Untitled

<?php
if(isset($_GET['api_fb'])) {
  sleep(3);  // simule la latence
  $json = array('retour' => array('data' => true));
  echo json_encode($json);
}
else {
?>
<html>
<head>
  <title></title>
  <meta charset="utf-8">
</head>
<body>
  <button class="facebookUpload">Valider</button>
</body>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
$(document).ready(function() {

  function getAlbum() {
    console.log('Appel API FB, latence ...');
    return $.get('?api_fb');
  }

  $('.facebookUpload').on('click', function() {
    promise = getAlbum();
    promise.then(function(res) {
      console.log('Retour API FB', res);
      console.log('Le traitement à effectuer');
    });
  });

});
</script>
</html>
<?php
}
?>