Select/Multiple/jQuerySelectMultiple.html

<!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 name="description"
        content="The faster, lighter and more secure version of the Bootstrap JavaScript components.">
  <meta name="keywords" content="JavaScript,Native JavaScript,native,Bootstrap,plugins,jQuery">
  <meta name="author" content="thednp">
  <link rel="shortcut icon" href="../../bootstrap.native-master/assets/img/favicon.ico">
  <link rel="apple-touch-icon" href="../../bootstrap.native-master/assets/img/apple-touch-icon.png">
  <title>jQuery Template</title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
  <link rel="stylesheet" href="../../bootstrap.native-master/assets/css/offcanvas.css">
  <link rel="stylesheet" href="../../bootstrap.native-master/assets/css/prism.css">
  <link rel="stylesheet" href="../../bootstrap.native-master/assets/css/theme.css">
  <style>
    .form-control {
      height: 400px;
      overflow: hidden;
    }
    #exampleFormControlSelect2 {
      height: 400px;
      overflow: hidden;
    }
    .top20 {
      margin-top: 20px;
    }
  </style>
</head>
<body>
<div class="container top20">
  <div class="row">
    <div class="col-6">
      <div class="form-group">
        <label for="exampleFormControlSelect2">Seleccion multiple</label>
        <select multiple class="form-control" id="exampleFormControlSelect2" onclick="mostrar()">
        </select>
      </div>
    </div>
    <div class="col-6">
      Elegidos:
      <ul id="elegidos">
      </ul>
    </div>
  </div>
</div>
<script
    src="https://code.jquery.com/jquery-3.5.1.min.js"
    integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0="
    crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap.native@3.0.5/dist/bootstrap-native.min.js"
        integrity="sha256-CQiZw1XNLEFM6OEgZ8FR1/nTISQD7Y6i7m3beKI2BfM=" crossorigin="anonymous"></script>
<script src="lista.js"></script>
<script>
  const listSelect = jQuery('#exampleFormControlSelect2')
  const elegidos = jQuery('#elegidos')
  listSelect.empty()
  listaTotal.every(item => listSelect.append(templateOption(item)))

  function mostrar() {
    const listOptions = jQuery('#exampleFormControlSelect2 option:selected')
    elegidos.empty()
    listOptions.each(function (){
      const item = listaTotal.find(element => element.index===parseInt(jQuery(this).val()))
      if (!item) {
        return
      }
      elegidos.append(templateLI(item))
    })
  }
  function templateOption({titulo, index}) {
    return `<option value="${index}">${titulo} (${index})</option>`
  }
  function templateLI({titulo: texto}) {
    return `<li>${texto}</li>`
  }
</script>
</body>
</html>