我有一个问题是将YouTube视频嵌入到PhoneJS单页移动应用程序中。在PhoneJS中,JS脚本在不同的文件中定义。所以我像这样定义了HTML div:
<div id="player"></div>
现在在JS文件中,我这样做了:
function getVideo() {
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var playerDiv = document.getElementById('player');
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
var player;
function onYouTubeIframeAPIReady() {
player = new YT.Player(playerDiv, {
height: '250',
width: '444',
videoId: sIFYPQjYhv8
});
}
}
当我运行并查看调试器时,会调用Youtube并收到响应,但它不会显示在视图上。
好的,因为我使用KnockoutJS绑定,我修改了html视图中的div,如下所示:
<iframe id="player" type="text/html" width="444" height="250" frameborder="0" data-bind="attr: { src: src }"></iframe>
然后传入src视频ID:
src: ko.observable('http://www.youtube.com/embed/' + sIFYPQjYhv8 + '?autoplay=1')
但是在这种情况下,在调试器中,甚至没有对Youtube进行调用。什么都没发生。实际上我更喜欢使用API调用而不是第二种方法。
关于如何使第一种方法有效的任何建议?我的意思是使用API调用?
EDIT 只是想提一下,当我在视图中添加下面的代码时,视频流是正常的。
<h1>Video</h1>
<div id="player"></div>
<script>
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var playerDiv = document.getElementById('player');
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
var player;
function onYouTubeIframeAPIReady() {
player = new YT.Player(playerDiv, {
height: '250',
width: '444',
videoId: 'sIFYPQjYhv8'
});
}
</script>
答案 0 :(得分:1)
我认为最简单的方法是使用自定义绑定处理程序,并在onYouTubeIFrameAPIReady回调中设置标志
ko.bindingHandlers['player'] = {
init: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
// Check if global script and function is declared.
if ( !document.getElementById('playerScript') ) {
// Create script
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var playerDiv = document.getElementById('player');
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
// Create global function that their API calls back
window.playerReady = ko.observable(false);
window.onYouTubeIframeAPIReady = function() {
window.playerReady(true);
};
}
},
update: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
var value = valueAccessor(),
id = value.id(),
height = ko.unwrap(value.height) || '250',
width = ko.unwrap(value.width) || '444'
;
if ( !value.id()) {
return;
}
if ( !window.playerReady() ) {
// YT hasn't invoked global callback. Subscribe to update
var subscription;
subscription = window.playerReady.subscribe( function(newValue) {
if ( newValue ) {
subscription.dispose();
// Just get this binding to fire again
value.id.notifySubscribers(value.id());
}
});
} else {
var player = new YT.Player( element, {
height: height,
width: width,
videoId: id
});
}
},
}
现在将玩家div更改为
<div data-bind="player: { id: id, height: height, width: width }"></div>
最后绑定
var vm = {
id: 'sIFYPQjYhv8',
height: '250',
width: '444'
};
ko.applyBindings( vm )
修改强>
要删除对窗口的依赖,请将脚本标记添加回新的脚本元素,如下所示,修改其回调并使用setTimeout而不是“playerReady”observable
HTML脚本
var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
tag.setAttribute('id', 'playerScript');
tag.setAttribute('data-ready', 'false');
...
function onYouTubeIframeAPIReady = function() {
document.getElementById('playerScript').setAttribute('data-ready', 'true');
};
玩家绑定
update: function(element, valueAccessor, allBindings, viewModel, bindingContext) {
var value = valueAccessor(),
id = value.id(),
height = ko.unwrap(value.height) || '250',
width = ko.unwrap(value.width) || '444',
playerScript = document.getElementById('playerScript')
;
if ( !value.id()) {
return;
}
if ( !playerScript || playerScript.getAttribute('data-ready') !== 'true' ) ) {
// YT hasn't invoked global callback.
setTimeout( function() {
value.id.notifySubscribers(value.id());
}, 50);
} else {
var player = new YT.Player( element, {
height: height,
width: width,
videoId: id
});
}
}