grid按页查询

Ext.onReady(function(){
 var sm = new Ext.grid.CheckboxSelectionModel();//显示选择框
 var cm = new Ext.grid.ColumnModel([
  new Ext.grid.RowNumberer(),//显示行号
  sm,//显示选择框
  {
    header : "姓名",// 列头文字说明
    width : 80,
    dataIndex : "Name",// 记录结构中的name属性值
    tooltip : "这是你的姓名"// 悬停提示
   }, {
    header : "性别",
    width : 40,
    dataIndex : "Sex",
    align : "center",
    renderer : function(v) {
     if (v == "男") {
      return "<img src='imgs/boy.gif'>";
     } else {
      return "<img src='imgs/girl.gif'>";
     }
    }
   }, {
    header : "生日",
    width : 150,
    format : "Y-m-d",
    dataIndex : "Birthday",
    renderer : Ext.util.Format.dateRenderer("Y-m-d")
   }, {
    header : "学历",
    width : 80,
    dataIndex : "Education",
    align : "center"
   }, {
    id : "memo",
    header : "备注",
    dataIndex : "Memo"
   }, {
    header : "操作",
    width : 150,
    dataIndex : "Operation",
    menuDisabled : true,
    renderer : function(v) {
     return "<sapn style='margin-right:10px'><a href='#'>修改</a></span>"
       + "<span><a href='#'>删除</a></span>";
    }
   }
 ]);
 
 // 给每个列添加数据
 var data = [{
    name : "学生A",
    sex : "男",
    birthday : Date.parseDate("1987-12-08", "Y-m-d"),
    edu : "本科",
    memo : "无备注"
   }, {
    name : "学生B",
    sex : "女",
    birthday : Date.parseDate("1974-04-23", "Y-m-d"),
    edu : "大专",
    memo : "漂亮MM"
   }, {
    name : "学生C",
    sex : "女",
    birthday : Date.parseDate("1978-05-17", "Y-m-d"),
    edu : "硕士",
    memo : "无备注"
   }, {
    name : "学生D",
    sex : "女",
    birthday : Date.parseDate("1988-07-14", "Y-m-d"),
    edu : "硕士",
    memo : "无备注"
   }];

 // proxy
 var proxy = new Ext.data.MemoryProxy(data);

 // 定义记录结果
 var Human = Ext.data.Record.create([{
    name : "Name",
    type : "string",
    mapping : "name"
   }, {
    name : "Sex",
    type : "string",
    mapping : "sex"
   }, {
    name : "Birthday",
    type : "string",
    mapping : "birthday"
   }, {
    name : "Education",
    type : "string",
    mapping : "edu"
   }, {
    name : "Memo",
    type : "string",
    mapping : "memo"
   }, {
    name : "Operation",
    type : "string"
    // mapping:"oper"
  }]);

 var reader = new Ext.data.JsonReader({}, Human);

 //提供数据源
 var store = new Ext.data.Store({
    proxy : proxy,
    reader : reader
   });

 store.load();
 var grid = new Ext.grid.GridPanel({
  title:"学生信息",
  width:700,
  autoHeight:true,
  cm:cm,
  sm:sm,
  store:store,
  renderTo:"a",
  autoExpandColumn:"memo",//自动伸展
  buttonAlign:"center",
  buttons:[{
   text:"第一行",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到行选择模型
    rsm.selectFirstRow();
   }
  },{
   text:"上一行",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到选择行的模型
    if(!rsm.hasPrevious()){
     Ext.Msg.alert("警告","已到达第一行");
    }else{
     rsm.selectPrevious();
    }
   }
  },{
   text:"下一行",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到行选择模型
    if(!rsm.hasNext()){
     Ext.Msg.alert("警告","已到达最后一行");
    }else{
     rsm.selectNext()
    }
   }
  },{
   text:"最后一行",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到行选择模型
    rsm.selectLastRow();
   }
  },{
   text:"全选",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到行选择模型
    rsm.selectAll();
   }
  },{
   text:"全不选",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到行选择模型
    rsm.deselectRange(0,grid.getView().getRows().length - 1);
   }
  },{
   text:"反选",
   handler:function(){
    var rsm = grid.getSelectionModel();//得到行选择模型
    for (var i = grid.getView().getRows().length - 1; i >= 0; i--) {
     if(rsm.isSelected(i)){
      rsm.deselectRow(i);
     }else{
      rsm.selectRow(i,true);//必须保留原来的，否则效果无法是实现
     }
    }
   }
  }]
  
 });
})