html 视频 javascript 播放方法在移动 Safari 中不起作用
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html video javascript play method not working in mobile Safari
提问by Robert Carter Mills
I have a video element in my ember.js app that I'm setting the srcof with window.URL.createObjectURL(file)to generate a preview before uploading. After capturing from a video file input, the rendered html looks like this:
我在我的ember.js应用程序的视频元素我设置src与window.URL.createObjectURL(file)生成上传前的预览。从视频文件输入捕获后，呈现的 html 如下所示：
<video class="video-review" controls="1" autoplay="1"
src="blob:http://66efcd0.ngrok.com/bb427ce0-af04-4763-bb59-3be85b936895">
</video>
// * ngrok is just a port forwarding util for testing
The video shows up fine, and plays fine if I manually tap on it.
视频显示正常，如果我手动点击它，它也能正常播放。
I need the video to play immediately after it has loaded. The problem is that autoplay does not work, and I can not get the video to play from javascript.In the console (after video has loaded vid.load()) I tried:
我需要视频在加载后立即播放。问题是自动播放不起作用，我无法从 javascript 播放视频。在控制台中（加载视频后vid.load()）我试过：
vid = $('video.video-review').get(0)
vid.play()
This does not work. However, if I manually tap on the video and play it, (and give it focus) then calling vid.play()from the console DOES work and plays the video fine. So I tried giving the video focus:
这不起作用。但是，如果我手动点击视频并播放它（并给它焦点），那么vid.play()从控制台调用确实可以正常播放视频。所以我试着给视频焦点：
vid.focus() and jquery $(vid).focus()
vid.play()
No luck.
没有运气。
How can I get an HTML video to play with javascript in mobile Safari?? - and why is autoplay not working?
如何在移动 Safari 中使用 javascript 播放 HTML 视频？- 为什么自动播放不起作用？
Also here is the code that assigns the video attributes (triggered by an observer on the file change event):
这里也是分配视频属性的代码（由文件更改事件的观察者触发）：
var file = this.get('file');
window.URL = window.URL || window.webkitURL;
var vid = this.$('.video-review').get(0);
vid.src = window.URL.createObjectURL(file);
vid.file = file;
vid.addEventListener('canplaythrough', function() {
this.play();
}, false);
vid.load();
采纳答案by aldel
You can't. Calling play on the video only works if it's in response to a user action, like in a click event handler. This is by design.
你不能。只有在响应用户操作（例如在单击事件处理程序中）时，才能调用视频播放。这是设计使然。
