Why does audio.buffered.end(0) get an error message when I try to get buffered time

Question

I\'m building mp3 playlist player with HTML5 and jQuery. At this player there is a horizontal bar grow gradually in conjunction with the buffered present of mp3 file.

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Answer 1

track = document.getElementById("music");
track.onprogress = function(){
    if(track.buffered.length>0){
        var w = 100*(track.buffered.end(0))/track.duration;
        $('#buffered').css("width",w+"%");
    }
}