javascript - Find the closest marker to a new marker added Customer Service app -


i working on fast food customer service application call center should able add address of caller (a marker on map) clicking on map has old markers (the branches) , automatically should calculate closest branch marker added.

i add markers array , used this calculation function, nevertheless need know how call function after clicking event , connect new marker added. code follow

identifying branches

var map; var markers = []; var marker, i; var locations = [  ['title a', 3.180967,101.715546, 1],  ['title b', 3.200848,101.616669, 2],  ['title c', 3.147372,101.597443, 3],  ['title d', 3.19125,101.710052, 4]];

the initialization function

function initialize() {    var haightashbury = new google.maps.latlng(3.171368, 101.653404);    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);    });     (i = 0; < locations.length; i++) {         marker = new google.maps.marker({          position: new google.maps.latlng(locations[i][1], locations[i][2]),          map: map       });        google.maps.event.addlistener(marker, 'click', (function(marker, i) {          return function() {             infowindow.setcontent(locations[i][0]);             infowindow.open(map, marker);          }       })(marker, i));        google.maps.event.addlistener(map, 'click', find_closest_marker);     } }

adding new marker

function addmarker(location) {    var marker1 = new google.maps.marker({       position: location,       map: map    });     markers.push(marker);  }

adding new marker array

setallmap(map)  {    (var = 0; < markers.length; i++)    {       markers[i].setmap(map);    } }

calculating function

function rad(x) {return x*math.pi/180;} function find_closest_marker( event ) { var lat = event.latlng.lat(); var lng = event.latlng.lng(); var r = 6371; // radius of earth in km var distances = []; var closest = -1;     for( i=0;i<map.markers.length; i++ ) {        var mlat = map.markers[i].position.lat();        var mlng = map.markers[i].position.lng();        var dlat  = rad(mlat - lat);        var dlong = rad(mlng - lng);        var = math.sin(dlat/2) * math.sin(dlat/2) +        math.cos(rad(lat)) * math.cos(rad(lat)) * math.sin(dlong/2) * math.sin(dlong/2);        var c = 2 * math.atan2(math.sqrt(a), math.sqrt(1-a));        var d = r * c;        distances[i] = d;        if ( closest == -1 || d < distances[closest] ) {           closest = i;        }     }  alert(map.markers[closest].title); }

thank you.

use google maps geometry library calculate distances. both parameters must latlng objects.

google.maps.geometry.spherical.computedistancebetween(markerposition, mainposition);

ofcourse need load geometry library

&libraries=geometry

working example of code in jsfiddle. closest marker printed in console (f12). note comments in code, mistakes fixed.


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