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文本框根據(jù)輸入內(nèi)容自適應(yīng)高度的代碼

 更新時(shí)間:2011年10月24日 00:40:02   作者:  
我最煩wordpress編輯器容器那狹窄的高度,每次都需要手動(dòng)調(diào)節(jié),很不好用
其實(shí)現(xiàn)代瀏覽器大多都支持文本框尺寸調(diào)節(jié)功能,絕大多數(shù)情況下卻沒有自動(dòng)適應(yīng)來(lái)得爽快,在網(wǎng)絡(luò)上發(fā)現(xiàn)一方法比較簡(jiǎn)單的實(shí)現(xiàn)文本框高度自適應(yīng),于是封裝了這個(gè)函數(shù),準(zhǔn)備以后應(yīng)用到項(xiàng)目中。
源代碼:
23:03文章更新:
感謝alucelx同學(xué)再次給力的幫助,大大簡(jiǎn)化了方法,更新代碼為0.2版本,同時(shí)解決了兼容Opera瀏覽器,至此全兼容IE6+與現(xiàn)代瀏覽器!
在線演示: http://demo.jb51.net/js/2011/autoArea/index.htm
autoTextarea.js
復(fù)制代碼 代碼如下:

/**
* 文本框根據(jù)輸入內(nèi)容自適應(yīng)高度
* @author tang bin
* @version 0.3
* @see http://www.planeart.cn/?p=1489
* @param {HTMLElement} 輸入框元素
* @param {Number} 設(shè)置光標(biāo)與輸入框保持的距離(默認(rèn)20)
* @param {Number} 設(shè)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.maxHeight = 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();
};

測(cè)試代碼:
<!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(jù)輸入內(nèi)容自適應(yīng)高度</title>
<style type="text/css">
#textarea { font: 1.4em/1.8em Arial; overflow: hidden; width: 550px; height: 6em; padding:10px; }
</style>
<script src="autoTextarea.js"></script>
</head>
<body style="background:#FBFCFD url(http://goo.gl/kLsZX);">
<textarea id="textarea"></textarea>
<script>
var text = document.getElementById("textarea"),
tip = '想寫點(diǎn)什么..';
autoTextarea(text);// 調(diào)用
text.value = tip;
text.onfocus = function () {
if (text.value === tip) text.value = '';
};
text.onblur = function () {
if (text.value === '') text.value = tip;
};
</script>
</body>
</html>

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