两种方式实现文本超出指定行数显示展开收起...

本文主要是介绍两种方式实现文本超出指定行数显示展开收起...，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

需要实现这样一个功能

默认高度下文本超出隐藏，点击展开可查看所有内容，点击收起可折叠

在这里插入图片描述

方法一：通过html和css实现

代码部分

html:<div className="expand-fold"><input id="check-box" type="checkbox" /><div className="content">{/* htmlFor和input的id一致 */}<label className="label" htmlFor="check-box"></label><span>Lorem ipsum dolor sit amet consectetur adipisicing elit. Explicaboquas architecto perspiciatis voluptas odio magni dolorem doloribusrecusandae commodi accusamus voluptates, laudantium tempora, estsoluta blanditiis labore tempore officia ipsam! Lorem ipsum dolorsit amet consectetur adipisicing elit. Explicabo quas architectoperspiciatis voluptas odio magni dolorem doloribus recusandaecommodi accusamus voluptates, laudantium tempora, est solutablanditiis labore tempore officia ipsam!</span></div></div>css:.expand-fold {display: flex;#check-box { // 将勾选框隐藏display: none;}#check-box:checked + .content { // 选中勾选框(点击展开)时修改最大高度，合理即可max-height: 800px;}#check-box:checked + .content .label { // 展开时，隐藏省略号，文字改为收起&::before {// 隐藏省略号content: '';}&::after {content: '收起';}}.content { font-size: 16px;flex: 1;max-height: 46px;line-height: 23px;overflow: hidden;&::before { // 将展开/收起文字对齐最右边content: '';float: right;height: calc(100% - 23px);}}.label { // 展开收起文字部分position: relative;float: right;clear: both;font-size: 16px;padding: 0 8px;color: #26caf8;border-radius: 4px;cursor: pointer;&::before { // 默认展开时添加省略号content: '...';position: absolute;left: -5px;color: #333;transform: translateX(-100%);}&::after {content: '展开';}}}

方法二：通过AntDesign + react实现组件封装

AntDesign默认只有展开功能，没有收起功能，以下是基于Typography组件实现展开收起

组件UI部分

import { Typography } from 'antd';
import React, { useState } from 'react';
import style from './index.less';const { Paragraph } = Typography;export type ExpandTextType = {rows?: number;symbol?: React.ReactNode;foldSlot?: React.ReactNode;children?: React.ReactNode;
};const defaultSymbol = () => (<span className="ant-typography">展开 <i className="iconfont icon-jiantou-shaixuanzhankai"></i></span>
);const Example: React.FC<ExpandTextType> = (props) => {const { rows = 2, symbol = defaultSymbol(), foldSlot } = props;const [ellipsis, setEllipsis] = useState(false);const [counter, setCounter] = useState(0);const onFold = () => {setEllipsis(!ellipsis);setCounter(counter + 1);};const onExpand = () => {setEllipsis(!ellipsis);setCounter(counter + 0);};// 自定义收起文案const renderFold = () => {return (<a className="ant-typography-fold" onClick={onFold}>{foldSlot ? (foldSlot) : (<span>收起<i className="iconfont icon-jiantou-shaixuanzhankai icon-fold"></i></span>)}</a>);};return (<div className={style['container']}><Paragraphkey={counter}ellipsis={{rows,expandable: true,symbol,onExpand,}}>{props?.children}{ellipsis && renderFold()}</Paragraph></div>);
};export default Example;

组件css

.container {:global {.ant-typography {margin-bottom: 0;}.ant-typography-expand,.ant-typography-fold {color: #089cdb;font-size: 13px;cursor: pointer;height: 17px;line-height: 17px;margin-left: 4px;.iconfont.icon-jiantou-shaixuanzhankai {display: inline-block;font-size: 10px;transform: rotate(90deg);}.iconfont.icon-jiantou-shaixuanzhankai.icon-fold {transform: rotate(-90deg);margin-left: 4px;}}}
}

页面使用组件

import ExpandText from '@/components/ExpandText'; 
import style from './index.less';export type ExampleType = unknown;
const Example: React.FC<ExampleType> = () => {return (<div className={style.container}><ExpandText>这里放入要展示的文案内容啊...</ExpandText></div>);
};export default Example;