Google Maps V3 - Load different markers on click function - google-maps

Question

So I have the following in my HTML which represents regions in the UK:-
<h4 id="google-ne" class="active">The North East</h4>
<h4 id="google-nw">The North West</h4>
<h4 id="google-ea">East Anglia</h4>
<h4 id="google-em">East Midlands</h4>
<h4 id="google-tm">The Midlands</h4>
<h4 id="google-wm">West Midlands</h4>
<h4 id="google-ld">London</h4>
<h4 id="google-se">South East</h4>
<h4 id="google-sw">South West</h4>
<h4 id="google-ws">Wales</h4>
<h4 id="google-sl">Scotland</h4>
and then the marker lat / long and region are displayed in HTML as follows:-
<div class="marker" data-lat="52.559437" data-lng="-2.1493073" data-region="West Midlands"></div>
<div class="marker" data-lat="51.646145" data-lng="-0.45614472" data-region="South East"></div>
and so on, there are about 400 markers.
I am currently using the following code to display all markers on the map which is working fine:-
var center = new google.maps.LatLng(51.5280359,-0.1304897);
function initialize_map() {
var map;
var bounds = new google.maps.LatLngBounds();
var mapOptions = {
mapTypeId: 'roadmap'
};
var markerBounds = new google.maps.LatLngBounds();
var w = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
var isDraggable = w > 480 ? true : false;
var mapOptions = {
zoom: 8,
center: center,
//draggable: isDraggable,
//mapTypeControl: false,
//draggable: false,
zoomControl: true,
mapTypeControl: true,
scaleControl: true,
scrollwheel: true,
navigationControl: true,
streetViewControl: true,
disableDefaultUI: true
};
var map = new google.maps.Map(document.getElementById('map'),
mapOptions);
// Multiple Markers
// Loop through our array of markers & place each one on the map
$('.marker').each(function() {
var location = {
latLng: new google.maps.LatLng(
$( this ).data( 'lat' ),
$( this ).data( 'lng' )
),
//title: $( this ).find( 'h2' ).html()
};
new google.maps.Marker( {
map: map,
position: location.latLng,
//title: $( this ).data( 'desc' )
} );
markerBounds.extend( location.latLng );
});
// Override our map zoom level once our fitBounds function runs (Make sure it only runs once)
var boundsListener = google.maps.event.addListener((map), 'bounds_changed', function(event) {
this.setZoom(14);
google.maps.event.removeListener(boundsListener);
});
var styles = [
/* Black & White {"featureType":"water","elementType":"geometry","stylers":[{"color":"#e9e9e9"},{"lightness":17}]},{"featureType":"landscape","elementType":"geometry","stylers":[{"color":"#f5f5f5"},{"lightness":20}]},{"featureType":"road.highway","elementType":"geometry.fill","stylers":[{"color":"#ffffff"},{"lightness":17}]},{"featureType":"road.highway","elementType":"geometry.stroke","stylers":[{"color":"#ffffff"},{"lightness":29},{"weight":0.2}]},{"featureType":"road.arterial","elementType":"geometry","stylers":[{"color":"#ffffff"},{"lightness":18}]},{"featureType":"road.local","elementType":"geometry","stylers":[{"color":"#ffffff"},{"lightness":16}]},{"featureType":"poi","elementType":"geometry","stylers":[{"color":"#f5f5f5"},{"lightness":21}]},{"featureType":"poi.park","elementType":"geometry","stylers":[{"color":"#dedede"},{"lightness":21}]},{"elementType":"labels.text.stroke","stylers":[{"visibility":"on"},{"color":"#ffffff"},{"lightness":16}]},{"elementType":"labels.text.fill","stylers":[{"saturation":36},{"color":"#333333"},{"lightness":40}]},{"elementType":"labels.icon","stylers":[{"visibility":"off"}]},{"featureType":"transit","elementType":"geometry","stylers":[{"color":"#f2f2f2"},{"lightness":19}]},{"featureType":"administrative","elementType":"geometry.fill","stylers":[{"color":"#fefefe"},{"lightness":20}]},{"featureType":"administrative","elementType":"geometry.stroke","stylers":[{"color":"#fefefe"},{"lightness":17},{"weight":1.2}]} */
/* Colour*/ {"featureType":"landscape.man_made","elementType":"geometry.fill","stylers":[{"saturation":"-63"},{"lightness":"23"}]},{"featureType":"landscape.natural","elementType":"geometry.fill","stylers":[{"saturation":"-100"},{"lightness":"25"}]},{"featureType":"landscape.natural.terrain","elementType":"geometry.fill","stylers":[{"saturation":"0"}]},{"featureType":"poi.park","elementType":"geometry.fill","stylers":[{"saturation":"0"},{"color":"#95bf97"},{"lightness":"59"}]},{"featureType":"poi.school","elementType":"geometry.fill","stylers":[{"lightness":"5"},{"hue":"#ff0000"},{"saturation":"-100"}]},{"featureType":"poi.sports_complex","elementType":"geometry.fill","stylers":[{"lightness":"5"},{"saturation":"-100"}]},{"featureType":"road.local","elementType":"geometry.fill","stylers":[{"saturation":"-85"},{"lightness":"12"}]}
];
map.setOptions({styles: styles});
}
initialize_map();
}
What I want to do now is on click of say 'West Midlands' #google-wm, it removes all markers currently on the map and then only shows markers where the data-region == 'West Midlands'
How is it possible to do this?
Thanks in advance.

Answer 1

You could do something like that. Code is commented for the parts that I have added/changed.
var markers = [];
var map;
function initialize() {
var myLatLng = new google.maps.LatLng(52, -1);
var mapOptions = {
zoom: 6,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);
$('.marker').each(function() {
var location = {
latLng: new google.maps.LatLng(
$(this).data('lat'),
$(this).data('lng')
),
};
var marker = new google.maps.Marker({
map: map,
position: location.latLng,
});
// Register click event
$(this).on('click', function() {
clickMarker($(this).data('region'));
});
// Push marker and region to markers array
markers.push({
'marker': marker,
'region': $(this).data('region')
});
});
}
function clickMarker(region) {
// Loop through markers array
for (var i = 0; i < markers.length; i++) {
// If marker region = selected region, display it
if (markers[i].region === region) {
markers[i].marker.setMap(map);
} else {
// Hide marker from different region
markers[i].marker.setMap(null);
}
}
}
initialize();
#map-canvas {
height: 150px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="map-canvas"></div>
<div class="marker" data-lat="52.5" data-lng="-2.1" data-region="West Midlands">Marker 1 - WM</div>
<div class="marker" data-lat="52.6" data-lng="-2.2" data-region="West Midlands">Marker 2 - WM</div>
<div class="marker" data-lat="51.6" data-lng="-0.4" data-region="South East">Marker 3 - SE</div>
<div class="marker" data-lat="51.7" data-lng="-0.5" data-region="South East">Marker 4 - SE</div>
<script src="https://maps.googleapis.com/maps/api/js"></script>