固定高度然后超出的内容，让高度自动随着内容增加而增加

电玩女神 2022-12-27 14:30 166阅读 0赞

*  利用scrollHeight,获取元素的实际高度,然后进行判断,动态设置元素的高度度
 *  这个例子是`更多和收起`例子

<template>
      <div class="subject bg_border" ref="parent" :style="{ height : height + 'px'}">
        <div class="subject_title">
          <span>{
       {title}}</span>
          <p class="more" @click="unfold" v-show="text">{
       { isClickMore ? "收起" : "更多"}}</p>
        </div>
    
        <div class="btn_gather clearFix" @click="(e)=>{getChildrenElement(e , cls , type)}">
          <div class="btn_item" v-for=" (item , index) in doMain" :key="item.name" :data-index="index" :data-id="item.id" >
            <span >{
       {item.name}}</span>
          </div>
        </div>
      </div>
    </template>
    <script> export default { name : "fold", data() { return { isClickMore: false }; }, props: { title: String, doMain: Array, cls: String, type: Number, text: { type: Boolean, default: true }, height : { type : Number, default : 120 } }, methods: { unfold(e) { this.isClickMore = !this.isClickMore; let parent = this.$refs.parent; // 获取元素实际需要占据的高度 let height = parent.scrollHeight // 判断是收起还是更多,动态设置高度 this.isClickMore ? parent.style.setProperty("height", height + 'px') : parent.style.setProperty("height", this.height + 'px'); }, getChildrenElement(e, className, type) { this.$emit("getChildrenElement", { e, className, type }); } } }; </script>
    <style lang="scss" scoped> .subject { width: 100%; box-sizing: border-box; padding: 0 10px; position: relative; overflow: hidden; transition: all 0.3s ease-out; .subject_title { height: 28px; font-size: 13px; font-weight: 600; color: #000; width: 100%; display: flex; align-items: center; justify-content: space-between; p { color: grey; } } .btn_gather { // height: 100px; // overflow: hidden; .btn_item { width: 84px; height: 34px; margin-bottom: 8px; text-align: center; line-height: 34px; border: 2px solid #e8e8e8; border-left: 1px solid #e8e8e8; border-right: 1px solid #e8e8e8; margin-right: 10px; color: #4c4c4c; font-size: 12px; position: relative; float: left; text-justify: newspaper; word-break: break-all; span { pointer-events: none; position: absolute; display: block; width: 100%; text-align: center; line-height: 34px; height: 100%; } } .btn_item_active::after { content: ""; border: 10px solid #4285f4; border-color: transparent #4285f4 #4285f4 transparent; position: absolute; right: 0; top: 39%; } .btn_item_active::before { content: ""; width: 7px; height: 3px; border: 1px solid #fff; border-color: transparent transparent #fff #fff; position: absolute; right: 2px; top: 68%; z-index: 3; transform: rotate(-35deg); } } } .over_subject { height: auto !important; } </style>