need to add multiple markers using custom google map api - google-maps

Question

i was checking out the google map api to integrate in my website.
made this page with what ever i could understand so far.
everything is working fine but there is just one thing, that i want three markers on the same map.
when i am adding more than one markers then the map stops working.
test link : http://goo.gl/X9q92s
you will have a better understanding if u see my link.
this is the code that i got from google map api.
and i edited it to get grey scale map with my desired marker box.
i just want to add two more....
Please help.
<script>
function initialize() {
var myLatlng = new google.maps.LatLng(-25.363882,131.044922);
var mapOptions = {
zoom: 4,
center: myLatlng
}
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: 'Hello World!'
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>

Answer 1

You should place your "new marker" code into its own function, like so:
function LoadMarkers(name, lat, lng) {
var MarkerLatLng = new google.maps.LatLng(lat, lng);
var MarkerOption = { map: map, position: MarkerLatLng, title: name};
var Marker = new google.maps.Marker(MarkerOption);
}
Putting this into its own function allows you to "refresh" the markers with ease, by simply invoking the function with a timer or some other event. A program I'm working on refreshes the map every few seconds, as my data source is constantly changing with new/removed/updated records that should be reflected immediately on the map. I think this is a great way to do this.
Then, in your program, you can create a loop that shoots the information for each marker in by invoking the LoadMarkers function. I've recently fallen in love with SqlDataReader.
Your loop would iterate through a SqlDataReader and each record read will invoke the script like so:
InvokeScript("LoadMarkers", New Object() {name, lat, lng})
This is a great moment to also add an InfoWindow for each marker.
var infowindow = new google.maps.InfoWindow(
{
content: "Content here"
});
As well as a click listener for the InfoWindows. ;)
google.maps.event.addListener(Marker, 'click', function () {
typeof infoWindowsOpenCurrently !== 'undefined' && infoWindowsOpenCurrently.close(); //If there is an InfoWindow currently open, close it
infowindow.open(map, Marker); //Open a new one for the selected marker
infoWindowsOpenCurrently = infowindow; //Set the new info window to the temporary variable
});
Some might not like this method of using a loop. I like it because I can "personalize" each marker for each record, while personalizing each of their InfoWindows too. In my code above, assume that "name" is a unique ID that lets you specify a specific marker for later use, such as identifying which marker was clicked and which InfoWindow is currently open.