Vue实现文本溢出展开收起详情功能

这类功能很常见，其实之前也写过，今天特意整理出来分享给大家，我这里分装成一个组件，大家有需要的可以复制即用。

<template>
  <div class="text-expand" ref="textExpand">
    <div v-if="!(showPopover && showPopoverJudge)">
      <span class="text-expand-content" :style="expandStyle">
        {{ text === null || text === undefined || text === '' ? '--' : text }}
      </span>
      <div class="expander">
        <span v-if="showBtn && showBtnJudge">
          <span v-if="!showFull" class="action action-expand" @click.stop="showFullFn(true)">
            展开
            <i v-if="showBtnIcon" class="el-icon-caret-bottom" />
          </span>
          <span v-else class="action action-pack" @click.stop="showFullFn(false)">
            收起
            <i v-if="showBtnIcon" class="el-icon-caret-top" />
          </span>
        </span>
      </div>
    </div>
    <el-popover v-else :placement="popoverPlace" trigger="hover">
      <div class="popover-content">
        {{ text }}
      </div>
      <span class="text-expand-content" :style="expandStyle" slot="reference">{{ text }}</span>
    </el-popover>
  </div>
</template>
<script>
export default {
  props: {
    text: {
      // 文本内容
      type: String,
      default: () => '',
    },
    expand: {
      // 折叠显示行数
      type: Number,
      default: () => 3,
    },
    showBtn: {
      // 展开、折叠按钮
      type: Boolean,
      default: true,
    },
    showBtnIcon: {
      // 展开、折叠icon
      type: Boolean,
      default: true,
    },
    showPopover: {
      // popover显示全文本
      type: Boolean,
      default: false,
    },
    popoverPlace: {
      // popover位置
      type: String,
      default: 'bottom',
    },
  },
  data() {
    return {
      showFull: false, // 是否展示全文本
      expandStyle: '',
      showBtnJudge: false, // 判断是否需要折叠展示按钮
      showPopoverJudge: false, // 判断是否需要折叠展示popover
    };
  },
  watch: {
    text: function () {
      this.textExpand();
    },
  },
  mounted() {
    this.textExpand();
  },
  methods: {
    showFullFn(value) {
      this.expandStyle = value
        ? ''
        : `display: -webkit-box;word-break: break-all;-webkit-line-clamp: ${this.expand};-webkit-box-orient: vertical;text-overflow: ellipsis;overflow: hidden;`;
      this.showFull = value;
    },
    textExpand() {
      // 判断是否需要折叠
      this.$nextTick(() => {
        const { expand } = this;
        const textExpandStyle = window.getComputedStyle(this.$refs.textExpand);
        const textExpandHeight = parseFloat(textExpandStyle.height); //获取总高度
        const textExpandLineHeight = parseFloat(textExpandStyle.lineHeight); //获取行高
        // 计算行高
        const rects = Math.ceil(textExpandHeight / textExpandLineHeight);
        if (rects <= expand) {
          // 不需要折叠展示
          this.showBtnJudge = false;
          this.showPopoverJudge = false;
        } else {
          this.showBtnJudge = true;
          this.showPopoverJudge = true;
          this.expandStyle = `display: -webkit-box;word-break: break-all;-webkit-line-clamp: ${this.expand};-webkit-box-orient: vertical;text-overflow: ellipsis;overflow: hidden;`;
        }
      });
    },
  },
};
</script>
<style lang="less" scoped>
.text-expand {
  &-content {
    word-break: break-all;
    white-space: pre-wrap;
  }
  .expander {
    text-align: right;
    .action {
      display: inline-block;
      font-size: 14px;
      color: #0281f0;
      cursor: pointer;
      i {
        display: inline;
        font-size: 12px;
      }
    }
    .action.action-pack {
      margin-left: 0;
    }
  }
}
.popover-content {
  max-width: 40vw;
  max-height: 30vh;
  overflow: hidden;
  overflow-y: auto;
  word-break: break-all;
}
</style>

本文仅仅简单介绍了平常工作中常见的需求，同一种需求不同状态下写，代码也会不一样，写文章也是为了更好的总结，从中慢慢积累经验。