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">
<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 navigationspan>
<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>
<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2a>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1a>li>
<li><a href="#">卡2a>li>
<li><a href="#">卡3a>li>
<li role="separator" class="divider">li>
<li><a href="#">卡4a>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="#">usera>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1a>li>
<li><a href="#">卡2a>li>
<li role="separator" class="divider">li>
<li><a href="#">卡3a>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, width: '100%'});
}
$(window).resize(function () {
if ($(document.body).height() < $(window).height()) {
$(".footer").css({position: 'fixed', bottom: 0, width: '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）