如何仅更改输入表单控件的错误消息颜色

Question

I am trying to style my first website. I am using Bootstrap 4 and the jquery validation plugin and I am doing a form right now. I have two problems: First, I only want to change the color of the error message below my input, but my styling changes the input text size/color and the error message text size/color, how can I only change error text below an input?

Second question is, where in my code do I change the Bootstrap form control state, depending on valid or not?

This is my code so far:

 $('document').ready(function(){ $('#registration_form').validate({ rules: { username: { required: true, maxlength: 10, minlength: 3 }, email: { required: true, email: true }, email_con: { required: true, equalTo: "#email" }, password: { required: true, minlength: 7 }, password_con: { required: true, equalTo: "#password" }, formCheck: { required: true }, } }); });

 .error{ color: red; font-Size: 13px; }

 <div class="form-row form-group"> <div class="col-sm-4 col-xl-3 text-center d-xl-flex justify-content-xl-center align-items-xl-center label-column"><label class="col-form-label">Email* :</label></div> <div class="col-sm-6 input-column"><input class="form-control" type="email" name="email" id="email" placeholder="name@mail.com"></div> </div>

Answer 1

If you want to change color of error text message only then write like label.error{color: red;} and follow below html structure.

 $(document).ready(function(){ $('#registration_form').validate({ rules: { email: { required: true, email: true } } }); });

 label.error{ color: red; font-size: 13px; }

 <link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"> <script src="https://code.jquery.com/jquery-3.4.1.min.js"></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.1/jquery.validate.min.js"></script> <div class="container my-2"> <div class="row"> <form class="col-sm-12" action="#" id="registration_form"> <div class="form-row form-group"> <div class="col-sm-4 text-sm-right"> <label class="col-form-label" for="email">Email* :</label> </div> <div class="col-sm-6"> <input class="form-control" type="email" name="email" id="email" placeholder="name@mail.com"> </div> </div> <div class="form-row form-group"> <div class="col-sm-6 offset-sm-4"> <button type="submit" class="btn btn-success">Submit</button> </div> </div> </form> </div> </div>

Answer 2

There are classes to deal with validaiton when it comes to bootstrap usage. Try like this

<div class="container">
<p class="h1">Register</p>

<form class="needs-validation" novalidate>
<div class="form-group">
  <label for="email">E-mail</label>
  <input type="email" class="form-control" id="email"
         placeholder="E-mail" required>
  <div class="valid-feedback">
    Looks good!
  </div>
  <div class="invalid-feedback">
    The e-mail is required!
  </div>
</div>

<div class="form-group">
  <label for="password">Password</label>
  <input type="password" class="form-control" id="password"
         placeholder="Password" required minlength="6">
  <div class="valid-feedback">
    Great!
  </div>
  <div class="invalid-feedback">
    The password must contain at least 6 characters!
  </div>
</div>

<div class="form-group mt-3">
  <button class="btn btn-primary" type="submit">Register!</button>
</div>
</form>
</div>

<script>
(function() {
window.addEventListener('load', function() {
  var forms = document.getElementsByClassName('needs-validation');

  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);
})();
</script>

Answer 3

You can run a snippet in full page and check this answer

 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet"/> <div class="container"> <p class="h1">Register</p> <form class="needs-validation" novalidate> <div class="form-group"> <label for="email">E-mail</label> <input type="email" class="form-control" id="email" placeholder="E-mail" required> <div class="valid-feedback"> Looks good! </div> <div class="invalid-feedback"> The e-mail is required! </div> </div> <div class="form-group"> <label for="password">Password</label> <input type="password" class="form-control" id="password" placeholder="Password" required minlength="6"> <div class="valid-feedback"> Great! </div> <div class="invalid-feedback"> The password must contain at least 6 characters! </div> </div> <div class="form-group mt-3"> <button class="btn btn-primary" type="submit">Register!</button> </div> </form> </div> <script> (function() { window.addEventListener('load', function() { var forms = document.getElementsByClassName('needs-validation'); 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); })(); </script>