title: How to display a datepicker on Symfony?
body: <p>I want to set up a date-picker for my date type fields based on symfony documentation. I have installed the package since packagist 'eternicode / bootstrap-datepicker'. I am able to apply my defined conditions for entering the date field in my js (like the date format) but the display is still impossible. I do not have an error message in my js console. I don't even see the datepikcer component..</p>
  
  <p>My Form Type:</p>
  
  <pre><code>   -&gt;add('date_entree', DateType::class, [ 
                  'widget' =&gt; 'single_text',
                            'html5' =&gt; false,
                            'attr' =&gt; ['class' =&gt; 'js-datepicker'],
                  ])
  
  My JS:
  
      $(document).on('ready', function() {
           $('.js-datepicker').datepicker({
                format: 'dd-mm-yyyy',
           });
       });
  </code></pre>
  
  <p>Have you please an idea about this issue?</p>