Google maps infowindow showing on wrong marker

Question

I have a piece of javascript code where I create markers and attach InfoWindows to them, like this:

for (var i = 0; i < 8; i++) {
    var marker = new goo         


        

Answer 1

As a new option that was not available 7 years ago:

all modern browsers (which is all browsers supporting ECMAScript 6) support block scoped variables which are defined using the let statement. let initializes a variable inside of a given scope e.g. inside of a loop whereas var defines variables on global or function level. In your case exchanging the var with let will make sure that each marker is properly initialized as a new variable:

for (var i = 0; i < 8; i++) {
    let marker = new google.maps.Marker({
       map: map,
       position: new google.maps.LatLng(lat[i], lng[i]),
       icon: '/static/images/iconsets/gmap/iconb' + (i+1) + '.png',
    });
    let infowindow = new google.maps.InfoWindow({
        content: 'test string'
    });
    google.maps.event.addListener(marker, 'click', function() {
        infowindow.open(map,marker);
    });
}