应用场景是这样
主表格的数据是所有的学校
然后点击展开的时候,获取学校下相应班级的数据
并且班级要能选择后生成图表,但所有的班级最多选择5个
首先是嵌套表格
<div><el-table:data="tableDisplayData"id="chartTableExpand"style="width: 100%"ref="chartTable"@expand-change="handleRowClick":expand-row-keys="expandedRows":row-key="getRowKeys"><el-table-column type="expand"><template slot-scope="scope"><el-table:ref="'expandTable' + scope.row.id":data="scope.row.tableExpandData"style="width: 100%"v-loading="expandLoading"@selection-change="(val) => {return handleExpandSelectionChange(val, scope.row.id);}"><el-table-column:selectable="(row) => {return checkSelectable(row, 'id');}"type="selection"></el-table-column><el-table-columnprop="className"label="班级名称"width="180"fixed="left"><template slot-scope="scope"><span>{{ scope.row.Name }}</span></template></el-table-column><el-table-column prop="studentCount" label="学生数量"><template slot-scope="scope"><span>{{ scope.row.StudentCount }}</span></template></el-table-column><el-table-column prop="answerCount" label="回答数量"><template slot-scope="scope"><span>{{ scope.row.AnswerCount }}</span></template></el-table-column></el-table></template></el-table-column><el-table-column prop="schoolName" label="学校名"><template slot-scope="scope"><span>{{ scope.row.schoolName }}</span></template></el-table-column><el-table-column prop="classCount" label="班级数量"><template slot-scope="scope"><span>{{ scope.row.classCount }}</span></template></el-table-column><el-table-column prop="status" label="时间"><template slot-scope="scope"><span>{{ scope.row.date }}</span></template></el-table-column><el-table-column prop="search"><template slot="header" slot-scope="scope"><el-input v-model="searchKey" size="medium" placeholder="Search" /></template><template slot-scope="scope"> </template></el-table-column></el-table></div>
在主表格type为expand的行(<el-table-column type="expand">
)下面添加子表格,并且添加方法
@selection-change="(val) => {return handleExpandSelectionChange(val, scope.row.id); }"
传入主表格row的数据和row的id
在方法handleExpandSelectionChange中,将 multipleSelection的值对应相应的table存起来,也就是说一个table 对应它自己的 multipleSelection,键是tableId ;值是每个table自己的multipleSelection,这样能解决多个table共用一个multipleSelection时会出现前一个子table选中的值会被后一个子table选中的值替换掉的问题
handleExpandSelectionChange(val, tableId) {let _this = this;// 如果是表格展开时去点击的话,就不要改变selections的值if (!_this.isClassTableExpanded) {// 这里将 multipleSelection的值对应相应的table存起来// 也就是说一个table 对应它自己的 multipleSelection// 键是tableId 值是 multipleSelection_this.selections[tableId] = val;}_this.updateMultipleSelection();},
在方法updateMultipleSelection中,会将各个表格的multipleSelection汇总,形成一个总的multipleSelection,再根据这个汇总的multipleSelection进行后面的处理
updateMultipleSelection() {let _this = this;// 把selections里的row取出来汇总_this.multipleSelection = [].concat.apply([],Object.keys(_this.selections).map(function (key) {return _this.selections[key];}));// 用汇总后的multipleSelection来生成图表},
然后再看主表格的展开时触发的方法
@expand-change="handleRowClick"
在handleRowClick方法中
通过方法getExpandClassData中获取数据
// 点击展开handleRowClick(row,rows) {let _this = this;_this.getExpandClassData(row,rows);},// 获取学校或班级汇总数据async getExpandClassData(row,rows) {let _this = this;let schoolId = row.id// 展开class table对应的reflet expandTable = "expandTable" + schoolId;// table展开时,根据之前选中的选项通过toggleRowSelection点击checkbox_this.$nextTick(function () {if (_this.$refs[expandTable]) {let hasSelections =_this.selections.length > 0 ||_this.selections[schoolId] ||(_this.selections[schoolId]? _this.selections[schoolId].length: undefined) > 0;if (hasSelections) {_this.isClassTableExpanded = true;let selectedIds = _this.selections[schoolId].map((mSelect) => mSelect.id);row.tableExpandData.forEach((row) => {if (selectedIds.includes(row.id)) {_this.$refs[expandTable].toggleRowSelection(row, true);}});}}_this.isClassTableExpanded = false;});const delIndex = _this.expandedRows.findIndex((item)=>{return item === schoolId});if (delIndex > -1) {_this.expandedRows.splice(delIndex, 1);}const isRowNowExpand = rows.some(r => r.id === row.id) // 判断当前行展开状态if (isRowNowExpand) {_this.expandedRows = [schoolId,..._this.expandedRows];}// 如果已经展开获取或数据了,就返回不要再获取了if (row.isExpanded) {return;}_this.expandLoading = true;await _this.getClassList(row.id);// 将school下对应的class表格数据,赋值到相应的school下// 作为tableExpandData存起来_this.$nextTick(() => {_this.$set(row, "tableExpandData", _this.tableExpandData);_this.$set(row, "isExpanded", true);_this.expandLoading = false;});},
注意在上面代码中
通过await _this.getClassList(row.id);
获取到班级数据
然后将数据赋值给对应的row
_this.$nextTick(() => {_this.$set(row, "tableExpandData", _this.tableExpandData);_this.$set(row, "isExpanded", true);_this.expandLoading = false;});
但这里会产生一个问题,用$set赋值后,页面会重新渲染,展开的table会收回去,我的想法是让展开的table保持展开的状态,
这里使用到的就是:expand-row-keys="expandedRows"
首先在主表格中添加
<el-table...:expand-row-keys="expandedRows":row-key="getRowKeys">
注意一定要设置row-key
然后在下面代码里
const delIndex = _this.expandedRows.findIndex((item)=>{return item === schoolId});
if (delIndex > -1) {_this.expandedRows.splice(delIndex, 1);
}const isRowNowExpand = rows.some(r => r.id === row.id) // 判断当前行展开状态
if (isRowNowExpand) {_this.expandedRows = [schoolId,..._this.expandedRows];
}
首先要将_this.expandedRows中对应主表展开行的数据清除掉
然后通过const isRowNowExpand = rows.some(r => r.id === row.id)
判断当前行是否展开
如果展开就把当前行添加到expandedRows 中,那样页面刷新后会保持展开状态
在getExpandClassData这个方法里还要注意的是
首先对展开的子table设置对应的ref
let expandTable = "expandTable" + schoolId;
然后,因为选中子table的单选框后,把展开的子table收齐再展开时,单选框的选中样式会丢失,这时我想的办法是根据之前选中的选项,调用toggleRowSelection这个方法,再把单选框选中
// table展开时,根据之前选中的选项通过toggleRowSelection点击checkbox_this.$nextTick(function () {if (_this.$refs[expandTable]) {let hasSelections =_this.selections.length > 0 ||_this.selections[schoolId] ||(_this.selections[schoolId]? _this.selections[schoolId].length: undefined) > 0;if (hasSelections) {_this.isClassTableExpanded = true;let selectedIds = _this.selections[schoolId].map((mSelect) => mSelect.id);row.tableExpandData.forEach((row) => {if (selectedIds.includes(row.id)) {_this.$refs[expandTable].toggleRowSelection(row, true);}});}}_this.isClassTableExpanded = false;});
在上面代码中hasSelections 是判断是否有选中的选项,然后把展开子表格选中的id取出来,根据选中的id调用toggleRowSelection去点击
然后如果已经展开获取过数据了,就返回不要再调用接口获取了
if (row.isExpanded) {return;}
最后要限制选中的数量,就通过下面的方法
在展开的子表格中单选框对应的行中 添加:selectable
<el-table-column:selectable="(row) => {return checkSelectable(row, 'id'); }"type="selection">
然后checkSelectable方法的实现如下:
// 是否禁用多选
checkSelectable: function (row, key) {let _this = this;let flag = true;// 多选最多选 banNumber 个if (_this.multipleSelection.length >= _this.banNumber) {if (!Array.isArray(row)) {flag = _this.multipleSelection.some((selection) => row[key] === selection[key]);}}return flag;
},
然后通过banNumber 控制限制的数量
最后还有一个搜索方法
watch: {searchKey: function (val) {this.tableDisplayData = this.filterTableData.filter(function (data) {return data.schoolName.toLowerCase().includes(val.toLowerCase());});},},
完整代码如下:
<template><div><el-table:data="tableDisplayData"id="chartTableExpand"style="width: 100%"ref="chartTable"@expand-change="handleRowClick":expand-row-keys="expandedRows":row-key="getRowKeys"><el-table-column type="expand"><template slot-scope="scope"><el-table:ref="'expandTable' + scope.row.id":data="scope.row.tableExpandData"style="width: 100%"v-loading="expandLoading"@selection-change="(val) => {return handleExpandSelectionChange(val, scope.row.id);}"><el-table-column:selectable="(row) => {return checkSelectable(row, 'id');}"type="selection"></el-table-column><el-table-columnprop="className"label="班级名称"width="180"fixed="left"><template slot-scope="scope"><span>{{ scope.row.Name }}</span></template></el-table-column><el-table-column prop="studentCount" label="学生数量"><template slot-scope="scope"><span>{{ scope.row.StudentCount }}</span></template></el-table-column><el-table-column prop="answerCount" label="回答数量"><template slot-scope="scope"><span>{{ scope.row.AnswerCount }}</span></template></el-table-column></el-table></template></el-table-column><el-table-column prop="schoolName" label="学校名"><template slot-scope="scope"><span>{{ scope.row.schoolName }}</span></template></el-table-column><el-table-column prop="classCount" label="班级数量"><template slot-scope="scope"><span>{{ scope.row.classCount }}</span></template></el-table-column><el-table-column prop="status" label="时间"><template slot-scope="scope"><span>{{ scope.row.date }}</span></template></el-table-column><el-table-column prop="search"><template slot="header" slot-scope="scope"><el-input v-model="searchKey" size="medium" placeholder="Search" /></template><template slot-scope="scope"> </template></el-table-column></el-table></div>
</template><script>
import { getClassData, getSchoolData } from "@/api/api";
export default {name: "embededTable",props: {tooltip: {type: String,default: "",},},data() {return {multipleSelection: [],selections: [],banNumber: 5,isTableSelected: false,tableExpandData: [],filterTableData: [],searchKey: "",tableDisplayData: [],isClassTableExpanded: false,expandedRows: [],expandLoading: false,};},async created() {let _this = this;await _this.getData();},mounted() {let _this = this;},watch: {searchKey: function (val) {this.tableDisplayData = this.filterTableData.filter(function (data) {return data.schoolName.toLowerCase().includes(val.toLowerCase());});},},components: {},methods: {getRowKeys: function (row) {return row.id;},async getClassList(id) {let _this = this;await getClassData(id).then((res) => {_this.tableExpandData = res;}).catch((err) => {console.log(err, "err");});},async getSchoolList() {let _this = this;await getSchoolData().then((res) => {_this.tableData = res;_this.filterTableData = _this.tableData;_this.tableDisplayData = _this.tableData;}).catch((err) => {console.log(err, "err");});},async getData() {let _this = this;await _this.getSchoolList();},// 点击展开handleRowClick(row,rows) {let _this = this;_this.getExpandClassData(row,rows);},// 获取学校或班级汇总数据async getExpandClassData(row,rows) {let _this = this;let schoolId = row.id// 展开class table对应的reflet expandTable = "expandTable" + schoolId;// table展开时,根据之前选中的选项通过toggleRowSelection点击checkbox_this.$nextTick(function () {if (_this.$refs[expandTable]) {let hasSelections =_this.selections.length > 0 ||_this.selections[schoolId] ||(_this.selections[schoolId]? _this.selections[schoolId].length: undefined) > 0;if (hasSelections) {_this.isClassTableExpanded = true;let selectedIds = _this.selections[schoolId].map((mSelect) => mSelect.id);row.tableExpandData.forEach((row) => {if (selectedIds.includes(row.id)) {_this.$refs[expandTable].toggleRowSelection(row, true);}});}}_this.isClassTableExpanded = false;});const delIndex = _this.expandedRows.findIndex((item)=>{return item === schoolId});if (delIndex > -1) {_this.expandedRows.splice(delIndex, 1);}const isRowNowExpand = rows.some(r => r.id === row.id) // 判断当前行展开状态if (isRowNowExpand) {_this.expandedRows = [schoolId,..._this.expandedRows];}console.log(_this.expandedRows)// 如果已经展开获取或数据了,就返回不要再获取了if (row.isExpanded) {return;}_this.expandLoading = true;await _this.getClassList(row.id);// 将school下对应的class表格数据,赋值到相应的school下// 作为tableExpandData存起来// row.tableExpandData = _this.tableExpandData;// row.isExpanded = true;_this.$nextTick(() => {_this.$set(row, "tableExpandData", _this.tableExpandData);_this.$set(row, "isExpanded", true);// _this.expandedRows = [schoolId,..._this.expandedRows];_this.expandLoading = false;});},// 单选handleExpandSelectionChange(val, tableId) {let _this = this;// 如果是表格展开时去点击的话,就不要改变selections的值if (!_this.isClassTableExpanded) {// 这里将 multipleSelection的值对应相应的table存起来// 也就是说一个table 对应它自己的 multipleSelection// 键是tableId 值是 multipleSelection_this.selections[tableId] = val;}_this.updateMultipleSelection();},updateMultipleSelection() {let _this = this;// 把selections里的row取出来汇总_this.multipleSelection = [].concat.apply([],Object.keys(_this.selections).map(function (key) {return _this.selections[key];}));},// 是否禁用多选checkSelectable: function (row, key) {let _this = this;let flag = true;// 多选最多选 banNumber 个if (_this.multipleSelection.length >= _this.banNumber) {if (!Array.isArray(row)) {flag = _this.multipleSelection.some((selection) => row[key] === selection[key]);}}return flag;},},
};
</script><!-- Add "scoped" attribute to limit CSS to this component only -->
<style>
/* 去掉全选按钮 */
.el-table__fixed-header-wrapper .el-table__header th .el-checkbox .el-checkbox__input .el-checkbox__inner{display: none;
}
</style>
效果图如下: