Vue 實現文本溢出展開收起詳情功能

這類功能很常見，其實之前也寫過，今天特意整理出來分享給大家，我這里分裝成一個組件，大家有需要的可以復制即用。

完整代碼：

<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)">
            展開
            <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: {
      // 文本內容
      type: String,
      default: () => '',
    },
    expand: {
      // 折疊顯示行數
      type: Number,
      default: () => 3,
    },
    showBtn: {
      // 展開、折疊按鈕
      type: Boolean,
      default: true,
    },
    showBtnIcon: {
      // 展開、折疊icon
      type: Boolean,
      default: true,
    },
    showPopover: {
      // popover顯示全文本
      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, // 判斷是否需要折疊展示按鈕
      showPopoverJudge: false, // 判斷是否需要折疊展示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: ${this.expand};-webkit-box-orient: vertical;text-overflow: ellipsis;overflow: hidden;`;
      this.showFull = value;
    },
    textExpand() {
      // 判斷是否需要折疊
      this.$nextTick(() => {
        const { expand } = this;
        const textExpandStyle = window.getComputedStyle(this.$refs.textExpand);
        const textExpandHeight = parseFloat(textExpandStyle.height); //獲取總高度
        const textExpandLineHeight = parseFloat(textExpandStyle.lineHeight); //獲取行高
        // 計算行高
        const rects = Math.ceil(textExpandHeight / textExpandLineHeight);
        if (rects <= expand) {
          // 不需要折疊展示
          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>

總結

以上就是今天要分享的內容，本文僅僅簡單介紹了平常工作中常見的需求，同一種需求不同狀態下寫，代碼也會不一樣，寫文章也是為了更好的總結，從中慢慢積累經驗。