gridpanel动态加载数据的实例代码

<script type='text/javascript'>
function editEsOrder(options,success,response){
if (success){
var tagModelManager_maxOrderIdJson=Ext.util.JSON.decode(response.responseText);
var orderValue = tagModelManager_maxOrderIdJson.maxOrderId ;
Ext.getCmp('esorder').setValue(orderValue) ;
}
}
var tagModelManager_toolBar=new Ext.Toolbar({
items:[
{id:'tagModel_Save',text:'添加',iconCls:'add',handler:tagModel_Save}
,'-',
{id:'tagModel_dropSelected',text:'删除',iconCls:'remove',handler:tagModel_dropSelected}
]});
new Ext.grid.GridPanel({
id:'tagModelManager_tagModelGrid',
autoScroll:true,  store:new Ext.data.Store(),
cm:new Ext.grid.ColumnModel([new Ext.grid.RowNumberer()]),
sm:new Ext.grid.CheckboxSelectionModel(),
renderTo:'tagModelManager_tagModelDiv',
        width:Ext.getCmp('TagModel_win').getSize().width-16,
        height:Ext.getCmp('TagModel_win').getSize().height-35,
hideHeaders :false,
loadMask:{msg:'正在加载数据，请稍候....'},
collapsible : true,
collapsed : false,
bbar:new Ext.PagingToolbar({
id:'tagModelManager_tagModelPagingBar',
pageSize:getComboValue(),
store:new Ext.data.Store(),
displayInfo:true
}),
tbar:tagModelManager_toolBar
});
Ext.getCmp('tagModelManager_tagModelGrid').render() ;
Ext.getCmp('tagModelManager_tagModelGrid').on('rowdblclick', tagModelSelectRowDblClickEvent);
function tagModelSelectRowDblClickEvent(selectionModel, rowIndex, selectedRecord) {
  var selectedRows = Ext.getCmp('tagModelManager_tagModelGrid').getSelectionModel().getSelections();
      var row=selectedRows[0];   
      tagModel_SaveOrEdit('edit',row);
}
function tagModel_Save() {
      tagModel_SaveOrEdit('save');
}
function tagModelList_search() {
  Ext.Ajax.request({
  url:'editTagModel.html?method=getParams',
   callback:getSearchList
   });
}
function getSearchList(options,success,response) {
if (success){
var tagModelManager_json=Ext.util.JSON.decode(response.responseText);
tagModelManager_tagModelGridTitle = tagModelManager_json.tagModelManager_tagModelGridTitle;
var record = tagModelManager_json.record ;
var tagModelManager_tagModelColumnModels = tagModelManager_json.tagModelManager_tagModelColumnModels ;
        var tagModelManager_tagModelColumnModel=new Ext.grid.ColumnModel(Ext.util.JSON.decode("["+"new Ext.grid.RowNumberer()"+","+"new Ext.grid.CheckboxSelectionModel()"+","+tagModelManager_tagModelColumnModels+"]"));
tagModelManager_tagModelColumnModel.defaultSortable=true;
var strucutreModelManager_tagModelDataStore = new Ext.data.Store({
         baseParams: { tagModelKeyword : Ext.getCmp('tagModelManager_search_button').el.dom.value.trim() },
proxy:new Ext.data.HttpProxy({
url:'editTagModel.html?method=getTagModelDataList'
}),
reader:new Ext.data.JsonReader({
totalProperty:'resultSize',root:'tagModelList'},Ext.util.JSON.decode(record))  });
Ext.getCmp('tagModelManager_tagModelPagingBar').bind(strucutreModelManager_tagModelDataStore);
strucutreModelManager_tagModelDataStore.load({params:{start:0,limit:getComboValue()}}) ;
Ext.getCmp('tagModelManager_tagModelGrid').setTitle(tagModelManager_tagModelGridTitle) ;
Ext.getCmp('tagModelManager_tagModelGrid').reconfigure(strucutreModelManager_tagModelDataStore,tagModelManager_tagModelColumnModel);
Ext.getCmp('tagModelManager_tagModelGrid').expand(false) ;
}
}
function tagModelList_all(){
Ext.Ajax.request({
url:'editTagModel.html?method=getParams',
callback:getTagModel
});
}
function getTagModel(options,success,response){
if (success){
var tagModelManager_json=Ext.util.JSON.decode(response.responseText);
tagModelManager_tagModelGridTitle = tagModelManager_json.tagModelManager_tagModelGridTitle;
var record = tagModelManager_json.record ;
var tagModelManager_tagModelColumnModels = tagModelManager_json.tagModelManager_tagModelColumnModels ;
        var tagModelManager_tagModelColumnModel=new Ext.grid.ColumnModel(Ext.util.JSON.decode("["+"new Ext.grid.RowNumberer()"+","+"new Ext.grid.CheckboxSelectionModel()"+","+tagModelManager_tagModelColumnModels+"]"));
tagModelManager_tagModelColumnModel.defaultSortable=true;
var strucutreModelManager_tagModelDataStore = new Ext.data.Store({
proxy:new Ext.data.HttpProxy({
url:'editTagModel.html?method=getTagModelDataList'
}),
reader:new Ext.data.JsonReader({
totalProperty:'resultSize',root:'tagModelList'},Ext.util.JSON.decode(record))  });
Ext.getCmp('tagModelManager_tagModelPagingBar').bind(strucutreModelManager_tagModelDataStore);
strucutreModelManager_tagModelDataStore.load({params:{start:0,limit:getComboValue()}}) ;
Ext.getCmp('tagModelManager_tagModelGrid').reconfigure(strucutreModelManager_tagModelDataStore,tagModelManager_tagModelColumnModel);
Ext.getCmp('tagModelManager_tagModelGrid').expand(false) ;
}
}
Ext.Ajax.request({
url:'editTagModel.html?method=getParams',
callback:getTagModel
});
</script>
    public void getTagModelDataList(ActionMapping mapping, ActionForm actionform,HttpServletRequest request, HttpServletResponse response){
    ITagModelManager tagmgr = this.getPkgServer().getDriver().getOperateServer().getTagModelManager() ;
    List<HashMap<String,String>> models = new ArrayList<HashMap<String,String>>();
    String tagModelKeyword = request.getParameter("tagModelKeyword");
    List<EssTagModel> tagModels ;
    tagModels =  tagmgr.getEssTagModels() ;
    int resultSize = 0 ;
    if (null != tagModels && !tagModels.isEmpty()){
    //数据分页显示
    resultSize = tagModels.size() ;
    String start = request.getParameter("start") ;
String perPage = request.getParameter("limit") ;
String esType ="";
if (null != start && null != perPage){
int fromIdx = Integer.parseInt(start);
int per =  Integer.parseInt(perPage);
int toIdx = fromIdx + per ;
if (toIdx  > resultSize) toIdx = resultSize ;
tagModels = tagModels.subList(fromIdx,toIdx) ;
}
    for(EssTagModel etm : tagModels){
    HashMap<String,String> map = new HashMap<String, String>();
    map.put("id",   Long.toString(etm.getId())) ;
    map.put("esidentifier", etm.getEsidentifier()) ;
    map.put("estype", etm.getEstype()) ;
    map.put("esdescription", etm.getEsdescription()) ;
    map.put("esorder", Long.toString(etm.getEsorder())) ;
    map.put("metadata", etm.getMetadata()) ;
    models.add(map) ;
    }
    }
    JSONObject json = new JSONObject();
    JSONArray ary = new JSONArray(models);
    json.put("tagModelList", ary);
json.put("resultSize",resultSize);
    writeJson(response, json.toString()) ;
    }
public void getParams(ActionMapping mapping, ActionForm actionform,HttpServletRequest request, HttpServletResponse response){
LinkedHashMap<String,String> tags = new LinkedHashMap<String,String>() ;
tags.put("id", "id") ;
tags.put("esidentifier", "字段") ;
tags.put("estype", "类型") ;
tags.put("esdescription", "描述") ;
tags.put("esorder", "顺序") ;
tags.put("metadata", "元数据") ;
tags.put("esisnull", "是否为必填项") ;
tags.put("eslength", "字段长度") ;
tags.put("esdotlength", "小数点位数") ;
tags.put("esissystem", "是否为系统字段") ;
JSONObject json = new JSONObject();
json.put("record", getJsonRecord(tags)) ;
json.put("tagModelManager_tagModelColumnModels", getJsonColumnModel(tags)) ;
writeJson(response,json.toString());
}