当行数小于设定数量时，将空行添加到 Angular Material table？
Adding empty rows to Angular Material table when rows are less than a set number?
我有两个 angular tables，我正在并排比较它们的数据，假设我有默认的 10 行显示在两个 tables 上，它可以如果两个 table 的行数少于 10 行。例如，一个 table 有 10 行，第二个只有 1 行，所以第二个 table 仅在 1 行结束，我想做的是有一些空行（应该存在的行数- 实际存在的行数）。我该怎么做？
我的第一个table
test-table.component.html
<div class="mat-elevation-z8">
<table mat-table class="full-width-table" matSort aria-label="Elements">
<!-- Id Column -->
<ng-container matColumnDef="id">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Id</th>
<td mat-cell *matCellDef="let row">{{row.id}}</td>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Name</th>
<td mat-cell *matCellDef="let row">{{row.name}}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
<mat-paginator #paginator
[length]="dataSource?.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
</div>
这个
的数据源文件
test-table-datasource.ts
import { DataSource } from '@angular/cdk/collections';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { map } from 'rxjs/operators';
import { Observable, of as observableOf, merge } from 'rxjs';
// TODO: Replace this with your own data model type
export interface TestTableItem {
name: string;
id: number;
}
// TODO: replace this with real data from your application
const EXAMPLE_DATA: TestTableItem[] = [
{id: 1, name: 'Hydrogen'},
{id: 2, name: 'Helium'},
{id: 3, name: 'Lithium'},
{id: 4, name: 'Beryllium'},
{id: 5, name: 'Boron'},
{id: 6, name: 'Carbon'},
{id: 7, name: 'Nitrogen'},
{id: 8, name: 'Oxygen'},
{id: 9, name: 'Fluorine'},
{id: 10, name: 'Neon'},
{id: 11, name: 'Sodium'},
{id: 12, name: 'Magnesium'},
{id: 13, name: 'Aluminum'},
{id: 14, name: 'Silicon'},
{id: 15, name: 'Phosphorus'},
{id: 16, name: 'Sulfur'},
{id: 17, name: 'Chlorine'},
{id: 18, name: 'Argon'},
{id: 19, name: 'Potassium'},
{id: 20, name: 'Calcium'},
];
/**
* Data source for the TestTable view. This class should
* encapsulate all logic for fetching and manipulating the displayed data
* (including sorting, pagination, and filtering).
*/
export class TestTableDataSource extends DataSource<TestTableItem> {
data: TestTableItem[] = EXAMPLE_DATA;
paginator: MatPaginator;
sort: MatSort;
constructor() {
super();
}
/**
* Connect this data source to the table. The table will only update when
* the returned stream emits new items.
* @returns A stream of the items to be rendered.
*/
connect(): Observable<TestTableItem[]> {
// Combine everything that affects the rendered data into one update
// stream for the data-table to consume.
const dataMutations = [
observableOf(this.data),
this.paginator.page,
this.sort.sortChange
];
return merge(...dataMutations).pipe(map(() => {
return this.getPagedData(this.getSortedData([...this.data]));
}));
}
/**
* Called when the table is being destroyed. Use this function, to clean up
* any open connections or free any held resources that were set up during connect.
*/
disconnect() {}
/**
* Paginate the data (client-side). If you're using server-side pagination,
* this would be replaced by requesting the appropriate data from the server.
*/
private getPagedData(data: TestTableItem[]) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
return data.splice(startIndex, this.paginator.pageSize);
}
/**
* Sort the data (client-side). If you're using server-side sorting,
* this would be replaced by requesting the appropriate data from the server.
*/
private getSortedData(data: TestTableItem[]) {
if (!this.sort.active || this.sort.direction === '') {
return data;
}
return data.sort((a, b) => {
const isAsc = this.sort.direction === 'asc';
switch (this.sort.active) {
case 'name': return compare(a.name, b.name, isAsc);
case 'id': return compare(+a.id, +b.id, isAsc);
default: return 0;
}
});
}
}
/** Simple sort comparator for example ID/Name columns (for client-side sorting). */
function compare(a: string | number, b: string | number, isAsc: boolean) {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}
test-table.component.ts
import { AfterViewInit, Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTable } from '@angular/material/table';
import { TestTableDataSource, TestTableItem } from './test-table-datasource';
@Component({
selector: 'app-test-table',
templateUrl: './test-table.component.html',
styleUrls: ['./test-table.component.css']
})
export class TestTableComponent implements AfterViewInit, OnInit {
@ViewChild(MatPaginator) paginator: MatPaginator;
@ViewChild(MatSort) sort: MatSort;
@ViewChild(MatTable) table: MatTable<TestTableItem>;
dataSource: TestTableDataSource;
/** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
displayedColumns = ['id', 'name'];
ngOnInit() {
this.dataSource = new TestTableDataSource();
}
ngAfterViewInit() {
this.dataSource.sort = this.sort;
this.dataSource.paginator = this.paginator;
this.table.dataSource = this.dataSource;
}
}
我的第二个Table
sample-table.component.html
<div class="mat-elevation-z8">
<table mat-table class="full-width-table" matSort aria-label="Elements">
<!-- Id Column -->
<ng-container matColumnDef="id">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Id</th>
<td mat-cell *matCellDef="let row">{{row.id}}</td>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Name</th>
<td mat-cell *matCellDef="let row">{{row.name}}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
<mat-paginator #paginator
[length]="dataSource?.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
</div>
sample-table-datasource.ts
import { DataSource } from '@angular/cdk/collections';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { map } from 'rxjs/operators';
import { Observable, of as observableOf, merge } from 'rxjs';
// TODO: Replace this with your own data model type
export interface SampleTableItem {
name: string;
id: number;
}
// TODO: replace this with real data from your application
const EXAMPLE_DATA: SampleTableItem[] = [
{id: 1, name: 'Hydrogen'},
{id: 2, name: 'Helium'},
{id: 3, name: 'Lithium'},
{id: 4, name: 'Beryllium'},
{id: 5, name: 'Boron'},
{id: 6, name: 'Carbon'},
{id: 7, name: 'Nitrogen'},
{id: 8, name: 'Oxygen'},
{id: 9, name: 'Fluorine'},
{id: 10, name: 'Neon'},
{id: 11, name: 'Sodium'},
{id: 12, name: 'Magnesium'},
{id: 13, name: 'Aluminum'},
{id: 14, name: 'Silicon'},
{id: 15, name: 'Phosphorus'},
{id: 16, name: 'Sulfur'},
{id: 17, name: 'Chlorine'},
{id: 18, name: 'Argon'},
{id: 19, name: 'Potassium'},
{id: 20, name: 'Calcium'},
];
/**
* Data source for the SampleTable view. This class should
* encapsulate all logic for fetching and manipulating the displayed data
* (including sorting, pagination, and filtering).
*/
export class SampleTableDataSource extends DataSource<SampleTableItem> {
data: SampleTableItem[] = EXAMPLE_DATA;
paginator: MatPaginator;
sort: MatSort;
constructor() {
super();
}
/**
* Connect this data source to the table. The table will only update when
* the returned stream emits new items.
* @returns A stream of the items to be rendered.
*/
connect(): Observable<SampleTableItem[]> {
// Combine everything that affects the rendered data into one update
// stream for the data-table to consume.
const dataMutations = [
observableOf(this.data),
this.paginator.page,
this.sort.sortChange
];
return merge(...dataMutations).pipe(map(() => {
return this.getPagedData(this.getSortedData([...this.data]));
}));
}
/**
* Called when the table is being destroyed. Use this function, to clean up
* any open connections or free any held resources that were set up during connect.
*/
disconnect() {}
/**
* Paginate the data (client-side). If you're using server-side pagination,
* this would be replaced by requesting the appropriate data from the server.
*/
private getPagedData(data: SampleTableItem[]) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
return data.splice(startIndex, this.paginator.pageSize);
}
/**
* Sort the data (client-side). If you're using server-side sorting,
* this would be replaced by requesting the appropriate data from the server.
*/
private getSortedData(data: SampleTableItem[]) {
if (!this.sort.active || this.sort.direction === '') {
return data;
}
return data.sort((a, b) => {
const isAsc = this.sort.direction === 'asc';
switch (this.sort.active) {
case 'name': return compare(a.name, b.name, isAsc);
case 'id': return compare(+a.id, +b.id, isAsc);
default: return 0;
}
});
}
}
/** Simple sort comparator for example ID/Name columns (for client-side sorting). */
function compare(a: string | number, b: string | number, isAsc: boolean) {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}
sample-table.component.ts
import { AfterViewInit, Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTable } from '@angular/material/table';
import { SampleTableDataSource, SampleTableItem } from './sample-table-datasource';
@Component({
selector: 'app-sample-table',
templateUrl: './sample-table.component.html',
styleUrls: ['./sample-table.component.css']
})
export class SampleTableComponent implements AfterViewInit, OnInit {
@ViewChild(MatPaginator) paginator: MatPaginator;
@ViewChild(MatSort) sort: MatSort;
@ViewChild(MatTable) table: MatTable<SampleTableItem>;
dataSource: SampleTableDataSource;
/** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
displayedColumns = ['id', 'name'];
ngOnInit() {
this.dataSource = new SampleTableDataSource();
}
ngAfterViewInit() {
this.dataSource.sort = this.sort;
this.dataSource.paginator = this.paginator;
this.table.dataSource = this.dataSource;
}
}
app-compoenent.html
<div class="row">
<div class="col">
<h3>Table 1</h3>
<app-test-table></app-test-table>
</div>
<div class="col">
<h3>Table 2 </h3>
<app-sample-table></app-sample-table>
</div>
</div>
如何动态添加空行？
如果您要使用 <mat-table> 而不是 <table>，我们可以将数据源表示为 <mat-table [dataSource]="dataSource"> 并向其中插入空对象。尝试以下
控制器
this.dataSource = new MatTableDataSource<any>(this.inputData);
const length = 10 - this.dataSource._data._value.length;
for (let i = 0; i < length; i++) {
this.dataSource._data._value.push(Object.create(null));
}
模板
<div class="mat-elevation-z8">
<mat-table [dataSource]="dataSource" class="full-width-table" matSort aria-label="Elements">
...
</mat-table>
...
</div>
我使用常量 10 来展示行为。要同步两个组件之间的实际长度，您可以设置允许数据通过子组件的单例服务b/n。
好的，我想通了，这是正确答案
在test-table-datasource.ts
将以下内容添加到 getPagedData 方法
private getPagedData(data: TestTableItem[]) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
if( data.length - startIndex < this.paginator.pageSize ){
let diff = this.paginator.pageSize -(data.length - startIndex)
for(let i=0 ; i<diff;i++){
data.push(Object.create(null));
}
}
return data.splice(startIndex, this.paginator.pageSize);
}
这会将空行添加到数据源，这实际上不会永久更改您的数据，因为它会根据 pageSize 添加空行。
我有两个 angular tables，我正在并排比较它们的数据，假设我有默认的 10 行显示在两个 tables 上，它可以如果两个 table 的行数少于 10 行。例如，一个 table 有 10 行，第二个只有 1 行，所以第二个 table 仅在 1 行结束，我想做的是有一些空行（应该存在的行数- 实际存在的行数）。我该怎么做？
我的第一个table
test-table.component.html
<div class="mat-elevation-z8">
<table mat-table class="full-width-table" matSort aria-label="Elements">
<!-- Id Column -->
<ng-container matColumnDef="id">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Id</th>
<td mat-cell *matCellDef="let row">{{row.id}}</td>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Name</th>
<td mat-cell *matCellDef="let row">{{row.name}}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
<mat-paginator #paginator
[length]="dataSource?.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
</div>
这个
的数据源文件test-table-datasource.ts
import { DataSource } from '@angular/cdk/collections';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { map } from 'rxjs/operators';
import { Observable, of as observableOf, merge } from 'rxjs';
// TODO: Replace this with your own data model type
export interface TestTableItem {
name: string;
id: number;
}
// TODO: replace this with real data from your application
const EXAMPLE_DATA: TestTableItem[] = [
{id: 1, name: 'Hydrogen'},
{id: 2, name: 'Helium'},
{id: 3, name: 'Lithium'},
{id: 4, name: 'Beryllium'},
{id: 5, name: 'Boron'},
{id: 6, name: 'Carbon'},
{id: 7, name: 'Nitrogen'},
{id: 8, name: 'Oxygen'},
{id: 9, name: 'Fluorine'},
{id: 10, name: 'Neon'},
{id: 11, name: 'Sodium'},
{id: 12, name: 'Magnesium'},
{id: 13, name: 'Aluminum'},
{id: 14, name: 'Silicon'},
{id: 15, name: 'Phosphorus'},
{id: 16, name: 'Sulfur'},
{id: 17, name: 'Chlorine'},
{id: 18, name: 'Argon'},
{id: 19, name: 'Potassium'},
{id: 20, name: 'Calcium'},
];
/**
* Data source for the TestTable view. This class should
* encapsulate all logic for fetching and manipulating the displayed data
* (including sorting, pagination, and filtering).
*/
export class TestTableDataSource extends DataSource<TestTableItem> {
data: TestTableItem[] = EXAMPLE_DATA;
paginator: MatPaginator;
sort: MatSort;
constructor() {
super();
}
/**
* Connect this data source to the table. The table will only update when
* the returned stream emits new items.
* @returns A stream of the items to be rendered.
*/
connect(): Observable<TestTableItem[]> {
// Combine everything that affects the rendered data into one update
// stream for the data-table to consume.
const dataMutations = [
observableOf(this.data),
this.paginator.page,
this.sort.sortChange
];
return merge(...dataMutations).pipe(map(() => {
return this.getPagedData(this.getSortedData([...this.data]));
}));
}
/**
* Called when the table is being destroyed. Use this function, to clean up
* any open connections or free any held resources that were set up during connect.
*/
disconnect() {}
/**
* Paginate the data (client-side). If you're using server-side pagination,
* this would be replaced by requesting the appropriate data from the server.
*/
private getPagedData(data: TestTableItem[]) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
return data.splice(startIndex, this.paginator.pageSize);
}
/**
* Sort the data (client-side). If you're using server-side sorting,
* this would be replaced by requesting the appropriate data from the server.
*/
private getSortedData(data: TestTableItem[]) {
if (!this.sort.active || this.sort.direction === '') {
return data;
}
return data.sort((a, b) => {
const isAsc = this.sort.direction === 'asc';
switch (this.sort.active) {
case 'name': return compare(a.name, b.name, isAsc);
case 'id': return compare(+a.id, +b.id, isAsc);
default: return 0;
}
});
}
}
/** Simple sort comparator for example ID/Name columns (for client-side sorting). */
function compare(a: string | number, b: string | number, isAsc: boolean) {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}
test-table.component.ts
import { AfterViewInit, Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTable } from '@angular/material/table';
import { TestTableDataSource, TestTableItem } from './test-table-datasource';
@Component({
selector: 'app-test-table',
templateUrl: './test-table.component.html',
styleUrls: ['./test-table.component.css']
})
export class TestTableComponent implements AfterViewInit, OnInit {
@ViewChild(MatPaginator) paginator: MatPaginator;
@ViewChild(MatSort) sort: MatSort;
@ViewChild(MatTable) table: MatTable<TestTableItem>;
dataSource: TestTableDataSource;
/** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
displayedColumns = ['id', 'name'];
ngOnInit() {
this.dataSource = new TestTableDataSource();
}
ngAfterViewInit() {
this.dataSource.sort = this.sort;
this.dataSource.paginator = this.paginator;
this.table.dataSource = this.dataSource;
}
}
我的第二个Table
sample-table.component.html
<div class="mat-elevation-z8">
<table mat-table class="full-width-table" matSort aria-label="Elements">
<!-- Id Column -->
<ng-container matColumnDef="id">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Id</th>
<td mat-cell *matCellDef="let row">{{row.id}}</td>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef mat-sort-header>Name</th>
<td mat-cell *matCellDef="let row">{{row.name}}</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
<mat-paginator #paginator
[length]="dataSource?.data.length"
[pageIndex]="0"
[pageSize]="50"
[pageSizeOptions]="[25, 50, 100, 250]">
</mat-paginator>
</div>
sample-table-datasource.ts
import { DataSource } from '@angular/cdk/collections';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { map } from 'rxjs/operators';
import { Observable, of as observableOf, merge } from 'rxjs';
// TODO: Replace this with your own data model type
export interface SampleTableItem {
name: string;
id: number;
}
// TODO: replace this with real data from your application
const EXAMPLE_DATA: SampleTableItem[] = [
{id: 1, name: 'Hydrogen'},
{id: 2, name: 'Helium'},
{id: 3, name: 'Lithium'},
{id: 4, name: 'Beryllium'},
{id: 5, name: 'Boron'},
{id: 6, name: 'Carbon'},
{id: 7, name: 'Nitrogen'},
{id: 8, name: 'Oxygen'},
{id: 9, name: 'Fluorine'},
{id: 10, name: 'Neon'},
{id: 11, name: 'Sodium'},
{id: 12, name: 'Magnesium'},
{id: 13, name: 'Aluminum'},
{id: 14, name: 'Silicon'},
{id: 15, name: 'Phosphorus'},
{id: 16, name: 'Sulfur'},
{id: 17, name: 'Chlorine'},
{id: 18, name: 'Argon'},
{id: 19, name: 'Potassium'},
{id: 20, name: 'Calcium'},
];
/**
* Data source for the SampleTable view. This class should
* encapsulate all logic for fetching and manipulating the displayed data
* (including sorting, pagination, and filtering).
*/
export class SampleTableDataSource extends DataSource<SampleTableItem> {
data: SampleTableItem[] = EXAMPLE_DATA;
paginator: MatPaginator;
sort: MatSort;
constructor() {
super();
}
/**
* Connect this data source to the table. The table will only update when
* the returned stream emits new items.
* @returns A stream of the items to be rendered.
*/
connect(): Observable<SampleTableItem[]> {
// Combine everything that affects the rendered data into one update
// stream for the data-table to consume.
const dataMutations = [
observableOf(this.data),
this.paginator.page,
this.sort.sortChange
];
return merge(...dataMutations).pipe(map(() => {
return this.getPagedData(this.getSortedData([...this.data]));
}));
}
/**
* Called when the table is being destroyed. Use this function, to clean up
* any open connections or free any held resources that were set up during connect.
*/
disconnect() {}
/**
* Paginate the data (client-side). If you're using server-side pagination,
* this would be replaced by requesting the appropriate data from the server.
*/
private getPagedData(data: SampleTableItem[]) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
return data.splice(startIndex, this.paginator.pageSize);
}
/**
* Sort the data (client-side). If you're using server-side sorting,
* this would be replaced by requesting the appropriate data from the server.
*/
private getSortedData(data: SampleTableItem[]) {
if (!this.sort.active || this.sort.direction === '') {
return data;
}
return data.sort((a, b) => {
const isAsc = this.sort.direction === 'asc';
switch (this.sort.active) {
case 'name': return compare(a.name, b.name, isAsc);
case 'id': return compare(+a.id, +b.id, isAsc);
default: return 0;
}
});
}
}
/** Simple sort comparator for example ID/Name columns (for client-side sorting). */
function compare(a: string | number, b: string | number, isAsc: boolean) {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}
sample-table.component.ts
import { AfterViewInit, Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTable } from '@angular/material/table';
import { SampleTableDataSource, SampleTableItem } from './sample-table-datasource';
@Component({
selector: 'app-sample-table',
templateUrl: './sample-table.component.html',
styleUrls: ['./sample-table.component.css']
})
export class SampleTableComponent implements AfterViewInit, OnInit {
@ViewChild(MatPaginator) paginator: MatPaginator;
@ViewChild(MatSort) sort: MatSort;
@ViewChild(MatTable) table: MatTable<SampleTableItem>;
dataSource: SampleTableDataSource;
/** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
displayedColumns = ['id', 'name'];
ngOnInit() {
this.dataSource = new SampleTableDataSource();
}
ngAfterViewInit() {
this.dataSource.sort = this.sort;
this.dataSource.paginator = this.paginator;
this.table.dataSource = this.dataSource;
}
}
app-compoenent.html
<div class="row">
<div class="col">
<h3>Table 1</h3>
<app-test-table></app-test-table>
</div>
<div class="col">
<h3>Table 2 </h3>
<app-sample-table></app-sample-table>
</div>
</div>
如何动态添加空行？
如果您要使用 <mat-table> 而不是 <table>，我们可以将数据源表示为 <mat-table [dataSource]="dataSource"> 并向其中插入空对象。尝试以下
控制器
this.dataSource = new MatTableDataSource<any>(this.inputData);
const length = 10 - this.dataSource._data._value.length;
for (let i = 0; i < length; i++) {
this.dataSource._data._value.push(Object.create(null));
}
模板
<div class="mat-elevation-z8">
<mat-table [dataSource]="dataSource" class="full-width-table" matSort aria-label="Elements">
...
</mat-table>
...
</div>
我使用常量 10 来展示行为。要同步两个组件之间的实际长度，您可以设置允许数据通过子组件的单例服务b/n。
好的，我想通了，这是正确答案
在test-table-datasource.ts
将以下内容添加到 getPagedData 方法
private getPagedData(data: TestTableItem[]) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
if( data.length - startIndex < this.paginator.pageSize ){
let diff = this.paginator.pageSize -(data.length - startIndex)
for(let i=0 ; i<diff;i++){
data.push(Object.create(null));
}
}
return data.splice(startIndex, this.paginator.pageSize);
}
这会将空行添加到数据源，这实际上不会永久更改您的数据，因为它会根据 pageSize 添加空行。