Spotify Apps API - Get songs from a playlist URL

spotify-apps-tutorial-get_songs_from_playlist.js

/* Instantiate the global sp object; include models & views */
var sp = getSpotifyApi(1);
var models = sp.require("sp://import/scripts/api/models");

var playlist_url = 'http://open.spotify.com/user/jkeck99/playlist/21iMSq0jzTie7m7v4UcMlV';

var pl = models.Playlist.fromURI(playlist_url, function(playlist) {
    for(i=0;i<playlist.tracks.length;i++){
        var link = '<li><a href="' + playlist.tracks[i].uri + '">' + playlist.tracks[i].name + '</a></li>';
       $('#playlist').append(link);
    }
});

thank for sharing!