如何刷新一个数据源(mat-table)

我正在使用一个垫子表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。在他们添加了一门语言并返回之后。我希望刷新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，我从后端再次获得用户，然后重新初始化数据源。然而，这并没有起作用，没有发生任何变化。

当前回答

this.dataSource = new MatTableDataSource<Element>(this.elements);

将这一行添加到添加或删除特定行的操作下面。

refresh() {
  this.authService.getAuthenticatedUser().subscribe((res) => {
    this.user = new MatTableDataSource<Element>(res);   
  });
}

2018-03-09 06:52:09

其他回答

你也可以使用renderRows()方法。

@ViewChild(MatTable， {static: false}) MatTable //初始化

然后 this.table.renderRows ();

作为参考，看看这个: https://www.freakyjolly.com/angular-7-8-edit-add-delete-rows-in-material-table-with-using-dialogs-inline-row-operation/

2019-10-10 08:24:27

在Angular 9中，秘密是this.dataSource.data = this.dataSource.data;

例子:

import { MatTableDataSource } from '@angular/material/table';

dataSource: MatTableDataSource<MyObject>;

refresh(): void {
    this.applySomeModif();
    // Do what you want with dataSource

    this.dataSource.data = this.dataSource.data;
}

applySomeModif(): void {
    // add some data
    this.dataSource.data.push(new MyObject());
    // delete index number 4
    this.dataSource.data.splice(4, 0);
}

2020-06-17 15:09:03

在refresh()方法中使用ChangeDetectorRef触发变更检测在接收到新数据后，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();
    });
  }
}

2017-10-14 16:39:25

试试这个也许能帮到你

从加载用户的函数开始。

loadUser() {
    this.userService.getListOfUsers().subscribe()
        (response: any) => {
            this.dataSource = response
            this.dataSource.paginator = this.paginator;
        }

}

定义刷新函数，用于删除用户后刷新表。

refresh() {
    this.loadUser();
    this.dataSource.data = [...this.dataSource.data];
    this.dataSource.paginator = this.paginator;
}

现在，您可以在删除用户进程后调用refresh()函数，如下所示。

deleteUser() {
    ...... 
    this.refresh()
}

2021-03-22 11:22:52

这招对我很管用:

refreshTableSorce() {
    this.dataSource = new MatTableDataSource<Element>(this.newSource);
}

2018-10-28 01:52:08

如何刷新一个数据源(mat-table)

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