(function ($) {

/**
 * Auto-hide summary textarea if empty and show hide and unhide links.
 */
Drupal.behaviors.textSummary = {
  attach: function (context, settings) {
    $('.text-summary', context).once('text-summary', function () {
      var $widget = $(this).closest('div.field-type-text-with-summary');
      var $summaries = $widget.find('div.text-summary-wrapper');

      $summaries.once('text-summary-wrapper').each(function(index) {
        var $summary = $(this);
        var $summaryLabel = $summary.find('label');
        var $full = $widget.find('.text-full').eq(index).closest('.form-item');
        var $fullLabel = $full.find('label');

        // Create a placeholder label when the field cardinality is
        // unlimited or greater than 1.
        if ($fullLabel.length == 0) {
          $fullLabel = $('<label></label>').prependTo($full);
        }
        var $link = $('<span class="form-required" title="This field is required.">*</span>').appendTo($summaryLabel);
        return;
      });
    });
  }
};

})(jQuery);