How to find distance between any two markers on Google MAP javascript

Question

I have a javascript which fetches many Latlong from database and put it on Google Map. Now I want to find distance between any two markers. I have serched but was unable to find relevant information..

My Script is as below..

var map,infoWindow;



function getData() {
    
     var lat1 = map.getCenter().lat();  
     var lng1= map.getCenter().lng();
     var zoom1 = map.getZoom();
      
      
     map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(lat1, lng1),
        zoom: zoom1,
        mapTypeId: 'roadmap'
      });
      
      
     infoWindow = new google.maps.InfoWindow;
   
     downloadUrl("http://x.x.x.x/rfplan/getsitedata_1.php?ssa="+$("#ssa option:selected").text() +
            "&type="+$("#type option:selected").val() +
            "&make="+$("#make option:selected").val() +
            "&comm="+$("#comm option:selected").val() +
            "&sev="+$("#sev option:selected").val() +
            "&include="+$("#include option:selected").val() +
            "&can="+$("#cand option:selected").val() +
            "&ip_vand="+$("#vand option:selected").val(), function(data){
                
                
                var xml = data.responseXML;
                var markers = xml.documentElement.getElementsByTagName("marker");
                for (var i = 0; i < markers.length; i++) {
                  var address = markers[i].getAttribute("info");
                  var point = new google.maps.LatLng(
                      parseFloat(markers[i].getAttribute("latitude")),
                      parseFloat(markers[i].getAttribute("longitude")));
                  var html = "<b>" + name + "</b> <br/>" + address;
                  var icon = customIcons[markers[i].getAttribute("color")] || {};
                  var marker = new google.maps.Marker({
                    map: map,
                    position: point,
                    icon: icon.icon
                  });
                  bindInfoWindow(marker, map, infoWindow, html);
                }
            
                           
        });    
        
        
        
    
}





function proc(){
    
    
}




    function load() {
       map = new google.maps.Map(document.getElementById("map"), {
        center: new google.maps.LatLng(22, 71),
        zoom: 7
        mapTypeId: 'roadmap',
      });
       infoWindow = new google.maps.InfoWindow;
    }
    
    function bindInfoWindow(marker, map, infoWindow, html) {
      google.maps.event.addListener(marker, 'click', function() {
        infoWindow.setContent(html);
        infoWindow.open(map, marker);
      });
    }

    function downloadUrl(url, callback) {
      var request = window.ActiveXObject ?
          new ActiveXObject('Microsoft.XMLHTTP') :
          new XMLHttpRequest;

      request.onreadystatechange = function() {
        if (request.readyState == 4) {
          request.onreadystatechange = doNothing;
          callback(request, request.status);
        }
      };
            request.open('GET', url, true);
      request.send(null);
    }

    function doNothing() {}
    

Answer 1

Please try below code:

    <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false&libraries=geometry"></script>

    <script>
    //calculates distance between two points in km's
    function calcDistance(p1, p2) {
      return (google.maps.geometry.spherical.computeDistanceBetween(p1, p2) / 1000).toFixed(2);
    }

   var cordinateArr;
   //add this event in gmap script 

    google.maps.event.addListener(marker, "click", function (event) {
      cordinateArr.push(this.position);
      if(cordinateArr.length==2)
      {

        alert(calcDistance(cordinateArr[0], cordinateArr[1]));
        cordinateArr = [];
      }
     }); //end addListener
    </script>

Answer 2

Try to use Geometry Lilbrary Google Map Documentation here: https://developers.google.com/maps/documentation/javascript/geometry