How to retrieve data from firebase witn Angularfire 2 in alert or any component?

How to retrieve data from firebase witn Angularfire 2 in alert or any component ? can you give me an example ?

What do you need to do that the official sample app isn’t doing?

Another great resource would be https://javebratt.com/ for working with AngularFire and Firebase.

i have read the blog posts , he haven`t had any any example about what i say , if you want to help give me example