bootstrap-multiselects/validation.html at main · mdbootstrap/bootstrap-multiselects · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
  <meta http-equiv="x-ua-compatible" content="ie=edge" />
  <title>Material Design for Bootstrap</title>
  <!-- MDB icon -->
  <link rel="icon" href="img/mdb-favicon.ico" type="image/x-icon" />
  <!-- Font Awesome -->
  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.15.2/css/all.css" />
  <!-- Google Fonts Roboto -->
  <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&display=swap" />
  <!-- MDB -->
  <link rel="stylesheet" href="css/bootstrap-multiselect.min.css" />
</head>

<body>
  <!-- Start your project here-->
  <form class="needs-validation" novalidate>
    <select
      class="select" multiple
      id="basic-select"
      data-mdb-validation="true"
      data-mdb-valid-feedback="This value is valid"
      data-mdb-invalid-feedback="This value is invalid"
      data-mdb-clear-button="true"
    >
      <option value="1">One</option>
      <option value="2">Two</option>
      <option value="3">Three</option>
      <option value="4">Four</option>
      <option value="5">Five</option>
      <option value="6">Six</option>
      <option value="7">Seven</option>
      <option value="8">Eight</option>
    </select>
    <button type="submit" id="submit" class="btn btn-primary btn-sm mt-3">
      Submit
    </button>
  </form>
  <!-- End your project here-->

  <!-- MDB -->
  <script type="text/javascript" src="js/mdb.min.js"></script>
  <!-- Custom scripts -->
  <script type="text/javascript"></script>
  <!-- Custom scripts -->
  <script>
    (() => {
      'use strict';

      // Fetch all the forms we want to apply custom Bootstrap validation styles to
      const forms = document.querySelectorAll('.needs-validation');

      // Loop over them and prevent submission
      Array.prototype.slice.call(forms).forEach((form) => {
        form.addEventListener('submit', (event) => {
          event.preventDefault();
          event.stopPropagation();

          form.classList.add('was-validated');
        },false);
      });
    })();
  </script>

</body>

</html>