We are going to build a lucky draw spinning wheel, that lets you spin a wheel when a button is clicked.Spin to win wheels can be an excellent way to engage your customers. Whether you’re trying to reduce shopping cart abandonment, capture new leads, or improve user experience (UX), spin to win wheels add excitement to your popups.
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| How to Create a Simple Lucky Draw Spinning Wheel in website? |
styles
<script src="https://unpkg.com/sweetalert/dist/sweetalert.min.js"></script>
<head>
<style type="text/css">
#wheelOfFortune {
display: inline-block;
position: relative;
overflow: hidden;
}
#wheel {
display: block;
}
#spin {
font: 1.5em/0 sans-serif;
user-select: none;
cursor: pointer;
display: flex;
justify-content: center;
align-items: center;
position: absolute;
top: 50%;
left: 50%;
width: 30%;
height: 30%;
margin: -15%;
background: #fff;
color: #fff;
box-shadow: 0 0 0 8px currentColor, 0 0px 15px 5px rgba(0, 0, 0, 0.6);
border-radius: 50%;
transition: 0.8s;
}
#spin::after {
content: "";
position: absolute;
top: -17px;
border: 10px solid transparent;
border-bottom-color: currentColor;
border-top: none;
}
</style>
Html
<div id="wheelOfFortune">
<canvas id="wheel" width="300" height="300"></canvas>
<div id="spin">SPIN</div>
</div>
Script
<script type="text/javascript">
const sectors = [
{color:"#f82", label:"Stack"},
{color:"#0bf", label:"10"},
{color:"#fb0", label:"200"},
{color:"#0fb", label:"50"},
{color:"#b0f", label:"100"},
{color:"#f0b", label:"5"},
];
const rand = (m, M) => Math.random() * (M - m) + m;
const tot = sectors.length;
const EL_spin = document.querySelector("#spin");
const ctx = document.querySelector("#wheel").getContext('2d');
const dia = ctx.canvas.width;
const rad = dia / 2;
const PI = Math.PI;
const TAU = 2 * PI;
const arc = TAU / sectors.length;
const friction = 0.991; // 0.995=soft, 0.99=mid, 0.98=hard
let angVel = 0; // Angular velocity
let ang = 0; // Angle in radians
const getIndex = () => Math.floor(tot - ang / TAU * tot) % tot;
function drawSector(sector, i) {
const ang = arc * i;
ctx.save();
// COLOR
ctx.beginPath();
ctx.fillStyle = sector.color;
ctx.moveTo(rad, rad);
ctx.arc(rad, rad, rad, ang, ang + arc);
ctx.lineTo(rad, rad);
ctx.fill();
// TEXT
ctx.translate(rad, rad);
ctx.rotate(ang + arc / 2);
ctx.textAlign = "right";
ctx.fillStyle = "#fff";
ctx.font = "bold 30px sans-serif";
ctx.fillText(sector.label, rad - 10, 10);
//
ctx.restore();
};
function rotate() {
const sector = sectors[getIndex()];
ctx.canvas.style.transform = `rotate(${ang - PI / 2}rad)`;
EL_spin.textContent = !angVel ? "SPIN" : sector.label;
EL_spin.style.background = sector.color;
}
function finishedSpinning() { // Called when the wheel stops spinning
const sector = sectors[getIndex()];
// alert('----------'+sector.label);
// alert("You have won " + sector.label);
swal(
"Congratulations",
"You Won The " + sector.label + ".",
"success"
);
}
function frame() {
if (!angVel) return;
const isSpinning = angVel > 0; // Check if the wheel is currently spinning
angVel *= friction; // Decrement velocity by friction
if (angVel < 0.002) angVel = 0; // Bring to stop
ang += angVel; // Update angle
ang %= TAU; // Normalize angle
rotate();
if (isSpinning && angVel === 0) { // If the wheel was spinning, but isn't anymore, it has just stopped
finishedSpinning();
}
}
function engine() {
frame();
requestAnimationFrame(engine)
}
// INIT
sectors.forEach(drawSector);
rotate(); // Initial rotation
engine(); // Start engine
EL_spin.addEventListener("click", () => {
if (!angVel) angVel = rand(0.25, 0.35);
});
</script>