What should you pay attention to when calling webservice with ajax?

This article mainly introduces the precautions for jQuery ajax calling webservice in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

A few things to note when calling webservice (C#) with jquery ajax:

1. Two places need to be configured in web.config

<httpHandlers>
   <remove verb="*" path="*.asmx"/>
   <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
  </httpHandlers>

Add

##

<webServices>
   <protocols>
    <add name="HttpPost" />
    <add name="HttpGet" />
   </protocols>
  </webServices>

between 2dc15ec6bc814c3aa45b55d017848bed4ec4537ca3582453b3a7c44816bcf480 2. Write the code of webserivce correctly

##

/// <summary>
  /// UserValidate 的摘要说明
  /// </summary>
  [WebService(Namespace = "http://tempuri.org/")]
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
  [System.ComponentModel.ToolboxItem(false)]
  // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
   [System.Web.Script.Services.ScriptService]
  public class UserValidate : System.Web.Services.WebService
  {
    DFHon.Content.Common.rootPublic rp = new DFHon.Content.Common.rootPublic();
    [WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public string ValidateUserLogState()
    {
      string result = "";
      HttpCookie cookie = HttpContext.Current.Request.Cookies["DHFonMenberInfo"];
      if (cookie != null)
      {
        string username = System.Web.HttpUtility.UrlDecode(cookie["MenberName"]);
        int ipoint = 0;
        int gpoint = 0;
        try
        {
          DataTable dt = UserBll.ExecuteUserAllInfo(username);

          if (dt.Rows.Count > 0)
          {
            ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString());
            gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString());
          }
        }
        catch
        { }
        result = "{&#39;user&#39;:{&#39;id&#39;:&#39;" + cookie["UserId"] + "&#39;,&#39;name&#39;:&#39;" + username + "&#39;,&#39;message&#39;:&#39;" + rp.getUserMsg(DFHon.Global.CurrentCookie.UserName) + "&#39;,&#39;ipoint&#39;:&#39;" + ipoint.ToString() + "&#39;,&#39;gpoint&#39;:&#39;" + gpoint.ToString() + "&#39;}}";
      }
      else
      {
        result = "{&#39;user&#39;:{&#39;id&#39;:&#39;0&#39;,&#39;name&#39;:&#39;&#39;,&#39;message&#39;:&#39;0&#39;,&#39;ipoint&#39;:&#39;0&#39;,&#39;gpoint&#39;:&#39;0&#39;}}";
      }
      return result;
    }

    [WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public string UserLogin(string userName, string userPwd)
    {
      string returnVal = "";
      try
      {
        GlobalUserInfo info;
        DFHon.Content.UserLogin _UserLogin = new DFHon.Content.UserLogin();
        EnumLoginState state = _UserLogin.PersonLogin(HttpUtility.UrlDecode(userName), userPwd, out info);
        if (state == EnumLoginState.Succeed)
        {
          DFHon.Global.CurrentCookie.Set(info);
          DFHon.API.PDO.DiscuzNT.PassportLogin.UserLogin(Server.UrlDecode(userName), userPwd, -1);
          int ipoint = 0;
          int gpoint = 0;
          DataTable dt = UserBll.ExecuteUserAllInfo(userName);

          if (dt.Rows.Count > 0)
          {
            ipoint = int.Parse(dt.Rows[0]["iPoint"].ToString());
            gpoint = int.Parse(dt.Rows[0]["gPoint"].ToString());
          }
          returnVal = "{&#39;user&#39;:{&#39;id&#39;:&#39;" + info.UserId.ToString() + "&#39;,&#39;name&#39;:&#39;" + info.UserName + "&#39;,&#39;message&#39;:&#39;" + rp.getUserMsg(userName) + "&#39;,&#39;ipoint&#39;:&#39;" + ipoint.ToString() + "&#39;,&#39;gpoint&#39;:&#39;" + gpoint.ToString() + "&#39;}}";
        }
        else
        {
          int ids = 0;//状态：-2用户被锁定 -1用户名密码错误
          switch (state)
          {
            case EnumLoginState.Err_Locked:
              ids = -2;
              break;
            case EnumLoginState.Err_UserNameOrPwdError:
              ids = -1;
              break;
            default:
              break;
          }
          returnVal = "{&#39;user&#39;:{&#39;id&#39;:&#39;" + ids + "&#39;,&#39;name&#39;:&#39;&#39;,&#39;message&#39;:&#39;0&#39;,&#39;ipoint&#39;:&#39;0&#39;,&#39;gpoint&#39;:&#39;0&#39;}}";
        }
      }
      catch
      {
        returnVal = "{&#39;user&#39;:{&#39;id&#39;:&#39;0&#39;,&#39;name&#39;:&#39;&#39;,&#39;message&#39;:&#39;0&#39;,&#39;ipoint&#39;:&#39;0&#39;,&#39;gpoint&#39;:&#39;0&#39;}}";
      }
      return returnVal;
    }
    [WebMethod]
    public string UserLogout()
    {
      if (HttpContext.Current.Request.Cookies["DHFonMenberInfo"] != null)
      {
        HttpCookie cookie = new HttpCookie("DHFonMenberInfo");
        cookie.Expires = System.DateTime.Now.AddDays(-1);
        cookie.Domain = DFHon.Config.BaseConfig.getV("weblogin");
        HttpContext.Current.Response.AppendCookie(cookie);
      }
      return "1";
    }
    DFHon.Content.user UserBll = new DFHon.Content.user();
    [WebMethod]
    public string ValidateUserEmail(string email)
    {
      string result = "0";//返回的结果 -2邮箱为空 -1邮箱格式不正确 0邮箱存在 1填写正确
      if (string.IsNullOrEmpty(email))
      {
        result = "-2";//邮箱为空
      }
      else if (!IsValidEmail(email))
      {
        result = "-1";//邮箱格式不正确
      }
      else if (UserBll.sel_useremail(email) > 0)
      {
        result = "0";//邮箱存在
      }
      else
      {
        result = "1";//可以注册
      }
      return result;
    }

    [WebMethod]
    public string ValidateUserName(string username)
    {
      string result = "0";//返回值：-1用户名长度为2-16;0用户名存在;1可以注册
      if (username == "" || username == null || username.Length < 2 || username.Length > 16)
      {
        result = "-1";
      }
      else if (UserBll.sel_username(username) != 0)
      {
        result = "0";
      }
      else
      {
        result = "1";
      }
      return result;
    }

    public bool IsValidEmail(string strIn)
    { // Return true if strIn is in valid e-mail format. 
      return System.Text.RegularExpressions.Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
    }
  }

WebService

##

<script>
    $(function() {
      $("#userloging").show();
      //登录框处理开始
      //加载登录状态
      $.ajax({
        type: "POST", //访问WebService使用Post方式请求
        contentType: "application/json;charset=utf-8", //WebService 会返回Json类型
        url: "/API/Service/UserValidate.asmx/ValidateUserLogState", //调用WebService
        data: "{}", //Email参数
        dataType: &#39;json&#39;,
        beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },
        error: function(x, e) { },
        success: function(response) { //回调函数，result，返回值
          $("#userloging").hide();
          var json = eval(&#39;(&#39; + response.d + &#39;)&#39;);
          var userid = json.user.id;
          if (userid > 0) {
            $("#spanusername").html(json.user.name);
            $("#spanmessagenum").html(json.user.message);
            $("#userloginsucced").show();
            $("#userloginbox").hide();
          }
        }
      });
      //登录
      $("#userlogbutton").click(function() {
        
        var username = $("#username").val();
        var userpwd = $("#userpassword").val();
        if (username != "" && userpwd != "") {
          $("#userloging").show();
          $.ajax({
            type: "POST", //访问WebService使用Post方式请求
            contentType: "application/json;charset=utf-8", //WebService 会返回Json类型
            url: "/API/Service/UserValidate.asmx/UserLogin", //调用WebService
            data: "{userName:&#39;" + username + "&#39;,userPwd:&#39;" + userpwd + "&#39;}", //Email参数
            dataType: &#39;json&#39;,
            beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },
            error: function(x, e) {
            },
            success: function(result) { //回调函数，result，返回值
              $("#userloging").hide();
              var json = eval(&#39;(&#39; + result.d + &#39;)&#39;);
              var userid = json.user.id;
              if (userid > 0) {
                $("#spanusername").html(json.user.name);
                $("#spanmessagenum").html(json.user.message);
                $("#userloginsucced").show();
                $("#userloginbox").hide();
              }
              else {
                switch (userid) {
                  case -2:
                    alert("用户被锁定！请30分钟后再登录！");
                    $("#username").focus();
                    break;
                  case -1:
                    alert("用户名或密码错误！请核对您的用户名和密码！");
                    $("#userpassword").focus();
                    break;
                  default:
                    alert("登录失败！请核对您的用户名和密码之后重试！");
                    $("#userpassword").focus();
                    break;
                }
              }
            }
          });
        }
        else if (username == "") {
          alert("用户名不能为空！");
          $("#username").focus();
        }
        else if (userpwd == "") {
          alert("密码不能为空！");
          $("#userpassword").focus();
        }
      });
      //退出
      $("#logout").click(function() {
        $("#userloging").show();
        $.ajax({
          type: "POST", //访问WebService使用Post方式请求
          contentType: "application/json;utf-8", //WebService 会返回Json类型
          url: "/API/Service/UserValidate.asmx/UserLogout", //调用WebService
          data: "{}", //Email参数
          dataType: &#39;json&#39;,
          beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },
          success: function(result) { //回调函数，result，返回值
            $("#userloging").hide();
            if (result.d > 0) {
              $("#userloginsucced").hide();
              $("#userloginbox").show();
            }
          }
        });

      }); //登录框处理结束

    });
    </script>

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