angularjs – ng-change事件未在循环内触发

function friendControllerTest($scope,$http) {
    $scope.loading = true;
    $scope.addMode = false;
    $scope.countryList = [];
    $scope.stateList = [];

    function getAllCountry() {
        $http({
            method: 'Get',url: '/Home/GetCountry'
        }).success(function (data) {
            $scope.countryList = data;
        }).error(function () {
            $scope.errorMessage = 'Not found';
        });
    }

    function getStatebyCountryId(Id) {
        $scope.stateList = null;
        if (Id) {           // Check here country Id is null or not
            $http({
                method: 'POST',url: '/Home/GetStateByCountryId/',data: JSON.stringify({ CountryId:Id })
            }).success(function (data) {
                $scope.stateList = data;
            }).error(function (data) {
                alert(data.message);
                $scope.message = 'not found';
            });
        }
        else {
            $scope.stateList = null;
        }
    }


    $scope.GetStatesList = function (id) {
        if (id) {           // Check here country Id is null or not
            $http({
                method: 'POST',data: JSON.stringify({ CountryId: id })
            }).success(function (data) {
                $scope.stateList = data;
            }).error(function (data) {
                alert(data.message);
                $scope.message = 'not found';
            });
        }
        else {
            $scope.stateList = null;
        }
    }



    $scope.myMethod = function () {
        var text = $scope.newfriend.SearchText;
        $http.get('../Home/GetFriendsList',{ params: { 'text': text } }).success(function (data) {
            $scope.friends = data;
        })
          .error(function () {
              $scope.error = "An Error has occured while loading posts!";
          });
    }


    $http.get('../Home/GetFriendsList').success(function (data) {
        alert("list called")
        $scope.friends = data;
        $scope.loading = false;
    })
   .error(function () {
       $scope.error = "An Error has occured while loading posts!";
       $scope.loading = false;
   });

    $scope.toggleAdd = function () {
        $scope.addMode = !$scope.addMode;
        if ($scope.addMode) {
            getAllCountry();
        }
    };

    $scope.toggleEdit = function () { 
        this.friend.editMode = !this.friend.editMode;
        getAllCountry();
        if (this.friend.Country.Id > 0)
            getStatebyCountryId(this.friend.Country.Id);
    };

    $scope.add = function () {
        $scope.loading = true;
        var newfriend = {
            firstname: $scope.newfriend.firstname,lastname: $scope.newfriend.lastName,address: $scope.newfriend.address,postalcode: $scope.newfriend.PostalCode,notes: $scope.newfriend.Notes,CountryId: $scope.newfriend.Country.Id,StateId: $scope.newfriend.State.Id
        }
        $http.post('../Home/AddFriends',newfriend).success(function (data) {
            alert("Added Successfully!!");
            $scope.addMode = false;
            $scope.friends.push(data);
            $scope.loading = false;
            $scope.newfriend = "";
        }).error(function (data) {
            $scope.error = "An Error has occured while Adding Friend! " + data;
            $scope.loading = false;
        });
    };

    $scope.save = function () {
        $scope.loading = true;
        var frien = this.friend;
        $http.put('../Home/EditFriend',frien).success(function (data) {
            alert("Saved Successfully!!");
            frien.editMode = false;
            $scope.loading = false;
        }).error(function (data) {
            $scope.error = "An Error has occured while Saving Friend! " + data;
            $scope.loading = false;
        });
    };

    $scope.deletefriend = function () {
        $scope.loading = true;
        var friendid = this.friend.Id;
        $http.delete('../Home/RemoveFriend/' + friendid).success(function (data) {
            alert("Deleted Successfully!!");
            $.each($scope.friends,function (i) {
                if ($scope.friends[i].Id === friendid) {
                    $scope.friends.splice(i,1);
                    return false;
                }
            });
            $scope.loading = false;
        }).error(function (data) {
            $scope.error = "An Error has occured while Saving Friend! " + data;
            $scope.loading = false;
        });
    };
}

<html data-ng-app="" data-ng-controller="friendControllerTest">
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    @Styles.Render("~/Content/css")
    @Scripts.Render("~/bundles/modernizr")
  </head>
  
  <body>
    <div class="container">
        <strong class="error">{{ error }}</strong>
        <div id="mydiv" data-ng-show="loading">
            <img src="Images/ajax-loader1.gif" class="ajax-loader" />
        </div>
       
        <p data-ng-hide="addMode">
            <a data-ng-click="toggleAdd()" href="javascript:;" class="btn btn-primary">Add New
            </a>
        </p>
        <form name="addFriend" data-ng-show="addMode" style="width: 600px; margin: 0px auto;">
            <label>FirstName:</label><input type="text" data-ng-model="newfriend.firstname" required />
            <label>LastName:</label><input type="text" data-ng-model="newfriend.lastName" required />
            <label>Address:</label><input type="text" data-ng-model="newfriend.address" required />
            <label>Country:</label>
           
            <select ng-model="newfriend.Country" ng-options="c.Name for c in countryList track by c.Id" ng-change="GetStatesList(newfriend.Country.Id)">
                <option value="">Select Country</option>
            </select>
            <label>State:</label>

            <select ng-model="newfriend.State" ng-options="s.Name for s in stateList track by s.Id">
                <option value="">Select State</option>
            </select>
            <label>PostalCode:</label><input type="text" data-ng-model="newfriend.PostalCode" required />
            <label>Notes:</label><input type="text" data-ng-model="newfriend.Notes" required />
            <br />
            <br />
            <input type="submit" value="Add" data-ng-click="add()" data-ng-disabled="!addFriend.$valid" class="btn btn-primary" />
            <input type="button" value="Cancel" data-ng-click="toggleAdd()" class="btn btn-primary" />
            <br />
            <br />
        </form>
        <table class="table table-bordered table-hover" style="width: 800px">
            <tr>
                <th>#</th>
                <td>FirstName</td>
                <th>LastName</th>
                <th>Address</th>
                <th>Country</th>
                <th>State</th>
                <th>PostalCode</th>
                <th>Notes</th>
            </tr>

            <tr data-ng-repeat="friend in friends">
                <td><strong>{{ friend.Id }}</strong></td>
                <td>
                    <p data-ng-hide="friend.editMode">{{ friend.firstname}}</p>
                    <input data-ng-show="friend.editMode" type="text" data-ng-model="friend.firstname" />
                </td>
                <td>
                    <p data-ng-hide="friend.editMode">{{ friend.lastname }}</p>
                    <input data-ng-show="friend.editMode" type="text" data-ng-model="friend.lastname" />
                </td>
                <td>
                    <p data-ng-hide="friend.editMode">{{ friend.address }}</p>
                    <input data-ng-show="friend.editMode" type="text" data-ng-model="friend.address" />
                </td>
                <td>
                    <p data-ng-hide="friend.editMode">{{ friend.Country.Name }}</p>
                    <select data-ng-show="friend.editMode" ng-model="friend.Country" ng-options="c.Name for c in countryList track by c.Id" ng-change="$parent.GetStatesList(friend.Country.Id)">
                        <option value="">Select Country</option>
                    </select>
                </td>
                <td>
                    <p data-ng-hide="friend.editMode">{{friend.State.Name }}</p>
                    <select data-ng-show="friend.editMode" ng-model="friend.State" ng-options="s.Name for s in stateList track by s.Id">
                        <option value="">Select State</option>
                    </select>
                </td>


                <td>
                    <p data-ng-hide="friend.editMode">{{ friend.postalcode }}</p>
                    <input data-ng-show="friend.editMode" type="text" data-ng-model="friend.postalcode" />
                </td>

                <td>
                    <p data-ng-hide="friend.editMode">{{ friend.notes }}</p>
                    <input data-ng-show="friend.editMode" type="text" data-ng-model="friend.notes" />
                </td>
                <td>
                    <p data-ng-hide="friend.editMode"><a data-ng-click="toggleEdit(friend)" href="javascript:;">Edit</a> | <a data-ng-click="deletefriend(friend)" href="javascript:;">Delete</a></p>
                    <p data-ng-show="friend.editMode"><a data-ng-click="save(friend)" href="javascript:;">Save</a> | <a data-ng-click="toggleEdit(friend)" href="javascript:;">Cancel</a></p>
                </td>
            </tr>
        </table>
        <hr />
    </div>
    @Scripts.Render("~/bundles/jquery")
    @Scripts.Render("~/bundles/bootstrap")
    @Scripts.Render("~/bundles/angularjs")
    <script src="~/Scripts/MyScript.js"></script>
</body>

我试图在编辑模式下打开我的国家和州下拉列表,到目前为止我成功了.

但唯一的问题是,当我点击任何记录以编辑模式打开时,我的国家和州下拉列表都正确绑定但是当我从国家/地区下拉列表中选择其他国家/地区时,我的ng-change未触发,我不知道为什么.

这是我添加新记录的观点：

<select ng-model="newfriend.Country" ng-options="c.Name for c in countryList track by c.Id" ng-change="GetStatesList()">
                <option value="">Select Country</option>
            </select>

            <label>State:</label>
            <select ng-model="newfriend.State" ng-options="s.Name for s in stateList track by s.Id">
                <option value="">Select State</option>
            </select>

我的控制器：

function friendControllerTest($scope,$http) {
             $scope.GetStatesList = function () {
                  //server side call to fetch state by country id
            }
 $scope.toggleEdit = function () { 
            this.friend.editMode = !this.friend.editMode;
            getAllCountry();
            if (this.friend.Country.Id > 0)
                getStatebyCountryId(this.friend.Country.Id);
        };


      };

我的显示记录视图：

<table class="table table-bordered table-hover" style="width: 800px">
 <tr data-ng-repeat="friend in friends">
  <td>
                    <p data-ng-hide="friend.editMode">{{ friend.Country.Name }}</p>
                    <select data-ng-show="friend.editMode" ng-model="friend.Country" ng-options="c.Name for c in countryList track by c.Id" ng-change="GetStatesList()">
                        <option value="">Select Country</option>
                    </select>
                </td>
                <td>
                    <p data-ng-hide="friend.editMode">{{friend.State.Name }}</p>
                    <select data-ng-show="friend.editMode" ng-model="friend.State" ng-options="s.Name for s in stateList track by s.Id">
                        <option value="">Select State</option>
                    </select>
                </td>

</tr>
<table>



public class HomeController : Controller
    {
        //
        // GET: /Home/
        private FriendsEntities db = new FriendsEntities();
        public ActionResult Index()
        {
            return View();
        }

        public ActionResult GetFriendsList(string text)
        {

            var data = db.Friends.Select
                                (
                                    d => new FriendModel
                                    {
                                        Id=d.Id,firstname = d.firstname,lastname = d.lastname,address = d.address,notes = d.notes,postalcode = d.postalcode,Country = d.Country.Friends.Select
                                                                   (
                                                                        x => new CountryModel
                                                                        {
                                                                            Id=x.Country.Id,Name = x.Country.Name
                                                                        }
                                                                   ).FirstOrDefault(),State = d.State.Friends.Select
                                                               (
                                                                    s => new StateModel
                                                                    {
                                                                        Id=s.State.Id,Name = s.State.Name
                                                                    }
                                                               ).FirstOrDefault()

                                    }
                                ).ToList();
           return Json(data,JsonRequestBehavior.AllowGet);
        }

        [HttpPost]
        public ActionResult AddFriends(Friends FriendsModel)
        {
            var result = db.Friends.Add(FriendsModel);
            db.SaveChanges();
            var data = db.Friends.Where(t => t.Id == result.Id).Select
                                     (
                                            d => new FriendModel
                                            {
                                                Id=d.Id,Name = x.Country.Name
                                                                        }

                                                                   ).FirstOrDefault(),State = d.State.Friends.Select
                                                                       (
                                                                           b => new StateModel
                                                                           {
                                                                               Id=b.State.Id,Name = b.State.Name
                                                                           }
                                                                       ).FirstOrDefault()
                                            }

                                     ).SingleOrDefault();

            return Json(data);
        }


        public ActionResult RemoveFriend(int id)
        {
            Friends friend = db.Friends.Find(id);
              db.Friends.Remove(friend);
              db.SaveChanges();
              return Json(friend);
        }

        public JsonResult GetCountryState()
        {
            List<CountryModel> Country = new List<CountryModel>().ToList();
            Country.Add(new CountryModel() { Id = 0,Name = "Select Country" });
            var Data = db.Country.Select
                                (
                                    d => new CountryModel
                                    {
                                        Id = d.Id,Name = d.Name,State = d.State.Select
                                        (
                                             x => new StateModel
                                             {
                                                 Id = x.Id,Name = x.Name
                                             }
                                        ).ToList()
                                    }
                                ).ToList();
            Country.AddRange(Data);
            return Json(Country,JsonRequestBehavior.AllowGet);
        }

        public JsonResult GetCountry()
        {
            var Data = db.Country.Select
                                (
                                    d => new CountryModel
                                    {
                                        Id = d.Id,}
                                ).ToList();
            return Json(Data,JsonRequestBehavior.AllowGet);
        }

        public JsonResult GetStateByCountryId(int CountryId)
        {
                var getStateList = db.State.Where(p => p.CountryId == CountryId).Select(x => new { x.Id,x.Name }).ToList();
                return Json(getStateList,JsonRequestBehavior.AllowGet);
        }




        [HttpPut]
        public ActionResult EditFriend(Friends  FriendModel)
        {
            Friends friend = db.Friends.Find(FriendModel.Id);
            friend.firstname = FriendModel.firstname;
            friend.lastname = FriendModel.lastname;
            friend.postalcode = FriendModel.postalcode;
            friend.notes = FriendModel.notes;
            friend.address = FriendModel.address;
            friend.CountryId = FriendModel.Country.Id;
            friend.StateId = FriendModel.State.Id;
            db.SaveChanges();

            var friendModel = new FriendModel();
            friendModel.Id = friend.Id;
            friendModel.firstname = friend.firstname;
            friendModel.lastname = friend.lastname;
            friendModel.postalcode = friend.postalcode;
            friendModel.notes = friend.notes;
            friendModel.address = friend.address;
            friendModel.CountryId = friend.CountryId;
            friendModel.StateId = friend.StateId;
            return Json(friendModel);
        }
    }



public class BundleConfig
    {
        public static void RegisterBundles(BundleCollection bundles)
        {
            bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
                        "~/Scripts/jquery-{version}.js"));

            bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(
                        "~/Scripts/jquery.validate*"));

            // Use the development version of Modernizr to develop with and learn from. Then,when you're
            // ready for production,use the build tool at http://modernizr.com to pick only the tests you need.
            bundles.Add(new ScriptBundle("~/bundles/modernizr").Include(
                        "~/Scripts/modernizr-*"));

            bundles.Add(new ScriptBundle("~/bundles/bootstrap").Include(
                      "~/Scripts/bootstrap.js","~/Scripts/respond.js"));

            bundles.Add(new StyleBundle("~/Content/css").Include(
                      "~/Content/bootstrap.css","~/Content/site.css"));


            bundles.Add(new ScriptBundle("~/bundles/angularjs").Include(
                      "~/Scripts/angular.min.js"));

            bundles.Add(new ScriptBundle("~/bundles/appjs").Include(
                     "~/Scripts/app/customerCtrl.js"));
        }
    }