Showing pictures from a JSON source

I am currently facing an issue while trying to display the cover art along with the search results. There seems to be a problem in the img src tag that is preventing the app from loading properly. Interestingly, when I direct the img to data.tracks[i].album.name (even though it's not a real URL), it works fine. However, as soon as I replace it with an actual URL, the app stops working altogether.

$('#findTracks').click(function (e) {
                e.preventDefault(); // prevent form submission
                $('#recommendations').empty();
                var artist = $('#artist').val();
                var userid = "";
                var playlistid = "";

                $.ajax({
                    url: 'http://ws.spotify.com/search/1/track.json?q=' + artist,
                    type: 'GET',
                    dataType: 'json',
                    success: function(data) {
                        if (data.tracks.length > 0) {
                            var tracksLength = data.tracks.length, html = '';
                            for (var i=0; i<tracksLength; i++) {
                                var href = '';
                                if (data.tracks[i].album.availability.territories.indexOf(' GB ') !== -1) { 
                                    href = data.tracks[i].href;
                                    href = 'makeReq(\''+data.tracks[i].name + ' by '+data.tracks[i].artists[0].name+'\')';
                                    html += '<li><a href="#" onclick="' + href + '">' +data.tracks[i].name + ' by '+data.tracks[i].artists[0].name+ ' <img src="' +data.tracks[i].album.images[0].url+ '" /></a>';html += '</li>';

                                    html += '</li>';
                                }
                            }
                            $('#third').css('display', 'block');
                            $('#recommendations').append(html);
                        } else {
                            $('#recommendations').append('<li>No matches returned.</li>');
                            $('#third').css('display', 'none');
                        }
                    },
                    error: function(err) {
                        alert("The Spotify API failed to return a response.");
                    }
                });                   
            });

This is my first attempt at coding in JavaScript, so please bear with me!

EDIT:

It seems like the code is functioning properly now! However, some of the songs don't respond when I click on them

For instance, when I search for "Don't Stop," only "The Black Eyed Peas - Don’t Stop The Party" seems to work out of the initial ten results...Does anyone know why?

Also, why is "if (data.tracks[i].album.availability.territories.indexOf(' GB ') !== -1)" included in the code? Removing it causes everything to stop working...I am not located in G.B.

javascriptajaxjson

Answer №1

If you take a peek at the console, you'll notice an error popping up:

Uncaught TypeError: Cannot read property '0' of undefined

Upon inspecting the data retrieved by the query, it's evident that data.tracks[i].album does return:

{
    "released": "2006",
    "href": "spotify:album:2knAf4wg8Gff8q1bXiXCTz",
    "name": "The Dutchess",
    "availability": {
        "territories": "MX"
    }
}

Unfortunately, the property images doesn't exist. So, attempting to access:

data.tracks[i].album.images[0]

leads to the undefined error, causing the script to stop executing.
I'm not very familiar with the Spotify API, but a quick look at the api reveals the endpoint for get-album. Here's a workaround I came up with to fetch the album art

$.get("http://ws.spotify.com/search/1/track.json?q=Fergie",function(data){
   var albumId = data.tracks[97].album.href.split(":")[2];
   $.get("https://api.spotify.com/v1/albums/" + albumId,function(albumResponse){
       var firstImage = albumResponse.images[0];
       $('body').append($('<img/>',{
          src : firstImage.url,
          width : firstImage.width,
          height : firstImage.height
       }));
   })
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body></body>

It would be beneficial to delve deeper into retrieving the album art since I'm unsure if this is the most efficient solution.

The search endpoint you mentioned differs from the one you are currently using.

   The one you are using
   url: 'http://ws.spotify.com/search/1/track.json?q=' + artist,
   The one you linked to
   url: 'https://api.spotify.com/v1/search?q=' + artist + '&type=track,artist&market=GB',

Here's your solution with the modification in endpoint 

$('#findTracks').click(function(e) {
  e.preventDefault(); // override/don't submit form
  $('#recommendations').empty();
  var artist = $('#artist').val();
  var userid = "";
  var playlistid = "";

  $.ajax({
    //url: 'http://ws.spotify.com/search/1/track.json?q=' + artist,
    url: 'https://api.spotify.com/v1/search?q=' + artist + '&type=track,artist&market=GB',
    type: 'GET',
    dataType: 'json',
    success: function(data) {
      if (data.tracks.items.length > 0) {
        data.tracks = data.tracks.items
        data.artists = data.artists.items
        var tracksLength = data.tracks.length,
          html = '';
        for (var i = 0; i < tracksLength; i++) {
          var href = '';
          href = data.tracks[i].href;
          href = 'makeReq(\'' + data.tracks[i].name + ' by ' + data.tracks[i].artists[0].name + '\')';
          html += '<li><a href="#" onclick="' + href + '">' + data.tracks[i].name + ' by ' + data.tracks[i].artists[0].name + ' <img src="' + data.tracks[i].album.images[0].url + '" /></a>';
          html += '</li>';
          html += '</li>';

        }
        $('#third').css('display', 'block');
        $('#recommendations').append(html);
      } else {
        $('#recommendations').append('<li>No matches returned.</li>');
        $('#third').css('display', 'none');
      }
    },
    error: function(err) {
      alert("The Spotify API failed to return a response.");
    }
  });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Artist:
<input type="text" id="artist" />
<button id="findTracks">Find Tracks</button>
<div id="recommendations"></div>

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