Make Label Visible When Validation Visible In Asp.net Mvc

When I click submit on view, the system redirects to a new view. If validation fails, the system redirects to the same page highlighting the fields. However, I also require the sys

Solution 1:

I don't think you want to do it like that. Why tell them what the error might be when you can tell them what the error actually is?

In your view, after each @Html.EditorFor put a @Html.ValidationMessageFor.

@Html.TextAreaFor(a => a.EmailID)
@Html.ValidationMessageFor(a => a.EmailID)
@Html.TextAreaFor(a => a.Password)
@Html.ValidationMessageFor(a => a.Password)

If your model state is invalid and you return to the view, the validation messages are automatically displayed for the invalid fields.

Going further, you can get the validation to be done using JavaScript in the browser, so that if the data is invalid the error message(s) will be displayed without needing a trip back to the server.

Simply add the following to the end of your view:

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

(This assumes your site is based on the standard ASP.NET MVC template, and that you view uses a layout view. If not, you may have to do a bit of tweaking to get the correct JavaScript files.)

WARNING: Never rely solely on browser validation checking. It is there as a benefit to users so they get errors reported slightly faster. However, it is very easy for hackers to bypass browser checking, so always check the model state on the server as well.

Solution 2:

If you want exactly that content, then in your controller, when the model is invalid, put

ViewBag.InvalidModel = true;

Then in your view put

@if(ViewBag.InvalidModel)
{
  <!-- Your label here-->
}

Solution 3:

In controller

    public ActionResult Index()
    {
        if (ModelState.IsValid)
        {
            //do something
            return Redirect("/yournewpage");
        }

        if (!someChecks)
        {
            ModelState.AddModelError("", "Your custom error");
        }

        if (!someChecks2)
        {
            ModelState.AddModelError("", "Your custom error 2");
        }

        return View();
    }

You can use in view

<p>
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<p>