Asp.net回調技術Callback學習

2019-11-17 01:40:07

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asp.net回調技術Callback學習

.aspx:

Html代碼

<%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Default.aspx.cs"Inherits="_Default"%>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>無標題頁</title>
<scrjavascript">
//向服務器傳遞參數
functionDoSearch(){
varfirstName=document.getElementById("TextBox1").value;
CallServer(firstName,"");
}
//得到服務器的數據
functionReceiveServerData(txtUserInfo){
Results.innerHTML=txtUserInfo;
}
//設置每1秒執行一次
setInterval("DoSearch()",1000);
</script>
</head>
<body>
<formid="form1"runat="server">
<div>
姓名:<asp:TextBoxID="TextBox1"runat="server"></asp:TextBox>
<br/>
<spanid="Results"style="width:500px;"></span>
</div>
</form>
</body>
</html>

.aspx.cs

C#代碼

<scripttype="text/Javascript">
functionOnCallBack(txtUserInfo,context){
Results.innerHTML=txtUserInfo;
}
</script>
</head>
<body>
<formid="form1"runat="server">
<div>
姓名:<asp:TextBoxID="TextBox1"runat="server"></asp:TextBox>
<inputid="Button2"type="button"value="button"
onclick="<%=Page.ClientScript.GetCallbackEventReference(this,"document.getElementById('TextBox1').value","OnCallBack",null)%>"/>
<br/>
<spanid="Results"style="pink;width:500;"></span>
</div>
</form>
</body>
</html>

.aspx.cs

C#代碼

usingSystem;
usingSystem.Collections;
usingSystem.Configuration;
usingSystem.Data;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.HtmlControls;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Data.SqlClient;
usingSystem.Text;
publicpartialclass_Default:System.Web.UI.Page,ICallbackEventHandler
{
protectedStringBuildertxtUserInfo;
protectedvoidPage_Load(objectsender,EventArgse)
{
}
publicstringGetCallbackResult()
{
returntxtUserInfo.ToString();
}
publicvoidRaiseCallbackEvent(stringtxtFirstName)
{
txtUserInfo=newStringBuilder();
StringconnString=ConfigurationManager.ConnectionStrings["sqlserver2008"].ToString();
SqlConnectionconn=newSqlConnection(connString);
conn.Open();
SqlCommandcomm=newSqlCommand("select*fromzzxwhere[name]=@name",conn);
comm.Parameters.Add("@name",SqlDbType.VarChar).Value=txtFirstName;
SqlDataReaderreader=comm.ExecuteReader(CommandBehavior.CloseConnection);
if(reader.Read())
{
txtUserInfo.Append("員工編號:"+reader["id"].ToString()+"<br>");
txtUserInfo.Append("員工姓名:"+reader["name"].ToString()+"<br>");
txtUserInfo.Append("地址:"+reader["address"].ToString()+"<br>");
txtUserInfo.Append("查詢時間:"+DateTime.Now.ToString());
}
else
{
if(txtFirstName==string.Empty)
{
txtUserInfo.Append("請輸入姓名");
}
else
{
txtUserInfo.Append("查無此人");
}
reader.Dispose();
comm.Dispose();
conn.Dispose();
}
}
}

示例3:

Html代碼

<%@PageLanguage="C#"AutoEventWireup="true"CodeFile="Default3.aspx.cs"Inherits="Default3"%>
<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<htmlxmlns="http://www.w3.org/1999/xhtml">
<headrunat="server">
<title>無標題頁</title>
<scripttype="text/javascript">
//客戶端執行的方法
//下面的方法是接收并處理服務器方法返回的結果
functionSuccess(args,context){
message.innerHTML=args;
}
//下面的方式是當接收服務器方法處理的結果發生異常時調用的方法
functionError(){
message.innerHTML="發生了異常!";
}
</script>
</head>
<body>
<formid="form1"runat="server">
<div>
用戶名:<inputtype="text"id="txtUserName"onblur="CallServerMethod(txtUserName.value,nu