How to Prevent the Google Maps API OVER_QUERY_LIMIT Error in v3?

How to Handle OVER_QUERY_LIMIT Error in Google Maps API v3

Introduction:

In Google Maps API v3, you may encounter the OVER_QUERY_LIMIT error when making too many geocoding requests in a short period. To avoid this error, it's necessary to implement a delay mechanism between requests.

JavaScript Implementation:

To introduce a pause between geocoding calls, you can use the following JavaScript code:

<code class="javascript">function codeAddress(vPostCode) {
  if (geocoder) {
    // If there's an existing delay, wait for it to finish
    while (wait) {
      /* Just wait. */
    }

    geocoder.geocode({ 'address': "'" + vPostCode + "'"}, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        map.setCenter(results[0].geometry.location);
        var marker = new google.maps.Marker({
            map: map,
            position: results[0].geometry.location
        });
      } else if (status == google.maps.GeocoderStatus.OVER_QUERY_LIMIT) {
        wait = true;
        setTimeout(function() {
          wait = false;
        }, 2000); // Set a delay of 2000 milliseconds
      } else {
        alert("Geocode was not successful for the following reason: " + status);
      }
    });
  }
}</code>

This code checks for existing delays, sets a new delay if the OVER_QUERY_LIMIT error occurs, and waits for the delay to finish before resuming geocoding.

Example:

In your provided code, you can replace the existing codeAddress function with the updated version:

<code class="javascript">function codeAddress(vPostCode) {
  if (geocoder) {
    while (wait) { /* Just wait. */ };

    geocoder.geocode( { 'address': "'" + vPostCode + "'"}, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        map.setCenter(results[0].geometry.location);
        var marker = new google.maps.Marker({
            map: map, 
            position: results[0].geometry.location
        });
      } else if (status == google.maps.GeocoderStatus.OVER_QUERY_LIMIT) { 
        wait = true;
        setTimeout(function() {
          wait = false;
        }, 2000);
      } else {
        alert("Geocode was not successful for the following reason: " + status);
      }
    });
  }
}</code>

This modification will introduce the necessary delays to prevent the OVER_QUERY_LIMIT error.

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