js制作的文本框根据输入内容自适应高度-JS特效-爱易网页

js制作的文本框根据输入内容自适应高度

日期：2014-05-18　浏览次数：20303 次

以下是程序代码

<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml" > 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>文本框根据输入内容自适应高度</title> 
<style type="text/css"> 
#textarea { font: 1.4em/1.8em Arial; overflow: hidden; width: 550px; height: 6em; padding:10px; }
</style> 
<script>
/**
 * 文本框根据输入内容自适应高度
 * @author                tang bin
 * @version                0.2
 * @see                        http://www.planeart.cn/?p=1489
 * @param                {HTMLElement}        输入框元素
 * @param                {Number}                设置光标与输入框保持的距离(默认20)
 * @param                {Number}                设置最大高度(可选)
 */
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</div></div>

<div class="clearfix"></div>
                    </div>
                    <nav aria-label="...">
                        <ul class="pager">
                            <li class="previous"><a href="4667">上一篇：狡猾的按钮特效</a></li>

<li class="next"><a href="3613">下一篇：点击提交按钮，文本框value值在1-3循环</a></li>
                        </ul>
                    </nav>

<div class="alert alert-warning" role="alert">
                        <strong>免责声明：</strong> 本文仅代表作者个人观点，与爱易网无关。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。
                    </div>

<div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34303' title='做大电影，阿里控股公司在港成立影业集团' target="_blank">
                        做大电影，阿里控股公司在港成立影业集团</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34121' title='一个非脑残米粉的思考：小米“成功之道”如何炼成' target="_blank">
                        一个非脑残米粉的思考：小米“成功之道”如何炼成</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34269' title='网络旅行游记被曝插入"软广告" 个别人士月入数万' target="_blank">
                        网络旅行游记被曝插入"软广告" 个别人士月入数万</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/10804' title='联发科享用价钱战 专利难以摆脱高通 ' target="_blank">
                        联发科享用价钱战 专利难以摆脱高通 </a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34306' title='刘强东：京东上市融资用于开拓三至六线城市' target="_blank">
                        刘强东：京东上市融资用于开拓三至六线城市</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34210' title='FB上广告费用昂贵而且效果不及Twitter' target="_blank">
                        FB上广告费用昂贵而且效果不及Twitter</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34323' title='MIUI，有了它小米就无惧对手' target="_blank">
                        MIUI，有了它小米就无惧对手</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/34259' title='诺基亚若没加入微软，只不过是另一个HTC而已' target="_blank">
                        诺基亚若没加入微软，只不过是另一个HTC而已</a></li></div>
                   
                
                  <div class="col-md-6 col-xs-12">
                      <li class="articleAbout"><a href='/ItNews/6919' title='原万网CTO周雷加盟亿玛 出任CTO一职' target="_blank">
                        原万网CTO周雷加盟亿玛 出任CTO一职</a></li></div>
                   
                
        </ol>
    </div>
</div>

</div>

</div>
            </div>
            <div class="clearfix"></div>

<footer class=" footer navbar-bottom">
<em>友情链接：</em>
    
      <a href="http://www.aiyiweb.com/" target="_blank">爱易网 </a>            
    
      <a href="http://www.aiyiweb.com/" target="_blank">云虚拟主机技术 </a>            
    
      <a href="http://www.aiyiweb.com/" target="_blank">云服务器技术 </a>            
    
      <a href="http://www.aiyiweb.com/" target="_blank">程序设计技术 </a>            
    
      <a href="http://www.aiyiweb.com/" target="_blank">开发网站 </a>            
    
      <a href="http://www.aiyiweb.com/" target="_blank">APP开发教程 </a>            
    
<br />
<script type="text/javascript">(function(){document.write(unescape('%3Cdiv id="bdcs"%3E%3C/div%3E'));var bdcs = document.createElement('script');bdcs.type = 'text/javascript';bdcs.async = true;bdcs.src = 'http://znsv.baidu.com/customer_search/api/js?sid=15239353030108964139' + '&plate_url=' + encodeURIComponent(window.location.href) + '&t=' + Math.ceil(new Date()/3600000);var s = document.getElementsByTagName('script')[0];s.parentNode.insertBefore(bdcs, s);})();</script>

Copyright © 2013-2026 爱易网页 当前在线：1705人　
        网站在1天2时37分29秒内访问总人数：328924人
    3秒前 44.63%
　<a href="https://beian.miit.gov.cn" target="_blank">粤ICP备18100884号-2 </a>
<script charset="UTF-8" id="LA_COLLECT" src="//sdk.51.la/js-sdk-pro.min.js"></script>
<script>LA.init({ id: "JszEmKrtpbU59dY5", ck: "JszEmKrtpbU59dY5" })</script>

</footer>

</div>
   
</body>
</html>