Question

我试图在现场基本检查输入的电子邮件是否已经注册。试图做到这一点（我想在链接中做的一个例子，无法上传图片）：
http://2.bp.blogspot.com/-2gcqeLxtuOs/UTxEge1d9XI/AAAAAAAAAz8/79M9RyYRHZs/s1600/UserAvailability.gif

我似乎不明白我的代码有什么问题，可能缺乏知识或忽视某些东西。我的代码：

Register.aspx：

 function UserChecker(username) {

     lbl = document.getElementById('<%=Label2.ClientID %>');

     if (username == '') {
         lbl.innerHTML = 'Please Enter a User Name';
         lbl.style.color = "black";

     }
     else {

         PageMethods.UserNameChecker(username, OnSucceeded);
     }
 }

 function OnSucceeded(result, userContext, methodName)
  {

      lbl = document.getElementById('<%=Label2.ClientID %>');

      if (methodName == "UserNameChecker")
      {

          if (result == true)
          {
              lbl.innerHTML = 'User name not available';
              lbl.style.color = "red";
          }

          else
           {
              lbl.innerHTML = 'User name available';
              lbl.style.color = "green";
          }


     }


 }

<asp:Label ID="Label1" runat="server" Text="User Name"></asp:Label>
                <br />
                <asp:TextBox ID="email" runat="server" AutoPostBack="true" onkeyup="UserChecker(this.value)" style="font-size: 20px; text-align:center; border-radius: 20px;" class="RegisterButton" ValidationGroup="registergroup" placeholder="What's your Email?"></asp:TextBox>
                <br />
                <asp:Label ID="Label2" runat="server"></asp:Label>

Register.aspx.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

using System.Web.Services;

public partial class CheckUserAvailability : System.Web.UI.Page
{
    [WebMethod]
    public static bool UserNameChecker(string UserName)
    {

        if (WebUser.IsUserNameExist(UserName) == true)
        {
            return true;
        }
        else
        {
            return false;
        }

    }
}

WebUser.cs（我创建的一个类）：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.OleDb;

//Get the username if the entered user name is in the table.

public class WebUser
{

    public static bool IsUserNameExist(string UserName)
    {
        OleDbConnection objConnUser = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + HttpContext.Current.Server.MapPath("~") + @"\App_Data\Database.accdb" + "");
        objConnUser.Open();

        DataSet ds = new DataSet();
        DataTable dt = new DataTable();

        OleDbParameter objParam = new OleDbParameter();
        OleDbCommand objCmd = new OleDbCommand("CheckOnSpot", objConnUser);
        objCmd.CommandType = CommandType.StoredProcedure;

        objParam = new OleDbParameter("@UserName", OleDbType.Char);
        objParam.Value = UserName;
        objCmd.Parameters.Add(objParam);

        if (objCmd.ExecuteScalar() != null)
        {
            return true;
        }
        else
            return false;
    }
}

UsersInfo.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.OleDb;


    public class UsersInfo
    {
        public int UserID;
        public string firstname;
        public string email;
        public string password;
        public string lastname;
        public int age;
        public string phonenumber;
        public string picture;

        public UsersInfo()
        {

        }

    }

CheckOnSpot查询（无论如何都需要它）：

SELECT email
FROM users
WHERE email = [@UserName];

提前致谢。希望你能看到我错过的东西。

Answer 1

ASPX ADD：OnTextChanged =“email_TextChanged”

<asp:TextBox ID="email" runat="server" AutoPostBack="true" onkeyup="UserChecker(this.value)" style="font-size: 20px; text-align:center; border-radius: 20px;" class="RegisterButton" ValidationGroup="registergroup" placeholder="What's your Email?"  ></asp:TextBox>

背后的代码：

      protected void email_TextChanged(object sender, EventArgs e)
    {

        string email= email.Text;

            string conStr;
            conStr = ConfigurationManager.ConnectionStrings["cnSting_Con"].ConnectionString;
            SqlConnection con = new SqlConnection(conStr);
            con.Open();
            // WRITE STORED PROCEDURE TO CHECK EMAIl ID 
            SqlCommand cmd = new SqlCommand("CheckEmailExist  ", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add(new SqlParameter("@email", email));

            DataTable ds = new DataTable();
            SqlDataAdapter sd = new SqlDataAdapter(cmd);
            sd.Fill(ds);
            con.Close();

存储过程：编写程序[CheckEmailExist]

输入时检查电子邮件可用性

1 个答案: