J'ai ce tuyau filtre:Angular2 Utilisation ENUM dans le tuyau
import { Pipe, PipeTransform } from '@angular/core';
import { TaskStatus } from './task-status';
@Pipe({name: 'WithStatus'})
export class TaskStatusFilter implements PipeTransform{
transform(items: any[], args: any[]): any {
return items.filter(item => item.status == args[0]);
}
}
TaskStatus est un ENUM:
export enum TaskStatus{
New, Dev, Test, Deploy
}
Maintenant, je veux utiliser le tuyau dans un composant en passant une valeur ENUM.
import { Component, OnInit } from '@angular/core';
import { Task } from '../task/task';
import { TaskStatus } from '../task/task-status';
@Component({
selector: 'app-board',
templateUrl: './board.component.html',
styleUrls: ['./board.component.css']
})
export class BoardComponent implements OnInit {
tasks: Array<Task>;
public TaskStatus = TaskStatus;
constructor() {
this.tasks = [
new Task(1,'tasl1', 'task1 description', TaskStatus.New),
new Task(2,'tasl2', 'task2 description', TaskStatus.New),
new Task(3,'tasl3', 'task3 description', TaskStatus.New),
new Task(4,'tasl4', 'task4 description', TaskStatus.Dev),
new Task(5,'tasl2', 'task2 description', TaskStatus.Dev),
new Task(6,'tasl6', 'task6 description', TaskStatus.Test),
new Task(7,'tasl7', 'task7 description', TaskStatus.Deploy)
];
}
ngOnInit() { }
}
board.component.html:
<div class="grid grid-pad">
<div class="col-1-4">
<div class="content">
<h2>New</h2>
<app-task-card *ngFor="let task of tasks | WithStatus: TaskStatus.New" [task]="task"></app-task-card> <!-- This does not work - the filter is false for every element -->
</div>
</div>
<div class="col-1-4">
<div class="content">
<h2>Development</h2>
<app-task-card *ngFor="let task of tasks | WithStatus: '1'" [task]="task"></app-task-card> <!--passing the value of the enum works-->
</div>
</div>
<div class="col-1-4">
<div class="content">
<h2>Test</h2>
<app-task-card *ngFor="let task of tasks | WithStatus: '2'" [task]="task"></app-task-card>
</div>
</div>
<div class="col-1-4">
<div class="content">
<h2>Deploy</h2>
<app-task-card *ngFor="let task of tasks | WithStatus: '3'" [task]="task"></app-task-card>
</div>
</div>
</div>
Si je passe une chaîne qui correspond à la valeur ENUM comme '0', '1', etc., cela fonctionne, mais si je passe TaskStatus.New - aucune valeur n'est affichée.
Existe-t-il un moyen d'utiliser une énumération en tant qu'argument Pipe?