Vue.JS实现垂直方向展开、收缩不定高度模块的JS组件

2019-11-19 13:38:07

字体：大中小

来源：转载

供稿：网友

需求分析：

如图，有很多高度不固定的模块（图中只显示两个，本人项目有十三个），点击模块标题展开相应的模块，再次点击此模块匿藏，如何实现此需求并实现复用？

点击红框前：

这里写图片描述

点击后：

这里写图片描述

难点分析:

模块高度不固定。比如，本人一开始想到的方法如下：

<!DOCTYPE html><html lang="en"><head>  <meta charset="UTF-8">  <title>Title</title>  <style>    .box{      height:500px;      background-color:black;        overflow: hidden;                }    .mybox-leave-active,.mybox-enter-active{      transition: all 1s ease;     }    .mybox-leave-active,.mybox-enter{      height:0px !important;    }    .mybox-leave,.mybox-enter-active{      height: 500px;    }  </style></head><body><div id="box">  <transition name="mybox">    <div class="box" v-show="boxshow"></div>  </transition>  <button @click="togglebox">按钮</button></div></body><script src="../bower_components/vue/dist/vue.js"></script><script>  new Vue({    el:'#box',    data:{      boxshow:false    },    methods:{      togglebox:function(){        this.boxshow = !this.boxshow;      }    }     });</script></html>

这种方法确实可以实现点击展开，再次点击收缩的需求，但是有一个明显的缺点：限定了容器的高度，也就是每个模块都需要固定高度，并不适用于需求场景。

解决方案：

1、实现一个函数式组件

本人命名为vertical-toggle.js// Created by xiaoqiang on 17/04/2018.const elTransition = '0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out'const Transition = { 'before-enter' (el) {  el.style.transition = elTransition  if (!el.dataset) el.dataset = {}  el.dataset.oldPaddingTop = el.style.paddingTop  el.dataset.oldPaddingBottom = el.style.paddingBottom  el.style.height = 0  el.style.paddingTop = 0  el.style.paddingBottom = 0 }, 'enter' (el) {  el.dataset.oldOverflow = el.style.overflow  if (el.scrollHeight !== 0) {   el.style.height = el.scrollHeight + 'px'   el.style.paddingTop = el.dataset.oldPaddingTop   el.style.paddingBottom = el.dataset.oldPaddingBottom  } else {   el.style.height = ''   el.style.paddingTop = el.dataset.oldPaddingTop   el.style.paddingBottom = el.dataset.oldPaddingBottom  }  el.style.overflow = 'hidden' }, 'after-enter' (el) {  el.style.transition = ''  el.style.height = ''  el.style.overflow = el.dataset.oldOverflow }, 'before-leave' (el) {  if (!el.dataset) el.dataset = {}  el.dataset.oldPaddingTop = el.style.paddingTop  el.dataset.oldPaddingBottom = el.style.paddingBottom  el.dataset.oldOverflow = el.style.overflow  el.style.height = el.scrollHeight + 'px'  el.style.overflow = 'hidden' }, 'leave' (el) {  if (el.scrollHeight !== 0) {   el.style.transition = elTransition   el.style.height = 0   el.style.paddingTop = 0   el.style.paddingBottom = 0  } }, 'after-leave' (el) {  el.style.transition = ''  el.style.height = ''  el.style.overflow = el.dataset.oldOverflow  el.style.paddingTop = el.dataset.oldPaddingTop  el.style.paddingBottom = el.dataset.oldPaddingBottom }}export default { name: 'VerticalToggle', functional: true, render (h, { children }) {  const data = {   on: Transition  }  return h('transition', data, children) }}

2、引用此组件

这里写图片描述