How to verify the uniqueness of email and username using Ajax

This time I will show you how to use Ajax to verify the uniqueness of email and username. What are the precautions for using Ajax to verify the uniqueness of email and username? The following is a practical case. Let’s take a look. one time.

Without further ado, I will post the code directly for you. The specific code is as follows:

 <script type="text/javascript">
    $(function () { 
      $("#txtEmail").blur(function () {
        $.ajax({
          type: "post",
          url: "reg.ashx?email=" + $.trim($("#txtEmail").val()) + "&d=" + (+new Date()),
          success: function (data) {
            var vCount = parseInt(data);
            if (vCount == 0) {
              alert("邮箱可以使用");
            }
            else {
              alert("邮箱已经被占用");
            }
          }
        });
      });
      $("#checkpwd").blur(function () {
        return CheckPwd();
      });
    });
    function CheckPwd()
    {
      var bCheck = true;
      if ($.trim($("#pwd").val()) != $.trim($("#checkpwd").val()))
      {
        alert("两次密码输入不一致");
        bCheck = false;
      }
      return bCheck;
    }
  </script>

reg.ashx code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace WebT1.Ti.html2
{
  /// <summary>
  /// reg 的摘要说明
  /// </summary>
  public class reg : IHttpHandler
  {
    public void ProcessRequest(HttpContext context)
    {
      if (context.Request["email"] != null)
      {
        string strEmail = context.Request["email"];
        List<UserModel> lstUser = DataService.GetUserList();
        var v = lstUser.Where(p => p.Email == strEmail);
        int iCount = 0;
        if (v.Count() > 0)
        {
          iCount = 1;
        }
        context.Response.ContentType = "text/plain";
        context.Response.Write(iCount.ToString());
      }
    }
    public bool IsReusable
    {
      get
      {
        return false;
      }
    }
  }
  public class DataService
  {
    /// <summary>
    /// 模拟已注册用户数据
    /// </summary>
    public static List<UserModel> GetUserList()
    {
      var list = new List<UserModel>();
      list.Add(new UserModel() { Email = "t1@demo.com" });
      list.Add(new UserModel() { Email = "t2@demo.com" });
      list.Add(new UserModel() { Email = "t3@demo.com" });
      list.Add(new UserModel() { Email = "t4@demo.com" });
      list.Add(new UserModel() { Email = "t5@demo.com" });
      return list;
    }
  }
  public class UserModel
  {
    public string Email { get; set; }
  }
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of ajax and jsonp cross-domain (with code)

ajax should get json data as undefined how to use

The above is the detailed content of How to verify the uniqueness of email and username using Ajax. For more information, please follow other related articles on the PHP Chinese website!