web/public/scripts/text-scramble.js

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JavaScript
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function applyScrambleEffect() {
const glitchTextOnceElements = document.querySelectorAll('.glitch-text');
const glitchTextRepeatElements = document.querySelectorAll('.glitch-text-interval');
function animateScramble(element, text, duration = 1000) {
const chars = [];
element.innerHTML = '';
const preScrambleWidth = element.offsetWidth;
element.style.width = `${preScrambleWidth}px`;
for (let t = 0; t < text.length; t++) {
const span = document.createElement('span');
span.innerHTML = text[t] === ' ' ? '&nbsp;' : text[t];
chars[t] = span;
span.style.display = 'inline-block';
element.appendChild(span);
}
const rand = Math.random;
const SECONDS = 1000;
const FPS = 30;
const animationLength = duration;
function animate3(k) {
const kk = k * text.length;
for (let i = 0; i < text.length; i++) {
if (kk < i) {
chars[i].innerHTML = String.fromCharCode(~~(65 + rand() * 26));
} else {
chars[i].innerHTML = text[i] === ' ' ? '&nbsp;' : text[i];
}
}
}
let start = Date.now();
function animate() {
const current = Date.now();
const time = current - start;
const k = time / animationLength;
if (k < 1) {
setTimeout(animate, SECONDS / FPS);
animate3(k);
} else {
for (let i = 0; i < text.length; i++) {
chars[i].innerHTML = text[i] === ' ' ? '&nbsp;' : text[i];
}
element.style.width = 'auto';
element.isAnimating = false;
}
}
animate();
}
const observer = new IntersectionObserver((entries, observer) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
const element = entry.target;
const text = element.innerText;
animateScramble(element, text);
observer.unobserve(element);
}
});
}, {
threshold: 0.1
});
glitchTextOnceElements.forEach((element) => {
observer.observe(element);
});
glitchTextRepeatElements.forEach((element) => {
const text = element.innerText;
animateScramble(element, text);
const intervalId = setInterval(() => {
if (!element.isAnimating) {
animateScramble(element, text);
}
}, 5000);
element.addEventListener('mouseenter', () => {
if (!element.isAnimating) {
clearInterval(intervalId);
animateScramble(element, text, 800);
element.isAnimating = true;
setTimeout(() => {
element.isAnimating = false;
}, 1000);
}
});
});
}
document.addEventListener('DOMContentLoaded', applyScrambleEffect);