使用Amplitude.js继续下一页的歌曲

I am using Amplitude.js to play songs which are dynamic. Server side script is php. My goal is to check if any song is playing, if yes than before that page is navigated away then save that song's index and current position (in percentage). Then on the next page I have to continue that song from the same position. So far I am successful in playing the same song on the next page, but it is playing from the start.

Here $feat is an array created like :

$featured = array();
        foreach ($all as $key => $value) {
           array_push($featured, array(
                "id" => $value['audio_id'],
                "name" => $value['audio_name'],
                "artist" => $value['audio_artist'],
                "album" => $value['product_name'],
                "url" => l($value['audio_file_path'].$value['audio_file']),
                "cover_art_url" =($value['product_image_path'].$value['product_image']),
           ));
        }

My javascript code to intitialize Amplitude js:

<script>
Amplitude.setDebug( true );
let _songs = JSON.parse('<?=$feat?>');
Amplitude.init({
  "songs":_songs,
});
</script>

On the change of every page, I am saving the song current index and current percentage of the song played. Its working fine. Home/song_stats will save the song info in session

<script>
    $(window).on("beforeunload", function() {
    song_percent =  Amplitude.getSongPlayedPercentage();
    song_index = Amplitude.getActiveIndex();

    $.ajax({
      type: "POST",
      url: "<?=g('base_url')?>Home/song_stats", 
      data:  "song_percent="+song_percent+"&song_index="+song_index,
      dataType: "json"
    });
    return false;    
    });

</script>

This javascript code is playing the song on click and if any session data is available to continue the song, it will continue that song.

<script>
$(window).load(function(){

  function playmysongs(_index){
  $('div[amplitude-song-index="'+_index+'"]').click();
}


  var appender = '';
  for(var i =0;i<_songs.length;i++){
    appender+='<div class="rixinside-list"><a onclick="playmysongs('+i+')"><span class="album_img"><img src="'+_songs[i].cover_art_url+'" class="img-responsive"/></span><span class="album_name">'+_songs[i].album+'<span class="album_artist">'+_songs[i].artist+'</span></span></a></div>';
  }
$('#playlist-container .rixplaylist').append(appender);

  //cont song
     $.ajax({
      type: "POST",
      url: "<?=g('base_url')?>Home/continue_song",
      data:  "",
      dataType: "json",
      success: function(response){
        playmysongs(response.song_index);
        Amplitude.setSongPlayedPercentage(response.song_percent);
      }
    });
    return false;  
    //cont song end
});


$('#playlist-container').click(function(){
  $('.rixplaylist').toggle();
});
$('#wishlist-container i').click(function(){
  $(this).toggleClass('like');
});

The line below doesn't work, although "response.song_percent" is showing correct value. Any help will be appreciated. Amplitude.setSongPlayedPercentage(response.song_percent);