Cascading dropdowns

You can add drop-down menus to almost any Bootstrap component using the dropdown plugin. A cascading drop-down menu is a drop-down menu that updates its data based on a value selected in another drop-down menu. To add cascading drop-down menus, perform the following steps:

1. Inside Visual Studio, add a new controller called DropdownController.cs to your Controllers folder.

2. In the Index action, add the following code, which will create a list of managers and load a list of reporting employees for the selected manager:

           public IActionResult Index(int id = 2) 
           { 
               var managers = new List<EmployeeModel>(); 
               var vicePresident = new EmployeeModel { Id = 2, Name = "Andrew 
               Fuller", JobTitle = "Vice President, Sales", ReportsTo = null }; 
               var salesManager = new EmployeeModel { Id = 5, Name = 
               "Steven Buchanan", JobTitle = "Sales Manager", ReportsTo = null }; 
          ...