您的位置：首页 > Web前端 > JavaScript

今天遇到个很怪的问题。。。js dom的，浏览器作怪

2007-08-04 12:23 239 查看

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">

function DoSearch()

...{

var txtFirstName=document.getElementById("txtUsrName");

CallServer(txtFirstName.value,"");

}

function ReceiveServerData(txtUsrInfo)

...{

Results.innerText=txtUsrInfo;

}

setInterval('DoSearch()',1000);

</script>

</head>

<body>

<div>

姓名：<input id="txtUsrName" style="position: static" type="text" />

<br />

</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">

function OnCallback(txtUsrInfo,context)

...{

alert(txtUsrInfo);

Results.innerText=txtUsrInfo;

}

</script>

</head>

<body>

<div>

name:<input id="txtUsrName" style="position: static" type="text" />

</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。。。

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签： 浏览器 xmlhttprequest string webform null server

相关文章推荐

新的分享

章节导航