Created
January 16, 2010 14:00
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A self-expanding textarea similar to Facebook’s implementation
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<!DOCTYPE html> | |
<html> | |
<head> | |
<title>Self-expanding textarea</title> | |
</head> | |
<body> | |
<textarea id="expand" rows="8" cols="40"></textarea> | |
<script type="text/javascript" charset="utf-8"> | |
var textarea = document.getElementById('expand') | |
var div = document.createElement('div') | |
if (textarea) | |
{ | |
var style = function (s) { return getStyle(textarea, s) } | |
var clone = div.style | |
clone.visibility = 'hidden' | |
clone.position = 'relative' | |
clone.zIndex = '1' | |
// Kopiera utseendet | |
clone.width = style('width') | |
clone.fontFamily = style('font-family') | |
clone.fontSize = style('font-size') | |
clone.fontStyle = style('font-style') | |
clone.fontVariant = style('font-variant') | |
clone.lineHeight = style('line-height') | |
clone.wordSpacing = style('word-spacing') | |
clone.letterSpacing = style('letter-spacing') | |
// In med den | |
textarea.parentNode.insertBefore(div, textarea) | |
// Upddatera | |
setInterval('resize()', 200) | |
} | |
function resize() | |
{ | |
text = textarea.value.htmlescape().replace(/\n/g, '<br>') | |
.replace(/ /g, ' ') | |
// Bufferthöjd | |
+ '<br>'.repeat(2) + ' ' | |
div.innerHTML = text | |
textarea.style.height = div.offsetHeight + 'px' | |
} | |
// Byter ut speciella HTML-tecken mot deras entiteter | |
String.prototype.htmlescape = function() | |
{ | |
return this.replace(/</g, '<') | |
.replace(/>/g, '>') | |
.replace(/"/g, '"') | |
.replace(/'/g, ''') | |
} | |
// Upprepar en sträng @i@ gånger | |
String.prototype.repeat = function(i) | |
{ | |
return new Array(1 + i).join(this) | |
} | |
// Source: http://quirksmode.org/ | |
function getStyle(x, styleProp) | |
{ | |
return x.currentStyle ? x.currentStyle[styleProp] | |
: document.defaultView | |
.getComputedStyle(x, null) | |
.getPropertyValue(styleProp) | |
} | |
</script> | |
</body> | |
</html> |
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You're my hero.