javascript - 从数组内的数组项获取 json 项

Question

我有一个数组数组:

var json = {
    "music": {
        "albums": [{
            "name": "foo",
                "tracks": [{
                "name": "foo",
                    "ref": "1"
            }, {
                "name": "bar",
                    "ref": "2"
            }, {
                "name": "foobar",
                    "ref": "3"
            }]
        }, {
            "name": "bar",
                "tracks": [{
                "name": "f",
                    "ref": "1"
            }, {
                "name": "oo",
                    "ref": "2"
            }, {
                "name": "bar",
                    "ref": "3"
            }]
        }]
    }
};

如您所见，album是一个包含两个数组和一个 name 的数组属性(property)。相册中的数组称为 tracks ，其中包含 dom 上显示的专辑中的轨道。我想做的是用 jquery 修改 dom，如下所示:

var gridListMusic = $('#grid-listMusic');
var gridListMusicList = $('#grid-listMusic ul');

    function createAlbumSection(id) {
        gridListMusic.append('<div>' + id + '</div>');
        gridListMusic.append('<div class="grid-container">' + '<ul>' + '</ul>' + '</div');
        $.each(json.music.albums.tracks, function (index, value) {
            gridListMusicList.append('<li>' + value.name + '</li>');
        });
    }

    function jsonDo(data) {
        $.each(data.music.albums, function (index, value) {
            alert(value.name);
            if (typeof data.music.albums !== 'undefined') {
                createAlbumSection(value.name);
            }
        });
    }

这将像这样将 div 和 uls 插入到 DOM 中:

<div>foo</div>
<div class="grid-container">
  <ul>
    <li>foo</li>
    <li>bar</li>
    <li>foobar</li>
  </ul>
</div>

<div>bar</div>
<div class="grid-container">
  <ul>
    <li>f</li>
    <li>oo</li>
    <li>bar</li>
  </ul>
</div>

但是，当我尝试插入 tracks 时，我的控制台就会出现此错误。在 <ul> :

Uncaught TypeError: Cannot read property 'albums' of undefined

Answer 1

您应该重写您的 createAlbumSection 以接受轨道列表:

function createAlbumSection(id, tracks) {
    var html = '<div>' + id + '</div>' + '<div class="grid-container">' + '<ul>';

    $.each(tracks, function (index, value) {
        html += '<li>' + value.name + '</li>';
    });

    html += '</ul>' + '</div>';

    gridListMusic.append(html);
}

然后，将其与您的 jsonDo 一起发送:

function jsonDo(data) {
    $.each(data.music.albums, function (index, value) {
        alert(value.name);
        if (typeof data.music.albums !== 'undefined') {
            createAlbumSection(value.name, value.tracks);
        }
    });
}