Confetti Animation in CSS on Button Click

Confetti Animation in CSS on Button Click
Code Snippet:Confetti Button
Author: Cooper Goeke
Published: January 21, 2024
Last Updated: January 22, 2024
Downloads: 1,889
License: MIT
Edit Code online: View on CodePen
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This JavaScript code snippet helps you to create an interactive button with a confetti animation. When you click the button, it goes through various stages: loading, completion, and a burst of colorful confetti and sequins. This code adds a fun and engaging visual effect to your website or application when users click the button.

The design of the button element improves user experience, increases user interaction, and is a fun way to acknowledge completed actions. You can use this code in websites, or interactive landing pages to enhance user engagement and create a playful interaction.

How to Create Confetti Animation In CSS On Button Click

1. First, load the Reset CSS by adding the following CDN link into the head tag of your HTML document. (Optional)

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css">

2. Create the HTML structure for your button and canvas where the confetti animation will be displayed. Place the following code in your HTML file:

<button id="button" class="ready" onclick="clickButton();">
  
  <div class="message submitMessage">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 13 12.2">
      <polyline stroke="currentColor" points="2,7.1 6.5,11.1 11,7.1 "/>
      <line stroke="currentColor" x1="6.5" y1="1.2" x2="6.5" y2="10.3"/>
    </svg> <span class="button-text">Submit</span>
  </div>
  
  <div class="message loadingMessage">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 19 17">
      <circle class="loadingCircle" cx="2.2" cy="10" r="1.6"/>
      <circle class="loadingCircle" cx="9.5" cy="10" r="1.6"/>
      <circle class="loadingCircle" cx="16.8" cy="10" r="1.6"/>
    </svg>
  </div>
  
  <div class="message successMessage">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 13 11">
      <polyline stroke="currentColor" points="1.4,5.8 5.1,9.5 11.6,2.1 "/>
    </svg> <span class="button-text">Success</span>
  </div>
</button>
<canvas id="canvas"></canvas>

3. Include the CSS styles to define the appearance and behavior of your button and confetti animation. You can customize the styles to match your website’s design. Here’s a snippet of the CSS code:

@keyframes loading {
  0% {
    cy: 10;
  }
  25% {
    cy: 3;
  }
  50% {
    cy: 10;
  }
}
body {
  -webkit-font-smoothing: antialiased;
  background-color: #f4f7ff;
}

canvas {
  width: 640px !important;
  height: 220px !important;
  position: absolute;
  top: 0;
  pointer-events: none;
  margin: auto;
  z-index: 2;
}

button {
  display: block;
  background: none;
  border: none;
  color: #f4f7ff;
  cursor: pointer;
  font-family: "Quicksand", sans-serif;
  font-size: 14px;
  font-weight: 500;
  height: 40px;
  outline: none;
  position: relative;
  overflow: hidden;
  padding: 0 10px;
  width: 190px;
  -webkit-tap-highlight-color: transparent;
  z-index: 1;
  margin: 20px auto;
}
button::before {
  background: #1f2335;
  border-radius: 50px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.4) inset;
  content: "";
  display: block;
  height: 100%;
  margin: 0 auto;
  position: relative;
  transition: width 0.2s cubic-bezier(0.39, 1.86, 0.64, 1) 0.3s;
  width: 100%;
}

button.ready .submitMessage svg {
  opacity: 1;
  top: 1px;
  transition: top 0.4s ease 600ms, opacity 0.3s linear 600ms;
}
button.ready .submitMessage .button-text span {
  top: 0;
  opacity: 1;
  transition: all 0.2s ease calc(var(--dr) + 600ms);
}

button.loading::before {
  transition: width 0.3s ease;
  width: 80%;
}
button.loading .loadingMessage {
  opacity: 1;
}
button.loading .loadingCircle {
  animation-duration: 1s;
  animation-iteration-count: infinite;
  animation-name: loading;
  cy: 10;
}

button.complete .submitMessage svg {
  top: -30px;
  transition: none;
}
button.complete .submitMessage .button-text span {
  top: -8px;
  transition: none;
}
button.complete .loadingMessage {
  top: 80px;
}
button.complete .successMessage .button-text span {
  left: 0;
  opacity: 1;
  transition: all 0.2s ease calc(var(--d) + 1000ms);
}
button.complete .successMessage svg {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.3s ease-in-out 1.4s;
}

.button-text span {
  opacity: 0;
  position: relative;
}

.message {
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
}

.message svg {
  display: inline-block;
  fill: none;
  margin-right: 5px;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.submitMessage .button-text span {
  top: 8px;
  transition: all 0.2s ease var(--d);
}
.submitMessage svg {
  color: #5c86ff;
  margin-left: -1px;
  opacity: 0;
  position: relative;
  top: 30px;
  transition: top 0.4s ease, opacity 0.3s linear;
  width: 14px;
}

.loadingMessage {
  opacity: 0;
  transition: opacity 0.3s linear 0.3s, top 0.4s cubic-bezier(0.22, 0, 0.41, -0.57);
}
.loadingMessage svg {
  fill: #5c86ff;
  margin: 0;
  width: 22px;
}

.successMessage .button-text span {
  left: 5px;
  transition: all 0.2s ease var(--dr);
}
.successMessage svg {
  color: #5cffa1;
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
  transition: stroke-dashoffset 0.3s ease-in-out;
  width: 14px;
}

.loadingCircle:nth-child(2) {
  animation-delay: 0.1s;
}

.loadingCircle:nth-child(3) {
  animation-delay: 0.2s;
}

/* Website Link */
.website-link {
  background: #f8faff;
  border-radius: 50px 0 0 50px;
  bottom: 30px;
  color: #324b77;
  cursor: pointer;
  font-family: "Montserrat", sans-serif;
  font-weight: 600;
  height: 34px;
  filter: drop-shadow(2px 3px 4px rgba(0, 0, 0, 0.1));
  padding: 0 20px 0 40px;
  position: fixed;
  right: 0;
  text-align: left;
  text-decoration: none;
}
.website-link__icon {
  left: -10px;
  position: absolute;
  top: -12px;
  width: 44px;
}
.website-link__name {
  display: block;
  font-size: 14px;
  line-height: 14px;
  margin: 5px 0 3px;
}
.website-link__last-name {
  color: #55bada;
}
.website-link__message {
  color: #8aa8c5;
  display: block;
  font-size: 7px;
  line-height: 7px;
}

4. Use JavaScript to handle button clicks and trigger the confetti animation. You’ll need to initialize the confetti and sequin objects, as well as define their physics and behavior. Insert the JavaScript code into your HTML file:

// ammount to add on each button press
const confettiCount = 20
const sequinCount = 10

// "physics" variables
const gravityConfetti = 0.3
const gravitySequins = 0.55
const dragConfetti = 0.075
const dragSequins = 0.02
const terminalVelocity = 3

// init other global elements
const button = document.getElementById('button')
var disabled = false
const canvas = document.getElementById('canvas')
const ctx = canvas.getContext('2d')
canvas.width = window.innerWidth
canvas.height = window.innerHeight
let cx = ctx.canvas.width / 2
let cy = ctx.canvas.height / 2

// add Confetto/Sequin objects to arrays to draw them
let confetti = []
let sequins = []

// colors, back side is darker for confetti flipping
const colors = [
  { front : '#7b5cff', back: '#6245e0' }, // Purple
  { front : '#b3c7ff', back: '#8fa5e5' }, // Light Blue
  { front : '#5c86ff', back: '#345dd1' }  // Darker Blue
]

// helper function to pick a random number within a range
randomRange = (min, max) => Math.random() * (max - min) + min

// helper function to get initial velocities for confetti
// this weighted spread helps the confetti look more realistic
initConfettoVelocity = (xRange, yRange) => {
  const x = randomRange(xRange[0], xRange[1])
  const range = yRange[1] - yRange[0] + 1
  let y = yRange[1] - Math.abs(randomRange(0, range) + randomRange(0, range) - range)
  if (y >= yRange[1] - 1) {
    // Occasional confetto goes higher than the max
    y += (Math.random() < .25) ? randomRange(1, 3) : 0
  }
  return {x: x, y: -y}
}

// Confetto Class
function Confetto() {
  this.randomModifier = randomRange(0, 99)
  this.color = colors[Math.floor(randomRange(0, colors.length))]
  this.dimensions = {
    x: randomRange(5, 9),
    y: randomRange(8, 15),
  }
  this.position = {
    x: randomRange(canvas.width/2 - button.offsetWidth/4, canvas.width/2 + button.offsetWidth/4),
    y: randomRange(canvas.height/2 + button.offsetHeight/2 + 8, canvas.height/2 + (1.5 * button.offsetHeight) - 8),
  }
  this.rotation = randomRange(0, 2 * Math.PI)
  this.scale = {
    x: 1,
    y: 1,
  }
  this.velocity = initConfettoVelocity([-9, 9], [6, 11])
}
Confetto.prototype.update = function() {
  // apply forces to velocity
  this.velocity.x -= this.velocity.x * dragConfetti
  this.velocity.y = Math.min(this.velocity.y + gravityConfetti, terminalVelocity)
  this.velocity.x += Math.random() > 0.5 ? Math.random() : -Math.random()
  
  // set position
  this.position.x += this.velocity.x
  this.position.y += this.velocity.y

  // spin confetto by scaling y and set the color, .09 just slows cosine frequency
  this.scale.y = Math.cos((this.position.y + this.randomModifier) * 0.09)    
}

// Sequin Class
function Sequin() {
  this.color = colors[Math.floor(randomRange(0, colors.length))].back,
  this.radius = randomRange(1, 2),
  this.position = {
    x: randomRange(canvas.width/2 - button.offsetWidth/3, canvas.width/2 + button.offsetWidth/3),
    y: randomRange(canvas.height/2 + button.offsetHeight/2 + 8, canvas.height/2 + (1.5 * button.offsetHeight) - 8),
  },
  this.velocity = {
    x: randomRange(-6, 6),
    y: randomRange(-8, -12)
  }
}
Sequin.prototype.update = function() {
  // apply forces to velocity
  this.velocity.x -= this.velocity.x * dragSequins
  this.velocity.y = this.velocity.y + gravitySequins
  
  // set position
  this.position.x += this.velocity.x
  this.position.y += this.velocity.y   
}

// add elements to arrays to be drawn
initBurst = () => {
  for (let i = 0; i < confettiCount; i++) {
    confetti.push(new Confetto())
  }
  for (let i = 0; i < sequinCount; i++) {
    sequins.push(new Sequin())
  }
}

// draws the elements on the canvas
render = () => {
  ctx.clearRect(0, 0, canvas.width, canvas.height)
  
  confetti.forEach((confetto, index) => {
    let width = (confetto.dimensions.x * confetto.scale.x)
    let height = (confetto.dimensions.y * confetto.scale.y)
    
    // move canvas to position and rotate
    ctx.translate(confetto.position.x, confetto.position.y)
    ctx.rotate(confetto.rotation)

    // update confetto "physics" values
    confetto.update()
    
    // get front or back fill color
    ctx.fillStyle = confetto.scale.y > 0 ? confetto.color.front : confetto.color.back
    
    // draw confetto
    ctx.fillRect(-width / 2, -height / 2, width, height)
    
    // reset transform matrix
    ctx.setTransform(1, 0, 0, 1, 0, 0)

    // clear rectangle where button cuts off
    if (confetto.velocity.y < 0) {
      ctx.clearRect(canvas.width/2 - button.offsetWidth/2, canvas.height/2 + button.offsetHeight/2, button.offsetWidth, button.offsetHeight)
    }
  })

  sequins.forEach((sequin, index) => {  
    // move canvas to position
    ctx.translate(sequin.position.x, sequin.position.y)
    
    // update sequin "physics" values
    sequin.update()
    
    // set the color
    ctx.fillStyle = sequin.color
    
    // draw sequin
    ctx.beginPath()
    ctx.arc(0, 0, sequin.radius, 0, 2 * Math.PI)
    ctx.fill()

    // reset transform matrix
    ctx.setTransform(1, 0, 0, 1, 0, 0)

    // clear rectangle where button cuts off
    if (sequin.velocity.y < 0) {
      ctx.clearRect(canvas.width/2 - button.offsetWidth/2, canvas.height/2 + button.offsetHeight/2, button.offsetWidth, button.offsetHeight)
    }
  })

  // remove confetti and sequins that fall off the screen
  // must be done in seperate loops to avoid noticeable flickering
  confetti.forEach((confetto, index) => {
    if (confetto.position.y >= canvas.height) confetti.splice(index, 1)
  })
  sequins.forEach((sequin, index) => {
    if (sequin.position.y >= canvas.height) sequins.splice(index, 1)
  })

  window.requestAnimationFrame(render)
}

// cycle through button states when clicked
clickButton = () => {
  if (!disabled) {
    disabled = true
    // Loading stage
    button.classList.add('loading')
    button.classList.remove('ready')
    setTimeout(() => {
      // Completed stage
      button.classList.add('complete')
      button.classList.remove('loading')
      setTimeout(() => {
        window.initBurst()
        setTimeout(() => {
          // Reset button so user can select it again
          disabled = false
          button.classList.add('ready')
          button.classList.remove('complete')
        }, 4000)
      }, 320)
    }, 1800)
  }
}

// re-init canvas if the window size changes
resizeCanvas = () => {
  canvas.width = window.innerWidth
  canvas.height = window.innerHeight
  cx = ctx.canvas.width / 2
  cy = ctx.canvas.height / 2
}

// resize listenter
window.addEventListener('resize', () => {
  resizeCanvas()
})

// click button on spacebar or return keypress
document.body.onkeyup = (e) => {
  if (e.keyCode == 13 || e.keyCode == 32) {
    clickButton()
  }
}

// Set up button text transition timings on page load
textElements = button.querySelectorAll('.button-text')
textElements.forEach((element) => {
  characters = element.innerText.split('')
  let characterHTML = ''
  characters.forEach((letter, index) => {
    characterHTML += `<span class="char${index}" style="--d:${index * 30}ms; --dr:${(characters.length - index - 1) * 30}ms;">${letter}</span>`
  })
  element.innerHTML = characterHTML
})

// kick off the render loop
window.initBurst()
render()

That’s all! hopefully, you have successfully created a Confetti Animation in CSS on Button Click. If you have any questions or suggestions, feel free to comment below.

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