Revoke the prior invocation of the Google Maps geocoding function

While working on implementing an autocomplete with JavaScript and the Google Maps geocode method (using the keyup event on input), I have encountered a problem where I sometimes receive the results of the previous search instead of the current one.

I am looking for a way to cancel the previous call if it has not finished yet. Can anyone provide assistance?

getAddressLatLng : function(text,callback) {
    var geocoder = new google.maps.Geocoder();
     geocoder.geocode({
         address : text,
         region : Utils.getRegion()
     },
     function(results, status) {
         if (status == google.maps.GeocoderStatus.OK) {
             callback(results);
         }
     });
},
javascriptajaxgoogle-mapscallbackgoogle-geocoder

Answer №1

To prevent multiple requests, consider implementing a global request counter that only triggers the callback if it remains unchanged. For example:

var requests = 0;
...
    getAddressLatLng : function(text,callback) {
        var requestNum;
        requests++;
        requestNum = requests;
        var geocoder = new google.maps.Geocoder();
         geocoder.geocode({
             address : text,
             region : Utils.getRegion()
         },
         function(results, status) {
             if(requestNum != requests) return;
             if (status == google.maps.GeocoderStatus.OK) {
                 callback(results);
             }
         });
    },

Additionally, I recommend incorporating debouncing or throttling in your function to avoid unnecessary requests and conserve bandwidth. You can use libraries like Underscore.js which provide convenient functions for this purpose.

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