jQuery ajax调用webservice注意事项

jquery ajax调用webservice(c#)要注意的几个事项：

1、web.config里需要配置2个地方

<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>

在<system.web></system.web>之间加入

<webservices>
   <protocols>
    <add name="httppost" />
    <add name="httpget" />
   </protocols>
  </webservices>

2.正确地编写webserivce的代码

/// <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 = "{'user':{'id':'" + cookie["userid"] + "','name':'" + username + "','message':'" + rp.getusermsg(dfhon.global.currentcookie.username) + "','ipoint':'" + ipoint.tostring() + "','gpoint':'" + gpoint.tostring() + "'}}";
      }
      else
      {
        result = "{'user':{'id':'0','name':'','message':'0','ipoint':'0','gpoint':'0'}}";
      }
      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 = "{'user':{'id':'" + info.userid.tostring() + "','name':'" + info.username + "','message':'" + rp.getusermsg(username) + "','ipoint':'" + ipoint.tostring() + "','gpoint':'" + gpoint.tostring() + "'}}";
        }
        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 = "{'user':{'id':'" + ids + "','name':'','message':'0','ipoint':'0','gpoint':'0'}}";
        }
      }
      catch
      {
        returnval = "{'user':{'id':'0','name':'','message':'0','ipoint':'0','gpoint':'0'}}";
      }
      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: 'json',
        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('(' + response.d + ')');
          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:'" + username + "',userpwd:'" + userpwd + "'}", //email参数
            datatype: 'json',
            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('(' + result.d + ')');
              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: 'json',
          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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