I am attempting to create a method for deleting and adding items to an array, but I need easy-to-use delete and add methods since I am unfamiliar with TypeScript.
export class NgForComponent implements OnInit {
Numbers: number[];
constructor() {
this.Numbers = [1, 2, 3, 4, 5];
}
ngOnInit() {
}
}
HTML
<div>
<ul>
<li *ngFor="let number of Numbers">
{{number}}
</li>
</ul>
</div>
<button >Delete</button>
<li *ngFor="let number of Numbers;let i = index">
{{number}}
<button (click)="removeNumber(i)">Remove</button>
</li>
in typescript
removeNumber(i){
this.Numbers.splice(i,1);
}
To ensure you are deleting the correct item, you must include the delete function within the ngFor loop. Alternatively, you can modify your interface to clearly identify which item should be deleted.
<ul>
<li *ngFor="let number of Numbers">
{{number}}
<button (click)="delete(number)">Delete</button>
</li>
</ul>
In your Typescript file:
delete(item: any){
this.Numbers.splice(item, 1);
}
<ul>
<li *ngFor="let number of Numbers">
{{number}}
<button (click)="remove(number)">Remove</button>
</li>
</ul>
and the corresponding typescript code
remove(number){
this.Numbers.filter(num => num !== number)
}
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