How to open web cam in JavaScript ?
Last Updated :
18 Dec, 2023
In this article, we will see how to open a webcam and show a live video using JavaScript. For this, we are going to use Navigator Media Devices.
Navigator Media Devices
It is a read-only property that returns a Media Devices object, which helps us to access the connected media input devices like the camera and microphone.
Syntax:
let mediaDevices = navigator.mediaDevices;
Return value:
The singleton object MediaDevices. The members of this object are typically used directly, such as by executing navigator.mediaDevices.getUserMedia().
Example: In this example, we will use a navigator.mediaDevices to open a webcam.
HTML
<!DOCTYPE html>
< html lang = "en" >
< head >
< meta charset = "UTF-8" >
< meta name = "viewport"
content = "width=device-width, initial-scale=1.0" >
< title >Document</ title >
< style >
div {
width: 500px;
height: 400px;
border: 2px solid black;
position: relative;
}
video {
width: 500px;
height: 400px;
object-fit: cover;
}
</ style >
</ head >
< body >
< div >
< video id = "vid" ></ video >
</ div >
< br />
< button id = "but" autoplay>
Open WebCam
</ button >
</ body >
< script >
document.addEventListener("DOMContentLoaded", () => {
let but = document.getElementById("but");
let video = document.getElementById("vid");
let mediaDevices = navigator.mediaDevices;
vid.muted = true;
but.addEventListener("click", () => {
// Accessing the user camera and video.
mediaDevices
.getUserMedia({
video: true,
audio: true,
})
.then((stream) => {
// Changing the source of video to current stream.
video.srcObject = stream;
video.addEventListener("loadedmetadata", () => {
video.play();
});
})
.catch(alert);
});
});
</ script >
</ html >
|
Output :
How to open a web cam in JavaScript?
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