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 disable

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 */ };

Answer 2

Unfortunately there is no implemented option to detect a disabled API.

Last year I've made a feature-request , but I don't think that something will happen.

two possible options(there may be more):

1. when you use a map usually the API first will try to create the map(some elements will be added to the map-container ). When the API will be disabled, these elements will be removed. So you may do something when this happens(e.g. set a variable that indicates the disabled-status):

    document.getElementById('map-canvas')//map-container
     .addEventListener ('DOMNodeRemoved', function(e){
         if(!this.children.length){
           alert('the API has been disabled');
           if(window.google && window.google.maps){
             window.google.maps.disabled=true;
           }
         }
       }, false);
   

2. override the alert-method to intercept the particular message:

   (function(f){
     window.alert=function(s){
       if(s.indexOf('Google has disabled use of the Maps API for this application.')
          ===0){
   
         if(window.google && window.google.maps){
           window.google.maps.disabled=true;
           alert('the API has been disabled');
           return;
         }
       }
       f(s);
     }
   })(window.alert)
   

In both cases you may later use the (custom)disabled-property of google.maps to check if the API has been disabled:

if(google.maps.disabled===true){
  //execute alternative code
}