我希望获取指定播放列表中的所有YouTube视频。 API目前允许您一次提取50条记录,但您可以通过传递下一页标记来提取下一组记录。
我还是Angular的新手,我无法完成这项任务。
以下是我目前的情况:
var app = angular.module('ph', []);
var key = '';
app.factory('youtubeService', ['$http', function ($http) {
function getPlaylists(channelId) {
return $.get("https://www.googleapis.com/youtube/v3/playlists", { part: 'snippet', channelId: channelId, key: key, maxResults: 50 });
}
function getPlaylistVideos(playlistId) {
var items = [];
var nextPageToken = "";
$.get('https://www.googleapis.com/youtube/v3/playlistItems', { part: 'snippet', maxResults: 50, playlistId: playlistId, key: key }).then(function (firstResponse) {
items = firstResponse.items;
var numberOfPages = Math.ceil(firstResponse.pageInfo.totalResults / 50);
for (var page = 1; page <= numberOfPages; page++) {
$.get('https://www.googleapis.com/youtube/v3/playlistItems', { part: 'snippet', maxResults: 50, pageToken: nextPageToken, playlistId: playlistId, key: key }).then(function(response) {
items = items.concat(response.items);
nextPageToken = response.nextPageToken;
});
}
});
return items;
}
function getVideos(keyword) {
return $.get('https://www.googleapis.com/youtube/v3/search', { part: 'snippet', q: keyword, key: key, type: 'video' });
}
return { getPlaylists: getPlaylists, getPlaylistVideos: getPlaylistVideos, getVideos: getVideos }
}]);
app.controller('ctrl', ['$http', '$scope', 'youtubeService', function ($http, $scope, youtubeService) {
youtubeService.getPlaylists('UC-9-kyTW8ZkZNDHQJ6FgpwQ').then(function (response) {
$scope.$apply(function () {
$scope.playlists = response.items;
});
});
$scope.getPlaylistVideos = function (selection) {
youtubeService.getPlaylistVideos(selection.id).then(function (response) {
$scope.$apply(function () {
$scope.playlistvideos = response.items;
});
});
}
$scope.getVideos = function (selection) {
youtubeService.getVideos(selection).then(function (response) {
$scope.$apply(function () {
$scope.videos = response.items;
});
});
}
}]);
我需要对getPlaylistVideos函数做什么才能让它返回播放列表中的所有视频?而不仅仅是50。
这是我之前返回第一页的代码:
function getPlaylistVideos(playlistId) {
return $.get('https://www.googleapis.com/youtube/v3/playlistItems', { part: 'snippet', maxResults: 50, playlistId: playlistId, key: key});
}
示例播放列表ID为PLFPg_IUxqnZNTAbUMEZ76_snWd-ED5en7。
非常感谢任何帮助!
$scope.getPlaylistVideos = function (selection) {
// pass the nextPageToken attribute to the getPlaylistVideos method.
youtubeService.getPlaylistVideos("PLFPg_IUxqnZNTAbUMEZ76_snWd-ED5en7", $scope.nextPageToken).then(function (response) {
$scope.$apply(function () {
angular.forEach(response.items, function (item) {
$scope.playlistvideos.push(item);
});
if (typeof response.nextPageToken != 'undefined') {
$scope.nextPageToken = response.nextPageToken;
// call the get playlist function again
$scope.getPlaylistVideos(selection);
}
});
});
}
答案 0 :(得分:2)
您需要使用pageToken
属性来获取下一页。
从文档中, 使用api响应中的nextPageToken属性。调用API一次或多次以检索API中的所有项目 名单。只要API响应返回nextPageToken, 还有更多要检索的项目。
在您的控制器中,定义一个局部变量nextPageToken
以检索下一页,并递归调用getPlaylistVideos
nextPageToken
属性,直到检索到所有结果。
app.controller('ctrl', ['$http', '$scope', 'youtubeService', function ($http, $scope, youtubeService) {
// define a local variable pageToken, it is gonna be undefined for the first time and will be initialized with next page token after subsequent responses
$scope.nextPageToken;
$scope.playlistVideos = [];
youtubeService.getPlaylists('UC-9-kyTW8ZkZNDHQJ6FgpwQ').then(function (response) {
$scope.$apply(function () {
$scope.playlists = response.items;
});
});
$scope.getPlaylistVideos = function (selection) {
// pass the nextPageToken attribute to the getPlaylistVideos method.
youtubeService.getPlaylistVideos(selection.id, $scope.nextPageToken).then(function (response) {
$scope.$apply(function () {
$scope.playlistVideos.push(response.items);
if(typeof response.nextPageToken != 'undefined'){
$scope.nextPageToken = response.nextPageToken;
// call the get playlist function again
$scope.getPlaylistVideos(selection);
}
});
});
}
$scope.getVideos = function (selection) {
youtubeService.getVideos(selection).then(function (response) {
$scope.$apply(function () {
$scope.videos = response.items;
});
});
}
}]);
在您的服务中,将pageToken
属性传递给api以获取下一页。
function getPlaylistVideos(playlistId, pageToken) {
...
// pass the page token as a parameter to the API
$.get('https://www.googleapis.com/youtube/v3/playlistItems', { part: 'snippet', maxResults: 50, playlistId: playlistId, key: key, pageToken: pageToken })
...
}