{{ form_widget(form.lproduit, {'attr': {'class': 'js-example-basic-single22','placeholder':''}}) }}
                      <br> <br>
                         {{ form_widget(form.quantite,{'attr': {'placeholder':'Quantite'}}) }}



 <link href="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.0.13/dist/js/select2.min.js"></script>
 <script type="text/javascript">
  $(document).ready(function() {

 $('.js-example-basic-single22').select2({
  theme: "classic",
  placeholder: 'CHOISIR UN ARTICLE',
   "language": {
       "noResults": function(){
           return "Aucun resultat trouvé <a href='#' class='btn btn-danger'>Reésayez</a>";
       }
   },
    escapeMarkup: function (markup) {
        return markup;
    }
}); 
      });
 </script>