How to apply bootstrap v4 form input validation classes with the ASP.NET Razor syntax?

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The following code:

View:(is-valid)

<div class="form-group">
    @Html.LabelFor(m => m.Telefone, new { @class = "font-weight-bold" })
    @Html.TextBoxFor(m => m.Telefone, new { @class = "form-control is-valid", @placeholder = "Digite seu telefone" })
    @Html.ValidationMessageFor(m => m.Telefone, "", new { @class = "text-danger" })
</div>

View:(is-invalid)

<div class="form-group">
    @Html.LabelFor(m => m.Telefone, new { @class = "font-weight-bold" })
    @Html.TextBoxFor(m => m.Telefone, new { @class = "form-control is-invalid", @placeholder = "Digite seu telefone" })
    @Html.ValidationMessageFor(m => m.Telefone, "", new { @class = "text-danger" })
</div>

Example: https://getbootstrap.com/docs/4.3/components/forms/#server-side

Any solution ?

Simple solution by using Tag Helpers:

        <div class="form-group">
            <input asp-for="Email" class="form-control">
            <div class="invalid-feedback" style="display:block;">
                <span asp-validation-for="Email"></span>
            </div>
        </div>

How to use Bootstrap style validation in ASP.NET Core, Simple solution by using Tag Helpers: <div class="form-group"> <input asp-for="​Email" class="form-control"> <div class="invalid-feedback" style="display:block  Asp.Net MVC Razor BootStrap Input Form. You can add CSS classes using Razor syntax as shown below. All you need to do is specify the Bootstrap class(es) you want

Razor uses jQuery validation. You only need to hock jq-valid with Bootstrap:

$('form').validate().settings.errorClass += ' is-invalid';
$('form').validate().settings.validClass += ' is-valid';

Validating User Input in ASP.NET Web Pages (Razor) Sites , This post is about using Bootstrap 4 style validation in ASP.NET NET MVC Core application without bootstrap styles. class="needs-validation" novalidate> <div class="form-group"> <label asp-for="Name"></label> <input  Whichever way you do it, you’ll install the Bootstrap 4 nuget package. Installing that package will overwrite the bootstrap.js file in the Scripts folder and the bootstrap.css file in the Content folder. It will also add a number of other files to those two folders, most of which you don’t need to worry about.

be sure to include : "jquery .js jquery.validate .js jquery.validate.unobtrusive .js"

ASP.NET Core 2.2, NET · ASP.NET 4.x · Web Pages · Guidance · UI, Layouts, and Themes; Validating User Input in ASP. For example, you don't want to process a form that's missing critical information. Validation errors that use CSS style classes NET Web Pages 2, you can use the Validator helper to test user input. Add validation to an ASP.NET Core Razor Page. 7/23/2019; 9 minutes to read +6; In this article. By Rick Anderson. In this section, validation logic is added to the Movie model. The validation rules are enforced any time a user creates or edits a movie.

ASP Forms, NET Core 2.2 Razor Pages project with Individual User Accounts, UserName" class="form-control" /> <span asp-validation-for="Input. Build, run and Register without the required fields. because it throws SyntaxError with Firefox v69.0.1 - invalid regexp group d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\. To enable and disable the submit button based on form validation: Use the form's EditContext to assign the model when the component is initialized. Validate the form in the context's OnFieldChanged callback to enable and disable the submit button. Unhook the event handler in the Dispose method. For more information, see ASP.NET Core Blazor

Powerful Form Field Validator For Jquery And Bootstrap Using , Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java  Now you can develop your ASP.NET web forms application using bootstrap user interface. To know more about using the bootstrap classes with server-side HTML controls and Web Form Controls see the section below ↓. B. Steps To Add Bootstrap In ASP.NET Web Forms (Manual – Without NuGet)

Modal Input Forms in ASP.NET MVC - Simple Talk, In this article you will learn about Powerful Form Field Validator for Jquery and <div class="col-lg-5"> <input type="text" class="form-control" UI View looks like this after adding form and applying bootstrap. I am using Html elements for validating form fields in asp.net, if you are using in ASP.NET MVC. Validating User Input in ASP.NET Web Pages (Razor) Sites. 02/20/2014; 10 minutes to read; In this article. by Tom FitzMacken. This article discusses how to validate information you get from users — that is, to make sure that users enter valid information in HTML forms in an ASP.NET Web Pages (Razor) site.

Comments
  • This helped me: stackoverflow.com/a/44387981/2588539