{# empty Twig template #}
{{ form_start(form,{'attr':{'id':id|default('form')}}) }}
    {{ form_widget(form) }}
    
      {% if with_submit is not defined or with_submit==true %}
            <input type="button" value="Delete" class="btn btn-md  btn-danger" onclick="answerDo()" />
        {%endif%}
    
    
{{ form_end(form) }}

<script>
    var ms = "{{ message }}";
        
    function answerDo(){
        
        bootbox.confirm(ms,function (result){
                
            if(result == true){
               document.form.submit();
            }
        });
       
    }
    
</script>