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<!DOCTYPE html> | |
<html> | |
<head> | |
<style> | |
*, | |
*::before, | |
*::after { | |
box-sizing: border-box; | |
} | |
body { | |
margin: 30px; | |
background-color: #1a1b26; | |
} | |
.container, | |
.backdrop, | |
textarea { | |
width: var(--width); | |
height: var(--height); | |
} | |
.highlights, | |
textarea { | |
padding: 10px; | |
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; | |
font-size: 16px; | |
letter-spacing: 1px; | |
} | |
.container { | |
display: block; | |
margin: 0 auto; | |
transform: translateZ(0); | |
-webkit-text-size-adjust: none; | |
background: #24283b; | |
} | |
.container, | |
.container * { | |
scrollbar-color: dark; | |
} | |
.backdrop { | |
position: absolute; | |
z-index: 1; | |
overflow: auto; | |
pointer-events: none; | |
transition: transform 1s; | |
} | |
.highlights { | |
white-space: pre-wrap; | |
word-wrap: break-word; | |
color: #cfc9c2; | |
background-color: #24283b; | |
} | |
textarea { | |
display: block; | |
position: absolute; | |
z-index: 2; | |
margin: 0; | |
border: none; | |
border-radius: 0; | |
color: transparent; | |
background-color: transparent; | |
overflow: auto; | |
transition: transform 1s; | |
caret-color: #fff; | |
outline: none; | |
} | |
mark { | |
border-radius: 3px; | |
color: red; | |
background-color: transparent; | |
} | |
b { | |
color: #a9b1d6; | |
font-weight: inherit; | |
} | |
</style> | |
</head> | |
<body> | |
<div class="container"> | |
<div class="backdrop"> | |
<div class="highlights"></div> | |
</div> | |
<textarea> | |
**bold** | |
*italic* | |
~~strikethrough~~ | |
> quote | |
``` | |
code | |
``` | |
</textarea> | |
</div> | |
<script type="text/javascript"> | |
const container = document.querySelector('.container'); | |
const backdrop = document.querySelector('.backdrop'); | |
const highlights = document.querySelector('.highlights'); | |
const textarea = document.querySelector('textarea'); | |
function applyHighlights(text) { | |
text = text | |
.replace(/\n$/g, '\n\n') | |
/* Bold */ | |
.replace(/\*\*(.*?)\*\*/g, '<b><span style=color:#7a7a7aaa>**</span>$1<span style=color:#7a7a7aaa>**</span></b>') | |
/* Italic */ | |
.replace(/\*(.*?)\*/g, '<i><span style=color:#7a7a7aaa>*</span>$1<span style=color:#7a7a7aaa>*</span></i>') | |
/* Strikethrough */ | |
.replace(/~~(.*?)~~/g, '<span style=color:#7a7a7aaa>~~</span><s>$1</s><span style=color:#7a7a7aaa>~~</span>') | |
/* Quote */ | |
.replace(/^>(.*)/gm, '<span style=color:#7a7a7aaa>></span>$1') | |
/* Code */ | |
.replace(/```([a-z]+\s)?([\s\S]*?)```/g, | |
'<span style=color:#7a7a7aaa>```<span style=color:#242842>$1</span></span>$2<span style=color:#7a7a7aaa>```</span></span>') | |
return text; | |
} | |
function handleInput() { | |
const text = textarea.value; | |
const highlightedText = applyHighlights(text); | |
highlights.innerHTML = highlightedText; | |
} | |
function handleScroll() { | |
const scrollTop = textarea.scrollTop; | |
backdrop.scrollTop = scrollTop; | |
const scrollLeft = textarea.scrollLeft; | |
backdrop.scrollLeft = scrollLeft; | |
} | |
function handleSize() { | |
const width = textarea.offsetWidth; | |
const height = textarea.offsetHeight; | |
container.style.setProperty('--width', `${width}px`); | |
container.style.setProperty('--height', `${height}px`); | |
} | |
function bindEvents() { | |
textarea.oninput = handleInput; | |
textarea.onscroll = handleScroll; | |
textarea.onmousemove = handleSize; | |
} | |
bindEvents(); | |
handleInput(); | |
handleSize(); | |
</script> | |
</body> | |
</html> |
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