code: function($el) {
      this._stopSpinner();
  
      var $el = this.$el.find('.loading');
  
      if ($el) {
        // Check if it is dark or other to change color
        var template_dark = this.model.get('template_name').search('dark') != -1;
  
        if (template_dark) {
          this.spin_options.color = '#FFF';
        } else {
          this.spin_options.color = 'rgba(0,0,0,0.5)';
        }
  
        this.spinner = new Spinner(this.spin_options).spin();
        $el.append(this.spinner.el);
      }
    }
docs: Start loading spinner