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

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

其他回答

在我的例子中(Angular 6+)，我继承了MatTableDataSource来创建MyDataSource。事后都不打电话。data = someArray

this.entitiesSubject.next(this.data as T[])

未显示的数据

类的一个

export class MyDataSource<T extends WhateverYouWant> extends MatTableDataSource<T> {

    private entitiesSubject = new BehaviorSubject<T[]>([]);


    loadDataSourceData(someArray: T[]){
        this.data = someArray //whenever it comes from an API asyncronously or not
        this.entitiesSubject.next(this.data as T[])// Otherwise data not displayed
    }

    public connect(): BehaviorSubject<T[]> {
        return this.entitiesSubject
    }

}//end Class

2019-02-17 12:38:06

// 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

当你设置你的数据源。Ts文件，而不是使用一个简单的数组的数据使用一个主题和getter/setter的数据，如下所示:

 dataStream = new BehaviorSubject<DataSourceItem[]>(EXAMPLE_DATA);
 set data(v: DataSourceItem[]) { this.dataStream.next(v); }
 get data(): DataSourceItem[] { return this.dataStream.value; }

然后在connect()函数中使用dataStream主题，如下所示:

return merge(this.dataStream, this.paginator.page, this.sort.sortChange)

所以现在当你改变数据源时。数据数组…像这样:

this.dataSource.data = ['my','new','item']

它将触发setter中的this.dataStream.next(v)， connect()函数将正确更新您的表。

完整的工作示例可以在这里找到: https://stackblitz.com/edit/angular-material2-issue-yzhsml?file=app%2Fdata-table-datasource.ts

2022-12-14 13:18:38

在Angular 10中，这对我来说是有效的: 在HTML中:

<mat-table [dataSource]="myArray">

在组件TS中:

    myArray: MyObject[] = [];

 addObjectToTable(object:MyObject): void {
      //TO PREVENT DUPLICATED OBJECTS
    if (object&& !this.myArray.includes(object)) {
      this.myArray.push(object);
      // TO FORCE DATA-TABLE's DATASOURCE TO REFRESH
      this.myArray= [...this.myArray];
    }
  }

2020-12-03 14:55:31

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

如何刷新一个数据源(mat-table)

推荐文章

最新文章

标签