问题
I'm having a problem with retrieving related videos as thumbnails towards a specific video. In my code, I have the search->list set up correctly and returns the different titles and thumbnail URLs for the related videos. However, since search->list doesn't have parameter contentDetails or statistics, I found another question related to my exact same problem here and used a secondary call for getting videos->list since it supports those parameters to be able to retrieve the duration and view count. But the problem is that both values (vidDuration & viewCount) are not being passed anything and marked as undefined as the item is passed through it and halted. How can I make the item's duration and viewCount values based on search->list's item?
script.js:
function relatedVids(videoId)
{
debugger;
$.get( // get related videos related to videoId - relatedToVideoId
"https://www.googleapis.com/youtube/v3/search",
{
part: 'snippet',
maxResults: vidResults,
relatedToVideoId: videoId, // $.cookie("id"); from single-video.html
type: 'video',
key: 'XXXXXXXXX'
},
function(data)
{
$.each(data.items,
function(i, item)
{
console.log(item);
var vidTitle = item.snippet.title; // video title
//var videoId = item.snippet.resourceId.videoId; // video id
//var vidDuration = item.contentDetails.duration;
//var viewCount = item.statistics.viewCount;
var vidThumbUrl = item.snippet.thumbnails.default.url; // video thumbnail url
var extractVideoId = null; // var to extract video id string from vidThumbUrl
// check if vidThumbUrl is not null, empty string, or undefined
if(vidThumbUrl)
{
//console.log("vidThumbUrl: ", vidThumbUrl);
var split = vidThumbUrl.split("/"); // split string when '/' seen
extractVideoId = split[4]; // retrieve the fourth index on the fourth '/'
//console.log("extractVideoId: ", extractVideoId); // YE7VzlLtp-4
//console.log("split array: ", split);
}
else console.error("vidThumbUrl is either undefined or null or empty string.");
// if video title is longer than 25 characters, insert the three-dotted ellipse
if(vidTitle.length > 25)
{
var strNewVidTitle = vidTitle.substr(0, 25) + "...";
vidTitle = strNewVidTitle;
}
// search->list only takes snippet, so to get duration and view count; have to call this function that has the recognized param structure
$.get(
"https://www.googleapis.com/youtube/v3/videos",
{
part: 'contentDetails, statistics',
id: extractVideoId, //item.snippet.resourceId.videoId,
key: 'XXXXXXXXX',
},
// return search->list item's duration and view count
function(item)
{
vidDuration = item.contentDetails.duration; // pass item's duration
return vidDuration;
},
function(item)
{
viewCount = item.statistics.viewCount; // pass item's view count
return viewCount;
}
);
try
{
var vidThumbnail = '<div class="video-thumbnail"><a class="thumb-link" href="single-video.html"><div class="video-overlay"><img src="imgs/video-play-button.png"/></div><img src="' + vidThumbUrl + '" alt="No Image Available." style="width:204px;height:128px"/></a><p><a class="thumb-link" href="single-video.html">' + vidTitle + '</a><br/>' + convert_time(vidDuration) + ' / Views: ' + viewCount + '</p></div>';
// print results
$('.thumb-related').append(vidThumbnail);
}
catch(err)
{
console.error(err.message); // log error but continue operation
}
}
);
}
);
}
single-video.html script:
$(document).ready(function()
{
var videoId;
$(function()
{
if($.cookie("title") != null && $.cookie("id") != null)
{
var data = '<div class="video"><iframe height="' + vidHeight + '" width="' + vidWidth + '" src=\"//www.youtube.com/embed/' + $.cookie("id") + '\"></iframe></div><div class="title">' + $.cookie("title") + '</div><div class="desc">' + $.cookie("desc") + '</div><div class="duration">Length: ' + $.cookie("dur") + '</div><div class="stats">View Count: ' + $.cookie("views") + '</div>';
$("#video-display").html(data);
$("#tab1").html($.cookie("desc"));
videoId = $.cookie("id");
//vidDuration = $.cookie("dur"); works but prints out the same value for each
//viewCount = $.cookie("views"); works but prints out the same value for each
debugger;
relatedVids(videoId); // called here
console.log("from single-vid.html globalPlaylistId: ", $.cookie("playlistId"));
// remove cookies after transferring it to this page for display
$.removeCookie("title");
$.removeCookie("id");
$.removeCookie("desc");
$.removeCookie("views");
$.removeCookie("dur");
$.removeCookie("tags");
$.removeCookie("playlistId");
}
});
});
回答1:
You're referring the item in the search results.
When you issued a get request to videos, you will get a response of video contentDetails and statistics. Apparently, you didn't capture the returned response.
$.get(
"https://www.googleapis.com/youtube/v3/videos",
{
part: 'contentDetails, statistics',
id: videoId, //item.snippet.resourceId.videoId,
key: 'XXXXXXXXX',
},
function(videoItem)
{
vidDuration = videoItem.contentDetails.duration; // pass item's duration
viewCount = videoItem.statistics.viewCount; // pass item's view count
}
);
NOTE: You can pass a string of video IDs delimited by a comma to fetch multiple video contentDetails/statistics in one request.
来源：https://stackoverflow.com/questions/36314874/related-videos-with-part-contentdetails-and-statistics-youtube-api-v3