问题描述
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// variables to be used throughout
var videos = new Array();
// similar artist/bands
function similarTo(who) {
$.getJSON(\'http://ws.audioscrobbler.com/2.0/?method=artist.getsimilar&artist=\'+who+\'&limit=20&api_key=b25b959554ed76058ac220b7b2e0a026&format=json&callback=?\',function(data) {
$.each(data,function(i,similars) {
$.each(similars.artist,function(c,artist) {
$.getJSON(\'http://gdata.youtube.com/feeds/api/videos?q=\'+artist.name+\'&orderby=relevance&start-index=1&max-results=1&v=2&alt=json-in-script&callback=?\',function(data) {
$.each(data.feed.entry,video) {
videos.push({
id: video.id.$t.split(\":\")[3],title: video.title.$t
});
});
});
});
initPlaylist();
});
});
}
// start the playlist
function initPlaylist() {
$(\'#ytplayerid\').load(\'includes/ytplayer.php?track=\' + videos[currenttrack].id);
$(\'#player span\').html(videos[currenttrack].title);
}
当我的代码到达initPlaylist()
函数时,视频数组似乎为空,我感觉在$.getJSON()
调用之前它实际上已被触发...这可能吗?如果我在每个“ 3”之后添加console.log(videos),则实际上是在构建数组。
解决方法
$.each(similars.artist,function(c,artist) {
// doing ajax stuff here
$.getJSON(\'url\',function(data) {
// this will get called later
$.each(data.feed.entry,function(i,video) {
videos.push({
id: video.id.$t.split(\":\")[3],title: video.title.$t
});
});
});
});
// trying to manipulate ajax data now :(
initPlaylist();
您的“ѭ5”是空的,因为您试图在未准备好之前对其进行操作。
您要做的是使用jQuery 1.5+延迟对象
var ajaxs = $.map(similars.artist,function(artist,c) {
return $.getJSON(\'url\',function(data) {
$.each(data.feed.entry,title: video.title.$t
});
});
});
});
// when all the ajaxs finish then call init play list
$.when.apply($,ajaxs).then(initPlaylist);
,将initPlaylist
移动到存在videos
的位置:
function similarTo(who) {
$.getJSON(\'http://ws.audioscrobbler.com/2.0/?method=artist.getsimilar&artist=\'+who+\'&limit=20&api_key=b25b959554ed76058ac220b7b2e0a026&format=json&callback=?\',function(data) {
$.each(data,similars) {
$.each(similars.artist,artist) {
$.getJSON(\'http://gdata.youtube.com/feeds/api/videos?q=\'+artist.name+\'&orderby=relevance&start-index=1&max-results=1&v=2&alt=json-in-script&callback=?\',function(data) {
var videoes = []; //create array
$.each(data.feed.entry,video) {
videos.push({
id: video.id.$t.split(\":\")[3],title: video.title.$t
});
});
initPlaylist();
//videos exists,but i think you might need to pass it as a parameter
});
});
});
});
}
虽然,知道ѭ10中的内容可能会有所帮助。它可能会解决您的代码中似乎是范围问题的问题。
还:Ajax是异步的,在代码到达initPlaylist();
时,它可能还没有完成,因此在完成所有ajax调用后,您需要某种类型的回调来调用initPlaylist();
。