How to handle multiple makers at same location in Google Maps API?
<p>I know there are some answers on this already, but I havne't been able to figure it out. I'm using Google Maps with Advanced Custom Fields in WordPress.</p>

<p>I pull the locations from the ACF and this then generates the maps.</p>

<p>However, the some of the locations are the same; so the infowindow only shows one title and the others are totally hidden.</p>

<p>I would be fine if the markers are slightly spreak apart.</p>

<p>I would also be okay if the infowindow could include all of the titles of all of the posts that are in the same location.</p>

<p>Can anyone help?</p>

<p>This is the current code:</p>

<pre><code>&lt;script src="http://www.google.com/jsapi?key=ABQIAAAArX_FiOGh9BVSA-VaKWxf3BTjV82plXfzb-h9w4F1dGZTQrT8wxSgksN4vLUdfoCX3U-gz7r_GPkm2A" type="text/javascript"&gt;&lt;/script&gt;
&lt;script type="text/javascript"&gt;
google.load("jquery", "1.7.1");
google.load("jqueryui", "1.8.16");
&lt;/script&gt;
&lt;script src="https://maps.googleapis.com/maps/api/js?v=3.exp&amp;sensor=false"&gt;&lt;/script&gt;
&lt;script type="text/javascript"&gt;
(function($) {

/*
*  render_map
*
*  This function will render a Google Map onto the selected jQuery element
*
*  @type    function
*  @date    8/11/2013
*  @since   4.3.0
*
*  @param   $el (jQuery element)
*  @return  n/a
*/

function render_map( $el ) {

// var
var $markers = $el.find('.marker');

// vars
var args = {
    zoom        : 16,
    center      : new google.maps.LatLng(0, 0),
    mapTypeId   : google.maps.MapTypeId.ROADMAP
};

// create map
var map = new google.maps.Map( $el[0], args);

// add a markers reference
map.markers = [];

// add markers
$markers.each(function(){

    add_marker( $(this), map );

});

// center map
center_map( map );

}

// create info window outside of each - then tell that singular infowindow to swap content based on click
var infowindow = new google.maps.InfoWindow({
content     : ''
});

/*
*  add_marker
*
*  This function will add a marker to the selected Google Map
*
*  @type    function
*  @date    8/11/2013
*  @since   4.3.0
*
*  @param   $marker (jQuery element)
*  @param   map (Google Map object)
*  @return  n/a
*/

function add_marker( $marker, map ) {

// var
var latlng = new google.maps.LatLng( $marker.attr('data-lat'), $marker.attr('data-lng') );

// create marker
var marker = new google.maps.Marker({
    position    : latlng,
    map         : map
});

// add to array
map.markers.push( marker );

// if marker contains HTML, add it to an infoWindow
if( $marker.html() )
{

    // show info window when marker is clicked &amp; close other markers
    google.maps.event.addListener(marker, 'click', function() {
        //swap content of that singular infowindow
                infowindow.setContent($marker.html());
                infowindow.open(map, marker);
    });

    // close info window when map is clicked
         google.maps.event.addListener(map, 'click', function(event) {
            if (infowindow) {
                infowindow.close(); }
            });

}

}

/*
*  center_map
*
*  This function will center the map, showing all markers attached to this map
*
*  @type    function
*  @date    8/11/2013
*  @since   4.3.0
*
*  @param   map (Google Map object)
*  @return  n/a
*/

function center_map( map ) {

// vars
var bounds = new google.maps.LatLngBounds();

// loop through all markers and create bounds
$.each( map.markers, function( i, marker ){

    var latlng = new google.maps.LatLng( marker.position.lat(), marker.position.lng() );

    bounds.extend( latlng );

});

// only 1 marker?
if( map.markers.length == 1 )
{
    // set center of map
    map.setCenter( bounds.getCenter() );
    map.setZoom( 16 );
}
else
{
    // fit to bounds
    map.fitBounds( bounds );
}

}



/*
*  document ready
*
*  This function will render each map when the document is ready (page has loaded)
*
*  @type    function
*  @date    8/11/2013
*  @since   5.0.0
*
*  @param   n/a
*  @return  n/a
*/

$(document).ready(function(){

$('.acf-map').each(function(){

    render_map( $(this) );

});

    });

    })(jQuery);
    &lt;/script&gt;
</code></pre>