How to get a youtube playlist using javascript API and json
This is part of my youtube project. I try to extract video information from JSON format but I have problem in this line:
var videoId = data.feed.entry[i].link[1].href;
When I do this in single line not in cikle evrithing is ok but in cikle for or while I have error.
//get youtube ID
function extract(url){
pos1=url.indexOf("videos/");
pos2=url.substr(42,11);
return pos2;
}
//My playlist LINK
var url2="http://gdata.youtube.com/feeds/api/playlists/B2A4E1367126848D?v=2&alt=json";
function playlistinfo(url1) {
$.ajax({
url: url1,
dataType: "jsonp",
success: function (data) { parseresults(data); }
});
}
//whit this get playlist data
function parseresults(data) {
//return playlist clip number
var klipove= data.feed.openSearch$totalResults.$t;
//put clips in <li>
for(i=0;i<=klipove-1;i++) {
var videoId = data.feed.entry[i].link[1].href;
//get video id ID
var id= extract(videoId);
thumb = data.feed.entry[i].media$group.media$thumbnail[0].url;
$('<li><img src="'+thumb+'" alt="'+id+'" class="thumb"/></li>').appendTo('.cont');
}
}
IMHO, you code can be much shortened if you use $.getJSON , $.each
Try this.
var playListURL = 'http://gdata.youtube.com/feeds/api/playlists/B2A4E1367126848D?v=2&alt=json&callback=?';
var videoURL= 'http://www.youtube.com/watch?v=';
$.getJSON(playListURL, function(data) {
var list_data="";
$.each(data.feed.entry, function(i, item) {
var feedTitle = item.title.$t;
var feedURL = item.link[1].href;
var fragments = feedURL.split("/");
var videoID = fragments[fragments.length - 2];
var url = videoURL + videoID;
var thumb = "http://img.youtube.com/vi/"+ videoID +"/default.jpg";
if (videoID !='videos') {
list_data += '<li><a href="'+ url +'" title="'+ feedTitle +'"><img alt="'+ feedTitle+'" src="'+ thumb +'"</a></li>';
}
});
$(list_data).appendTo(".cont");
});
Demo: Fiddle for the playlist you have provided
PS: Keep in mind that thumbnail for a youtube video could be found at
http://img.youtube.com/vi/{video-id}/default.jpg
( More Info here )
I found that these lines:
var feedURL = item.link[1].href;
var fragments = feedURL.split("/");
var videoID = fragments[fragments.length - 2];
are expecting item.link[1].href to be in this format:
http://gdata.youtube.com/feeds/api/videos/NAs5it-xjnQ/responses?v=2
However, it does not necessarily work as sometimes item.link[1] gives an URL like
http://www.youtube.com/watch?v=Vcp7xz6dfWE&feature=youtube_gdata
Fragments[fragments.length - 2] will end up being "www.youtube.com" instead of the video ID.
I modified it to retrieve the link from item.content.src which always has a fixed format in the URL eg
http://www.youtube.com/v/NAs5it-xjnQ?version=3&f=playlists&app=youtube_gdata
So the final code snippet is something like:
var tmp = item.content.src.split("/").reverse()[0];
var videoID = tmp.substring(0, tmp.indexOf("?"));
which so far has not failed me yet.
Hope this helps those who are stuck or is having problems retrieving the video ID.
Regards
CK
简化解决方案并摆脱字符串操作的东西。
var playListURL = 'http://gdata.youtube.com/feeds/api/playlists/B2A4E1367126848D?v=2&alt=json&callback=?';
var videoURL= 'http://www.youtube.com/watch?v=';
var vids = new Array();
$.getJSON(playListURL, function(data) {
$.each(data.feed.entry, function(i, item) {
vids.push( item["media$group"]["yt$videoid"]["$t"] );
});
console.log( vids );
});