Create tooltip on click using marker

style.js

 var point = new google.maps.LatLng(COORDS);
    var data = "SOME_TEXT";
    var infowindow = new google.maps.InfoWindow({
      content: data
    });
    var marker = new google.maps.Marker({
        position: point,
        title:"SOME_TEXT"
    });
    google.maps.event.addListener(marker, 'click', function() {
      infowindow.open(map,marker);
    });