"AJAX Validation"
Bootstrap 4.1.1 Snippet by verdelmanzano06

<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>AJAX form check</title> </head> <body> <form action="validator.php" method="POST" id="myForm"> <label>Name: </label> <input type="text" class="form-group" name="name" /> <span class="error-name error">Missing Name</span> <br> <label>Email: </label> <input type="email" class="form-group" name="email" /> <span class="error-email error">Missing Email</span> <br> <button type="submit">Submit</button> </form> <div id="message"></div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> </body> </html>
.error {display:none;color:red;}
$(document).ready(function(){ $('#myForm').submit(function(e){ // Remove the default function of form element e.preventDefault(); // Hide the error if success $('.error').hide(); // Serializing data var data = $(this).serialize(); // Message after send $('#message').html('Sending...'); console.log(data); $.ajax({ type: 'POST', url: 'validator.php', data: data, dataType: 'json', success: function(d) { console.log(d); // Message 'FAIL' $('#message').html('<div>'+ d.message +'</div>'); // Condition if it's success if (d.success) { // Message 'SUCCESS' $('#message').html('<div>'+ d.message +'</div>'); } else { // Condition if errors name or email isn't exists, show the error and text. if (d.errors.name) $('span.error-name').show().text(d.errors.name); if (d.errors.email) $('span.error-email').show().text(d.errors.email); } } }); }); });

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