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76 lines
2.4 KiB
JavaScript
76 lines
2.4 KiB
JavaScript
// TextScramble
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class TextScramble {
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constructor(el) {
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this.el = el
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this.chars = '!<>-_\\/[]{}—=+*^?#________'
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this.update = this.update.bind(this)
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}
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setText(newText) {
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const oldText = this.el.innerText
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const length = Math.max(oldText.length, newText.length)
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const promise = new Promise((resolve) => this.resolve = resolve)
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this.queue = []
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for (let i = 0; i < length; i++) {
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const from = oldText[i] || ''
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const to = newText[i] || ''
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const start = Math.floor(Math.random() * 40)
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const end = start + Math.floor(Math.random() * 40)
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this.queue.push({from, to, start, end})
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}
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cancelAnimationFrame(this.frameRequest)
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this.frame = 0
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this.update()
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return promise
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}
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update() {
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let output = ''
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let complete = 0
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for (let i = 0, n = this.queue.length; i < n; i++) {
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let {from, to, start, end, char} = this.queue[i]
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if (this.frame >= end) {
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complete++
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output += to
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} else if (this.frame >= start) {
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if (!char || Math.random() < 0.28) {
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char = this.randomChar()
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this.queue[i].char = char
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}
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output += `<span class="dud">${char}</span>`
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} else {
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output += from
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}
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}
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this.el.innerHTML = output
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if (complete === this.queue.length) {
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this.resolve()
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} else {
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this.frameRequest = requestAnimationFrame(this.update)
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this.frame++
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}
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}
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randomChar() {
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return this.chars[Math.floor(Math.random() * this.chars.length)]
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}
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}
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const phrases = [
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"Hey!",
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"That's my page!",
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"if you like", "check out", "my social media", "below :D"
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]
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const el = document.querySelector('.text')
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const fx = new TextScramble(el)
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let counter = 0
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const next = () => {
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fx.setText(phrases[counter]).then(() => {
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setTimeout(next, 600)
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})
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counter = (counter + 1) % phrases.length
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}
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next() |