infowindow closing and var (google maps api v3)

I have problem with closing infowindow when new is open in google maps api v.3.

var infowindow;
function addMarker(id, location) {
contentString = 'some content';

var marker = new google.maps.Marker({
  position: location,
 开发者_JS百科 map: map
});

var infowindow = new google.maps.InfoWindow({
    content: contentString,
    maxWidth: 200
});

google.maps.event.addListener(marker, 'click', function() {
  if (infowindow) infowindow.close();  
  infowindow.open(map, marker); 
});

markersArray[id] = marker;
}

The problem is that in above code the old infowindow is not close when new one is clicked unless I delete var from the line var infowindow = new google.maps.InfoWindow({ But then all the infowindows have the same content...

Any help? Thanks.

Use a global variable to contain a pointer to the last opened marker, and when opening a new one, close the previous one. Like this

//var infowindow; // <-- removed; should not be global
var openedInfoWindow = null;  // <-- added this here; make sure it's global

function addMarker(id, location) {
    contentString = 'some content';

    var marker = new google.maps.Marker({
        position: location,
        map: map
    });

    var infowindow = new google.maps.InfoWindow({
        content: contentString,
        maxWidth: 200
    });

    google.maps.event.addListener(marker, 'click', function() {
      if (openedInfoWindow != null) openedInfoWindow.close();  // <-- changed this
      infowindow.open(map, marker); 
      // added next 4 lines
      openedInfoWindow = infowindow;
      google.maps.event.addListener(infowindow, 'closeclick', function() {
          openedInfoWindow = null;
      });
    });

    markersArray[id] = marker;
}