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About Vue.JS’s method of vertically expanding and contracting JS components of variable-height modules

不言Original: 2018-06-19 17:11:341861browse

This article mainly introduces the JS components of Vue.JS that implement vertical expansion and shrinking of modules with variable height. This article introduces you to it in great detail and has certain reference value. Friends who need it can refer to it

Requirement analysis:

As shown in the picture, there are many modules with variable heights (only two are shown in the picture, and there are thirteen in my project), click Expand the corresponding module in the module title, and click this module again to hide it. How to realize this requirement and achieve reuse?

Before clicking the red box:

About Vue.JS’s method of vertically expanding and contracting JS components of variable-height modules

After clicking:

About Vue.JS’s method of vertically expanding and contracting JS components of variable-height modules

Difficulty Analysis:

The module height is not fixed. For example, the method I initially thought of is as follows:

<!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>
<p id="box">
  <transition name="mybox">
    <p class="box" v-show="boxshow"></p>
  </transition>
  <button @click="togglebox">按钮</button>
</p>
</body>
<script src="../bower_components/vue/dist/vue.js"></script>
<script>
  new Vue({
    el:&#39;#box&#39;,
    data:{
      boxshow:false
    },
    methods:{

      togglebox:function(){
        this.boxshow = !this.boxshow;
      }
    }   
  });
</script>
</html>

This method can indeed realize the need to click to expand and click to shrink again, but it has an obvious shortcoming: it limits the height of the container, that is, each module All require a fixed height and are not suitable for demand scenarios.

Solution:

1. Implement a functional component

本人命名为vertical-toggle.js
// Created by xiaoqiang on 17/04/2018.
const elTransition = &#39;0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out&#39;
const Transition = {
 &#39;before-enter&#39; (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
 },
 &#39;enter&#39; (el) {
  el.dataset.oldOverflow = el.style.overflow
  if (el.scrollHeight !== 0) {
   el.style.height = el.scrollHeight + &#39;px&#39;
   el.style.paddingTop = el.dataset.oldPaddingTop
   el.style.paddingBottom = el.dataset.oldPaddingBottom
  } else {
   el.style.height = &#39;&#39;
   el.style.paddingTop = el.dataset.oldPaddingTop
   el.style.paddingBottom = el.dataset.oldPaddingBottom
  }
  el.style.overflow = &#39;hidden&#39;
 },
 &#39;after-enter&#39; (el) {
  el.style.transition = &#39;&#39;
  el.style.height = &#39;&#39;
  el.style.overflow = el.dataset.oldOverflow
 },
 &#39;before-leave&#39; (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 + &#39;px&#39;
  el.style.overflow = &#39;hidden&#39;
 },
 &#39;leave&#39; (el) {
  if (el.scrollHeight !== 0) {
   el.style.transition = elTransition
   el.style.height = 0
   el.style.paddingTop = 0
   el.style.paddingBottom = 0
  }
 },
 &#39;after-leave&#39; (el) {
  el.style.transition = &#39;&#39;
  el.style.height = &#39;&#39;
  el.style.overflow = el.dataset.oldOverflow
  el.style.paddingTop = el.dataset.oldPaddingTop
  el.style.paddingBottom = el.dataset.oldPaddingBottom
 }
}
export default {
 name: &#39;VerticalToggle&#39;,
 functional: true,
 render (h, { children }) {
  const data = {
   on: Transition
  }
  return h(&#39;transition&#39;, data, children)
 }
}

2. Reference this component

About Vue.JS’s method of vertically expanding and contracting JS components of variable-height modules

That is It can be quoted in teamplate, please pay attention to the text description in the red box.

About Vue.JS’s method of vertically expanding and contracting JS components of variable-height modules

At this point, the implementation and application of Vue.js's vertical expansion and contraction of variable-height module components have been completed.

Implementation effect:

About Vue.JS’s method of vertically expanding and contracting JS components of variable-height modules

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