vue 解决el-table 表体数据发生变化时，未重新渲染问题

效果图

 父组件中数量改变后总数重新计算

子组件完整代码

<template><el-tableshow-summaryref="multipleTable"v-bind="$props"@selection-change="handleSelectionChange"@row-click="handleRowClick":summary-method="getSummaries"<--这里是关键-->:key="certKey"><slot/></el-table>
</template><script>
export default {props: ['data','certKey'],data() {return {selectionData: []}},watch: {certKey: {handler(val) { }},},methods: {// 向父组件共享数据handleSelectionChange(val) {this.$emit('selection-change', val)},handleRowClick(row, column, event) {// selectionData -- 已选的数据let index = this.selectionData.findIndex(item => {// 判断已选数组中是否已存在该条数据return item.id == row.id})if (index == -1) {// 如果未存在，设置已选状态，并在list中添加这条数据this.$refs.multipleTable.toggleRowSelection(row, true); //设置复选框为选中状态this.selectionData.push(row)} else {// 如果已存在，设置未选状态，并在list中删除这条数据this.$refs.multipleTable.toggleRowSelection(row, false); //设置复选框为未选状态this.selectionData.splice(index, 1)}},//getSummaries()返回的是一个展示的数组 getSummaries(param) {const { columns, data } = param;const sums = []; //声明变量columns.forEach((column, index) => {if (index === 0) {sums[index] = "合计";return;}//计算planQuantity字段的统计const values = data.map((item) => Number(item.planQuantity));//需要显示和合计纵列if ( column.property == "quantity"   ) {sums[index] = values.reduce((prev, curr) => {const value = Number(curr);if (!isNaN(value)) {return prev + curr;} else {return prev;}}, 0);} else {}});return sums;},}
}
</script>

父组件代码 WmsTable 是子组件名 WmsTable 中的数量字段quantity修改时重新计算合计

<template><div class="app-container"> </el-form><el-table v-loading="loading" :data="materialList" @selection-change="handleSelectionChange"><el-table-column type="selection" width="55" align="center"/><el-table-column label="id" align="center" prop="id" v-if="true"/><el-table-column label="编号" align="center" prop="materialNo"/><el-table-column label="名称" align="center" prop="materialName"/><el-table-column label="状态" align="center" prop="status"/><el-table-column label="备注" align="center" prop="remark"/><el-table-column label="操作" align="center" class-name="small-padding fixed-width"><template slot-scope="scope"><el-buttonsize="mini"type="text"icon="el-icon-edit"@click="handleUpdate(scope.row)"v-hasPermi="['wms:material:edit']">修改</el-button><el-buttonsize="mini"type="text"icon="el-icon-delete"@click="handleDelete(scope.row)"v-hasPermi="['wms:material:remove']">删除</el-button></template></el-table-column></el-table><paginationv-show="total>0":total="total":page.sync="queryParams.pageNum":limit.sync="queryParams.pageSize"@pagination="getList"/><!-- 添加或修改物料申请单对话框 --><el-dialog :title="title" :visible.sync="open" width="60%" append-to-body><el-form ref="form" :model="form" :rules="rules" label-width="auto"><el-form-item label="编号" prop="materialNo"><el-input v-model="form.materialNo" placeholder="请输入编号"/></el-form-item><el-form-item label="名称" prop="materialName"><el-input v-model="form.materialName" placeholder="请输入名称"/></el-form-item><el-form-item label="总数量" prop="amount"><el-input v-model="form.amount" placeholder="请输入总数量"/></el-form-item><el-form-item label="备注" prop="remark"><el-input v-model="form.remark" placeholder="请输入备注"/></el-form-item></el-form><div><div class="ops"><el-button type="primary" plain="plain" size="small" @click="handleLeaderAdd(2)">添加物料</el-button></div><WmsTable :data="form.details" @selection-change="handleSelectionChange" ref="wmstable" :certKey="certKey"><el-table-column type="selection" width="100" align="center"></el-table-column><el-table-column label="物料名" align="center" prop="applyMaterialName"></el-table-column><el-table-column label="物料编号" align="center" prop="applyMaterialNo"></el-table-column><el-table-column label="物料类型" align="center" prop="itemTypeName"></el-table-column><el-table-column label="数量" align="center" prop="quantity" row-key="quantity" width="150"><template slot-scope="scope"><el-input-number v-model="scope.row.planQuantity"  @change="recalculateTotal" placeholder="计划数量" :min="1" size="small"  :max="2147483647"></el-input-number></template></el-table-column><el-table-column label="操作" align="center"><template slot-scope="scope"><a class="red" @click="form.details.splice(scope.$index, 1)">删除</a></template></el-table-column></WmsTable></div><div slot="footer" class="dialog-footer"><el-button :loading="buttonLoading" type="primary" @click="submitForm">确 定</el-button><el-button @click="cancel">取 消</el-button></div></el-dialog><el-dialog :visible="modalObj.show" :title="modalObj.title" :width="modalObj.width" @close="modalObj.cancel"><template v-if="modalObj.component === 'add-item'"><item-select ref="item-select" :data="this.form.details"></item-select></template><span slot="footer"><el-button v-if="modalObj.cancel" @click="modalObj.cancel">取消</el-button><el-button v-if="modalObj.ok" type="primary" @click="modalObj.ok">确认</el-button></span></el-dialog><!-- 添加 用户对话框 --><el-dialog title="选择负责人" :visible.sync="leaderOpen" width="50%" append-to-body destroy-on-close :key="leaderOpen"><el-row :gutter="20"><el-col :span="24" :xs="24"><div class="relatedRoleDIv"><el-form :model="roleRelateObj" ref="form" :inline="true" v-show="showSearch" label-width="68px"><el-form-item label="姓名" prop="realName"><el-inputv-model="roleRelateObj.realName"placeholder="请输入姓名"clearablesize="small"style="width: 240px"@keyup.enter.native="getListItem"/></el-form-item><el-form-item label="手机号码" prop="phonenumber"><el-input v-model="roleRelateObj.phonenumber" placeholder="请输入手机号码" clearable size="small"style="width: 240px" @keyup.enter.native="getListItem"/></el-form-item><el-form-item><el-button type="primary" icon="el-icon-search" size="mini" @click="getListItem">搜索</el-button><el-button icon="el-icon-refresh" size="mini" @click="resetQuery2">重置</el-button></el-form-item></el-form><el-table :data="userList" style="height: 484px" @selection-change="handleSelectionChange2"><template v-if="addType == 1"><el-table-column align="center" width="65" :type="addType == 1 ? '' : 'selection'"><template scope="scope"><el-radio :label="scope.$index" v-model="radio" @change.native="getCurrentRow(scope.row)">{{ `` }}</el-radio></template></el-table-column></template><el-table-column type="selection" width="55" v-if="addType == 2"></el-table-column><el-table-column label="物料名"   prop="applyMaterialName"/><el-table-column label="物料编号"  prop="applyMaterialNo" :show-overflow-tooltip="true"/><el-table-column label="物料类型" align="center"  prop="itemTypeName"  /><el-table-column label="计量单位" align="center"  prop="unitName"  /></el-table><paginationv-show="total2 > 0" :total="total2" :page.sync="roleRelateObj.pageNum":limit.sync="roleRelateObj.pageSize"@pagination="getListItem"/><div style="height: 35px;margin-top:40px;display: flex;    justify-content: flex-end;"><el-button :loading="buttonLoading" type="primary" @click="submitLeaderForm">确 定</el-button><el-button @click="leaderOpen = false">取 消</el-button></div></div></el-col></el-row></el-dialog></div>
</template><script>
import {listMaterial, getMaterial, delMaterial, addMaterial, updateMaterial} from "@/api/wms/material";
import {randomId} from '@/utils/RandomUtils'
import {listUser} from "../../../api/system/user";
import { listItem, getItem, delItem, addItem, updateItem } from "@/api/wms/item";export default {name: "Material",data() {return {certKey: "",radio: "",leaderOpen: false,userList: [],templateSelection2: [],checkList: [],roleRelateObj: {},addType: "",total2: 0,modalObj: {show: false,title: '',width: '50%',component: null,model: {},ok: () => {},cancel: () => {}},hasSupplier: false,// 按钮loadingbuttonLoading: false,// 遮罩层loading: true,// 选中数组ids: [],// 非单个禁用single: true,// 非多个禁用multiple: true,// 显示搜索条件showSearch: true,// 总条数total: 0,// 物料申请单表格数据materialList: [],// 弹出层标题title: "",// 是否显示弹出层open: false,// 查询参数queryParams: {pageNum: 1,pageSize: 10,materialNo: undefined,materialName: undefined,amount: undefined,status: undefined,},// 表单参数form: {},// 表单校验rules: {id: [{required: true, message: "id不能为空", trigger: "blur"}],materialNo: [{required: true, message: "编号不能为空", trigger: "blur"}],materialName: [{required: true, message: "名称不能为空", trigger: "blur"}],amount: [{required: true, message: "总数量不能为空", trigger: "blur"}],status: [{required: true, message: "1采购中2已完成采购不能为空", trigger: "change"}],remark: [{required: true, message: "备注不能为空", trigger: "blur"}],}};},created() {this.getList();this.getListItem();},methods: {//数量改变调用方法recalculateTotal() {this.certKey=!this.certKey;console.log(this.certKey)},//handleLeaderAdd(type) {this.addType = type;this.leaderOpen = true;this.getListItem();},submitLeaderForm() {console.log(this.templateSelection2)this.form.details=this.templateSelection2;this.leaderOpen = false;},getCurrentRow(row) {this.templateSelection = row;console.log(row);console.log(this.checkList);// 获取选中数据 row表示选中这一行的数据，可以从里面提取所需要的值},handleSelectionChange2(selection) {this.templateSelection2 = selection;},getListItem() {listItem().then((response) => {this.userList = response.rows;this.total2 = response.total;console.log(this.userList,);});},/** 重置按钮操作 */resetQuery2() {this.resetForm("roleRelateObj");this.handleQuery2();},/** 关联角色弹框重置按钮 */handleQuery2() {this.getListItem();},/** 查询物料申请单列表 */getList() {this.loading = true;listMaterial(this.queryParams).then(response => {this.materialList = response.rows;this.total = response.total;this.loading = false;});},// 取消按钮cancel() {this.open = false;this.reset();},// 表单重置reset() {this.form = {materialNo: 'SQ-' + randomId(),id: undefined,materialName: undefined,amount: undefined,status: undefined,delFlag: undefined,remark: undefined,createBy: undefined,createTime: undefined,updateBy: undefined,updateTime: undefined};this.resetForm("form");},/** 搜索按钮操作 */handleQuery() {this.queryParams.pageNum = 1;this.getList();},/** 重置按钮操作 */resetQuery() {this.resetForm("queryForm");this.handleQuery();},// 多选框选中数据handleSelectionChange(selection) {this.ids = selection.map(item => item.id)this.single = selection.length !== 1this.multiple = !selection.length},/** 新增按钮操作 */handleAdd() {this.reset();this.open = true;this.title = "添加物料申请单";},/** 修改按钮操作 */handleUpdate(row) {this.loading = true;this.reset();const id = row.id || this.idsgetMaterial(id).then(response => {this.loading = false;this.form = response.data;this.open = true;this.title = "修改物料申请单";});},/** 提交按钮 */submitForm() {this.$refs["form"].validate(valid => {if (valid) {this.buttonLoading = true;if (this.form.id != null) {updateMaterial(this.form).then(response => {this.$modal.msgSuccess("修改成功");this.open = false;this.getList();}).finally(() => {this.buttonLoading = false;});} else {addMaterial(this.form).then(response => {this.$modal.msgSuccess("新增成功");this.open = false;this.getList();}).finally(() => {this.buttonLoading = false;});}}});},/** 删除按钮操作 */handleDelete(row) {const ids = row.id || this.ids;this.$modal.confirm('是否确认删除物料申请单编号为"' + ids + '"的数据项？').then(() => {this.loading = true;return delMaterial(ids);}).then(() => {this.loading = false;this.getList();this.$modal.msgSuccess("删除成功");}).catch(() => {}).finally(() => {this.loading = false;});},/** 导出按钮操作 */handleExport() {this.download('wms/material/export', {...this.queryParams}, `material_${new Date().getTime()}.xlsx`)},confirmSelectItem() {const value = this.$refs['item-select'].getRightList()this.form.details = value.map(it => {return {id: it.id,prod: it,planQuantity: null,realQuantity: null,place: [],receiptOrderStatus: 0,delFlag: 0}})this.closeModal()},closeModal() {this.modalObj.show = false},showAddItem() {try {this.$refs['item-select'].initDetailsList(this.form.details)} catch (err) {}const ok = () => this.confirmSelectItem()const cancel = () => this.closeModal()this.modalObj = {show: true,title: '添加物料',width: '50%',component: 'add-item',model: {},ok,cancel}},}
};
</script>