title: Google Map API Custom Markers Based on data-marker Value
body: <p>I have a working script which is outputting many markers on a Google Map. What I can't figure out is how to change the custom marker image based on the div data-marker attribute. I haven't been able to merge what I've seen elsewhere with the script I already have in place. The script comes from <a href="https://www.advancedcustomfields.com/resources/google-map/" rel="nofollow noreferrer">Advanced Custom Fields Google Map documentation</a>.</p>
  
  <p>Basically, how do I tell Google to look for the data-marker attribute for the custom marker icon instead of hard coding it in the script the way it is now?</p>
  
  <p>Any input is appreciated.</p>
  
  <pre><code>&lt;div class="marker" data-lat="&lt;?php echo $loc_address_lat; ?&gt;" data-lng="&lt;?php echo $loc_address_lng; ?&gt;" data-marker="&lt;?php echo $map_marker_color; ?&gt;"&gt;
  
  &lt;script type="text/javascript"&gt;
  (function($) { 
  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,
      //mapTypeId : google.maps.MapTypeId.HYBRID
  };
  
  // 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 icon (comment out next line and "icon : image" to disable)
  var image = '/images/custom-pin-light-blue.png';
  
  // 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,
      icon : image // Custom image (comment out to disable)
  });
  
  // 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(){
  
  $('.large-acf-map').each(function(){
  
      render_map( $(this) );
  
  });
  
  });
  
  })(jQuery);
  &lt;/script&gt;
  </code></pre>