Loss of ViewModel data after POST
I don't see this problem too often, but I have a .cshtml that uses layout. In the layout I have:
@using (Html.BeginForm(null, null, FormMethod.Post, new { @class = "someCssClass", @id = "UserForm" }))
{
...rest of the code
}
My main .cshtml using this layout has a model defined at the top, as we always do:
@model CarViewModel
@{
Layout = "~/Views/Shared/_CarLayout.cshtml";
}
When it goes back to my action method, I get zeros for all model values:
public ActionResult Cars(CarViewModel model)
{
carBL.RemoveCars(model.CarIds, model.DealerId);
...
}
Not sure what I need to do here and why this is happening. I usually just return it using autobind. It seems to me when the model is used with RAzor in the markup that comes back with the returned ViewModel, but if I don't use those fields it doesn't ... so I guess it works, and if I don't use them in the markup, do I need to send them back as hidden values to force persistence, since I am not using the x fields from the ViewModel (which would automatically save those fields if I used them in the form)?
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A quick test to check if the form was submitted correctly would be to change the signature of your action:
public ActionResult Cars(FormCollection form)
{
...
}
If form
not completed, you have a problem with the form post. As a side note, you can accomplish this when viewing the form post data with a tool like FireBug, Chrome Dev Tools, or Fiddler if you prefer.
If the form is submitting correctly, then I have to check that the name of the input fields on the form matches the names CarViewModel
you expect.
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Not sure if this has been resolved yet, but this is how I do it (partial code):
@model MyProject.ViewModels.MyViewModel
@using (Html.BeginForm())
{
<table>
<tr>
<td>First Name:</td>
<td>@Html.TextBoxFor(x => x.FirstName, new { maxlength = "50" })
@Html.ValidationMessageFor(x => x.FirstName)
</td>
</tr>
</table>
<button id="btnSave" type="submit">Save</button>
<button id="btnCancel" type="button">Cancel</button>
}
Then my action method to handle the HTTP post request:
[HttpPost]
public ActionResult Create(MyViewModel viewModel)
{
// Check for null on viewModel
// Do what needs to be done
}
Doing it this way should not allow you to lose your form / submission filled values.
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