ฉันได้ทำการค้นคว้าเพิ่มเติมและพบว่าสถานที่นี้ให้สิ่งที่ฉันต้องการ - รู้สึกสะอาดและเกี่ยวข้องกับการอัปเดตข้อมูลเมื่อรีเฟรชจากเซิร์ฟเวอร์:
https://blog.angular-university.io/angular-material-data-table/
เครดิตส่วนใหญ่ไปยังหน้าด้านบน ด้านล่างนี้เป็นตัวอย่างวิธีการใช้ mat-selector เพื่ออัปเดต mat-table ที่ผูกไว้กับแหล่งข้อมูลเมื่อมีการเปลี่ยนแปลงการเลือก ฉันใช้ Angular 7 ขออภัยสำหรับความกว้างขวางพยายามทำให้สมบูรณ์ แต่กระชับ - ฉันได้ตัดส่วนที่ไม่จำเป็นออกให้มากที่สุดเท่าที่จะทำได้ โดยหวังว่าจะช่วยให้คนอื่นก้าวไปข้างหน้าได้เร็วขึ้น!
organization.model.ts:
export class Organization {
id: number;
name: String;
}
organization.service.ts:
import { Observable, empty } from 'rxjs';
import { of } from 'rxjs';
import { Organization } from './organization.model';
export class OrganizationService {
getConstantOrganizations(filter: String): Observable<Organization[]> {
if (filter === "All") {
let Organizations: Organization[] = [
{ id: 1234, name: 'Some data' }
];
return of(Organizations);
} else {
let Organizations: Organization[] = [
{ id: 5678, name: 'Some other data' }
];
return of(Organizations);
}
// ...just a sample, other filterings would go here - and of course data instead fetched from server.
}
organizationdatasource.model.ts:
import { CollectionViewer, DataSource } from '@angular/cdk/collections';
import { Observable, BehaviorSubject, of } from 'rxjs';
import { catchError, finalize } from "rxjs/operators";
import { OrganizationService } from './organization.service';
import { Organization } from './organization.model';
export class OrganizationDataSource extends DataSource<Organization> {
private organizationsSubject = new BehaviorSubject<Organization[]>([]);
private loadingSubject = new BehaviorSubject<boolean>(false);
public loading$ = this.loadingSubject.asObservable();
constructor(private organizationService: OrganizationService, ) {
super();
}
loadOrganizations(filter: String) {
this.loadingSubject.next(true);
return this.organizationService.getOrganizations(filter).pipe(
catchError(() => of([])),
finalize(() => this.loadingSubject.next(false))
).subscribe(organization => this.organizationsSubject.next(organization));
}
connect(collectionViewer: CollectionViewer): Observable<Organization[]> {
return this.organizationsSubject.asObservable();
}
disconnect(collectionViewer: CollectionViewer): void {
this.organizationsSubject.complete();
this.loadingSubject.complete();
}
}
organization.component.html:
<div class="spinner-container" *ngIf="organizationDataSource.loading$ | async">
<mat-spinner></mat-spinner>
</div>
<div>
<form [formGroup]="formGroup">
<mat-form-field fxAuto>
<div fxLayout="row">
<mat-select formControlName="organizationSelectionControl" (selectionChange)="updateOrganizationSelection()">
<mat-option *ngFor="let organizationSelectionAlternative of organizationSelectionAlternatives"
[value]="organizationSelectionAlternative">
{{organizationSelectionAlternative.name}}
</mat-option>
</mat-select>
</div>
</mat-form-field>
</form>
</div>
<mat-table fxLayout="column" [dataSource]="organizationDataSource">
<ng-container matColumnDef="name">
<mat-header-cell *matHeaderCellDef>Name</mat-header-cell>
<mat-cell *matCellDef="let organization">{{organization.name}}</mat-cell>
</ng-container>
<ng-container matColumnDef="number">
<mat-header-cell *matHeaderCellDef>Number</mat-header-cell>
<mat-cell *matCellDef="let organization">{{organization.number}}</mat-cell>
</ng-container>
<mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
<mat-row *matRowDef="let row; columns: displayedColumns"></mat-row>
</mat-table>
organization.component.scss:
.spinner-container {
height: 360px;
width: 390px;
position: fixed;
}
organization.component.ts:
import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder } from '@angular/forms';
import { Observable } from 'rxjs';
import { OrganizationService } from './organization.service';
import { Organization } from './organization.model';
import { OrganizationDataSource } from './organizationdatasource.model';
@Component({
selector: 'organizations',
templateUrl: './organizations.component.html',
styleUrls: ['./organizations.component.scss']
})
export class OrganizationsComponent implements OnInit {
public displayedColumns: string[];
public organizationDataSource: OrganizationDataSource;
public formGroup: FormGroup;
public organizationSelectionAlternatives = [{
id: 1,
name: 'All'
}, {
id: 2,
name: 'With organization update requests'
}, {
id: 3,
name: 'With contact update requests'
}, {
id: 4,
name: 'With order requests'
}]
constructor(
private formBuilder: FormBuilder,
private organizationService: OrganizationService) { }
ngOnInit() {
this.formGroup = this.formBuilder.group({
'organizationSelectionControl': []
})
const toSelect = this.organizationSelectionAlternatives.find(c => c.id == 1);
this.formGroup.get('organizationSelectionControl').setValue(toSelect);
this.organizationDataSource = new OrganizationDataSource(this.organizationService);
this.displayedColumns = ['name', 'number' ];
this.updateOrganizationSelection();
}
updateOrganizationSelection() {
this.organizationDataSource.loadOrganizations(this.formGroup.get('organizationSelectionControl').value.name);
}
}