how can i list locations whose postcode starts with a specific number

You could use create your own shortcode which uses the em_locations_output_locations filter. Something like this:

add_shortcode('my_locations_list', 'my_em_locations_list_func');
function my_em_locations_list_func($args, $formats='') {
    global $em_postcode_re;
    $args = (array) $args;
    if (!empty($args['location_postcode'])) {
        $em_postcode_re = $args['location_postcode'];
        add_filter('em_locations_output_locations', 'my_em_locations_output_locations');
    }
    else {
        $em_postcode_re = null;
    }
    $ret = em_get_locations_list_shortcode($args, $formats);
    if ($em_postcode_re !== null) {
        remove_filter('em_locations_output_locations', 'my_em_locations_output_locations');
    }
    return $ret;
}
function my_em_locations_output_locations($locations) {
    $global $em_postcode_re;
    $new_locations = [];
    foreach ($locations as $EM_location) {
        if (!empty($EM_location->location_postcode) && preg_match('/^' . $em_postcode_re . '/', $EM_location->location_postcode ) ) {
             $new_locations[] = $EM_location;
        }
    }
    return $new_locations;
}

Then use the following shortcode:

[my_locations_list location_postcode="4*"]

The postcode attribute on the locations_list shortcode can have the value of true or false. Which tells it whether to search for events with locations.

You don’t really need to use regular expressions for this. Here’s a simpler version:

add_shortcode('my_locations_list', 'my_em_locations_list_func');

function my_em_locations_list_func($args, $formats = '') {
    global $postcode_first_char;

    $args = (array) $args; // Ensure $args is an array

    // Force a high limit if not set, to ensure all locations are fetched
    if (!isset($args['limit']) || !ctype_digit((string) $args['limit'])) {
        $args['limit'] = '999';
    }

    if (isset($args['location_postcode']) && strlen($args['location_postcode']) === 1 && ctype_digit($args['location_postcode'])) {
        $postcode_first_char = $args['location_postcode'];
        add_filter('em_locations_output_locations', 'my_em_locations_output_locations'); // Add the filter
    } else {
        $postcode_first_char = null;
    }

    $ret = em_get_locations_list_shortcode($args, $formats); // Call the locations list function

    if ($postcode_first_char !== null) {
        remove_filter('em_locations_output_locations', 'my_em_locations_output_locations');              // Remove the filter after use
    }

    return $ret;
}

function my_em_locations_output_locations($locations) {
    global $postcode_first_char;

    if ($postcode_first_char === null) {
        return $locations;
    }

    $new_locations = [];

    foreach ($locations as $EM_location) {
        // Ensure location_postcode exists and the first char matches
        if (!empty($EM_location->location_postcode) && $EM_location->location_postcode[0] == $postcode_first_char) {
            $new_locations[] = $EM_location;
        }
    }

    return $new_locations;
}

• This reply was modified 1 year, 1 month ago by joneiseman.
• This reply was modified 1 year, 1 month ago by joneiseman.

I used ChatGPT to generate code to create a shortcode to put the locations on a map:

function google_map_shortcode($atts) {
    // Extract attributes (if any)
    $atts = shortcode_atts(
        array(
            'width' => '100%',
            'height' => '500px',
            'scope' => 'all'  // default scope for EM_Locations::get
        ),
        $atts,
        'google_map'
    );

    // Get markers data with $atts
    $markers = get_markers($atts);

    // Start output buffering
    ob_start();
    ?>
    <div id="map" style="height: <?php echo esc_attr($atts['height']); ?>; width: <?php echo esc_attr($atts['width']); ?>;"></div>

    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>
    <script>
        function initMap() {
            // PHP array of markers
            var markers = <?php echo json_encode($markers); ?>;

            // Calculate the center of the map
            var latSum = 0;
            var lngSum = 0;
            for (var i = 0; i < markers.length; i++) {
                latSum += markers[i].coords.lat;
                lngSum += markers[i].coords.lng;
            }
            var centerLat = latSum / markers.length;
            var centerLng = lngSum / markers.length;

            // Map options
            var options = {
                zoom: 4,
                center: {lat: centerLat, lng: centerLng}
            };

            // New map
            var map = new google.maps.Map(document.getElementById('map'), options);

            // Loop through markers
            for(var i = 0; i < markers.length; i++){
                addMarker(markers[i]);
            }

            // Add Marker Function
            function addMarker(props){
                var marker = new google.maps.Marker({
                    position: props.coords,
                    map: map
                });

                // Check content
                if(props.content){
                    var infoWindow = new google.maps.InfoWindow({
                        content: props.content
                    });

                    marker.addListener('click', function(){
                        infoWindow.open(map, marker);
                    });
                }
            }
        }

        // Load map when page is ready
        document.addEventListener('DOMContentLoaded', function() {
            initMap();
        });
    </script>
    <?php
    // Return the buffered content
    return ob_get_clean();
}

// Register the shortcode
add_shortcode('google_map', 'google_map_shortcode');

// Function to get markers data from Events Manager locations
function get_markers($atts) {
    $markers = [];
    
    // Check if the Events Manager plugin is active
    if (class_exists('EM_Locations')) {
        // Get locations based on attributes
        $em_locations = EM_Locations::get($atts);
        
        foreach ($em_locations as $location) {
            $lat = $location->location_latitude;
            $lng = $location->location_longitude;
            $content = '<h1>' . esc_html($location->location_name) . '</h1><a href="' . esc_url($location->get_permalink()) . '" target="_blank">More info</a>';
            
            $markers[] = [
                'coords' => ['lat' => (float) $lat, 'lng' => (float) $lng],
                'content' => $content
            ];
        }
    }
    
    return $markers;
}

Don’t forget to change YOUR_API_KEY to your actual Google API key.