Set Html.TextBox value to null

Question

I have the following textbox on an MVC view:

@Html.TextBoxFor(x => x.Captcha, new { @value = "" })

I am trying the textbox to always be empty when the form show after being submited with errors ... But this is not working. I always see the last value.

And this is my controller:

[Route("signup"), HttpGet]
public virtual ActionResult SignUp() {

  UserSignUpModel model = new UserSignUpModel();
  model.Captcha = String.Empty;
  model.Email = "";
  return View(model);

} // SignUp

[Route("signup"), HttpPost, ValidateAntiForgeryToken]
public virtual ActionResult SignUp(UserSignUpModel model) {

  if (ModelState.IsValid) {

    // Create account code
    return View(MVC.Shared.Views._Note, new NoteModel("Account created"));

  } else {

    model.Captcha = String.Empty;
    model.Email = "";

    return View(Views.SignUp, model);

  }

}

Thank You, Miguel

Could you paste your UserSignUpModel as well?

solidau
– solidau

2013-12-11 22:20:43 +00:00
Commented Dec 11, 2013 at 22:20 — solidau
– solidau, Commented Dec 11, 2013 at 22:20

Christopher.Cubells · Accepted Answer · 2013-12-11 21:49:52Z

1

If your form is submitted with errors, you can simply clear the ViewData and explicitly clear your property in the controller before returning the view with errors.

[HttpPost]
public ActionResult MyController(Model myModel)
{
    if (!ModelState.IsValid)
    {
        myModel.Captcha = String.Empty;

        ViewData = null;

        return View(myModel);
    }

    return View(myModel);
}

answered Dec 11, 2013 at 21:49

Christopher.Cubells

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2 Comments

Roman Pushkin Over a year ago

yep! it's because of ViewData! Asp.Net hides so much from developer, so sometimes it's really confusing

Miguel Moura Over a year ago

Can't do what your suggest ... When I used ViewData = null I was able to make Captcha = "" but the data I had on the ViewBag was deleted. Any other option?

Miguel Moura · Accepted Answer · 2013-12-11 22:25:52Z

1

I was able to solve this. The correct way is to use the model state:

ModelState["Captcha"].Value = new ValueProviderResult("", "", Thread.CurrentThread.CurrentCulture);

This way there is no need to clear other data in ViewData.

And by changing the ModelState, and not removing it, it becomes possible to still display the error associated with that property.

answered Dec 11, 2013 at 22:25

Miguel Moura

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Comments

Roman Pushkin · Accepted Answer · 2013-12-11 21:38:58Z

0

In your action method in your controller set this parameter manually:

// ...
model.Captcha = String.Empty;
return View(model);

And I recommend to add autocomplete=off html attribute to your captcha field:

@Html.TextBoxFor(x => x.Captcha, new { autocomplete = "off" })

answered Dec 11, 2013 at 21:38

Roman Pushkin

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3 Comments

Miguel Moura Over a year ago

I added your two suggestions and not luck ... It is very strange that when I use model.Captcha = String.Empty; it still appears ... Any idea?

Miguel Moura Over a year ago

I just updated my post with the controller code ... I also tried to set the Email to "" and had the same result.

Miguel Moura Over a year ago

With HttpContext.Request.Params["Captcha"] = "" I get: An exception of type 'System.NotSupportedException' occurred in System.dll but was not handled in user code Additional information: Collection is read-only.

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