how to get all markers on google-maps-v3

If you mean “how can I get a reference to all markers on a given map” – then I think the answer is “Sorry, you have to do it yourself”. I don’t think there is any handy “maps.getMarkers()” type function: you have to keep your own references as the points are created:

var allMarkers = [];
....
// Create some markers
for(var i = 0; i < 10; i++) {
    var marker = new google.maps.Marker({...});
    allMarkers.push(marker);
}
...

Then you can loop over the allMarkers array to and do whatever you need to do.

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