How to identify a google map marker on click? - google-maps

Question

I'm creating a Google Map from the developer API v3. It's populated with markers created dynamically from ColdFusion querying an MsSQL database.
<cfloop query="One">
<script>locations[<cfoutput>#One.userID#</cfoutput>
] = new google.maps.LatLng(<cfoutput>#One.latLng#</cfoutput>);
</script>
</cfloop>
I need a way to recognise the marker when its clicked so I can display address details in a box below the map and also higlight markers when a button is clicked lower on the page.

Answer 1

In general, you would typically assign your own custom properties to the Marker. Something like:
function markerClicked(e) {
console.log('Marker ' + marker.myData + ' has been clicked');
}
var marker = new google.maps.Marker(...);
marker.myData = 1; //this could be arbitrary data or even another object
google.maps.event.addListener(marker, 'click', markerClicked);
Adding custom data to any Google Maps API object has risks though. Google's code is obfuscated and the internal (non-documented) properties can and do change. Make sure your property is named in such a way that it won't conflict with any existing property or future property. Tip: Choose a property name longer than 3 letters.
If you are going to minify/compile/compress your maps code, then there are additional considerations.

Answer 2

What about :
google.maps.event.addListener(marker, "click", function (e) {
var clicked = this;
//...
});

Answer 3

This is pretty thoroughly documented/explained in the documentation.
https://developers.google.com/maps/documentation/javascript/overlays#InfoWindows
When you create markers, add dom listeners to the markers like this
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});