Let's Begin
In this blog, you are going to learn how to create a screen recorder that does not only record your browser screen. Yes, it can record not only your active tab but the entire screen if you want. First of all, we will create an HTML file which contains a record button and a video element where you can play the recorded video.
<!DOCTYPE html>
<html>
<head>
<title>Screen Recorder/title>
<meta charset="UTF-8" />
</head>
<body>
<video class="video" width="600px" controls></video>
<button class="record-btn">record</button>
<script src="./index.js"></script>
</body>
</html>
And we also need a JavaScript file. Let's create a file and naeme it index.js.
NB: You can name your js file with any other name but make sure you reference the name well in the HTML file.
let btn = document.querySelector(".record-btn");
btn.addEventListener("click", function () {
console.log("hello");
});
In the JS file, type the above code into it. This should print the word hello
when you open your browser. Alright, now instead of console.log
, let us get the stream display
let btn = document.querySelector(".record-btn");
btn.addEventListener("click", async function () {
let stream = await navigator.mediaDevices.getDisplayMedia({
video: true
});
});
Now, after clicking the button, you'll see the screen below:
Now that we can select the way to record the video, let's now go into the main implementation, that is how to actually record the video. We will use MediaRecorder to record the video.
let btn = document.querySelector(".record-btn")
btn.addEventListener("click", async function () {
let stream = await navigator.mediaDevices.getDisplayMedia({
video: true
})
//needed for better browser support
const mime = MediaRecorder.isTypeSupported("video/webm; codecs=vp9")
? "video/webm; codecs=vp9"
: "video/webm"
let mediaRecorder = new MediaRecorder(stream, {
mimeType: mime
})
//we have to start the recorder manually
mediaRecorder.start()
})
While recording, we now need to store the data we got from mediaRecorder
in a variable.
let btn = document.querySelector(".record-btn")
btn.addEventListener("click", async function () {
let stream = await navigator.mediaDevices.getDisplayMedia({
video: true
})
//needed for better browser support
const mime = MediaRecorder.isTypeSupported("video/webm; codecs=vp9")
? "video/webm; codecs=vp9"
: "video/webm"
let mediaRecorder = new MediaRecorder(stream, {
mimeType: mime
})
let chunks = []
mediaRecorder.addEventListener('dataavailable', function(e) {
chunks.push(e.data)
})
//we have to start the recorder manually
mediaRecorder.start()
})
Let's add the code to make the video play in the video element after we are done recording
let btn = document.querySelector(".record-btn")
btn.addEventListener("click", async function () {
let stream = await navigator.mediaDevices.getDisplayMedia({
video: true
})
//needed for better browser support
const mime = MediaRecorder.isTypeSupported("video/webm; codecs=vp9")
? "video/webm; codecs=vp9"
: "video/webm"
let mediaRecorder = new MediaRecorder(stream, {
mimeType: mime
})
let chunks = []
mediaRecorder.addEventListener('dataavailable', function(e) {
chunks.push(e.data)
})
mediaRecorder.addEventListener('stop', function(){
let blob = new Blob(chunks, {
type: chunks[0].type
})
let video = document.querySelector(".video")
video.src = URL.createObjectURL(blob)
})
//we have to start the recorder manually
mediaRecorder.start()
})
Okay, we are almost done. Now let's add some finishing touches to make the video video download itself automatically after recording has been stopped.
let btn = document.querySelector(".record-btn")
btn.addEventListener("click", async function () {
let stream = await navigator.mediaDevices.getDisplayMedia({
video: true
})
//needed for better browser support
const mime = MediaRecorder.isTypeSupported("video/webm; codecs=vp9")
? "video/webm; codecs=vp9"
: "video/webm"
let mediaRecorder = new MediaRecorder(stream, {
mimeType: mime
})
let chunks = []
mediaRecorder.addEventListener('dataavailable', function(e) {
chunks.push(e.data)
})
mediaRecorder.addEventListener('stop', function(){
let blob = new Blob(chunks, {
type: chunks[0].type
})
let url = URL.createObjectURL(blob)
let video = document.querySelector("video")
video.src = url
let a = document.createElement('a')
a.href = url
a.download = 'video.webm'
a.click()
})
//we have to start the recorder manually
mediaRecorder.start()
})
We are finally done, Hope it worked for you.
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