今天遇到个很怪的问题。。。js dom的，浏览器作怪

放假了，哎。。。一休息就是这么多天～～～

开始努力学习了

今天练习使用Callback，在对于却在dom上出了问题。

首先，下面这个例子是 正确的。

ClientCallbacks.aspx

<% ... @ Page Language="C#" AutoEventWireup="true" CodeFile="ClientCallbacks.aspx.cs" Inherits="ClientCallbacks"  %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head  runat ="server" >
     < title > 无标题页 </ title >
     < script  language ="javascript" > ...
    function DoSearch()
    ...{
        var txtFirstName=document.getElementById("txtUsrName");
        CallServer(txtFirstName.value,"");
    }
    function ReceiveServerData(txtUsrInfo)
    ...{
        Results.innerText=txtUsrInfo;
    }
    setInterval('DoSearch()',1000);
     </ script >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
     < div >
        姓名： < input  id ="txtUsrName"  style ="position: static"  type ="text"   />
     < br  />
     < span  id ="Results"  style ="background-color:Pink; width:500px;" ></ span >
     </ div >
     </ form >
</ body >
</ html >

ClientCallbacks.aspx.cs

 

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;

using  System.Data.SqlClient;

public   partial   class  ClientCallbacks : System.Web.UI.Page,ICallbackEventHandler
... {
    protected string txtUsrInfo;

    protected void Page_Load(object sender, EventArgs e)
    ...{
        string cbReference = Page.ClientScript.GetCallbackEventReference(this, "arg", "ReceiveServerData", "context");
        string callbackScript = "function CallServer(arg,context)" + "{ " + cbReference + " };";
        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "CallServer", callbackScript, true);
    }

    //trigger callback event
    public void RaiseCallbackEvent(string txtFirstName)
    ...{
        if (txtFirstName != null)
        ...{
            SqlConnection conn = new SqlConnection("data source=./SQLEXPRESS;initial catalog=Northwind;user id=sa;password=mssqlfs");
            conn.Open();

            SqlCommand cmd = new SqlCommand("select EmployeeID,FirstName,City,Address from Employees where FirstName=@FirstName", conn);
            cmd.Parameters.Add("@FirstName", SqlDbType.NVarChar, 10).Value = txtFirstName;
            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.Read())
            ...{
                txtUsrInfo = "员工代号：" + dr["EmployeeID"] + " ," +
                    "姓名：" + dr["FirstName"] + " ," +
                    "居住地址：" + dr["City"] + " ," +
                    "地址：" + dr["Address"].ToString().Replace(" ", "") + " ," +
                    "服务器查询时间：" + DateTime.Now.ToLongTimeString();

            }
            else
            ...{
                if (String.IsNullOrEmpty(txtFirstName))
                ...{
                    txtUsrInfo = "请输入姓名";
                }
                else
                ...{
                    txtUsrInfo = "查无此人!";
                }

            }
            cmd.Dispose();
            dr.Dispose();
            conn.Dispose();
        }
    }

    public string GetCallbackResult()
    ...{
        return txtUsrInfo;
    }
}

 

------------------------------------------------------------------------------------------------------------------

然后，下面这个却出了小问题。

ClientCallbackSimple.aspx

 

<% ... @ Page Language="C#" AutoEventWireup="true" CodeFile="ClientCallbacksSimple.aspx.cs" Inherits="ClientCallbacksSimple"  %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head  runat ="server" >
     < title > cccc </ title >
     < script  type ="text/javascript" > ...
    function OnCallback(txtUsrInfo,context)
    ...{
       alert(txtUsrInfo);
       Results.innerText=txtUsrInfo;
    }
    
     </ script >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
     < div >
        name: < input  id ="txtUsrName"  style ="position: static"  type ="text"   />
         < input  id ="btnCallback"  style ="position: static"  type ="button"  value ="button"  onclick ="<%=ClientScript.GetCallbackEventReference(this," document.form1.txtUsrName.value","OnCallback",null) % > " /> < br  />
         < div  id ="Results" ></ div >
     </ div >
     </ form >
</ body >
</ html >

ClientCallbackSimple.aspx.cs

 

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;
using  System.Data.SqlClient;

public   partial   class  ClientCallbacksSimple : System.Web.UI.Page,System.Web.UI.ICallbackEventHandler
... {
    protected string txtUsrInfo;

    protected void Page_Load(object sender, EventArgs e)
    ...{
    }
    //trigger callback event
    public void RaiseCallbackEvent(string txtFirstName)
    ...{
        if (txtFirstName != null)
        ...{
            SqlConnection conn = new SqlConnection("data source=./SQLEXPRESS;initial catalog=Northwind;user id=sa;password=mssqlfs");
            conn.Open();

            SqlCommand cmd = new SqlCommand("select EmployeeID,FirstName,City,Address from Employees where FirstName=@FirstName", conn);
            cmd.Parameters.Add("@FirstName", SqlDbType.NVarChar, 10).Value = txtFirstName;
            SqlDataReader dr = cmd.ExecuteReader();

            if (dr.Read())
            ...{
                txtUsrInfo = "员工代号：" + dr["EmployeeID"] + " ," +
                    "姓名：" + dr["FirstName"] + " ," +
                    "居住地址：" + dr["City"] + " ," +
                    "地址：" + dr["Address"].ToString().Replace(" ", "") + " ," +
                    "服务器查询时间：" + DateTime.Now.ToLongTimeString();

            }
            else
            ...{
                if (String.IsNullOrEmpty(txtFirstName))
                ...{
                    txtUsrInfo = "请输入姓名";
                }
                else
                ...{
                    txtUsrInfo = "查无此人!";
                }

            }
            cmd.Dispose();
            dr.Dispose();
            conn.Dispose();
        }
    }

    public string GetCallbackResult()
    ...{
        return txtUsrInfo;
    }
}

用firebug显示出的错误是：

 

 

 

POST http://localhost/SutraWay/ClientCallbacksSimple.aspx (5140ms) WebResource.axd (line 87)

Results is not defined

OnCallback( "请输入姓名" , null ) ClientCallbacksSi... (line 13)

WebForm_ExecuteCallback( Object async=false xmlRequest=XMLHttpRequest ) WebResource.axd (line 204)

WebForm_CallbackComplete() WebResource.axd (line 162)

 Results.innerText=txtUsrInfo;

ClientCallbacksSi... (line 13)

async	false
context	null
errorCallback	null
xmlRequest	XMLHttpRequest
eventCallback	OnCallback(txtUsrInfo, context)

但是我定义了啊。。。而且aspx文件和第一个正常显示的网页（ClientCallbacks.aspx）几乎一样，关于

Results.innerText语句并没有变化。

问题解决：

我给VS设的默认浏览器是FIREFOX，突然我想会不会是浏览器的问题，

我用IE打开后，果然，正确显示。。。