extjs 动态表格

var videoWin_c;
function VideoWin_c(recInfos,channum){
 //定义列
 var fieldDatas="{'columModle':[";
 fieldDatas +="{'header':'星期/通道','dataIndex':'head','width':80},"
 for(var i=1;i<channum+1;i++)
 {
  if(i<channum)
   fieldDatas+="{'header':'通道'+"+i+",'dataIndex':'chan'+"+i+",'width':100},";
  else
   fieldDatas+="{'header':'通道'+"+i+",'dataIndex':'chan'+"+i+",'width':100}";
 }

 fieldDatas += "],'fieldsNames':[";
 fieldDatas += "{'name':'head'},"
 for(var i=1;i<channum+1;i++)
 {
  if(i<channum)
   fieldDatas+="{'name':'chan'+"+i+"},";
  else
   fieldDatas+="{'name':'chan'+"+i+"}";
 }

 fieldDatas+="]}";

   var json = new Ext.util.JSON.decode(fieldDatas); 
   var cm = new Ext.grid.ColumnModel(json.columModle);

 //加载数据
 var day=recInfos.split(";");
 
 var data=new Array();
 for(var i=0;i<7;i++)
 {
  data[i]=new Array();
  for(j=0;j<channum;j++)
  {
   data[i][0]="星期"+(i+1);
   data[i][j+1]=day[j].split("@")[i];
  }
 }

  var store = new Ext.data.SimpleStore({
       fields: json.fieldsNames
     });
  store.loadData(data);

 if(videoWin_c){
  videoWin_c.destroy();
 }
 videoWin_c  =   new  Ext.Window({
        title:"录像状态",
        x:150,
      y:50,
        width: 800,
      height:250,
  autoSrcoll:true,
  //autoWidth:true,
  //autoHeight:true,
  layout:'form', 
  items:[
  new Ext.grid.GridPanel({
    renderTo:Ext.getBody(),
    stripeRows: true,
    store:store,
   // ds: ds,
    cm: cm,
    width:780,
    height:200,
    //autoWidth:true,
    autoSrcoll:true
    //autoHeight:true
   })
  ]
    }); 
 videoWin_c.show();
}

在使用forceFit后，表格的右边的空白区域正好比纵向滚动条宽一点，在高度超出屏幕或者表格高度时可以保证只会出现纵向滚动条，而不会出现横向滚动条。

viewConfig:{

forceFit:true

}