Scripts for controlling YouTube videos. Inspiration taken from https://gist.github.com/fent/7763775

youtube_next.applescript

# Next Youtube Video in Playlist
tell application "Google Chrome"
  repeat with t in tabs of windows
    tell t
      if URL starts with "http://www.youtube.com/watch" or URL starts with "https://www.youtube.com/watch" then
        execute javascript "
        var player = document.getElementById('movie_player') || document.getElementsByTagName('embed')[0];
        
        if (player) {
          document.getElementsByClassName('ytp-next-button')[0].click()
		    }
        "
        exit repeat
      end if
    end tell
  end repeat
end tell

youtube_play_pause.applescript

# Play or pause a video.
tell application "Google Chrome"
  repeat with t in tabs of windows
    tell t
      if URL starts with "http://www.youtube.com/watch" or URL starts with "https://www.youtube.com/watch" then
        execute javascript "
        var player = document.getElementById('movie_player') || document.getElementsByTagName('embed')[0];
    
        if (player) {
          document.getElementsByClassName('ytp-play-button')[0].click()
		    }
        "
        exit repeat
      end if
    end tell
  end repeat
end tell

youtube_previous.applescript

# Previous Youtube Video in Playlist
tell application "Google Chrome"
  repeat with t in tabs of windows
    tell t
      if URL starts with "http://www.youtube.com/watch" or URL starts with "https://www.youtube.com/watch" then
        execute javascript "
        var player = document.getElementById('movie_player') || document.getElementsByTagName('embed')[0];
        
        if (player) {
          document.getElementsByClassName('ytp-prev-button')[0].click()
		    }
        "
        exit repeat
      end if
    end tell
  end repeat
end tell