How to disable bootstrap 4 validation style from valid controls

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I’m using bootstrap 4 styling for my application. Application has two text boxes and one submit button. When you click the “Save” button it will call a web API and get some details asynchronously(it will not redirect the page). Validation applied for the first text box only.

(function() {
  'use strict';
  window.addEventListener('load', function() {
    // Fetch all the forms we want to apply custom Bootstrap validation styles to
    var forms = document.getElementsByClassName('needs-validation');
    // Loop over them and prevent submission
    var validation = Array.prototype.filter.call(forms, function(form) {
      form.addEventListener('submit', function(event) {
        if (form.checkValidity() === false) {
          event.preventDefault();
          event.stopPropagation();
        }
        form.classList.add('was-validated');
      }, false);
    });
  }, false);
})();
<!DOCTYPE html>
<html>

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
  <title>Test Page</title>
</head>

<body>
  <form class="container needs-validation" novalidate>
    <div class="form-group row mt-5">
      <label for="txtSessionDescription" class="col-2 col-md-2 col-sm-2 col-form-label">Name</label>
      <div class="col-sm-10">
        <input type="tel" class="form-control" placeholder="Please enter your name" required />
        <div class="invalid-feedback">
          Please enter the name.
        </div>
      </div>
    </div>
    <div class="form-group row mt-5">
      <label for="txtSessionDescription" class="col-2 col-md-2 col-sm-2 col-form-label">Address:</label>
      <div class="col-sm-10">
        <input type="tel" class="form-control" />
      </div>
    </div>
    <div class="form-group row">
      <input type="submit" class="btn btn-primary" style="width: 100px;" value="Save" />
    </div>
  </form>
</body>

</html>

My problem:

When I click the “Save” button without entering any values to the text boxes, green color style(validation true style) is applying to the “Address” textbox. I don’t wont that to happen.

I only need red color style(validation failed style) to be applied if the validation is failed. If the values are entered(validation is true), I don’t need any styling to be applied to the text boxes.

Also when I enter some value to the “Name” text box and click the “Save” button, I don’t want green color styling for that text box.

Screenshot:

Screenshot

Answer

I, for one, do not like overriding the CSS style so you could also choose to just specify which fields to validate instead of the entire form.

Add a class to your .form-group element (e.g. .validate-me)

    <form class="container needs-validation" novalidate>
        <div class="form-group row mt-5 validate-me">
            <label for="txtSessionDescription" class="col-2 col-md-2 col-sm-2 col-form-label">Name</label>
            <div class="col-sm-10">
                <input type="text" class="form-control" placeholder="Please enter your name" required />
                <div class="invalid-feedback">
                    Please enter the name.
                </div>
            </div>
        </div>
        <div class="form-group row mt-5">
            <label for="txtSessionDescription" class="col-2 col-md-2 col-sm-2 col-form-label">Address:</label>
            <div class="col-sm-10">
                <input type="tel" class="form-control" formnovalidate="formnovalidate" id="address" />
            </div>
        </div>
        <div class="form-group row">
            <input type="submit" class="btn btn-primary" style="width: 100px;" value="Save"/>
        </div>
    </form>

Now change your JavaScript slightly, retrieve all the form-groups with the validate-me class and instead of calling form.classList.add('was-validated') loop through all the captured form-groups and add was-validated to them instead.

window.addEventListener('load', function () {
                // Fetch all the forms we want to apply custom Bootstrap validation styles to
                var forms = document.getElementsByClassName('needs-validation');

                // Get all form-groups in need of validation
                var validateGroup = document.getElementsByClassName('validate-me');

                // Loop over them and prevent submission
                var validation = Array.prototype.filter.call(forms, function (form) {
                    form.addEventListener('submit', function (event) {
                        if (form.checkValidity() === false) {
                            event.preventDefault();
                            event.stopPropagation();
                        }

                        //Added validation class to all form-groups in need of validation
                        for (var i = 0; i < validateGroup.length; i++) {
                            validateGroup[i].classList.add('was-validated');
                        }
                    }, false);
                });
            }, false);


Source: stackoverflow