javascript - Get Coordinates of tile in google map api v3 -

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in example below maptype overlay https://developers.google.com/maps/documentation/javascript/examples/maptype-overlay

i want county names covered under tile, when click tile. tried attaching event overlay object as:

var gridoverlay = new coordmaptype(new google.maps.size(256, 256));   map.overlaymaptypes.insertat(0, gridoverlay);   google.maps.event.addlistener(gridoverlay, 'click', function(evt) {     // tile coords      console.log(evt);   });


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