Como conecto minha tabela md (tabela de dados cdk) a um serviço para ser usado como fonte de dados?
Desculpe, mas estou no escuro com este.
Eu tenho um método que retorna uma matriz de objetos e uso essa matriz de objetos para exibir uma tabela. esta é a função que estou usando:
getCompetitions(): Promise<Competition[]> {
let options: RequestOptionsArgs = {};
let params = new URLSearchParams();
params.append('size', '250');
options.params = params;
return this.http.get(this.competitionsUrl,options)
.toPromise()
.then(response => response.json()._embedded.competitions as Competition[])
.catch(this.handleError);
}
MinhasngOnInit () O método estava chamando essa função no início e recebendo uma série de competições que foram iteradas comngFor e eu estava criando a tabela sem problemas.
O que eu quero é implementar o componente md-table ou cdk-table. Eu tenho o restante do aplicativo usando essa biblioteca de interface do usuário.
Eu sei que minhas importações estão corretas.O HTML parece estar correto porque o cabeçalho único que tenho é exibidoNão há erros no console, mas ocompetitionsDataSource parece estar vazio.Eu adiciono meus arquivos abaixo, sei que o problema está na implementação ou como estou tentando preencher o dataSource.
Aqui estáa classe de competição:
export class Competition {
compName: string;
compStart: Date;
compEnd: Date;
compFull: number;
compTeamCount: number;
compChamp: number;
compRunnerup: number;
compType: number;
compCountry: string;
_links: {
self: {
href: string;
},
matches: {
href: string;
}
}
}
Aqui estáo componente
import { Component, OnInit } from '@angular/core';
import { DataSource } from '@angular/cdk';
import { Observable } from 'rxjs/Observable';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { Competition } from '../../competition/competition';
import { CompetitionService } from '../../competition/competition.service'
import 'rxjs/add/operator/startWith';
import 'rxjs/add/observable/merge';
import 'rxjs/add/operator/map';
@Component({
selector: 'comp-table-cmp',
moduleId: module.id,
templateUrl: 'competitions-table.component.html',
})
export class CompetitionsTableComponent{
//1- Define my columns
displayedColumns = ['compName'];
//2- Define the database as a new database
competitionsDatabase = new CompetitionsDatabase();
//3- Define the datasource
competitionsDatasource: CompetitionsDatasource | null;
ngOnInit() {
//4 - declare the datasource.
this.competitionsDatasource = new CompetitionsDatasource(this.competitionsDatabase);
console.log(this.competitionsDatasource);
}
}
export class CompetitionsDatabase {
competitions: Competition[];
dataChange: BehaviorSubject<Competition[]> = new BehaviorSubject<Competition[]>([]);
get data(): Competition[] {
this.competitions = [];
this.competitionService.getCompetitions().then(
results => {
results.forEach(result => {
if (result.compType === 1) {
this.competitions.push(result);
this.dataChange.next(results);
}
//Call Method to retrieve team names.
});
return results;
}
)
console.log(this.dataChange);
return this.competitions;
}
constructor(
private competitionService: CompetitionService,
) {}
}
export class CompetitionsDatasource extends DataSource<any> {
constructor(private _exampleDatabase: CompetitionsDatabase) {
super();
}
/** Connect function called by the table to retrieve one stream containing the data to render. */
connect(): Observable<Competition[]> {
console.log('ExampleDataSource#connect')
return this._exampleDatabase.dataChange;
}
disconnect() {}
}
E o HTML:
<div class="example-container mat-elevation-z8">
<cdk-table #table [dataSource]="CompetitionsDatasource" class="example-table">
<!--- Note that these columns can be defined in any order.
The actual rendered columns are set as a property on the row definition" -->
<!-- CompName Column -->
<ng-container cdkColumnDef="compName">
<cdk-header-cell *cdkHeaderCellDef class="example-header-cell"> CompName </cdk-header-cell>
<cdk-cell *cdkCellDef="let row" class="example-cell"> {{competition.compName}} </cdk-cell>
</ng-container>
<cdk-header-row *cdkHeaderRowDef="displayedColumns" class="example-header-row"></cdk-header-row>
<cdk-row *cdkRowDef="let row; columns: displayedColumns;" class="example-row"></cdk-row>
</cdk-table>
</div>
O resultado é apenas o cabeçalho "CompName"
Por favor ajude!