Pop up openlayers

Question

I am working on a map with different layers. My goal would be to display the information of the layers with a pop up as explained in the tutorial of openlayer. However testing the code I get as output:

Uncaught TypeError: map.on is not a function

Can anyone help me?

Answer 1

map.on is not a function means that you have a map variable and it either does not have an on member, or, if it has, on is not a function . Since the error is not telling you that you cannot use .on of undefined , we have to assume that map is either incorrectly initialized or its initialization was not completed yet when you tried to call its on . This answer cannot give you any further information unless you specify your problem further.