javascript - Determine if Google Maps API is using an invalid key during runtime

Question

I'm looking for a way to determine whether a valid Google maps API key is being used. Using an invalid key, we receive an error stating that the google API has been disabled. I'd like to capture that return, and determine whether or not to do our geocoding functions based on that return.

As it stands, when we save a record, we look to see if the address has been changed. If it has, we get the geocode of that address, and after the success/failure message has been passed back, we continue on with our processing before we save the record.

When the API is disabled, the code simply stops. Nothing is returned - no success or failure. At this point, our code stops as well as we rely on the return so we know where to go from there. We are not looking for a way to get around licensing, simply a way to determine whether the API is disabled at runtime. Any ideas?

Answer 1

Well there's something i found in Web > Maps JavaScript API > Events under title "Listening for authentication errors"

If you want to programmatically detect an authentication failure (for example to automatically send an beacon) you can prepare a callback function. If the following global function is defined it will be called when the authentication fails.

so you just need to define a global function:

function gm_authFailure() { /* Code */ };