Question

I’m currently learning ASP.NET MVC and using Nhibernate.

I would like to use Cascading Drop-Down Boxes. Has anyone managed to get cascading drop-down boxes working in MVC?

Updated: I have looked at the following website: link text and used method 1.

Controller Code

        var makeList = new SelectList(makeRepository.ListMakes (), 'Id', 'make',1);         ViewData['Makes'] = makeList;          //// Create Models view data         var modelList = new CascadingSelectList(modelRepository.ListModels (Convert.ToInt32(makeList.SelectedValue.ToString())), 'ModelID','Id', 'Name');         ViewData['Models'] = modelList; 

View Code

<%= Html.DropDownList('--Select Make--','Makes')%> <label for='Makes'>Car Model:</label>     <%= Html.CascadingDropDownList('Models', 'Makes') %>  

The correct list of cars is listed when a Make with id of 1 is selected, but when I select a different make the model list is empty?

Answer 1

You may want to read this TIP.

In this tip, Stephen Walter demonstrates three methods of creating cascading dropdown lists. First, he shows you how to alter the list of options displayed by one dropdown list when an option in another dropdown list changes. Second, he shows you how to expose the data for the dropdown lists through a controller action. Next, he shows you how to grab the data for the dropdown lists from web services.