Miha Šušteršič Miha Šušteršič - 1 year ago 247
TypeScript Question

Angular2 - OnInit is not defined

I'm trying to implement the angular 2 onInit function but I get the following error in the console:

Error: ReferenceError: OnInit is not defined(...)

Can somebody point out what I'm doing wrong?

This is my component:

import { Component, OnInit } from 'angular2/core';
import { ViewEncapsulation } from 'angular2/core';

selector: 'Landing',
templateUrl: '/app/views/landing.html',
styleUrls: ['../app/styles/landing.css'],
encapsulation: ViewEncapsulation.None

export class LandingComponent implements OnInit {

function checkOverflow() {
var element = document.querySelector('.appContainer');
if( (element.offsetHeight < element.scrollHeight) || (element.offsetWidth < element.scrollWidth)){
// your element have overflow
console.log('NO OVERFLOW');

OnInit() {


Answer Source

Use single import instead of two import statements. Also use @ before @angular/core if you are using rc(release candidate) version

import { Component, OnInit, ViewEncapsulation } from '@angular/core';

You should implement ngOnInit method as you component class implements OnInit class

ngOnInit() {

Additionally don't use function in the way you are currently using in typescript file, do convert it to checkOverflow(){ ... } format & then call it like this.checkOverflow()

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