jfu-1.0.x-dev/assets/js/jfu_text_format.js

(function ($) {
  Drupal.behaviors.jfu_text_format = {
    attach: function(context, settings) {
      $(document).on('ajaxSend', function(event, jqxhr, settings) {
        if (settings.url.indexOf('jfu/dialog/text-format') !== -1) {
          var element = event.target.activeElement;
          var data_format = element.getAttribute('data_format');
          var url = settings.url;
          url = url + '&data_format=' + data_format;
          settings.url = url;
        }
      });
    }
  }
}(jQuery));