文本域自适应
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>文本域自适应高度（模拟有道词典。。）</title> <link rel="stylesheet" href="../static/bootstrap-3.3.7-dist/css/bootstrap.min.css"> <link rel="stylesheet" href="../static/css/my_css.css"> </head> <body> <nav class="navbar navbar-default"> <div class="container-fluid"> <!-- Brand and toggle get grouped for better mobile display --> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="#">文本域自适应</a> </div> <!-- Collect the nav links, forms, and other content for toggling --> <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> <ul class="nav navbar-nav"> <li ><a href="#">测试1 <span class="sr-only">(current)</span></a></li> <li><a href="#">测试2</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">选项卡 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">卡1</a></li> <li><a href="#">卡2</a></li> <li><a href="#">卡3</a></li> <li role="separator" class="divider"></li> <li><a href="#">卡4</a></li> <li role="separator" class="divider"></li> <li><a href="#">退出卡</a></li> </ul> </li> </ul> <form class="navbar-form navbar-left"> <div class="form-group"> <input type="text" class="form-control" placeholder="请输入xxx"> </div> <button type="submit" class="btn btn-default">搜索</button> </form> <ul class="nav navbar-nav navbar-right"> <li><a href="#">user</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">个人中心 <span class="caret"></span></a> <ul class="dropdown-menu"> <li><a href="#">卡1</a></li> <li><a href="#">卡2</a></li> <li role="separator" class="divider"></li> <li><a href="#">卡3</a></li> </ul> </li> </ul> </div> </div> </nav> <div class="container-fluid box" style="padding-right: 10px"> <div class="row box-wrap"> <div> <div class="col-md-5 fanyi__input__bg col-md-offset-1"> <textarea id="inputOriginal" dir="auto" class="input__original__area" placeholder="请输入你要翻译的文字或网址" onchange="wenbenyuchange()"></textarea> </div> </div> <div> <div class="col-md-5 fanyi__input__bg"> <textarea id="inputOriginal_1" dir="auto" class="input__original__area" placeholder="请输入你要翻译的文字或网址"></textarea> </div> </div> </div> </div> <div class="footer" style="margin-top: 30px"> <div class="row"> <div class="col-md-12 text-center"> <span>©2019 前端</span> </div> </div> </div> <script type="text/javascript" src="../static/JS/jquery-3.3.1.js"></script> <script type="text/javascript" src="../static/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script> <script type="text/javascript"> //----------底部自适应 function myfooter() { if ($(document.body).height() < $(window).height()) { $(".footer").css({position: 'fixed', bottom: 0, '100%'}); } $(window).resize(function () { if ($(document.body).height() < $(window).height()) { $(".footer").css({position: 'fixed', bottom: 0, '100%'}); } else { $(".footer").css({position: 'relative'}); } }); } myfooter(); //---------- $(function () { // 为每一个textarea绑定事件使其高度自适应 $.each($("textarea"), function (i, n) { autoTextarea($(n)[0]); }); }); /** * 文本框根据输入内容自适应高度 * {HTMLElement} 输入框元素 * {Number} 设置光标与输入框保持的距离(默认0) * {Number} 设置最大高度(可选) */ var autoTextarea = function (elem, extra, maxHeight) { extra = extra || 0; 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 = 'both';//如果不希望使用者可以自由的伸展textarea的高宽可以设置其他值 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(); }; function wenbenyuchange() { var $textdata = $('#inputOriginal'); $('html ,body').animate({scrollTop: 0},0); $textdata.css('font-size','14px'); console.log($textdata.height()); $('#inputOriginal_1').css('height',$textdata.height()) } </script> </body> </html>
CSS
body { overflow-x: hidden; } textarea { outline: none; } .fanyi__input__bg { background: #f2f2f2; position: relative; z-index: 1; overflow: hidden; border-radius: 6px; margin-right: 10px; padding: 18px 50px 18px 18px; border: 1px solid transparent } .input__original__area { display: block; font-family: ArialMT, "Microsoft YaHei", Arial, sans-serif, Helvetica, STHeiti; width: 100%; min-height: 156px; padding: 0; border: 0; background: 0 0; font-size: 24px; color: #333; line-height: 30px; overflow: auto } .input__original__area::placeholder { font-family: Arial-BoldMT; font-size: 24px; color: rgba(102, 102, 102, .3) } .input__original__area::-moz-placeholder { font-family: Arial-BoldMT; font-size: 24px; color: rgba(102, 102, 102, .3) } .input__original__area::-webkit-input-placeholder { font-family: Arial-BoldMT; font-size: 24px; color: rgba(102, 102, 102, .3) } .input__original__area:-ms-input-placeholder { font-family: Arial-BoldMT; font-size: 24px; color: rgba(102, 102, 102, .3) } .input__original__area::selection { background-color: #cfe5ff } .input__original__area:focus { border: none } .fanyi__input__bg__ar { padding: 18px 18px 18px 50px } .fanyi__input__bg:focus { border: 1px solid #0e7dff } .input__target .fanyi__input__bg { margin-right: 0; margin-left: 10px; padding: 0 }
结语
项目需求+搜索资料（JQ+bootstrap）