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

我利用两种资源获得了一个很好的解决方案:

刷新dataSource和paginator:

this.dataSource.data = this.users;
this.dataSource.connect().next(this.users);
this.paginator._changePageSize(this.paginator.pageSize);

例如，dataSource定义在这里:

    users: User[];
    ...
    dataSource = new MatTableDataSource(this.users);
    ...
    this.dataSource.paginator = this.paginator;
    ...

2019-06-14 04:51:51

其他回答

在添加一个新的数据行之后，我通过更新dataSource而不使用它的实例刷新了材料表。

HTML格式的表格:

<table mat-table #table [dataSource]="myDataArray">

component.ts中的addUser():

public USER_DATA: user[] = [];


public newUser = {userName: "ABC", email: "abc@gmail.com"};
public myDataArray: any;


addUser() {
    const newUsersArray = this.USER_DATA;
    newUsersArray.push(this.newUser);
    this.myDataArray = [...newUsersArray];//refresh the dataSource
    
  }

2021-06-20 09:32:46

import { Subject } from 'rxjs/Subject';
import { Observable } from 'rxjs/Observable';

export class LanguageComponent implemnts OnInit {
  displayedColumns = ['name', 'native', 'code', 'leavel'];
  user: any;
  private update = new Subject<void>();
  update$ = this.update.asObservable();

  constructor(private authService: AuthService, private dialog: MatDialog) {}

   ngOnInit() {
     this.update$.subscribe(() => { this.refresh()});
   }

   setUpdate() {
     this.update.next();
   }

   add() {
     this.dialog.open(LanguageAddComponent, {
     data: { user: this.user },
   }).afterClosed().subscribe(result => {
     this.setUpdate();
   });
 }

 refresh() {
   this.authService.getAuthenticatedUser().subscribe((res) => {
     this.user = res;
     this.teachDS = new LanguageDataSource(this.user.profile.languages.teach);   
    });
  }
}

2018-04-23 15:17:43

// this is the dataSource    
this.guests = [];

this.guests.push({id: 1, name: 'Ricardo'});

// refresh the dataSource
this.guests = Array.from(this.guest);

2019-06-05 12:54:57

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

我已经尝试了ChangeDetectorRef, Subject和行为Subject，但对我有用

dataSource = [];
this.dataSource = [];
 setTimeout(() =>{
     this.dataSource = this.tableData[data];
 },200)

2020-02-29 12:47:06

如何刷新一个数据源(mat-table)

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