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main.js
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main.js
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window.addEventListener('scroll', onScroll)
const navigation = document.getElementById('navigation')
onScroll()
function onScroll() {
showNavOnScroll()
showBackToTopButtonOnScroll()
activateMenuAtCurrentSection(home)
activateMenuAtCurrentSection(jobs)
activateMenuAtCurrentSection(testimonials)
}
function activateMenuAtCurrentSection(section) {
const targetLine = scrollY + innerHeight / 2
const sectionTop = section.offsetTop
const sectionHeight = section.offsetHeight
const sectionTopReachOrPassedTargetline = targetLine >= sectionTop
const sectionEndsAt = sectionTop + sectionHeight
const sectionEndPassedTargetline = sectionEndsAt <= targetLine
// limites da seção
const sectionBoundaries =
sectionTopReachOrPassedTargetline && !sectionEndPassedTargetline
const sectionId = section.getAttribute('id')
const menuElement = document.querySelector(`.menu a[href*=${sectionId}]`)
menuElement.classList.remove('active')
if (sectionBoundaries) {
menuElement.classList.add('active')
}
}
function showNavOnScroll() {
if (scrollY > 0) {
navigation.classList.add('scroll')
} else {
navigation.classList.remove('scroll')
}
}
function showBackToTopButtonOnScroll() {
if (scrollY > 550) {
backToTopButton.classList.add('show')
} else {
backToTopButton.classList.remove('show')
}
}
function openMenu() {
document.body.classList.add('menu-expanded')
}
function closeMenu() {
document.body.classList.remove('menu-expanded')
}