通过vue3+element-plus实现el-table的子列表懒加载?

图片.png
请问各位大佬们 如何通过vue3+element-plus实现el-table的子列表懒加载???该如何实现点击左侧的箭头实现子节点的懒加载?不然数据多的情况下 会导致卡顿。求指教,谢谢!!!

<el-table :data="tableData" style="width: 99%" border  >
          <el-table-column type="expand">
            <template #default="props">
              <div>
                <el-table :data="props.row.children">
                  <el-table-column prop="sat_no" label="卫星号" align="center" />
                  <el-table-column prop="sat_freq" label="卫星频段" align="center">
                    <template #default="{ row }">
                      <span v-if="row.sat_freq === 0">L1</span>
                      <span v-else-if="row.sat_freq === 1">L2</span>
                      <span v-else-if="row.sat_freq === 2">L5</span>
                    </template>
                  </el-table-column>
                  <el-table-column prop="sat_type" label="类型" align="center">
                    <template #default="{ row }">
                      <span v-if="row.sat_type == 0">GPS</span>
                      <span v-else-if="row.sat_type == 1">GLONASS</span>
                      <span v-else-if="row.sat_type == 2">GALILEO</span>
                      <span v-else-if="row.sat_type == 3">BDS</span>
                      <span v-else-if="row.sat_type == 4">QZSS</span>
                      <span v-else-if="row.sat_type == 5">NAVIC</span>
                    </template>
                  </el-table-column>
                  <el-table-column prop="sat_angle_h" label="高度角(度)" align="center" />
                  <el-table-column prop="sat_angle_p" label="方位角(度)" align="center" />
                  <el-table-column prop="sat_snr_1" label="L1/B1/E1信噪比" align="center" />
                  <el-table-column prop="sat_snr_2" label="L2/B2/E2信噪比" align="center" />
                  <el-table-column prop="sat_snr_3" label="L3/B3/E3信噪比" align="center" />
                  <el-table-column prop="sat_used" label="是否使用" align="center">
                    <template #default="{ row }">
                      <span>{{ row.sat_used === true ? '是' : '否' }}</span>
                    </template>
                  </el-table-column>
                </el-table>
              </div>
            </template>
          </el-table-column>
          <el-table-column label="时间戳" prop="time" />
          <el-table-column label="卫星个数" prop="sat_count" />
        </el-table>
<script setup lang='ts'>
let tableData = ref([])
let dataList = ref([])
async function TrackTableList() {
  const DeviceCountsList = await api.Device()
  const { data: res } = DeviceCountsList
  const formattedData = {
    time: DeviceCountsTime(res.time),
    sat_count: res.sat_count,
    children: res.sat_info,
  };
  if (tableData.value.length > 0) {
    // 更新当前行数据
    tableData.value.splice(0, 1, formattedData);
  } else {
    // 第一次调用接口时,添加数据到tableData
    tableData.value.push(formattedData);
  }
  dataList.value = res.sat_info;
}
</script>

这是后台返回的数据格式:图片.png

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avatarAI BotBETA

在 Vue 3 和 Element Plus 中实现 el-table 的子列表懒加载,你需要考虑以下几点:

  1. 数据准备:首先,你需要准备好数据。在给定的例子中,你已经有了卫星信息的数据,这是子列表的数据源。
  2. 分页处理:由于你可能有很多数据,你需要实现分页来避免一次性加载所有数据。你可以使用 vue-pagination-2 这样的库来简化分页处理。
  3. 点击事件处理:你需要监听 el-table 的某个元素(例如箭头)的点击事件,当点击时,从服务器加载下一页的数据。
  4. 动态表格内容:你可以使用 v-ifv-show 来控制子列表的显示与隐藏。

以下是一个简化的示例代码:

<template>
  <div>
    <el-table :data="tableData" style="width: 100%" border>
      <el-table-column type="expand">
        <template #default="props">
          <div v-if="props.row.children && props.row.children.length > 0">
            <el-table :data="props.row.children">
              <!-- Your table columns here -->
            </el-table>
          </div>
        </template>
      </el-table-column>
      <!-- Your other table columns here -->
    </el-table>
    <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="currentPage"
      :page-sizes="[10, 20, 50]"
      :page-size="pageSize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
  </div>
</template>

<script setup lang="ts">
import { ref } from 'vue';
import axios from 'axios'; // You may use a different HTTP client library if needed
import { ElTable, ElTableColumn } from 'element-plus';
import 'element-plus/lib/theme-chalk/index.css'; // Import Element Plus styles if not already imported in your main app file
import { ElPagination } from 'element-plus';
import Pagination from 'vue-pagination-2'; // Import pagination component if not already imported in your main app file

let tableData = ref([]); // Store the main table data
let total = ref(0); // Store the total number of records for pagination
let currentPage = ref(1); // Current page of data to load from server
let pageSize = ref(10); // Number of records per page for pagination
let dataList = ref([]); // Store the fetched data for display in the table
let isLoading = ref(false); // Flag to prevent duplicate requests when clicking on pagination controls
let initialLoad = true; // Flag to prevent loading data on the initial page load when data is already present in the tableData array

// Fetch data from server on current page change or initial load and update tableData and other relevant variables accordingly
async function fetchData() {
  if (isLoading.value) return; // Prevent duplicate requests when clicking on pagination controls
  isLoading.value = true; // Set loading flag to prevent further duplicate requests while data is being fetched from the server
  try {
    const response = await axios.get('/api/data', { params: { page: currentPage.value, size: pageSize.value } }); // Adjust your API endpoint and parameters accordingly
    const { data, total } = response.data; // Extract relevant data from the response object as needed for your use case
    if (initialLoad && tableData.value.length > 0) { // If this is the initial load and there is already data in the tableData array, replace the existing data with the new data fetched from the server instead of appending it as in subsequent paginated loads
      tableData.value = [...data]; // Spread operator used to create a shallow copy of the data array to avoid mutating the original array directly, which would affect the display of subsequent paginated loads if not done this way
    } else {
      tableData.value = [...tableData.value, ...data]; // Append new data to the existing tableData array as in subsequent paginated loads using the spread operator to avoid mutating the original array directly, which would affect the display of previous paginated loads if not done this way
    }
1 个回答

recording.gif
观察了下文档里示例的行为 不展开的时候这个元素都不渲染,数据多了也不会卡吧。除非所有行都被展开

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