November 21, 2018

Call a method on @Input() change

Problem You probably already run into this issue. Inside a component, you want to react to the change of an @Input() value e.g. by calling a method of your component. For example we have get an @Input() filter: string from our parent component and if the @Input() changes, we want to update our data in […]
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Frederik von Berg
Developer at thecodecampus </>


March 2, 2018

The ‘this’ context of type ‘void’ is not assignable to method’s ‘this’ of type ‘Observable<{}>‘.

If you are experiencing this error – usually something with your RxJS imports is wrong. So you should go through them manually or simply delete all imports from RxJS in the corresponding file and let the IDE generate them again. Something broken could look like this:

Better working might be:

What is happening? RxJS […]
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Can Kattwinkel
Developer at thecodecampus </>


February 23, 2018

Creating a CORS Middleware in nest.js

Nest.js is a great framework for writing REST-API’s using Node.js. It features Angular’s dependency injection, an complete TypeScript integration and helps you with structuring your code. A common issue when working with REST-API’s is Cross-Origin-Request-Sharing (CORS), which keeps your Angular client from requesting resources which are located on another domain. Let’s pretend, for instance your […]
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Christoph Strauss
Developer at thecodecampus </>


November 13, 2017

Getting started with Firestore and AngularFire2

A few weeks ago, Google has released its new solution for building scalable cloud databases — the Cloud Firestore. It has some nice improvements in comparison to their previous database (which used to be called Firebase but is now referred to as ‘Realtime Database’), like better data structuring and a more powerful querying API. In this […]
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Can Kattwinkel
Developer at thecodecampus </>


August 14, 2017

Angular HTTP Testing “SyntaxError: Unexpected token o in JSON at position 1”

tl:dr; Solve this Issue: Add the following line to your imports:

  Full version: A common problem affecting many developers when writing tests for the Angular 4 HTTP service is the following stack trace. It occurs if you assemble an response using a the wrong class. The call of .json()will throw the error.

[…]
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Can Kattwinkel
Developer at thecodecampus </>


April 3, 2017

JavaScript Running On A Wearable? Yes, And Its Native.

A while ago some folks asked me, if it’s possible to use NativeScript and Angular with Android Wear. tl:dr; It’s possible, easy to setup in 5 steps and with FlexBox in NativeScript you can even handle small screens. NativeScript is a framework to build truly native apps for iOS and Android based on JavaScript. Furthermore it plays […]
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Frederik von Berg
Developer at thecodecampus </>


March 13, 2017

What we learned in 1 year of Angular 2 trainings

When we founded theCodeCampus.de in 2014 we had some year’s experience in developing angular 1 applications. We also had a few years’ experience of doing trainings for Eclipse RCP. Last year we added our angular 2 trainings, months before angular 2 was finally released! We were really surprised how well it was received, but also […]
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Jan Blankenhorn
Developer at thecodecampus </>


October 27, 2016

IntelliJ / WebStorm für TypeScript einrichten

For English version please go to “Howto: Configure IntelliJ/WebStorm for TypeScript development” on medium.com JetBrain’s IDEs (IntelliJ, WebStorm, …) haben TypeScript sehr früh unterstützt und sind derzeit definitiv mit die beliebtesten IDEs. Sie für die Entwicklung mit TypeScript zu konfigurieren kann aber derzeit recht frustrierend sein. Falsche Fehlermeldungen und träges Verhalten sind gängige Probleme. In diesem Blog-Eintrag […]
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Roman Roelofsen
Developer at thecodecampus </>


October 7, 2016

Angular 2 Animate.css Tutorial – How to use Animate.CSS in NG2 Application?

This Article will serve as a guide to implementing Animate.css animations with Angular 2 animation system. Animate.css is a popular and handy library for simple CSS Animations. We’ll apply the animation to a component and control it via a button. We will not use ngClass but convert the Animate.css to fit Angular 2 Animate. Final Result:   Git […]
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Can Kattwinkel
Developer at thecodecampus </>