如何解决Mat Table的Mat Paginator无法使用api数据
我见过类似的问题,但似乎没有任何效果。我有一个席子表,在其中显示api的数据。但是我不知道如何遍历“数据源”。以下是我的代码,以及检查控制台日志时如何获取数据。 ts文件
import {AfterViewInit,Component,OnInit,ViewChild} from '@angular/core';
import {Pokemon,PokemonData} from '../../models/pokemon';
import {PokemonService} from '../../models/services/pokemon.service';
import {ActivatedRoute} from '@angular/router';
import {MatTableDataSource} from '@angular/material/table';
import {MatPaginator} from '@angular/material/paginator';
@Component({
selector: 'app-pokemon',templateUrl: './pokemon.component.html',styleUrls: ['./pokemon.component.css']
})
export class PokemonComponent implements OnInit {
public pokemon: Pokemon[];
public name: string;
public url: string;
public type: string;
expandedElement: PokemonData | null;
dataSource = new MatTableDataSource();
displayPokemonColumns: string[] = ['name','url','pokemonDetails'];
@ViewChild(MatPaginator,{read: true}) paginator: MatPaginator;
//
// // tslint:disable-next-line:typedef
// tslint:disable-next-line:typedef
// ngAfterViewInit() {
// // this.dataSource.paginator = this.paginator;
// //
// }
constructor(private pokemonService: PokemonService,private route: ActivatedRoute) {
}
// function (which is called below)issues call to API. subscribes shows to the results that are returned. adds results to shows array
onLoadPokemonList(): void {
this.pokemonService.getPokemonList().subscribe(
res => {
// this.pokemon = JSON.parse(JSON.stringify(res));
this.pokemon = res;
this.dataSource.data = this.pokemon;
setTimeout(() => {
this.dataSource.paginator = this.paginator;
});
console.log(this.dataSource);
});
}
ngOnInit(): void {
this.onLoadPokemonList();
}
}
html文件
<div class="table" *ngIf="pokemon">
<h1 matColumnDef="title">POKEDEX</h1>
<table mat-table #table [dataSource]="dataSource" class="mat-elevation-z8" multiTemplateDaTarows>
<!-- <table mat-table [dataSource]="pokemon.results" class="mat-elevation-z8" multiTemplateDaTarows>-->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef> Name </th>
<!-- <td mat-cell *matCellDef="let res"> {{res?.name}} </td>-->
<td mat-cell *matCellDef="let res"> {{res.name}} </td>
</ng-container>
<ng-container matColumnDef="url">
<th mat-header-cell *matHeaderCellDef> URL </th>
<td mat-cell *matCellDef="let res"> {{res.url}} </td>
</ng-container>
<ng-container matColumnDef="pokemonDetails">
<th mat-header-cell *matHeaderCellDef> Pokemon Details </th>
<td mat-cell *matCellDef="let res">
<button mat-raised-button color="primary" routerLink="/pokemonData/{{res.name}}">Pokemon Details</button>
</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayPokemonColumns; sticky: true"></tr>
<tr mat-row *matRowDef="let row; columns: displayPokemonColumns;"
class="example-element-row"
[class.example-expanded-row]="expandedElement === row"
(click)="expandedElement = expandedElement === row ? null : row"></tr>
</table>
<mat-paginator #paginator
[pageSize]="10"
[pageSizeOptions]="[5,10,20]">
</mat-paginator>
</div>
这是我得到的数据:
MatTableDataSource {_renderData: BehaviorSubject,_filter: BehaviorSubject,_internalPageChanges: Subject,_renderChangesSubscription: Subscriber,sortingDataAccessor: ƒ, …}filterPredicate: (data,filter) => {…}filteredData: {count: 1050,next: "https://pokeapi.co/api/v2/pokemon?offset=150&limit=150",prevIoUs: null,results: Array(150)}sortData: (data,sort) => {…}sortingDataAccessor: (data,sortHeaderId) => {…}_data: BehaviorSubject {_isScalar: false,observers: Array(1),closed: false,isstopped: false,hasError: false, …}_filter: BehaviorSubject {_isScalar: false, …}_internalPageChanges: Subject {_isScalar: false,observers: Array(0), …}_paginator: undefined_renderChangesSubscription: Subscriber {closed: false,_parentOrParents: null,_subscriptions: Array(1),syncErrorValue: null,syncErrorThrown: false, …}_renderData: BehaviorSubject {_isScalar: false, …}data: (...)filter: (...)paginator: (...)sort: (...)__proto__: DataSource
我需要的数据在filteredData下。
当我这样做
<table mat-table [dataSource]="pokemon.results" class="mat-elevation-z8" multiTemplateDaTarows>
我得到了正确的表而不是数据源,但分页器(显然)不起作用。
解决方法
问题是当您尝试分配分页器时,分页器不在DOM中(您的mat-paginator在具有* ngIf的div下)。您需要对Angular进行“更改”才能获取它,因此需要将其封装在订阅函数内部的setTimeout中
this.pokemonService.getPokemonList().subscribe(res => {
//why you use JSON.stringify? in Angular by defect a http.get return a json
this.pokemon = JSON.parse(JSON.stringify(res));
// this.pokemon = res;
this.dataSource.data = this.pokemon;
//here you indicate the paginator
setTimeout(()=>{
this.dataSource.paginator = this.paginator;
})
});
简要说明:在订阅并获取数据之前,变量“ pokemon”为空或未定义。 (请注意,您在HTML中有*ngIf="pokemon"
)。当您获取数据时,变量具有值,因此,“当Angular完成指令时”,刷新应用程序以显示表格。这是因为您需要一个setTimeout
最后起作用的是删除了模板上的* ngIf条件。我在堆栈溢出时找到了此解决方案。分页器现在可以正常工作。
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