Add Validation Message To View

Question

Lets say I have a form with no model binding or data annotations. When the form is posted how can I return the view with a validation message beneath the control - Note I'm trying to do server side validation here?

Below is a kind of example.

<input name="Address" type="text" value="">
<span class="field-validation-valid" data-valmsg-for="Address" data-valmsg-replace="true"></span>


 public ActionResult Create(FormCollection collection)
 {
        if (string.IsNullOrEmpty(collection["Address"])
        {
            // Set the field validation error span message
            ModelState.AddModelError("Address", "This field is required.");

            return View();
        }   
 }

Note: I know how add validation using a view model and data annotations. In this scenario I'm unable to use a view model so need some way to manually validate and return the validation messages back to the view.

The above doesn't seem to work

* Update *

Perhaps using viewData as follows:

<span class="field-validation-valid" data-valmsg-for="Address" data-valmsg-replace="true">@ViewData["Address"]</span>

Have your tried adding @Html.ValidationMessageFor(m => m.Address, "") beneath the control? This should display all model state errors added in your controller for that property. Also there is @Html.ValidationSummary() which displays all model state errors. — zgood
– zgood, Commented Oct 17, 2017 at 16:54
Do what zgood said and also return your model to your view. return View(collection) — David Lee
– David Lee, Commented Oct 17, 2017 at 16:55
Also, don't forget to separate your ActionResults for your Get and Post, not sure if you are trying to combine both here. — David Lee
– David Lee, Commented Oct 17, 2017 at 16:57
Last bit for me, in this instance you should put the [Required] data attribute above your Address property in your model and let the asp.net engine handle this type of validation for you. — David Lee
– David Lee, Commented Oct 17, 2017 at 16:59
@adam78 Well, you could cram all your validation errors in a Dictionary or some type of collection and put that in the ViewBag or whatever, then iterate through that in the View. But without a model all of the seems off. How will you display the values back on the form when it fails validation? It would be a blank form with just validation errors and the user would have to fill out all the fields again. — zgood
– zgood, Commented Oct 17, 2017 at 18:51

Erik Philips · Accepted Answer · 2017-10-19 21:00:05Z

1

I would go with html helpers.

@Html.ValidationMessage("Address")

This will automatically generate the HTML:

<span class="field-validation-valid" data-valmsg-for="address" data-valmsg-replace="true"></span>`

Your code looks correct.

if (string.IsNullOrEmpty(collection["Address"]))
{
  // Set the field validation error span message
  ModelState.AddModelError("Address", "This field is required.");
 return View();
}

edited Oct 19, 2017 at 21:00

Erik Philips

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answered Oct 17, 2017 at 19:32

BinaryBoss

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