Pop Up when Beacon is near

Hallo,

I am still a beginner and I have made the following tutorial:

https://www.thepolyglotdeveloper.com/2015/09/support-ibeacons-in-your-ionic-framework-mobile-app/

It works well for me.I have three beacons that all have the same UUID. Now I would like to have a PopUp or Alert, when the Beacon (minor=1) is NEAR.

Do you have ideas or examples?

Thanks for your help!