MVC - Html.DropDownList - SelectList - UpdateModel RSS

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  ccook

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  MVC - Html.DropDownList - SelectList - UpdateModel

  Oct 05, 2008 01:49 AM|LINK

  Has anyone been able to use UpdateModel with DropDownLists?  Whenever I have a DropDownList I get the following error.  Is there a different approach for DropDownLists?

  The model of type 'Models.SubscribeForm' was not successfully updated. 

  Thank you,

  Charles

   

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  skaue

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Oct 21, 2008 07:58 AM|LINK

  Having the same problem, only for Internet Explorer.

  In my case it is a dropdown for a foreign key (nullable GUID), and its value is initiated with the value null which I assume is posted back and makes the UpdateModel method go haywire.... :-( 
  

  "There's no such thing as a silverbullet", The Werewolf anxiously answered the .Net developer.
  (http://en.wikipedia.org/wiki/Silver_bullet)
  
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  CarlUman

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 20, 2009 03:00 PM|LINK

  I'm having this issue with the 1.0 version.  If I show a edit form and don't change the selected item it works.  If I change the selected item I get this error as well.

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  bradwils

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 20, 2009 03:06 PM|LINK

  skaue

  Having the same problem, only for Internet Explorer.

  In my case it is a dropdown for a foreign key (nullable GUID), and its value is initiated with the value null which I assume is posted back and makes the UpdateModel method go haywire.... :-( 
  

  Is the GUID in the model nullable? GUID in .NET is a value type so it cannot accept NULL.

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  CarlUman

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 20, 2009 03:27 PM|LINK

  Not sure about skaue but the value in my linqtosql model is "SmallInt NOT NULL".  After the post to the controller   I checked the value of the column in the product model that should contain the value (ID) of the dropdown and I checked that to the database and it is showing the right ID that should get stored.  Below is the dropdown, the controller action and the html from the page.  Line 20 is where the error happens.  Like I said if I don't change the selected item I don't get an error.

  <%= Html.DropDownList("colQuarryID", new SelectList((List<Quarry.QuarryDropdown>)ViewData["quarries"], "colID", "colDisplay", Model.colProductID))%>

  // POST: /Product/Save
          [AcceptVerbs(HttpVerbs.Post)]
          public ActionResult Save(Product product)
          {
              product.AddModelErrors(ModelState, product.GetRuleViolations());
  
  
              if (!ModelState.IsValid)
              {
                  Load();
                  return product.colID == 0 ? View("Add", product) : View("Edit", product);
              }
  
  
              try
              {
                  if (product.colID == 0)
                      product.Add(product);
                  else
                  {
                      product = product.Get(product.colID);
                      UpdateModel(product);
                  }
  
  
                  product.Save();
              }
              catch (Exception err)
              {
                  ModelState.AddModelError("miscError1", "Unhandled error");
                  ModelState.AddModelError("miscError2", err.InnerException == null ? err.Message : err.InnerException.Message);
                  Load();
                  return product.colID == 0 ? View("Add", product) : View("Edit", product);
              }
  
  
              return RedirectToAction("List");
          }

   

  <select id="colQuarryID" name="colQuarryID">value="5">11 - Conklin
  	value="12">81 - Ernst
  	"selected" value="1">31 - Klein
  	value="14">121 - Marengo Ready Mix
  	value="15">125 - Martin Marietta
  	value="13">6990 - Parking Lot
  	value="3">43 - Riverside
  	value="4">41 - S & G MATERIALS
  	value="10">6995 - Stockpile Frytown
  	value="9">6992 - Stockpile Local Road
  	value="7">6991 - Stockpile Lone Tree
  	value="6">6999 - Stockpile Main Shop
  	value="8">6993 - Stockpile Solon
  	value="11">6994 - Stockpile Tiffin
  	value="2">64 - Wendling
  
   	
   

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  bradwils

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 20, 2009 03:47 PM|LINK

  CarlUman

  <%= Html.DropDownList("colQuarryID", new SelectList((List<Quarry.QuarryDropdown>)ViewData["quarries"], "colID", "colDisplay", Model.colProductID))%>

  The field in the Product class is called colProductID, but the HTML field name is colQuarryID, so the model binder won't be able to make the connection between the two. Try naming the HTML field colProductID instead.

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  CarlUman

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 20, 2009 03:56 PM|LINK

  My error... I copied that dropdown from the wrong edit page (although that is error on that page).  Here is what I have for that dropdown giving the error.  The field on the edit screen is marked with the ._____-validation-error css after a save is requested.

  <%= Html.DropDownList("colQuarryID", new SelectList((List<Quarry.QuarryDropdown>)ViewData["quarries"], "colID", "colDisplay", Model.colQuarryID))%>

   EDIT: Whatever I'm doing wrong it is consistent.  Every page I have with a dropdown does this.

  • Edited by CarlUman on Apr 20, 2009 04:17 PM
  • Edited by CarlUman on Apr 20, 2009 05:00 PM
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  CarlUman

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  32 Posts

  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 23, 2009 06:39 PM|LINK

  Is anyone getting the dropdown to work with model bind... I'm just wondering if this is a bug or not?  If this is working from someone are the the dropdown a forign key?

   Thanks

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  ypso

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  1 Post

  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Apr 29, 2009 06:47 AM|LINK

  <%= Html.DropDownList("state", (SelectList)ViewData["state_list"], "stare", Model.company.state)%>

   works
  

  • Edited by ypso on Apr 29, 2009 06:48 AM
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  altafkhatri@...

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  Re: MVC - Html.DropDownList - SelectList - UpdateModel

  Jul 22, 2009 12:11 AM|LINK

  Check out the post at the following blog:

  http://altafkhatri.com/Technical/How_to_bind_IList_with_MVC_Dropdownlist_box

  MVC dropdownlist categories

  Altaf Khatri