72 lines
2.0 KiB
JavaScript
72 lines
2.0 KiB
JavaScript
const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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const typeWriterSpeed = 60;
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window.onload = function() {
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document.querySelectorAll(".scramble").forEach(item => {
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item.addEventListener("mouseover", scramble);
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});
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window.addEventListener('scroll', function() {
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const parallax = document.querySelector('.parallax')
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let scrollPosition = window.pageYOffset;
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parallax.style.transform = 'translateY(' + scrollPosition * .5 + 'px)';
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})
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document.querySelectorAll(".typewriter").forEach(item => {
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observer.observe(item);
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});
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}
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function sleep(milliseconds) {
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return new Promise(resolve => setTimeout(resolve, milliseconds));
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}
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function scramble(event){
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scrambleLetters(event.target);
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}
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function scrambleLetters(element) {
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let iterations = 0;
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const originalValue = element.dataset.value;
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let interval = setInterval(() => {
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element.innerText = element.innerText.split("")
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.map((letter, index) => {
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if(index < iterations){
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return originalValue[index];
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}
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return letters[Math.floor(Math.random() * letters.length)];
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}).join("")
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iterations += 1 / 3;
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if(iterations > originalValue.length){
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clearInterval(interval);
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element.innerText = originalValue;
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}
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}, 30);
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}
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async function typeWriter(element) {
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let typeWriterText = element.getAttribute("data-value");
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let output = element.innerText;
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for(let i = 0; i < typeWriterText.length; ++i){
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output += typeWriterText.charAt(i);
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// sleep for typeWriterSpeed milliseconds
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await sleep(typeWriterSpeed);
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element.innerText = output;
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}
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}
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let observer = new IntersectionObserver(function(entries) {
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for (let entry of entries){
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// If the element is visible, start the animation
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if(entry.isIntersecting) {
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typeWriter(entry.target);
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observer.unobserve(entry.target);
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}
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}
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}, { threshold: 0.7 });
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