我是Angular 2的新手。
如果我有视频标签,例如:
<video width="480" height="480" autoplay></video>
以及用于打开相机流的javascript示例代码段:
var video = document.getElementById('video');
if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia({ video: true }).then(function(stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
});
}
在Angular 2 + Typescript中,我想我可以访问视频标签,如:
@Component({
selector: 'video-component',
template: `
<video #videoplayer autoplay></video>
`
})
export class Video {
@ViewChild('videoplayer') videoPlayer;
ngAfterViewInit() {
let video = document.getElementById('video');
// How to access the mediadevice ??
}
}
如何访问媒体设备并实例化流,如javascript片段中所示?
在您的模板中,您可以包含视频指令,如下所示:
<video #video width="640" height="480" autoplay></video>
然后在你的组件中:
@ViewChild('video') video:any;
// note that "#video" is the name of the template variable in the video element
ngAfterViewInit() {
let _video=this.video.nativeElement;
if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
navigator.mediaDevices.getUserMedia({ video: true })
.then(stream => {
_video.src = window.URL.createObjectURL(stream);
_video.play();
})
}
}
在stackblitz上看到这个:https://stackblitz.com/edit/live-video