Google Maps API v3: How to remove all markers?

Question

In Google Maps API v2, if I wanted to remove all the map markers, I could simply do:

map.clearOverlays();

How do I do this in Google Maps A

Answer 1

On the new version v3, They recommended to keep in arrays. as following.

See sample at overlay-overview.

var map;
var markersArray = [];

function initialize() {
  var haightAshbury = new google.maps.LatLng(37.7699298, -122.4469157);
  var mapOptions = {
    zoom: 12,
    center: haightAshbury,
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };
  map =  new google.maps.Map(document.getElementById("map_canvas"), mapOptions);

  google.maps.event.addListener(map, 'click', function(event) {
    addMarker(event.latLng);
  });
}

function addMarker(location) {
  marker = new google.maps.Marker({
    position: location,
    map: map
  });
  markersArray.push(marker);
}

// Removes the overlays from the map, but keeps them in the array
function clearOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(null);
    }
  }
}

// Shows any overlays currently in the array
function showOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(map);
    }
  }
}

// Deletes all markers in the array by removing references to them
function deleteOverlays() {
  if (markersArray) {
    for (i in markersArray) {
      markersArray[i].setMap(null);
    }
    markersArray.length = 0;
  }
}