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  <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>文本框根據輸入內容自適應高度</title> <style type="text/css"> #textarea { font: 1.4em/1.8em Arial; overflow: hidden; width: 550px; height: 6em; padding:10px; } </style> <script> /** * 文本框根據輸入內容自適應高度 * @author tang bin * @version 0.2 * @see http://www.planeart.cn/?p=1489 * @param {HTMLElement} 輸入框元素 * @param {Number} 設置光標與輸入框保持的距離(默認20) * @param {Number} 設置最大高度(可選) */ var autoTextarea = function (elem, extra, maxHeight) { extra = extra || 20; var isFirefox = !!document.getBoxObjectFor || 'mozInnerScreenX' in window, isOpera = !!window.opera && !!window.opera.toString().indexOf('Opera'), addEvent = function (type, callback) { elem.addEventListener ? elem.addEventListener(type, callback, false) : elem.attachEvent('on' + type, callback); }, getStyle = elem.currentStyle ? function (name) { var val = elem.currentStyle[name]; if (name === 'height' && val.search(/px/i) !== 1) { var rect = elem.getBoundingClientRect(); return rect.bottom - rect.top - parseFloat(getStyle('paddingTop')) - parseFloat(getStyle('paddingBottom')) + 'px'; }; return val; } : function (name) { return getComputedStyle(elem, null)[name]; }, minHeight = parseFloat(getStyle('height')); elem.style.resize = 'none'; var change = function () { var scrollTop, height, padding = 0, style = elem.style; if (elem._length === elem.value.length) return; elem._length = elem.value.length; if (!isFirefox && !isOpera) { padding = parseInt(getStyle('paddingTop')) + parseInt(getStyle('paddingBottom')); }; scrollTop = document.body.scrollTop || document.documentElement.scrollTop; elem.style.height = minHeight + 'px'; if (elem.scrollHeight > minHeight) { if (maxHeight && elem.scrollHeight > maxHeight) { height = maxHeight - padding; style.overflowY = 'auto'; } else { height = elem.scrollHeight - padding; style.overflowY = 'hidden'; }; style.height = height + extra + 'px'; scrollTop += parseInt(style.height) - elem.currHeight; document.body.scrollTop = scrollTop; document.documentElement.scrollTop = scrollTop; elem.currHeight = parseInt(style.height); }; }; addEvent('propertychange', change); addEvent('input', change); addEvent('focus', change); change(); }; </script> </head> <body style="background:#FBFCFD url(http://goo.gl/kLsZX);"> <textarea id="textarea">

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