Showing posts from May, 2017

Get list of object keys in Angular

import { PipeTransform, Pipe } from "@angular/core"; @Pipe({ name: 'keys' }) export class KeysPipe implements PipeTransform {   transform(value, args:string[]) : any {     return Object.keys(value);   } } Then to get a list of errors for a form element you can do this <ul *ngIf="form.get('userName').invalid" class="help-block with-errors">    <li *ngFor="let error of form.get('userName').errors | keys">{{ error.key }}</li> </ul>