Angular 14| Angular Material Table渲染/刷新/更新行

Question

我的问题：我被困在棱角分明的材料桌旁。我安装了它并创建了我的第一个表。我还创建了一个函数，它应该删除最后一行，但在我更改网站或类似的东西之前，表根本不会刷新。

问题：删除/添加/编辑数据后，如何刷新表？

this.table.renderRows((；不工作

以下代码：

1. 测试表数据源.ts

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';

export interface TestTableItem {
name: string;
id: number;
}
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'},
];
export class TestTableDataSource extends DataSource<TestTableItem> {
data: TestTableItem[] = EXAMPLE_DATA;
paginator: MatPaginator | undefined;
sort: MatSort | undefined;

constructor() {
super();
}
connect(): Observable<TestTableItem[]> {
if (this.paginator && this.sort) {
// Combine everything that affects the rendered data into one update
// stream for the data-table to consume.
return merge(observableOf(this.data), this.paginator.page, this.sort.sortChange)
.pipe(map(() => {
return this.getPagedData(this.getSortedData([...this.data ]));
}));
} else {
throw Error('Please set the paginator and sort on the data source before connecting.');
}
}

private getPagedData(data: TestTableItem[]): TestTableItem[] {
if (this.paginator) {
const startIndex = this.paginator.pageIndex * this.paginator.pageSize;
return data.splice(startIndex, this.paginator.pageSize);
} else {
return data;
}
}
private getSortedData(data: TestTableItem[]): TestTableItem[] {
if (!this.sort || !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;
}
});
}
}
function compare(a: string | number, b: string | number, isAsc: boolean): number {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}

2. 测试表组件.ts

import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTable, MatTableDataSource } from '@angular/material/table';
import { TestTableDataSource, TestTableItem } from './test-table-datasource';
import {CdkTableModule} from '@angular/cdk/table';
@Component({
selector: 'app-test-table',
templateUrl: './test-table.component.html',
styleUrls: ['./test-table.component.css']
})
export class TestTableComponent implements AfterViewInit {
@ViewChild(MatPaginator) paginator!: MatPaginator;
@ViewChild(MatSort) sort!: MatSort;
@ViewChild(MatTable) table!: MatTable<TestTableItem>;
dataSource: TestTableDataSource;
displayedColumns = ['id', 'name'];
constructor() {
this.dataSource = new TestTableDataSource();
}
ngAfterViewInit(): void {
this.dataSource.sort = this.sort;
this.dataSource.paginator = this.paginator;
this.table.dataSource = this.dataSource;
}

removeData(){
console.log(this.dataSource.data.length);
this.dataSource.data.pop();
console.log(this.dataSource.data.length);
this.table.renderRows();
}
}

3. 测试表组件.html

<div>
<button (click)="removeData()">delete</button>
</div>
</div>
<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]="10"
[pageSizeOptions]="[5, 10, 20]"
aria-label="Select page">
</mat-paginator>
</div>

Answer 1

您必须制作一个EXAMPLE_DATA.pop((

然后生成this.dataSource.data=EXAMPLE_data；

这个解决方案对我来说效果很好