javascript - 使用 java 脚本和 JQuery 来显示消息而不是抛出异常

Question

如何使用 Javascript 和 JQuery 显示消息(通知用户组是否成功添加)而不是抛出错误。实际上这段代码检查组名是否已经存在于数据库中。

Controller :

[HttpPost]

    public int CreateGroup(UserGroup group)
    { 

        return bc.Create(group, user.id);
    }

用户组类:

    UserGroupDalc Dalc = new UserGroupDalc();

    public int Create(UserGroup group, int creatorId)
    {

     if(ByName(group.name) != null) throw new ArgumentException(string.Format("Group name: {0} is already exist.", group.name));
     return Dalc.CreateGroup(group, creatorId);
    }

用户组dalc类:

public int CreateGroup(UserGroup group, int creatorId) {

            connection();
             com = new SqlCommand("spp_adm_user_group_ins", conn);
            com.CommandType = CommandType.StoredProcedure;
            com.Parameters.AddWithValue("@name", group.name);
            com.Parameters.AddWithValue("@userid", group.creator_id);
            conn.Open();
           int i = com.ExecuteNonQuery();
           if (i >= 1)
           {

               return 1;
           }
           else
           {
               return 0;
           }

发布数据的js:

            save: function () {
            var jForm = $("#form1");
            Metronic.blockUI();
            GroupAPI.create(jForm.serialize(),
                function (data) {
                    console.log(data);
                },
                function (error) {
                    console.log(error);
                },
                function () { Metronic.unblockUI(); });
        }
    }
}();

var GroupAPI = function () {
    var url_create = "api/usergroup/createGroup";
    var url_list = "api/usergroup/list";

    return {
        create: function (item, done, fail, always) {
            var jqxhr = $.post(url_create, item);
            jqXhrHandler(jqxhr, done, fail, always);
        }
    }
}();

Answer 1

更改用户组类

UserGroupDalc Dalc = new UserGroupDalc();

public int Create(UserGroup group, int creatorId)
{
 if(ByName(group.name) != null){
 return 1;
 }
 return Dalc.CreateGroup(group, creatorId);
}

js

save: function () {
        var jForm = $("#form1");
        Metronic.blockUI();
        GroupAPI.create(jForm.serialize(),
            function (data) {
                //console.log(data);
           if (data == 0)
            {
               alert('added');
            }else if(data == 1){
               alert('already exist');
            }
            },
            function (error) {
                console.log(error);
            },
            function () { Metronic.unblockUI(); });
    }
   }
 }();