Question

My question isn’t so much about displaying the data its about collecting changes to the data.

My specific scenario is the need to allow users to delete multiple items from a list. I don’t know if i’m even approaching this in a locgical way.

The List is a collection of Private Messages. My view model has strings for To, From, Subject, and a bool for “Delete”.

public class PrivateMessagesModel {

    public PrivateMessagesModel()
    {
        PrivateMessages = new List<PrivateMessageReceivedModel>();
    }

    public List<PrivateMessageReceivedModel> PrivateMessages;
}

public class PrivateMessageReceivedModel
{

    [DataType(DataType.Text)]
    [Display(Name = "From")]
    public string From { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "Subject")]
    public string Subject { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "Message")]
    public string Message { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "Date")]
    public DateTime DateTimeSent { get; set; }

    [DataType(DataType.Text)]
    [Display(Name = "Delete")]
    public bool Delete { get; set; }

}

The code to display looks like this. And works ok.

@

model ScaleRailsOnline.Models.PrivateMessagesModel 
@{
    ViewBag.Title = "Private Messages";
}
<div id="content">
    <div class="content">
        <h2>
            Private Messages</h2>
        @using (Html.BeginForm())
        { <table>
            @for (int i = 0; i < Model.PrivateMessages.Count; i++)
            {
                <tr>
                    <td>
                        @Html.CheckBoxFor(m => m.PrivateMessages[i].Delete)
                    </td>
                    <td>
                        @Html.DisplayTextFor(m => m.PrivateMessages[i].From)
                    </td>
                </tr>
            }
        </table>
            <p>
                <input type="submit" value="Delete" />
            </p>
        }
    </div>
</div>

The problem is when I check a couple of the check boxes and hit the delete button, i get nothing back in the model.

Again, im sure i’m not approaching this in the right way. Any help would be appreciated.

Answer 1

You need to have a controller associated to the Html.BeginForm where the form will be posted.
eg

 <div id="formid">
    @using (Html.BeginForm("Index1", "Home", new AjaxOptions { UpdateTargetId = "formid",OnSuccess ="OnSuccess" }, new { id = "TheForm" }))
    {  
      @for (int i = 0; i < Model.PrivateMessages.Count; i++)
      {
          @Html.CheckBoxFor(m => m.PrivateMessages[i].Delete)
      }
      <input type="submit" name="name" value="Submit" />
    }
  </div>

On Controller

public ActionResult Index1(List<PrivateMessageReceivedModel> mod)
 {
   //Now in the mod you will get the value of the delete checkbox.
 }