I want to display some data and tables in the content `div` which depends on which category you choose on the left hand side navigation.
So if I change the category also the displayed content of the content div should change.

Here is my code on [Plunkr](https://plnkr.co/edit/knaGTyenFzUnggQ3UYWG).

But it seems that not even this simple example is working.

So I have two Questions:

1.) How can I fix this example code to run ?

But more important:

2.) **Is there a better way to change the content div when you change the category ?**