Ext JS 分页

[color=red]转载请注明出处，谢谢。[/color]

最近在看Ext JS，写了一个使用ExtJS进行分页的程序，后台是jsp代码。

ExtJS 代码：
Ext.onReady(function(){

var sm = new Ext.grid.CheckboxSelectionModel();

var cm = new Ext.grid.ColumnModel([
new Ext.grid.RowNumberer(), //增加列模型
sm,
{header:'编号',dataIndex:'id',sortable:true},
{header:'名称',dataIndex:'name',sortable:true},
{header:'性别',dataIndex:'sex',sortable:true,renderer:function(value){
if(value=='male'){
return " <span style='color:red;font-weight:bold;'>红男 </span> <img src='image/user_male.png'>";
}else{
return " <span style='color:green;font-weight:bold;'>绿女 </span> <img src='image/user_female.png'>";
}
}},
{header:'描述',dataIndex:'descn',sortable:true}
]);
cm.defaultSortable = true;

var ds = new Ext.data.Store({
proxy: new Ext.data.HttpProxy({url:'fenye.jsp'}), //后台，数据来源
reader: new Ext.data.JsonReader({
totalProperty: 'totalProperty',
root: 'root'
},
[
{name: 'id',mapping:'id'},
{name: 'name',mapping:'name'},
{name:'sex',mapping:'sex'},
{name: 'descn',mapping:'descn'}
]),
remoteSort:true

});

var grid = new Ext.grid.GridPanel({
el: 'grid',
title:'Ext Grid Test',
width:450,
height:410,
trackMouseOver:false,
loadMask: {msg:'正在加载数据，请稍侯……'}, //装在数据时候显示
store:ds,
cm: cm,
sm:sm,
bbar: new Ext.PagingToolbar({
pageSize: 15,
store: ds,
displayInfo: true,
displayMsg: '当前显示 {0} - {1}条记录 /共 {2}条记录',
emptyMsg: "No topics to display"
})
});

grid.render();

ds.load({params:{start:0, limit:15}});

});


后台代码：fenye.jsp

<%
int TOTALCOUNT=100; //共有100条数据
String start = request.getParameter("start");
String limit = request.getParameter("limit");

int index = Integer.parseInt(start);
int pageSize = Integer.parseInt(limit);
String json = "{totalProperty:"+TOTALCOUNT+",root:[";
String sex = "";
int temp_count=0; //临时存储，后面要用到
if(pageSize+index>TOTALCOUNT) [color=green]//最后一页，如果超出总数，则以总数为大[/color]
temp_count=TOTALCOUNT;
else
temp_count=pageSize+index;
for (int i = index; i < temp_count; i++) {
if (i % 2 == 0) {
sex = "male";
} else {
sex = "female";
}
json += "{id:" + i + ",name:'" + i + "',sex:'" + sex
+ "',descn:'descn" + i + "'}";
if (i != temp_count - 1) {
json += ",";
}
}
json += "]}";
response.getWriter().write(json);
response.getWriter().close(); [color=green]//必须将流关闭，才能显示数据，否则数据无法显示[/color]

System.out.print(json);
%>

好了，第一个小例子，下一个例子时候，将从数据库中读取数据。