javascript - Colour the first marker of a Google Map a different colour

Question

I'm sure this must be very easy, but I'm a novice at Javascript...

I have the following code to display a list of points on a google map:

<script type="text/javascript">     
var locations = [
                    ['<b>Customer</b><br>Address', 52.6699927, -0.7274620, 1],
                    ['<b>Leicester</b><br>Unit B, St Margarets Way, Leicester<br>0116 262 7355', 52.646179, -1.14004, 2],
                    ['<b>Nottingham</b><br>Victoria Retail Park, Netherfield, Nottingham<br>0115 940 0811', 52.961685, -1.06394, 3],
                    ['<b>Nuneaton</b><br>Newtown Road Nuneaton Warwickshire<br>02476 642220', 52.5245, -1.46764, 4],
                    ['<b>Peterborough</b><br>Mallory Road, Boongate, Peterborough, Cambridgeshire<br>01733 561357', 52.574116, -.219535, 5],
                    ['<b>Wellingborough</b><br>Victoria Retail Park, Whitworth Way, London Road, Wellingborough<br>01933 276225', 52.289585, -.68429, 6]     
                ];      
var map = new google.maps.Map(document.getElementById('map'), 
        {       
            zoom: 9,       
            center: new google.maps.LatLng(52.6699927, -0.7274620),       
            mapTypeId: google.maps.MapTypeId.ROADMAP     
        }
        );      
var infowindow = new google.maps.InfoWindow();      
var marker, i;      

for (i = 0; i < locations.length; i++) {         
            marker = new google.maps.Marker({         
                            position: new google.maps.LatLng(locations[i][1], locations[i][2]),         
                            map: map,
                            });                              
            google.maps.event.addListener(marker, 'click', (function(marker, i) {         return function() 
            {           infowindow.setContent(locations[i][0]);               
                        infowindow.open(map, marker);         
            }       
        })
        (marker, i));     }   


</script> 

The first location in the 'locations' list is the centre of the map, and I would like to change the colour for this marker only. I understand that I can use icon, but am unsure how to adjust the for loop code to do so.

Can you help?

Many thanks in advance.

Answer 1

1. add an icon URL to the end of the first element in your array, something like:

   ['<b>Customer</b><br>Address', 52.6699927, -0.7274620, 1, 'http://maps.google.com/mapfiles/ms/icons/blue.png']
   

2. use that in the definition of your marker (if it isn't there it will be "null" and the default marker will be used).

   marker = new google.maps.Marker({         
          position: new google.maps.LatLng(locations[i][1], locations[i][2]),         
          map: map,
          icon: locations[i][4]
        });
   

working example