I've made a trip planner for bus and I had an idea. Instead of doing the request from a PHP page using AJAX when someone click on the map to setup the marker, I created a script using the method geocoder from Google Maps API in Javascript.
Now, since I know Google limit the request per day per "IP" at 2,500 I want to know something.
Since the request is made by Javascript (client script) directly to the Google server's. My website will use the limit of 2 500 because the request come from a script on my website or it's going to be 2 500 requests per client I get (by IP in reality) because the request come from the client side ?
Thanks.
The IP Address used is the servers, not the clients. If you plan on it exceeding 25,000 a day, than you can signup through Google's paid services, and they will charge for anything exceeding the limit.
Your web site can access 25,000 map loads per day so (an example) if you have 5,000 visitors then each can access 5 map loads and then you will hit your limit.
Found here in the google maps api documentation.
Your idea of the definition of a map load is specifically addressed here in the documentation:
A single map load occurs when:
a map is displayed using the Maps JavaScript API (V2 or V3) when loaded by a web page or application;
Therefore, the server's IP address is used.