JReviews Developer Filter: Limit loading of Google Maps API in front-end to the listing form

google_api_listing_form_only.php

<?php
defined('MVC_FRAMEWORK') or die;

/**
 * In front-end, load Google Maps API only while using the listing form
 * if either the map service or geocoding service is set to Google
 */
function google_api_listing_form_only($load, $params)
{
	if ( $params['in_admin'] )
	{
		return $load;
	}
	elseif ( 
		in_array($params['route'], ['listings.create','listings.edit']) 
		&& 
		($params['maps_service'] == 'google' || $params['geocoding_service_front'] == 'google') 
	) {
			return true;
	}

	return false;
}

Clickfwd\Hook\Filter::add('maps_load_google_api', 'google_api_listing_form_only', 10);

To use this filter:

1. Upload the above file to jreviews_overrides/filters
2. Add the line below to jreviews_overrides/filter_functions.php, if you are not using filters yet, read the documentation on Getting Started with JReviews developer filters

require_once "google_api_listing_form_only.php";