can I access the device camera and take a photo in ReactJs? The goal is to create a component that allows the camera to take pictures with the click of a button. According to my studies, I should use mediaDevices, but I am looking for a sample code in ReactJs. Please provide me with a sample code, or if you have experience implementing this, please guide me.
I have prepared a sample code that can be used as a component. This code snippet is applicable to devices that also have two cameras. If you want to take a video instead of a photo, you can also enable the audio feature in the outputs.
import React from "react";
class App extends React.Component {
constructor() {
super();
this.cameraNumber = 0;
this.state = {
imageDataURL: null,
};
}
initializeMedia = async () => {
this.setState({ imageDataURL: null });
if (!("mediaDevices" in navigator)) {
navigator.mediaDevices = {};
}
if (!("getUserMedia" in navigator.mediaDevices)) {
navigator.mediaDevices.getUserMedia = function (constraints) {
var getUserMedia =
navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
if (!getUserMedia) {
return Promise.reject(new Error("getUserMedia Not Implemented"));
}
return new Promise((resolve, reject) => {
getUserMedia.call(navigator, constraints, resolve, reject);
});
};
}
//Get the details of video inputs of the device
const videoInputs = await this.getListOfVideoInputs();
//The device has a camera
if (videoInputs.length) {
navigator.mediaDevices
.getUserMedia({
video: {
deviceId: {
exact: videoInputs[this.cameraNumber].deviceId,
},
},
})
.then((stream) => {
this.player.srcObject = stream;
})
.catch((error) => {
console.error(error);
});
} else {
alert("The device does not have a camera");
}
};
capturePicture = () => {
var canvas = document.createElement("canvas");
canvas.width = this.player.videoWidth;
canvas.height = this.player.videoHeight;
var contex = canvas.getContext("2d");
contex.drawImage(this.player, 0, 0, canvas.width, canvas.height);
this.player.srcObject.getVideoTracks().forEach((track) => {
track.stop();
});
console.log(canvas.toDataURL());
this.setState({ imageDataURL: canvas.toDataURL() });
};
switchCamera = async () => {
const listOfVideoInputs = await this.getListOfVideoInputs();
// The device has more than one camera
if (listOfVideoInputs.length > 1) {
if (this.player.srcObject) {
this.player.srcObject.getVideoTracks().forEach((track) => {
track.stop();
});
}
// switch to second camera
if (this.cameraNumber === 0) {
this.cameraNumber = 1;
}
// switch to first camera
else if (this.cameraNumber === 1) {
this.cameraNumber = 0;
}
// Restart based on camera input
this.initializeMedia();
} else if (listOfVideoInputs.length === 1) {
alert("The device has only one camera");
} else {
alert("The device does not have a camera");
}
};
getListOfVideoInputs = async () => {
// Get the details of audio and video output of the device
const enumerateDevices = await navigator.mediaDevices.enumerateDevices();
//Filter video outputs (for devices with multiple cameras)
return enumerateDevices.filter((device) => device.kind === "videoinput");
};
render() {
const playerORImage = Boolean(this.state.imageDataURL) ? (
<img src={this.state.imageDataURL} alt="cameraPic" />
) : (
<video
ref={(refrence) => {
this.player = refrence;
}}
autoPlay
></video>
);
return (
<div className="App">
{playerORImage}
<button onClick={this.initializeMedia}>Take Photo</button>
<button onClick={this.capturePicture}>Capture</button>
<button onClick={this.switchCamera}>Switch</button>
</div>
);
}
}
export default App;
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With