How to create a snowfall with Javascript

December 13, 2021 / CSS, HTML Tutorials, JavaScript, Tricks and Tips / animations, christmas, css, javascript

Hello people! It’s Christmas time! So let’s create a snowfall effect with JavaScript. It’s only pure JavaScript. No jQuery or other libraries. Just plain JavaScript. So let’s create snowfall with Javascript.

Step 1

Open your favourite code editor.

And now create an HTML file with the following code:

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>My Snowfall</title>
    </head>
    <body>
        <script>
            // our hero code
        </script>
    </body>
</html>

And we’ll make the background darker.

<style>
    body {
        background: #1d1d1d;
    }
</style>

Now let’s start with JavaScript.

Step 2

Let’s create a function named addSnow.

let addSnow = () => {
    // code goes here
};

Then inside the function, we put these variables:

const random = (min, max) => Math.random() * (max - min) + min;
let screenWidth = window.innerWidth;
let screenHeight = window.innerHeight;

Now we’ll create a div.

let snow = document.createElement('div');

Then we’ll add some styles to the div.

snow.style.position = "fixed";
snow.style.top = "-2px";
snow.style.right = random(0, screenWidth) + "px";
snow.style.width = "10px";
snow.style.height = "10px";
snow.style.backgroundColor = "#fff";
snow.style.borderRadius = "50%";
snow.style.zIndex = "999";
snow.style.pointerEvents = "none";

These styles will create something like this (Smaller):

After that animate the div.

const animateSnow = () => {
    snow.style.top = parseInt(snow.style.top) + 2 + "px";
    snow.style.right = parseInt(snow.style.right) + random(0, 2) + "px";
    /**
     * If it's out of the screen, move it to the top
     * and randomize it's position
     * */
    if (parseInt(snow.style.top) > screenHeight) {
        snow.style.right = random(0, screenWidth) + "px";
        snow.style.top = parseInt("-" + random(0, 20) + "px");
    }
    window.requestAnimationFrame(animateSnow);
};
window.requestAnimationFrame(animateSnow);

And finally, we’ll add the div to the body.

document.body.appendChild(snow);

Ah, don’t forget to close the function.

};

And to add the snow we’ll just call the function 60 times.

for (let i = 0; i < 60; i++) {
    setTimeout(addSnow, i * 100);
}

And that’s it! Here’s the result:

Conclusion

Here's a minified version of the code:

let  t=()=>{const  t=(t,e)=>Math.random()*(e-t)+t;let  e=window.innerWidth,n=window.innerHeight,s=document.createElement("div");s.style.position="fixed",s.style.top="-2px",s.style.right=t(0,e)+"px",s.style.width="10px",s.style.height="10px",s.style.backgroundColor="#fff",s.style.borderRadius="50%",s.style.zIndex="999",s.style.style.pointerEvents='none';const  i=()=>{s.style.top=parseInt(s.style.top)+2+"px",s.style.right=parseInt(s.style.right)+t(0,2)+"px",parseInt(s.style.top)>n&&(s.style.right=t(0,e)+"px",s.style.top=parseInt("-"+t(0,20)+"px")),window.requestAnimationFrame(i)};window.requestAnimationFrame(i),document.body.appendChild(s)};for(let  e=0;e<60;e++)setTimeout(t,100*e);

You can add this to your website and you'll get a snowfall effect. Have fun! 🙂

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