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index.js
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index.js
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const progress = document.getElementById('progress')
const prev = document.getElementById('prev')
const next = document.getElementById('next')
const circles = document.querySelectorAll('.circle')
let currentactive = 1;
next.addEventListener('click', () => {
currentactive++;
if (currentactive > circles.length) {
currentactive = circles.length
}
update()
})
prev.addEventListener('click', () => {
currentactive--;
if (currentactive < 1) {
currentactive = 1
}
update()
})
function update() {
circles.forEach((circle, id) => {
if (id < currentactive) {
circle.classList.add('active')
} else {
circle.classList.remove('active')
}
})
const actives = document.querySelectorAll('.active')
progress.style.width = (actives.length - 1) / (circles.length - 1) * 100 + '%'
if (currentactive === 1) {
prev.disabled = true
} else if (currentactive === circles.length) {
next.disabled = true
} else {
prev.disabled = false
next.disabled = false
}
}