textarea.js文件

/** * 文本框根據輸入內容自適應高度 * @param {HTMLElement} 輸入框元素 * @param {Number} 設置光標與輸入框保持的距離(默認0) * @param {Number} 設置最大高度(可選) */ export default 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 = '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(); };

該文件是操作DOM元素，可以使用vue的自定義指令，方便使用

創建directives.js 文件用來放自定義指令

import Vue from 'vue' import autoTextarea from './assets/lib/textarea'Vue.directive('growHeight', {componentUpdated: function (el,bonding) {const grow = el.getAttribute('data-grow');if (grow==='false'){autoTextarea(el, bonding.value);el.setAttribute('data-grow','true');}},inserted: function (el) {el.setAttribute('data-grow','false');} });

如果DOM綁定數據，當第一次改變綁定的數據時，才調用autoTextarea事件

使用

<textarea v-grow-height="60" id="textarea" maxlength="500" placeholder="請輸入作品描述，不超過500字"v-model="data"></textarea>

樣式自己修改

#textarea {display: block;width: 676px;border: 0;margin-left: 10px;font-size: 15px;outline: none;border-radius: 5px;padding: 14px;background-color: #efe9db;word-break: break-all;min-height: 100px;}textarea {outline: 0 none;}

　　

?

轉載于:https://www.cnblogs.com/eunuch/p/10407534.html

總結

以上是生活随笔為你收集整理的vue中textarea标签自适应高度的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。