el-table 表格从下往上滚动,触底自动请求新数据

发布于:2024-04-20 ⋅ 阅读:(18) ⋅ 点赞:(0)

关键点:

1、 el-table 需要设置高度 height;

2、el-table 外层盒子需要设置一个高度,并且设置 overflow:hidden;

3、获取 el-table 的 bodyWrapper:divData

      divData.scrollTop + divData.clientHeight + 1 >= divData.scrollHeight;(触底)

      重新请求数据;并将列表置顶:设置 divData.scrollTop = 0;

4、为el-table 添加鼠标移入移除事件,启停滚动;

<!--
 * @Author: xxx
 * @objectDescription: 滚动、合并行table
 * @Date: 2024-04-16 14:35:58
-->
<template>
  <div class="span-roll-table">
    <div class="table-contain">
      <el-table
        ref="rollTable"
        :data="list"
        height="100%"
        :span-method="objectSpanMethod"
        :header-cell-style="{
          textAlign: 'center',
          width: 'fit-content',
          backgroundColor: '#F2F6FC',
        }"
        class="table"
        @mouseenter.native="stopScroll"
        @mouseleave.native="startScroll"
      >
      </el-table>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [],
      rollTimer: null,
    };
  },
  mounted() {
    this.startScroll();
  },
  methods: {
    // 获取新数据
    async onChange() {
      this.list = [
        {
          name: "1",
        },
        {
          name: "2",
        },
        {
          name: "3",
        },
        {
          name: "4",
        },
      ];

      // 将列表置顶
      this.$nextTick(() => {
        const table = this.$refs.rollTable;
        const divData = table.bodyWrapper;
        divData.scrollTop = 0;
      });
    },
    // 开始滚动
    startScroll() {
      this.tableScroll(false);
    },
    // 停止滚动
    stopScroll() {
      this.tableScroll(true);
    },
    // 列表滚动
    tableScroll(stop) {
      if (stop) {
        if (this.rollTimer) {
          clearInterval(this.rollTimer);
          return;
        }
      }
      const table = this.$refs.rollTable;
      const divData = table.bodyWrapper;
      this.rollTimer = setInterval(() => {
        divData.scrollTop += 2;
        this.$nextTick(() => {
          if (
            divData.scrollTop + divData.clientHeight + 1 >=
            divData.scrollHeight
          ) {
            this.onChange();
          }
        });
      }, 200);
    },
    // 合并列表第一个单元格(并列排名)
    objectSpanMethod({ row, column, rowIndex, columnIndex }) {
      if (columnIndex === 0) {
        // 获取当前单元格的值(单元格项一定要配置 prop 属性,否则拿不到值!!!!)
        const currentValue = row[column.property];
        // 获取上一行相同列的值
        const preRow = this.typeTableData[rowIndex - 1];
        const preValue = preRow ? preRow[column.property] : null;
        // 如果当前值和上一行的值相同,则将当前单元格隐藏
        if (currentValue === preValue) {
          return { rowspan: 0, colspan: 0 };
        } else {
          // 否则计算当前单元格应该跨越多少行
          let rowspan = 1;
          for (let i = rowIndex + 1; i < this.typeTableData.length; i++) {
            const nextRow = this.typeTableData[i];
            const nextValue = nextRow[column.property];
            if (nextValue === currentValue) {
              rowspan++;
            } else {
              break;
            }
          }
          return { rowspan, colspan: 1 };
        }
      }
    },
  },
  beforeDestroy() {
    clearInterval(this.rollTimer);
    this.startScroll = () => {};
  },
};
</script>
<style lang="less" scoped>
.span-roll-table {
  height: 400px;

  .table-contain {
    height: 100%;
    overflow: hidden;
  }
}

/* 隐藏滚动条,但仍然可以滚动 */
::v-deep .el-table__body-wrapper::-webkit-scrollbar {
  display: none; /* 针对Webkit浏览器 */
}
</style>

参考文章