exxt demo

function GetInvoices(record, expander, callback) {
    Ext.Ajax.request( {
      url : 'getDetailInvoices.json',
     params : {
       'chkNo' : record.data.chkNo,
       'vendorNo' : record.data.vendNo
     },
      success : function(response) {
       var data = Ext.decode(response.responseText);
       if (!data.success) {
       showError(data.message, checkBooks);
        return true;
      }
       // 设置模板中所需要的record数据，并展开该行
     record.data.checkSignerInvoicess = data.records;
     record.commit();

      if (callback) {
       callback(expander);// 一定要回调该函数，否则不能展开
    }
   },
    failure : function() {
     if (callback) {
     callback(expander);
    }
   }
    })
   }
   ;