Creating and Unit Testing a Theme Switcher Directive in Angular

A while ago I needed a theme/style switcher which could switch themes during runtime. For example, with Theme A activated my buttons would be red, but with Theme B activated my buttons would change from red to blue. There are various ways of accomplishing this, so I decided to do some Googling. A few popular solutions proposed were:

Instead I decided to build a directive which I could apply to any component, and which binds CSS properties to the selected theme properties. For example, the following would bind the color of my h1 tag to a theme property 'textHigh'.

Using a service, I’d then say: The current selected theme is called ‘red’ where 'textHigh' is #FF0000. A fully dynamic and scalable solution!

This article is all about learning. I’ll explain step-by-step how I built this solution. It is suited for anyone who has some basic Angular experience and wants to take his skills to the next level! I will teach you the following:

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