Question

我使用角度JS MVC这里数据绑定到dropdownlist但是当我尝试将值加载到数据库但该数据没有binfing时：

 <div class="form-group">
                        <div class="row">
                            <div class="col-md-2 col-sm-2" style="margin-left:20px">
                                <b>State</b>
                            </div>
                            <div class="col-md-8 col-sm-8">
                                  <select class="form-control" data-modal="modal" ng-options="I.CountryID as I.CountryName for I in CountryList" ng-model="CountryID" ng-change="StateList()" ng-required="true">
                                <option value="" disabled selected>--Select Country--</option>
                            </div>
                        </div>
                    </div>

角度代码

$scope.AddUpdateEmployee = function (Emp) {
        alert("Enter in update")
        var Employee = {
            Id: $scope.EmployeeId,
            Name: $scope.EmployeeName,
            Email: $scope.EmployeeEmail,
            Psw: $scope.Password,
            Country: $scope.CountryID,

        };

mvc代码

   public JsonResult AddEmployee( Employee emps)
        {
            if (emps != null)
            {
                Employee ee = new Employee();
                ee.Name = emps.Name;
                ee.Email = emps.Email;
                ee.Psw = emps.Psw;
                ee.Country = emps.Country;
                ee.State = emps.State;
                ee.City = emps.City;
            }

Answer 1

请查看下面的数据库绑定。

http://jsfiddle.net/81t6cbjw/261/

  <select class="form-control" data-modal="modal" 
           ng-options="I.CountryID as I.CountryName for I in CountryList" 
           ng-model="CountryID" ng-change="StateList()" ng-required="true">
       <option value="" disabled selected>--Select Country--</option>
  </select>

Answer 2

在select元素中添加ng-if，问题元素在数据到来之前呈现，ng-if在其上设置监视

<select ng-if="CountryList && CountryList.length" class="form-control" data-modal="modal" ng-options="I.CountryID as I.CountryName for I in CountryList" ng-model="CountryID" ng-change="StateList()" ng-required="true">
       <option value="" disabled selected>--Select Country--</option>
</select>

为什么dropdownlist值没有绑定到数据库中

2 个答案: