Angular

FormArray

• Use FormArray class to work with Array of objects in a form

form = new FormGroup({
	topics: new FormArray([])
})

addTopic(topic: HtmlInputElement) {
	this.topics.push(new FormControl(topic.value))
	topic.value = "";
}

get topics() {
	return this.form.get('topics') as FormArray;
}

removeTopic(topic: FormControl) {
	let index = this.topics.controls.indexOf(topic);
	this.topics.removeAt(index);
}

<form>
	<input type="text" class="form-control" (keyup.enter)="addTopic(topic)" #topic>
</form>

<ul class="list-group">
	<li *ngFor="let topic of topics.controls"
	class="list-group-item"
	(click)="removeTopic(topic)"
	>
		{{topic.value}}
	</li>
</ul>