Based on selected value from HTML.Dropdownlist, the values to be fetched


 I'm using Html.DropDownList.  When selection within this box changes, I need to retrieve the values from table based on the selected id(datavaluefield) of dropdownlist.

Here my code


ViewPost.cs viewpage

<%=Html.DropDownList("CategoryID",ViewData["CategoryID"])%>  ---- based on selected value from the user the below table should fetch the value the db

            <% foreach (VMLBlogsite.Models.Tbl_PostExperience post in (IEnumerable<Tbl_PostExperience>)ViewData.Model)
                <td> Title </td>
                    <%=post.Title %>
                    <%=post.Ctg_Id %>
                <%= Html.ActionLink("PostComment", "PostComment", new { id = post.PostId })%>
                <td> Description</td>
                <td colspan=2>
                    <%=post.Description %>
            <% }%>


   public ActionResult ViewPost()


 public ActionResult New()

           var categories = from c in db.Tbl_BlogCategories select c;
            ViewData["CategoryID"] = new SelectList(categories, "Ctg_Id", "Ctg_Name");
            return View();

10/23/2008 1:01:52 PM 4300 articles. 0 followers. Follow

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You can solve this in two ways - you can re-render whole page or some part of page only (using AJAX). In both solutions you must use onchange event of select HTML element to handle when user changes selection.

Don't forget to click "Mark as Answer" on the post that helped you.
10/24/2008 1:02:23 PM

 Well, I am completely new in ASP.NET MVC, so... probably it's not a goooood solution. But, it works and can give you insights on better way to do it. I don't know it it is exactly what you need, but it lists the products of a category specified on a dropdownlist.


	// ====================
// Controller Code
// ====================

public ActionResult ListByCategory()
IEnumerable<categories> = this.CategoryRepository.All();

ViewData["Categories"] = categories;
if (categories.ToList().Count > 0)
ViewData["CategoryID"] = categories.First().ID; // To hold the value on the dropdownlist
products = this.ProductRepository.FindAll(x => x.CategoryID == (int)ViewData["CategoryID"]);
ViewData["CategoryID"] = 0;
produtos = this.ProductRepository.All();

return View(products.ToList());

public ActionResult ListByCategory([Bind(Include="CategoryID", Prefix="Product")] Product p)
ViewData["Categories"] = this.CategoryRepository.All();
ViewData["CategoryID"] = p.CategoryID;
var products = this.ProductRepository.FindAll(x => x.CategoryID == p.CategoryID);
return View(products.ToList());

  // ====================
  // View Code
  // ====================

    <%  using (Html.BeginForm())
       { %>
            <%= Html.DropDownList(null,"Product.CategoryID",
                                   new SelectList((IEnumerable<Category>)ViewData["Categories"], "ID", "Description", (int)ViewData["CategoryID"]),
                                   new { onchange = "document.forms[0].submit()" }
                                  ) %>
    <%  } %>
    <% foreach (var product in ViewData.Model)
       {  %>
                <h3><%= product.Title %></h3>
                <p><%= produto.Description %></p>
                <p><%= produto.Price %></p>
    <% } %>
10/24/2008 8:02:21 PM

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