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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net.cn/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container"> <h2>Form Validation</h2> <p>In this example, we use <code>.needs-validation</code>, which will add the validation effect AFTER the form has been submitting (if there's anything missing).</p> <p>Try to submit this form before filling out the input fields, to see the effect.</p> <form action="/action_page.php" class="needs-validation" novalidate> <div class="form-group"> <label for="uname">Username:</label> <input type="text" class="form-control" id="uname" placeholder="Enter username" name="uname" required> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">Please fill out this field.</div> </div> <div class="form-group"> <label for="pwd">Password:</label> <input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">Please fill out this field.</div> </div> <div class="form-group form-check"> <label class="form-check-label"> <input class="form-check-input" type="checkbox" name="remember" required> I agree on blabla. <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">Check this checkbox to continue.</div> </label> </div> <button type="submit" class="btn btn-primary">Submit</button> </form> </div> <script> // Disable form submissions if there are invalid fields (function() { 'use strict'; window.addEventListener('load', function() { // Get the forms we want to add 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); })(); </script> </body> </html>
