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ASP.Net+Ajax實現無刷驗證(原創)

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輸入頁面:

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

<!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 id="Head1" runat="server">
    <title>輸入頁面</title>
</head>

<script language="javascript">
   var xmlHttp;
   function createXMLHttpRequest()
        {
    
           if(window.ActiveXObject)
               xmlHttp=new window.ActiveXObject("Microsoft.XMLHttp");
           else if(window.XMLHttpRequest)
               xmlHttp=new window.XMLHttpRequest();
 
        }

   function startRequest()
    {
          var url="EX_Ajax_Check.aspx?UniqueID="+document.form1 .TextBox1.value;
    createXMLHttpRequest();
    xmlHttp.OnReadyStateChange=HandleStateChange;
    xmlHttp.open("Get",url,true);
    xmlHttp.send(null);
  
    }
   
 function HandleStateChange()
  {
     if(xmlHttp.ReadyState==4)
     {
     if(xmlHttp.Status==200)
     {
        try
        {
           simple();
        }
        catch (exception)
        {
         alert("error");
        }
       
     }
     }

  }

 function simple()
 {
     var response = xmlHttp.responseText;
     alert(response);
 }
 
 
</script>

<body>
    <form id="form1" runat="server">
        <div>
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /><br />
            <br />
            <br />
            <asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="~/Data/Blog.mdb"
                SelectCommand="SELECT [UniqueID], [DTitle], [DPostDate] FROM [Daily]"></asp:AccessDataSource>
        </div>
        <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
            AutoGenerateColumns="False" DataKeyNames="UniqueID" DataSourceID="AccessDataSource1">
            <Columns>
                <asp:BoundField DataField="UniqueID" HeaderText="UniqueID" InsertVisible="False"
                    ReadOnly="True" SortExpression="UniqueID" />
                <asp:BoundField DataField="DTitle" HeaderText="DTitle" SortExpression="DTitle" />
                <asp:BoundField DataField="DPostDate" HeaderText="DPostDate" SortExpression="DPostDate" />
            </Columns>
        </asp:GridView>
    </form>
</body>
</html>

Button添加:Button1.Attributes.Add("onclick", "javascript:startRequest();");

驗證頁面:

        Response.Clear();
        string temp = Request.QueryString["UniqueID"].Trim ();

        if (temp != null)
        {
            string connectstring = "provider=Microsoft.jet.oledb.4.0;data source=" + Server.MapPath("../data/blog.mdb");
            OleDbConnection conn = new OleDbConnection(connectstring);
            conn.Open();
            string sql = "select count(*) as num from daily where UniqueID=" + temp + "";

            OleDbCommand cmd = new OleDbCommand(sql, conn);
            int i = Convert.ToInt16(cmd.ExecuteScalar());
            if (i > 0)
            {
                Response.Write("已存在");
            }
            else
            {
                Response.Write("不存在!");
            }
   

 

        }
        Response.End();

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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