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scroller.js
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scroller.js
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class Scroller {
constructor(element) {
this.element = element;
this.element.querySelector('.right-button').addEventListener('click', this.goRight.bind(this)) //binding necessary?
this.element.querySelector('.left-button').addEventListener('click', this.goLeft.bind(this))
this.chosen = '1'
this.panelElements = {}
this.element.querySelectorAll('.panel').forEach(div => this.panelElements[div.dataset.panelId] = div)
this.spotElements = {}
this.element.querySelectorAll('.spot').forEach(div => this.spotElements[div.dataset.panelId] = div)
}
goRight() {
const currentNum = Number(this.chosen)
if (currentNum >= Object.keys(this.panelElements).length) {
this.chosen = '1'
} else {
this.chosen = String(currentNum + 1)
}
this.updateDOM()
}
goLeft() {
const currentNum = Number(this.chosen)
if (currentNum === 1) {
this.chosen = String(Object.keys(this.panelElements).length)
} else {
this.chosen = String(currentNum - 1)
}
this.updateDOM()
}
updateDOM() {
Object.values(this.panelElements).forEach(div => div.classList.remove('shown'))
Object.values(this.spotElements).forEach(div => div.classList.remove('shown'))
this.panelElements[this.chosen].classList.add('shown')
this.spotElements[this.chosen].classList.add('shown')
}
}
const scrollers = document.querySelectorAll('div.scroller')
scrollers.forEach(divElement => new Scroller(divElement))