panel/app/assets/javascripts/validation.js

$(document).on('turbolinks:load', function() {
  // Previene el envío del formulario al presionar <Enter>
  $(document).on('keypress', '.post :input:not(textarea):not([type=submit])', function(e) {
    if (e.keyCode == 13) {
      e.preventDefault();
      e.stopPropagation();
    }
  });

  // Al enviar el formulario del artículo, aplicar la validación
  $('.submit-post').click(function(e) {
    var form = $(this).parents('form.form');
    var invalid_help = $('.invalid_help');
    var sending_help = $('.sending_help');

    invalid_help.addClass('d-none');
    sending_help.addClass('d-none');
    form.find('[aria-invalid="true"]')
      .attr('aria-invalid', false)
      .attr('aria-describedby', function() {
        return $(this).siblings('.feedback').attr('id');
      });

    if (form[0].checkValidity() === false) {
      e.preventDefault();
      e.stopPropagation();
      invalid_help.removeClass('d-none');

      form.find(':invalid')
        .attr('aria-invalid', true)
        .attr('aria-describedby', function() {
          return $(this).siblings('.invalid-feedback').attr('id');
        });
    } else {
      sending_help.removeClass('d-none');
    }

    form.addClass('was-validated');
  });

  $('.submit-post-incomplete').click(function(e) {
    $('.sending_help').removeClass('d-none');
  });
});