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<!-- https://mailbrother.com/blog/a-guide-to-bootstrap-5-form-validation https://www.codexworld.com/code-snippets/html-form-validation-with-bootstrap/ https://www.geeksforgeeks.org/how-to-validate-email-id-in-jquery/ https://emretulek.github.io/jbvalidator/index.html https://www.jqueryscript.net/form/bootstrap-compatible-validator.html https://emretulek.github.io/jbvalidator/index.html +++++ --> <!DOCTYPE html> <html> <head> <title>Bootstrap Form Validation Example</title> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> </head> <body> <div class="container"> <h1>Bootstrap Form Validation Example</h1> <form id="myForm" class="needs-validation" novalidate> <div class="form-group"> <label for="name">Name:</label> <input type="text" class="form-control" id="name" required> <div class="invalid-feedback"> Please enter your name. </div> </div> <div class="form-group"> <label for="email">Email:</label> <input type="email" class="form-control" id="email" required> <div class="invalid-feedback"> Please enter a valid email address. </div> </div> <button type="submit" class="btn btn-primary">Submit</button> </form> </div> <script> // Add event listener to the form's submit event document.getElementById("myForm").addEventListener("submit", function(event) { event.preventDefault(); // Prevent form submission if validation fails if (this.checkValidity() === false) { event.stopPropagation(); // Stop the event from propagating further } this.classList.add("was-validated"); // Add 'was-validated' class to enable Bootstrap's styling }, false); </script> </body> </html>