无法显示来自音乐 API 的 JSON 数据

Question

I am having trouble to display the top tracks of a searched artist using the LastFM api to get data. The api returns an object toptracks. I would like to grab details about each of the top tracks from that api data.

I am not sure if I am on the right track. Can someone take a look and let me know if I am doing something wrong?

Sample data from api:

{
    "toptracks": {
        "track": [{
                "name": "Best I Ever Had",
                "playcount": "3723918",
                "listeners": "1086968",
                "mbid": "00bde944-7562-446f-ad0f-3d4bdc86b69f",
                "url": "https://www.last.fm/music/Drake/_/Best+I+Ever+Had",
                "streamable": "0",
                "artist": {
                    "name": "Drake",
                    "mbid": "b49b81cc-d5b7-4bdd-aadb-385df8de69a6",
                },
                "@attr": {
                    "rank": "1"
                }
            },
            {
                "name": "Forever",
                "playcount": "1713492",
                "listeners": "668998",
                "url": "https://www.last.fm/music/Drake/_/Forever",
                "streamable": "0",
                "artist": {
                    "name": "Drake",
                    "mbid": "b49b81cc-d5b7-4bdd-aadb-385df8de69a6",
                },
                "@attr": {
                    "rank": "2"
                }
            }
}

function renderTracks(trackArray) {

    function createHTML(track){
        return `<h1>${track.name}</h1>
                <h2>${track.artist[0]}</h2>
                <h3>${toptracks[1].rank}</h3> 
                <h3>${track.playcount}</h3>`;

    };

    trackHTML = trackArray.map(createHTML);

    return trackHTML.join("");

};





    var searchString = $(".search-bar").val().toLowerCase();
    var urlEncodedSearchString = encodeURIComponent(searchString); 

    const url = "lastFMwebsite" 

    axios.get(url + urlEncodedSearchString).then(function(response) {
    // createHTML.push(response.data.track);
    // $(".tracks-container").innerHTML = renderTracks(response.data.track);
    // comented out old code above 
    createHTML.push(response.toptracks.track);
    $(".tracks-container").innerHTML = renderTracks(response.toptracks.track);


})

Answer 1

Your input JSON is not valid. You'll need to format it correctly. Once the data is correct:

createHTML.push(response.toptracks.track[0])

or

let i = 0;
for(; i < response.toptracks.track.length; i++){
 createHTML.push(response.toptracks.track[i]);
}

Answer 2

I've notice that you have not parsed the response:

axios.get(url + urlEncodedSearchString).then(function(response) {
    var parsed = JSON.parse(response);
    $(".tracks-container").innerHTML = renderTracks(parsed.toptracks.track)
});

Another correction that I can suggest is to change the track.artist[0] to track.artist["name"] once this property returns an object instead of an array. And about this: <h3>${toptracks[1].rank}</h3> . You will be not able to access that property because at your function you are providing just the track property. In this case you have two options: provide the whole response array or add a new parameter providing this.

function renderTracks(trackArray) {/**...*/};
//...
$(".tracks-container").innerHTML = renderTracks(parsed.toptracks)

Or

function renderTracks(trackArray, toptracks) {/**...*/};
//...
$(".tracks-container").innerHTML = renderTracks(parsed.toptracks.track, parsed.toptracks)

I hope this can help you :)