ng-dynaform/src/app/dynaform/components/_abstract/group-input.component.ts

import { Input, OnInit } from '@angular/core';
import { FormGroup, FormArray } from '@angular/forms';

export abstract class GroupInputComponent implements OnInit {

	@Input()
	control: FormGroup | FormArray;

	@Input()
	meta;

	formGroup: FormGroup;
	childMetaArray: Array<StringMap>;
	controlNames: Array<string>;

	exposeMetaInTemplate: string[] = [];

	ngOnInit() {
		// Move meta variables up a level, for direct access in templates
		this.exposeMetaInTemplate.map(p => this[p] = this.meta[p] !== undefined ? this.meta[p] : this[p]);

		// Get the FormGroup, and information about the controls inside it
		this.formGroup = this.control as FormGroup;
		this.childMetaArray = Object.values(this.meta.meta); // Metadata array of all controls in group
		this.controlNames = Object.keys(this.formGroup.controls);
	}

}