放入一个Panel或TabPanel中
var tabs = new Ext.TabPanel({
collapsible: true
,renderTo: 'product-exceptions'
,width: 450
,height:400
,activeTab: 0
,items:[
{
title: 'Unmatched'
},{
title: 'Matched'
}
]
});
tabs.doLayout();
var panel = new Ext.Panel({
renderTo: 'panel',
title:'panel',
collapsible:true,
width:450,
height:400,
items:[grid] //管理grid
});
Panel必须有DIV存在。其包含的Component有items管理。
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