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index.js
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index.js
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/* Scroll animation constants */
const FRAMES = 9
const SCHEDULE = document.getElementById("schedule-section")
const SCHEDULE_IMAGE = document.getElementById("scroll-animation")
const START_PERCENTAGE = 40
const SNAKE_STEP = START_PERCENTAGE / FRAMES
const SCHEDULE_ITEMS_STEP = START_PERCENTAGE / 5 // 5 is items in the schedule
const SCHEDULE_ITEMS = document.querySelectorAll(".schedule-item")
const SCHEDULE_ITEMS_LEN = SCHEDULE_ITEMS.length
const STYLESHEET = document.getElementById("theme")
var darkMode = false
const NAVBAR = document.getElementById("navbar")
var animationChoice = 0
/* CHANGE SPECIFIC DATE */
const HACKATHON_DATE = new Date(2022, 5, 2, 1, 2, 3).getTime() // june 2nd at 1:02:03 ET
const DAYS_LEFT = document.getElementById("days-left")
const HOURS_LEFT = document.getElementById("hours-left")
const MINUTES_LEFT = document.getElementById("minutes-left")
const SECONDS_LEFT = document.getElementById("seconds-left")
/*
IntersecionObserver checks whether an element with the "on-scroll-aniamte" class
has appeared on the page. Once it has, a fadeInLeft or fadeInRight animation is
applied. Adding the class ensures that the animation only happens once.
*/
const observer = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
if (animationChoice == 0) {
entry.target.classList.add("animate__fadeInLeft")
animationChoice = 1
} else {
entry.target.classList.add("animate__fadeInRight")
animationChoice = 0
}
}
})
})
document.querySelectorAll(".on-scroll-animate").forEach(entry => {
if (entry) {
observer.observe(entry)
}
})
/* FAQ */
const faqObserver = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
entry.target.classList.add("animate__fadeIn")
}
})
})
document.querySelectorAll(".on-scroll-fade").forEach(entry => {
if (entry) {
faqObserver.observe(entry)
}
})
/* change stylesheet to corresponding theme */
function setTheme(darkMode) {
if (darkMode) {
STYLESHEET.href = "dark.css"
} else {
STYLESHEET.href = "light.css"
}
}
if (window.matchMedia) {
if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
darkMode = true
} else {
darkMode = false
}
} else {
darkMode = false
}
setTheme(darkMode)
function themeToggle() {
setTheme(!darkMode)
darkMode = !darkMode
}
/* The navbar and schedule are animated based on scrolling */
window.onscroll = function () { onScroll() }
function onScroll() {
navbarChange()
scheduleAnimate()
}
/* Make the navbar opaque if the page is scrolled beyond the landing section */
function navbarChange() {
if (window.scrollY > 200) {
navbar.classList.add("navbar-filled")
navbar.classList.remove("navbar-transparent")
} else {
navbar.classList.remove("navbar-filled")
navbar.classList.add("navbar-transparent")
}
}
function scheduleAnimate() {
var rect = SCHEDULE.getBoundingClientRect()
var distanceFromTop = rect.top
/* percentageScroll indicates how close the schedule element is to the top of the viewport */
var percentageScroll = (distanceFromTop / window.innerHeight) * 100
/* Check if the element is actually on the page */
if (percentageScroll < 0 || percentageScroll > 100) {
return
} else {
/*
If the element is at around START_PERCENTAGE or lower, then its current percentageScroll
determines the animation's frame. This also lets the animation to be reversed
*/
// ** snake animation **
if (percentageScroll <= START_PERCENTAGE) {
/* Gets the closest frame based on the STEP interval, depending on the current percentageScroll */
var currentSnakeFrame = Math.floor(FRAMES - (percentageScroll / SNAKE_STEP))
if (currentSnakeFrame > 8) {
currentSnakeFrame = 8
}
SCHEDULE_IMAGE.src = `resources/frames/${currentSnakeFrame}.png`
}
// ** schedule items animation **
/* Gets the closest frame based on the STEP interval, depending on the current percentageScroll */
var currentScheduleFrame = Math.floor(SCHEDULE_ITEMS_LEN - (percentageScroll / SCHEDULE_ITEMS_STEP))
if (currentScheduleFrame > SCHEDULE_ITEMS_LEN) {
currentScheduleFrame = SCHEDULE_ITEMS_LEN
}
SCHEDULE_ITEMS[currentScheduleFrame].classList.add("schedule-item-filled")
SCHEDULE_ITEMS[currentScheduleFrame].classList.remove("schedule-item-start")
}
}
/* Countdown timer */
// updates every second
var intervalID = setInterval(updateTimer, 1)
function updateTimer(){
var today = new Date().getTime()
var timeDiff = HACKATHON_DATE - today // time diff in milleseconds
var timeDiffDays = Math.floor(timeDiff / (1000 * 60 * 60 * 24))
var timeDiffHours = Math.floor((timeDiff % (timeDiffDays / timeDiff)) / (1000 * 60 * 60));
var timeDiffSeconds = Math.floor(timeDiff % (1000 * 60) / 1000);
var timeDiffMinutes = Math.floor((timeDiff % (1000 * 60 * 60)) / (1000 * 60))
if (timeDiff < 0) {
clearInterval(intervalID)
COUNTDOWN.innerHTML = "THE HACKATHON HAS STARTED!" // no more countdown :0
} else {
DAYS_LEFT.textContent = (timeDiffDays > 9) ? `${timeDiffDays}` : `${"0" + timeDiffDays}`
HOURS_LEFT.textContent = (timeDiffHours > 9) ? `${timeDiffHours}` : `${"0" + timeDiffHours}`
MINUTES_LEFT.textContent = (timeDiffMinutes > 9) ? `${timeDiffMinutes}` : `${"0" + timeDiffMinutes}`
SECONDS_LEFT.textContent = (timeDiffSeconds > 9) ? `${timeDiffSeconds}` : `${"0" + timeDiffSeconds}`
}
}