Client-Callback非同步数据查询

最新推荐文章于 2025-08-07 23:59:18 发布

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最新推荐文章于 2025-08-07 23:59:18 发布

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CC 4.0 BY-SA版权

文章标签： ui xhtml javascript ViewUI

原文链接：http://www.cnblogs.com/qiuweiguo/archive/2011/08/04/2127398.html

本文介绍了一个使用ASP.NET实现客户端回调功能的例子。通过按钮点击触发JavaScript回调，将输入框中的内容传递给服务器进行处理，并更新页面显示结果。

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页面代码：

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/JavaScript">
        function OnCallback(txtUserInfo, context) {
            document.getElementById("Results").innerText = txtUserInfo;
        }
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<h2>
            Client-Callback非同步数据查询</h2>
        姓名：<input id="txtUserName" type="text" />
<input id="btnCallback" type="button" 
        value="Callback" onclick="<%= ClientScript.GetCallbackEventReference(this,"document.getElementById('txtUserName').value","OnCallback",null) %>" /><br />
<div id="Results" style="background-color: pink">
</div>
</div>
</form>
</body>
</html>

后台代码：

    public partial class WebForm1 : System.Web.UI.Page, System.Web.UI.ICallbackEventHandler
    {
protected string txtUserInfo;    //用户基本数据
        protected void Page_Load(object sender, EventArgs e)
        {

        }

public string GetCallbackResult()
        {
return txtUserInfo;
        }

public void RaiseCallbackEvent(string eventArgument)
        {
if (eventArgument != null)
            {
//SqlConnection conn = new SqlConnection("data source=.;initial catalog=Northwind;user id=sa;password=missoft");
//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 = eventArgument;
//SqlDataReader dr = cmd.ExecuteReader();

//if (dr.Read())
//{
//    txtUserInfo = "员工编号：" + dr["EmployeeID"] + "\r\n";
//    txtUserInfo += "姓名：" + dr["FirstName"] + "\r\n";
//    txtUserInfo += "居住城市：" + dr["City"] + "\r\n";
//    txtUserInfo += "地址：" + dr["Address"].ToString().Replace("\r\n", "") + "\r\n";
//    txtUserInfo += "服务器查询时间：" + DateTime.Now.ToLongTimeString();
//}
//else
//{
                    if (String.IsNullOrEmpty(eventArgument))
                    {
                        txtUserInfo = "请输入姓名";
                    }
else
                    {
                        txtUserInfo = "查无此人！";
                    }
//}
            }
        }
    }