我使用mat-table列出用户选择的语言的内容。他们还可以使用对话框面板添加新的语言。在他们添加了一种语言并返回之后。我希望刷新我的数据源以显示他们所做的更改。
我通过从服务获取用户数据并在刷新方法中将其传递到数据源来初始化数据存储。
Language.component.ts
import { Component, OnInit } from '@angular/core';
import { LanguageModel, LANGUAGE_DATA } from '../../../../models/language.model';
import { LanguageAddComponent } from './language-add/language-add.component';
import { AuthService } from '../../../../services/auth.service';
import { LanguageDataSource } from './language-data-source';
import { LevelbarComponent } from '../../../../directives/levelbar/levelbar.component';
import { DataSource } from '@angular/cdk/collections';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import { MatSnackBar, MatDialog } from '@angular/material';
@Component({
selector: 'app-language',
templateUrl: './language.component.html',
styleUrls: ['./language.component.scss']
})
export class LanguageComponent implements OnInit {
displayedColumns = ['name', 'native', 'code', 'level'];
teachDS: any;
user: any;
constructor(private authService: AuthService, private dialog: MatDialog) { }
ngOnInit() {
this.refresh();
}
add() {
this.dialog.open(LanguageAddComponent, {
data: { user: this.user },
}).afterClosed().subscribe(result => {
this.refresh();
});
}
refresh() {
this.authService.getAuthenticatedUser().subscribe((res) => {
this.user = res;
this.teachDS = new LanguageDataSource(this.user.profile.languages.teach);
});
}
}
language-data-source.ts
import {MatPaginator, MatSort} from '@angular/material';
import {DataSource} from '@angular/cdk/collections';
import {Observable} from 'rxjs/Observable';
import 'rxjs/add/observable/merge';
import 'rxjs/add/operator/map';
export class LanguageDataSource extends DataSource<any> {
constructor(private languages) {
super();
}
connect(): Observable<any> {
return Observable.of(this.languages);
}
disconnect() {
// No-op
}
}
因此,我尝试调用一个刷新方法,在该方法中,我再次从后端获取用户,然后重新初始化数据源。但是,这不起作用,没有发生任何更改。
发布于 2017-10-15 00:39:26
在接收到新数据后,在refresh()
方法中使用ChangeDetectorRef
触发更改检测,在构造函数中注入ChangeDetectorRef,并像这样使用detectChanges:
import { Component, OnInit, ChangeDetectorRef } from '@angular/core';
import { LanguageModel, LANGUAGE_DATA } from '../../../../models/language.model';
import { LanguageAddComponent } from './language-add/language-add.component';
import { AuthService } from '../../../../services/auth.service';
import { LanguageDataSource } from './language-data-source';
import { LevelbarComponent } from '../../../../directives/levelbar/levelbar.component';
import { DataSource } from '@angular/cdk/collections';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import { MatSnackBar, MatDialog } from '@angular/material';
@Component({
selector: 'app-language',
templateUrl: './language.component.html',
styleUrls: ['./language.component.scss']
})
export class LanguageComponent implements OnInit {
displayedColumns = ['name', 'native', 'code', 'level'];
teachDS: any;
user: any;
constructor(private authService: AuthService, private dialog: MatDialog,
private changeDetectorRefs: ChangeDetectorRef) { }
ngOnInit() {
this.refresh();
}
add() {
this.dialog.open(LanguageAddComponent, {
data: { user: this.user },
}).afterClosed().subscribe(result => {
this.refresh();
});
}
refresh() {
this.authService.getAuthenticatedUser().subscribe((res) => {
this.user = res;
this.teachDS = new LanguageDataSource(this.user.profile.languages.teach);
this.changeDetectorRefs.detectChanges();
});
}
}
发布于 2018-03-12 04:29:28
我不知道创建问题时是否需要ChangeDetectorRef
,但现在已经足够了:
import { MatTableDataSource } from '@angular/material/table';
// ...
dataSource = new MatTableDataSource<MyDataType>();
refresh() {
this.myService.doSomething().subscribe((data: MyDataType[]) => {
this.dataSource.data = data;
}
}
示例:
发布于 2017-11-12 07:30:47
由于您使用的是MatPaginator
,您只需对分页器进行任何更改,这将触发数据重新加载。
简单的技巧:
this.paginator._changePageSize(this.paginator.pageSize);
这会将页面大小更新为当前页面大小,因此基本上没有任何更改,除了也调用了私有_emitPageEvent()
函数,从而触发表重新加载。
https://stackoverflow.com/questions/46746598
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