Cascading DropdownList in ASP.NET MVC

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C#

How to Bind Values To DropdownList in ASP.NET MVC?

Posted 18-Sep-12 20:49pm

Developer Hemu Patel

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4 solutions

Solution 5

check for clear solution of cascading dropdownlist in asp.net mvc:

http://blogs.msdn.com/b/rickandy/archive/2012/01/09/cascasding-dropdownlist-in-asp-net-mvc.aspx?CommentPosted=true#commentmessage[^]

Posted 10-Feb-14 7:32am

Rohit Kesharwani

Solution 3

Implementation of MVC3 Cascading Dropdown using jQuery[^]

Posted 16-May-13 19:27pm

Naufel Basheer

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Ur20 Mandaliya · Accepted Answer · 2012-09-18T22:13:00

In Action :

C#

public ActionResult Create()
    {
        var db = new DbDataContext();
        IEnumerable<SelectListItem> states = db.States.Select(p => new SelectListItem
        {
            Value = p.StateId.ToString(),
            Text = p.Name
        });
        ViewData["YourData"] = states;
        return View();
    }

In View :

C#

<div class="editor-field">
                <%: Html.DropDownListFor(model => model.StateId, (IEnumerable<SelectListItem>)ViewData["YourData"])%>
                <%: Html.ValidationMessageFor(model => model.StateId) %>
            </div>

**Zoltán Zörgő** · Accepted Answer · 2012-09-18T21:08:00

First of all, there is no such thing as data binding in ASP.NET MVC. You have to pass select values from the controller to the model either using a view model, or via ViewBag (or ViewData if you still use MVC2). Here is a good "howto": http://www.mikesdotnetting.com/Article/128/Get-The-Drop-On-ASP.NET-MVC-DropDownLists[^], but google can give you more.
And now with cascading.
There are several approaches, but these can be interesting:
1) If you know all your lists on the first render of your page, you can embed them in the view as JS arrays, and filter them on client side - this is not dynamic and can be a huge overhead.
2) Embed your "cascading" logic into the view: Simple Implementation of MVC Cascading Ajax Drop Down[^], but I don't recommend this, because it is not following the MVC concepts.
3) Using a Jquery, making an ajax callback to populate the second (and following) lists. I found a plugin, you might use: http://weblogs.asp.net/rajbk/archive/2010/05/20/cascadingdropdown-jquery-plugin-for-asp-net-mvc.aspx[^] - I reccomend this approach, since you can dinamically calculate what elements to put into the list, and you don't need to refresh the page.

Cascading DropdownList in ASP.NET MVC

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