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July 18, 2018

Angular, Preserving Query Params and Google AdWords

… and how all this leads to an incorrect source of traffic in Google Analytics and incorrect conversion attribution.   The situation is as follows: On www.thecodecampus.de we run an Angular 6 page. We advertise our product with Google AdWords. If a visitor comes via Google AdWords, the URL is appended with a glcid and several campaign parameters as query params. This data is important for tracking, as Google Analytics determines
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Can Kattwinkel

Entwickler bei thecodecampus

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 switched from monkey patching to the import of pipeable operators (also known as lettable operators).
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Can Kattwinkel

Entwickler bei 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 Angular client is being served from example.com and your server is available on server.com. In
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Christoph Strauss

Entwickler bei thecodecampus

February 12, 2018

Angular Universal XMLHttpRequest is not defined with HttpClient

I’ve recently had an extremely weird application behavior. The application is this server side rendered Angular page.  I discovered that the router outlet for this page was empty on the SSR result. I hadn’t noticed before since the site was bootstrapping really fast even without SSR. A quick look into Sentry – which holds our server logs  – revealed the cause. I got the following error: XMLHttpRequest is not defined This
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Can Kattwinkel

Entwickler bei thecodecampus

February 7, 2018

Angular Universal Handle 404 and Set Status Codes

When working with Angular Universal we can implement a full-fledged server. Of course, this does not only include for example to display a 404 page for incorrect urls but also setting the correct status code. So that for example search engines and crawlers in general can process the result correctly. Angular itself allows us to easily create a 404 page via the router package. However, this is to be regarded
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Can Kattwinkel

Entwickler bei 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 post I’m going to go through everything you need to get started with Cloud Firestore
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Mark Kvetny

Entwickler bei thecodecampus

November 2, 2017

Material 2: Sticky Footer with Mat Sidenav

A very common use case for the sidenav of Material 2 is the use in a layout with a sticky footer. Unfortunately, the documentation of the Mat-Sidenav does not show how to do this best. But that’s not a big deal, because you can achieve your goal quickly if you know how to use Flexbox. We assume that routing is used. In addition to the sticky footer, we want to make sure
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Can Kattwinkel

Entwickler bei thecodecampus

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.

It throws because the response is of a false type and the body of
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Can Kattwinkel

Entwickler bei thecodecampus

Reuse Angular Code within NativeScript Apps

NativeScript is a great framework to write mobile Apps for Android and iOS with Angular (2, 4 and so on). Read on, if you: have an existing Angular Web App or are planning to develop one you want to offer a native App for Android and iOS without a lot of extra work TL;DR It is possible to reuse code, especially Services and Pipes, if you are lucky some of the
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Frederik von Berg

Entwickler bei thecodecampus

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 faced some challenges! Read on, if you’re interested in what happened in the last year,
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Jan Blankenhorn

Entwickler bei thecodecampus