Elastic Toggle

HTML

CSS

JS

:root {
  --bg: #06070a;
  --surface: #0d0e15;
  --border: rgba(255, 255, 255, 0.04);
  --accent: #a855f7;
}
body {
  margin: 0;
  background-color: var(--bg);
  color: #f8fafc;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  user-select: none;
  -webkit-user-select: none;
  padding: 20px;
  box-sizing: border-box;
}
.control-card {
  width: 100%;
  max-width: 320px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  box-sizing: border-box;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
}
.label-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.2px;
}
.sub {
  font-size: 12px;
  color: #4b526d;
  font-weight: 500;
}
.switch-box {
  position: relative;
  width: 70px;
  height: 38px;
  cursor: pointer;
  border-radius: 100px;
}
canvas {
  display: block;
  width: 100%;
  height: 100%;
}

const trigger = document.getElementById('toggle-trigger');
const canvas = document.getElementById('switch-canvas');
const ctx = canvas.getContext('2d');
const statusTxt = document.getElementById('status-txt');
let isOn = false;
let knobX = 19;
let targetX = 19;
let knobWidth = 30;
let targetWidth = 30;
let vx = 0;
let wvx = 0;
function initBounds() {
  canvas.width = trigger.clientWidth;
  canvas.height = trigger.clientHeight;
}
function updatePhysics() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
  const h = canvas.height;
  const w = canvas.width;
  ctx.fillStyle = isOn ? 'rgba(168, 85, 247, 0.15)' : '#141622';
  ctx.strokeStyle = isOn ? 'rgba(168, 85, 247, 0.4)' : 'rgba(255,255,255,0.02)';
  ctx.lineWidth = 1;
  ctx.beginPath();
  ctx.roundRect(0, 0, w, h, 100);
  ctx.fill();
  ctx.stroke();
  let ax = (targetX - knobX) * 0.22;
  vx += ax;
  vx *= 0.72;
  knobX += vx;
  targetWidth = 30 + Math.abs(vx) * 0.8;
  let aw = (targetWidth - knobWidth) * 0.25;
  wvx += aw;
  wvx *= 0.7;
  knobWidth += wvx;
  ctx.fillStyle = isOn ? '#a855f7' : '#393e59';
  ctx.beginPath();
  ctx.roundRect(knobX - knobWidth / 2, h / 2 - 15, knobWidth, 30, 100);
  ctx.fill();
  requestAnimationFrame(updatePhysics);
}
function toggle() {
  isOn = !isOn;
  targetX = isOn ? (canvas.width - 19) : 19;
  statusTxt.textContent = isOn ? "Status // Active" : "Status // Disabled";
  statusTxt.style.color = isOn ? "#a855f7" : "#4b526d";
}
trigger.addEventListener('click', toggle);
window.addEventListener('resize', initBounds);
initBounds();
updatePhysics();

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