anchor.diff:      content: 'Copy share link'
     });
   
  +  var playlist_share_btn_result_content_default = "Copied to clipboard";
  +  var playlist_share_btn_result_content_error = "Please press Ctrl/Cmd+C to copy";
  +  $('#playlist-share-btn-result').popover({
  +    trigger: 'manual',
  +    placement: 'top',
  +    content: playlist_share_btn_result_content_default
  +  });
  +
     $('#playlist-share-btn').click( function (event) {
       var copytarget = $('#playlist-share-link');
       $(this).popover('hide');
  
positive.code:       // copy text
        document.execCommand('copy');
        copytarget.blur();
        $(this).attr('data-content', 'Copied');
      }
      catch (err) {
        $(this).attr('data-content', 'Please press Ctrl/Cmd+C to copy');
      }
      $(this).popover('show');
      setTimeout((function () {
          $(this).popover('hide');
          $(this).attr('data-content', 'Copy share link');
        }).bind(this), 3000);
    });
  
    var popover_content = '<p>If you get a new link, the previous link will stop working.<p>'+
  
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>
  