With the @HostBinding() annotation, Angular gives you a useful tool to handle manipulations of css classes of parent Elements. The advantage is quite clear, the required logic remains in the components class and is not set in the template file. This makes it easier to test and improves the readability of the template file. In […]
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tl;dr Use Node Package local-web-server and its command ws with the spa flag like this: ws --spa index.html While developing an Angular based SPA usually you will use the Angular CLI as build too. The CLI has an integrated development server which is able to handle client-side routing. So whenever a reload happens and you’re […]
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… 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 […]
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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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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 […]
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As a developer you may get the task adding a Sitemap and a robot.txt to your Angular project. This is quite easy if it is being built with Angular CLI. Copy the files next to the favicon.ico  into the /src  folder of your Angular project.

  Now open up the angular.json file in the […]
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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 […]
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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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What is this article about? If you develop a web application with Angular, sooner or later you will run into the following problem: Where will the data generated by the client be validated? Client side validation is included in Angular, and gives the user a fast feedback about the correctness of his data. This is […]
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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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