cascading dropdown angularjs mvc - asp.net

Question

i am getting null values
$scope.GetDepartment = function (Department) {
$http.get('/Official/GetDepartment?Department=' + Department).then(function (data) {
console.log(data);
$scope.department= data.data;
});
};
Html
<select ng-model="empModel.division" id="" name="Division" class="form-control"
ng-click = "GetDepartment(empModel.division)"
ng-change = "GetDepartment(empModel.division)"
ng-options="c.division as c.division for c in division" >
<option selected="selected">Select</option>
</select>
<select ng-model="empModel.department" id="" name="Department" class="form-control"
ng-options="d.department as d.department for d in department">
<option></option>
</select>
When i select divison i am not getting anything in department dropdown
Controller
public JsonResult GetDepartment(string Department)
{
var department = db.Depts.Where(x => x.Department == Department).
GroupBy(x => x.Department).
Select(x => x.FirstOrDefault()).
OrderBy(x => x.Department).ToList();
return Json(department);
}

Answer 1

Your angular part for retrieve division data
function GetDesignation(input) {
$http.get('/Official/GetDesignation?designation='+input).then(function (data) {
console.log(data);
$scope.designation = data.data;
});
};
change in HTML using ng-change directive there
<select ng-model="empModel.division" id="" name="Division" class="form-control" ng-change = "GetDesignation(empModel.division)"
ng-options="c.division as c.division for c in division" >
<option></option>
</select>
New HTML tag for load Designation data in dropdown
<select ng-model="empModel.designation" id="" name="Designation" class="form-control"
ng-options="c.designation as c.designation for c in designation" >
<option></option>
</select>