AngularJS:获取所选项目

我有一个 ng-repeat 以行显示用户，当用户被点击时，它会打开模态弹出窗口以编辑包含所有用户详细信息的用户.当我为用户选择另一个角色并尝试获取新选择的行以传递给 http put 时，它不会给出新选择的项目文本，而是返回旧文本

I have an ng-repeat that display users in rows, when a user is clicked, it open modal popup for edit User containing all user details. When I select another role for the user and tries to get the newly selected row so as to pass to http put, it does not give the newly selected item text instead it still return the old text

//以表格行显示用户，点击用户名进行编辑

//display users in table rows, click on username to edit

    <tr ng-repeat="item in usersData | filter: searchBox">

        <td><a ng-click="openEditUser($index)">{{item.UserName}}</a></td>
        <td>{{item.EMail}}</td>
        <td>{{item.RoleName}}</td>
        <td style="text-align: right;">{{item.IsActive ? 'Yes' : 'No'}}</td>

 </tr>

当模态弹出窗口打开时，我从 API 获取所有角色并将其添加到 字段

When the modal popup opens, I get all the roles from API and add it to <select> field

//获取所有角色并添加到选择字段

//get all roles and add to select field

$http.get('mydomain.com/api/Users/GetAllRole').then(function (response) {
            $rootScope.myData = {};
            $rootScope.myData = response.data;
        });

//这里 ng-model="selectedItem.RoleId"

// Here ng-model="selectedItem.RoleId"

<select ng-required="true" ng-model="selectedItem.RoleId" class="form-control"
                ng-options="item._id as item.RoleName for item in myData">
            <option value="">Select</option>                                


</select>

在这里，当我在 <select> 字段中为用户选择另一个角色并尝试获取 $scope.selectedItem.RoleId 时，它会提供新选择的 RoleId 但当我尝试获取 $scope 时<select> 字段中的 .selectedItem.RoleName 它不会给出新的选定项目，而是返回旧的选定项目

Here when I choose another role for the user in the <select> field and try to get $scope.selectedItem.RoleId it gives the new selected RoleId but when I try to get $scope.selectedItem.RoleName from the <select> field it doesn't give the new selected item instead it still returns the old selected item

$scope.EditUser = function(){

    $http.put("domain.com/api/Users/UpdateUser", {
       _id: $scope.selectedItem._id,'RoleId': $scope.selectedItem.RoleId, 'EMail': $scope.selectedItem.EMail, RoleName : $scope.selectedItem.RoleName, IsActive: $scope.selectedItem.IsActive

    }).then(function (response) {
        $route.reload();
        $scope.ok();
        $scope.simpleSuccess();
    }, function (error) {
        $scope.ok();
        $scope.simpleError();
    });


  };