获得viewCount播放列表项，结合HTTP请求youtube v3 + JQuery

Question

我有点抓狂了:一件看似简单的事情我都做不好。我使用yt api v3从频道获取特定播放列表的视频。现在我使用两个HTTP请求(channels和playlistItems):

1. 获取给定用户名(channels/contentDetails)的所有上传的播放列表id
2. 从html-tag
中的data属性获取特定的播放列表id
3. 使用id获取每个播放列表(playlisttitems/snippet)的视频信息
4. 输出视频信息，附加到列表

下面的代码可以运行:

HTML

<h2><span>List 1</h2>
<ul data-plist="PLquImyRfMt6dWNzlyTHW9m353VadxKKg_"></ul>
<h2>List 2</h2>
<ul data-plist="PLquImyRfMt6d4gk6zX8FPEZeyYgE4oBdR"></ul>
<h2>List 3</h2>
<ul data-plist="PLquImyRfMt6fnpIb9VR9c6VLZwYs_OyWL"></ul>

JS/JQUERY:

var channelName = 'goetheinstitut';
var vidResults = 3;

// Get all Videos from the channel via Playlist "uploads"
$.get(
    "https://www.googleapis.com/youtube/v3/channels", {
    part: 'contentDetails',
    forUsername: channelName,
    key: 'AIzaSyCu8N1RGBaExofEQtBZHMMpAYNxvirhIBM'
},
function (data) {
    $.each(data.items, function (i, item) {
        pid = item.contentDetails.relatedPlaylists.uploads;
        getVids(pid);
    });
});
// Get videos for specific Playlist, id from data attr
function getVids(pid) {
    $("[data-plist]").each(function () {
        var vidPlaylist = $(this).data('plist');
        var mylist = $(this);
        // Get and output Playlist Items
        $.get(
            "https://www.googleapis.com/youtube/v3/playlistItems", {
            part: 'snippet',
            maxResults: vidResults,
            playlistId: vidPlaylist,
            key: 'AIzaSyCu8N1RGBaExofEQtBZHMMpAYNxvirhIBM'
        },
        function (data) {
            var output;
            $.each(data.items, function (i, item) {
                videoTitle = item.snippet.title.substring(8);
                videoId = item.snippet.resourceId.videoId;
                output = '<li><a href="//www.youtube.com/embed/' + videoId + '?autoplay=1&showinfo=0&controls=0"><h3>' + videoTitle + '</h3><small>viewCount</small></a></li>';
                //Append to results list                            
                $(mylist).append(output);
                });
            });
        });
    }

现在我还需要每个视频的viewCount。这意味着我必须将每个播放列表的videoid存储在一个数组中，然后为statistics.viewCount发出新的请求(https://www.googleapis.com/youtube/v3/videos)。但我现有的代码没法处理。

下面是对viewCount的请求，其中包含一个手动输入的id数组:

$.get(
    "https://www.googleapis.com/youtube/v3/videos", {
    part: 'statistics',
    // 3 ids from List 1 - these would have to come as variable
    id: '8kFevX-bp8g, L6thExvypGg, D_RBv6Bsm6E',
    key: 'AIzaSyCu8N1RGBaExofEQtBZHMMpAYNxvirhIBM'
},
function (data) {
    var listviews;
    $.each(data.items, function (i, item) {
        views = item.statistics.viewCount;
        listviews = '<li>'+views+'</li>';
        $('#results').append(listviews);
        // should be part of the output from the previous function...           
    });
});

谁能帮我把这两个请求连在一起?我总是得到一些未定义的变量，因为我超出了作用域。(

Answer 1

我可能没有正确理解你的要求。

但是，这段代码呢?

var channelName = 'goetheinstitut';
var vidResults = 3;
$.get(
    "https://www.googleapis.com/youtube/v3/channels", {
    part: 'contentDetails',
    forUsername: channelName,
    key: 'AIzaSyCu8N1RGBaExofEQtBZHMMpAYNxvirhIBM'
},
function (data) {
    $.each(data.items, function (i, item) {
        var pid = item.contentDetails.relatedPlaylists.uploads;
        getVids(pid);
    });
});
function getVids(pid) {
    $("[data-plist]").each(function () {
        var vidPlaylist = $(this).data('plist');
        var mylist = $(this);
        $.get(
            "https://www.googleapis.com/youtube/v3/playlistItems", {
            part: 'snippet',
            maxResults: vidResults,
            playlistId: vidPlaylist,
            key: 'AIzaSyCu8N1RGBaExofEQtBZHMMpAYNxvirhIBM'
        },
        function (data) {
            $.each(data.items, function (i, item) {
                var videoTitle = item.snippet.title.substring(8);
                var videoId = item.snippet.resourceId.videoId;
                $.get(
                    "https://www.googleapis.com/youtube/v3/videos", {
                    part: 'statistics',
                    id: videoId,
                    key: 'AIzaSyCu8N1RGBaExofEQtBZHMMpAYNxvirhIBM'
                },
                function (data) {
                    $.each(data.items, function (i, item) {
                        var views = item.statistics.viewCount;
                        var output = '<li><a href="//www.youtube.com/embed/' + videoId + '?autoplay=1&showinfo=0&controls=0"><h3>' + videoTitle + '</h3><small>' + views + '</small></a></li>';
                        $(mylist).append(output);
                    });
                });
            });
        });
    });
}