youtube.js Documentation

Wikipedia: "A JavaScript library is a library of pre-written JavaScript which allows for easier development of JavaScript-based applications."

jQuery is an example of a popular library today. youtube.js is another example of a library, written by Pamela Fox, that contains pre-written JavaScript that you can use.

In the youtube.js library, there are four functions you can use:

1. Get the Video ID from a Video URL
   
   Syntax:

   youtube.getIdFromUrl(videoUrlOrID)

   Expects an argument (videoUrlOrID) that is either a youtube video URL or a video ID and returns back the video's ID.
   
   Example:

   var vid_id = youtube.getIdFromUrl('http://www.youtube.com/watch?v=epUk3T2Kfno');
   //vid_id equals 'epUk3T2Kfno' (notice where the ID is in the original url)

   
   
2. Generate a Thumbnail URL from a Video URL
   
   Syntax:

   youtube.generateThumbnailUrl(videoUrlOrID)

   Expects an argument (videoUrlOrID) that is either a youtube URL or a ID and returns back the URL of the thumbnail for that video.
   
   Example:

   var vid_thumbnail = youtube.generateThumbnailUrl('http://www.youtube.com/watch?v=epUk3T2Kfno');
   //vid_thumbnail equals 'http://i3.ytimg.com/vi/epUk3T2Kfno/default.jpg' (notice how the video's ID is inserted in the middle of the image url)

   
   
3. Generate the URL to Watch a Video from the Video ID
   
   Syntax:

   youtube.generateWatchUrl(videoUrlOrID)

   Expects an argument (videoUrlOrID) that is either a youtube URL or a ID and returns back the URL for that video.
   
   Example:

   var vid_watch = youtube.generateWatchUrl('epUk3T2Kfno');
   //vid_watch equals 'https://www.youtube.com/watch?v=epUk3T2Kfno' (notice where the video ID is in the url)

   
   
4. Generate the URL to Embed a Video from the Video ID
   
   Syntax:

   youtube.generateEmbedUrl(videoUrlOrID)

   Expects an argument (videoUrlOrID) that is either a youtube URL or a ID and returns back the embed URL for that video.
   
   Example:

   var vid_embed = youtube.generateEmbedUrl('http://www.youtube.com/watch?v=epUk3T2Kfno');
   //vid_embed equals 'http://www.youtube.com/embed/epUk3T2Kfno' (notice where the video ID is in the url)