anchor.diff:        // copy text
         document.execCommand('copy');
         copytarget.blur();
  -      $(this).attr('data-content', 'Copied');
  +      $('#playlist-share-btn-result').attr('data-content', playlist_share_btn_result_content_default);
       }
       catch (err) {
  -      $(this).attr('data-content', 'Please press Ctrl/Cmd+C to copy');
  +      $('#playlist-share-btn-result').attr('data-content', playlist_share_btn_result_content_error);
       }
  -    $(this).popover('show');
  -    setTimeout((function () {
  -        $(this).popover('hide');
  -        $(this).attr('data-content', 'Copy share link');
  -      }).bind(this), 3000);
  +    $('#playlist-share-btn-result').popover('show');
  +    setTimeout(function() {
  +      $('#playlist-share-btn-result').popover('hide');
  +    }, 3000);
     });
   
     var popover_content = '<p>If you get a new link, the previous link will stop working.<p>'+
  
positive.code:     content: 'Copy share link'
    });
  
    $('#playlist-share-btn').click( function (event) {
      var copytarget = $('#playlist-share-link');
      $(this).popover('hide');
  
negative.code:             <div class="col-xs-9">
                <div class="input-group">
                  <input type="text" class="form-control" id="playlist-share-link" value="<%= access_token_url(@playlist) %>" placeholder="<%= access_token_url(@playlist) %>" onClick="this.select();" readonly="readonly">
                  <span class="input-group-btn" id="playlist-share-btn-result">
                    <%= button_tag "Copy", id: 'playlist-share-btn',
                      class: "btn btn-success" %>
                  </span>
  