CODEWITHSUNDEEP
phpjavascriptajaxgoogle-maps
compcobalt
compcobalt

Reputation: 1362

Google Maps - Finding all the markers inside a given radius Javascript/Php

I have this script that will show custom markers on a google map, but I would like to include a input text-box and be able to enter a city/state and a zip-code and see if there are any markers within lets say 400 miles from that city/state or zip-code. I would love it if the map can be dynamic so as you type out the city/state or zip-code it will show the results on the map by getting rid of all the other markers and leaving only the one that is within that radius, if that is too hard then a simple alter box saying what unit is the closest will also be OK :) I searched and found some say that I should load the geometry library and use computeDistanceBetween() to find the distance of each marker from your center point but I have no idea how to do the zip-code part or how to put all of this together to work.

Here is my code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
<script type="text/javascript"  src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclustererplus/src/markerclusterer.js"></script>

<script type="text/javascript"> 
   var image = new google.maps.MarkerImage("marker-images/image.png",new google.maps.Size(40,35),new google.maps.Point(0,0),new google.maps.Point(20,35));

   var shadow = new google.maps.MarkerImage(
                            'marker-images/shadow.png',
                            new google.maps.Size(62,35),
                            new google.maps.Point(0,0),
                            new google.maps.Point(20,35)
                          );

   var shape = {
                coord: [27,0,30,1,32,2,34,3,35,4,36,5,38,6,39,7,39,8,39,9,39,10,38,11,37,12,33,13,34,14,34,15,33,16,32,17,31,18,27,19,28,20,28,21,27,22,26,23,22,25,23,26,24,27,24,28,24,29,24,30,24,31,24,32,23,33,22,34,17,34,16,33,15,32,15,31,14,30,14,29,15,28,15,27,16,26,17,25,13,23,12,22,11,21,11,20,12,19,8,18,7,17,6,16,5,15,5,14,6,13,2,12,1,11,0,10,0,9,0,8,0,7,1,6,3,5,4,4,5,3,7,2,9,1,12,0,27,0],
                type: 'poly'
          };

     // this variable will collect the html which will eventually be placed in the side_bar 
     var side_bar_html = ""; 

     // arrays to hold copies of the markers and html used by the side_bar 
     // because the function closure trick doesnt work there 
     var gmarkers = []; 

     // global "map" variable
     var map = null;
     var circle = null;

     //marker clusterer
     var mc;
     var mcOptions = {gridSize: 10, maxZoom: 8};

     //global infowindow
     var infowindow = new google.maps.InfoWindow();

     //geocoder
     var geocoder = new google.maps.Geocoder(); 
     var address = new Array("41.8119,-87.6873",
                        "40.7888,-74.056",
                        "41.8119,-87.6873",
                        "48.6681,-97.3627",
                        "44.9793,-93.273",
                        "39.4857,-75.6775",
                        "41.8119,-87.6873",
                        "42.0203,-87.9059",
                        "32.7812,-96.7903",
                        "27.5159,-99.4941",
                        "32.7812,-96.7903",
                        "37.5608,-95.6684",
                        "41.8119,-87.6873",
                        "38.3763,-97.6702",
                        "42.2458,-83.2491",
                        "41.8122,-91.9139",
                        "41.8397,-88.0887",
                        "41.8397,-88.0887",
                        "38.5128,-122.787",
                        "41.8397,-88.0887",
                        "42.8863,-87.892",
                        "42.8863,-87.892",
                        "30.7539,-83.3321",
                        "39.889,-84.2422",
                        "34.106,-83.589");
     var content = new Array("Unit No# 0206",
                        "Unit No# #2003",
                        "Unit No# 0176",
                        "Unit No# #2001",
                        "Unit No# 0124",
                        "Unit No# 0157",
                        "Unit No# #0162",
                        "Unit No# 0104",
                        "Unit No# 0118",
                        "Unit No# #2007",
                        "Unit No# 0112",
                        "Unit No# 0139",
                        "Unit No# 0205",
                        "Unit No# 0127",
                        "Unit No# 0187",
                        "Unit No# 0105",
                        "Unit No# 0214",
                        "Unit No# 0186",
                        "Unit No# 0173",
                        "Unit No# 0134",
                        "Unit No# 0128",
                        "Unit No# 0125",
                        "Unit No# 0158",
                        "Unit No# 0193",
                        "Unit No# 0201");

     //min and max limits for multiplier, for random numbers
     //keep the range pretty small, so markers are kept close by
     var min = .999999;
            var max = 1.000001;

    function createMarker(latlng,text) {
      var marker = new google.maps.Marker({
         draggable: false,
         raiseOnDrag: false,
         icon: image,
         shadow: shadow,
         shape: shape,
         position: latlng,
         map: map
       });

     ///get array of markers currently in cluster
     var allMarkers = mc.getMarkers();

     //check to see if any of the existing markers match the latlng of the new marker
      if (allMarkers.length != 0) {
        for (i=0; i < allMarkers.length; i++) {
          var existingMarker = allMarkers[i];
          var pos = existingMarker.getPosition();

          if (latlng.equals(pos)) {
            text = text + " & " + content[i];
          }                   
        }
      }

      google.maps.event.addListener(marker, 'click', function() {
        infowindow.close();
        infowindow.setContent(text);
        infowindow.open(map,marker);
      });
      mc.addMarker(marker);
      return marker;
    }
    function initialize(){
        var options = { 
            zoom: 4, 
            center: new google.maps.LatLng(39.8282,-98.5795), 
            mapTypeId: google.maps.MapTypeId.ROADMAP 
        };
        map = new google.maps.Map(document.getElementById('map'), options); 

    //marker cluster
        var gmarkers = [];
        mc = new MarkerClusterer(map, [], mcOptions);
        for (i=0; i<address.length; i++) {
           var ptStr = address[i];
           var coords = ptStr.split(",");
           var latlng = new google.maps.LatLng(parseFloat(coords[0]),parseFloat(coords[1]));
           gmarkers.push(createMarker(latlng,content[i]));
        }
    }

          function codeAddress() {
            var address = document.getElementById('address').value;
            var radius = parseInt(document.getElementById('radius').value, 10) * 1609.34;
            geocoder.geocode( { 'address': address}, function(results, status) {
              if (status == google.maps.GeocoderStatus.OK) {
                map.setCenter(results[0].geometry.location);
                var marker = new google.maps.Marker({
            //        map: map,  <-- uncomment to show red marker
                    position: results[0].geometry.location
                });
                if (circle) circle.setMap(null);
                circle = new google.maps.Circle({center:marker.getPosition(),
                                                 radius: radius,
                                                 fillOpacity: 0.35,
                                                 fillColor: "#FF0000",
                                                 map: map});
                var bounds = new google.maps.LatLngBounds();
            var foundMarkers = 0;
                for (var i=0; i<gmarkers.length;i++) {
                  if (google.maps.geometry.spherical.computeDistanceBetween(gmarkers[i].getPosition(),marker.getPosition()) < radius) {
                    bounds.extend(gmarkers[i].getPosition())
                    gmarkers[i].setMap(map);
            foundMarkers++;
                  } else {
                    gmarkers[i].setMap(null);
                  }
                }
                if (foundMarkers > 0) {
                  map.fitBounds(bounds);
            } else {
                  map.fitBounds(circle.getBounds());
                }
              } else {
                alert(status);
              }
            });
          }

    var infowindow = new google.maps.InfoWindow(
      { 
        size: new google.maps.Size(150,50)
      });


    function handleKeyPress(e){
     var key=e.keyCode || e.which;
      if (key==13){
         codeAddress();
      }
    }

    function handleResetKeyPress(e){
        if (map.getZoom() != 4) map.setZoom(4);
          map.setCenter(new google.maps.LatLng(39.8282, -98.5795));
        document.getElementById("address").value = 'Enter City,State or Zipcode';
        document.getElementById("radius").value = '200';
    }
    </script> 

    <style>
    html, body, #map {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    }
    .auto-style1 {
        text-align: center;
    }
      #footer {
        position : absolute;
        bottom : 0;
        height : 40px;
        margin-top : 40px;
     /* border: 1px solid blue; */
      }
    </style>
    </head>
    <body onload='initialize()'>
    <div id="map"></div>
    <div id="footer" class="auto-style1" style="left: 0px; bottom: 0; width: 100%">
          <input type="text" id="address" value="Enter City,State or Zipcode" onclick="if(this.value=='Enter City,State or Zipcode'){this.value=''}" onblur="if(this.value==''){this.value='Enter City,State or Zipcode'}" onkeypress="handleKeyPress(event);" style="width: 183px">
          <input type="button" value="Search" onclick="codeAddress();">
          <input type="button" value="Reset" onclick="handleResetKeyPress();">
          <input type="text" id="radius" value="200" style="width: 42px" onclick="if(this.value=='200'){this.value=''}" onblur="if(this.value==''){this.value='200'}" onkeypress="handleKeyPress(event);"> miles
    </div>
    </body>
</html>

Upvotes: 10

Views: 34796

Answers (2)

Matej P.
Matej P.

Reputation: 5383

Here is a working example.

The example uses all_locations - array of example locations.

You can replace that with your locations (e.g. locations you fetch from your DB). You can insert any address to the input bar, e.g. '123 New Street, New York, 56789, NY' and using google.maps.Geocoder the code will geocode that map into LatLng location around which it will draw a radius. Only locations that fall within the radius around the address will show on map. To see the example locations, input "Second Steet, New York" as address. 

var map = null;
  var radius_circle;
  var markers_on_map = [];
  var geocoder;
  var infowindow;
  
  //all_locations is just a sample, you will probably load those from database
  var all_locations = [
	  {type: "Restaurant", name: "Restaurant 1", lat: 40.723080, lng: -73.984340},
	  {type: "School", name: "School 1", lat: 40.724705, lng: -73.986611},
	  {type: "School", name: "School 2", lat: 40.724165, lng: -73.983883},
	  {type: "Restaurant", name: "Restaurant 2", lat: 40.721819, lng: -73.991358},
	  {type: "School", name: "School 3", lat: 40.732056, lng: -73.998683}
  ];

  //initialize map on document ready
  $(document).ready(function(){
      var latlng = new google.maps.LatLng(40.723080, -73.984340); //you can use any location as center on map startup
      var myOptions = {
        zoom: 1,
        center: latlng,
        mapTypeControl: true,
        mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU},
        navigationControl: true,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      };
      map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
	  geocoder = new google.maps.Geocoder();
      google.maps.event.addListener(map, 'click', function(){
           if(infowindow){
             infowindow.setMap(null);
             infowindow = null;
           }
      });
  });
  
  function showCloseLocations() {
  	var i;
  	var radius_km = $('#radius_km').val();
  	var address = $('#address').val();

  	//remove all radii and markers from map before displaying new ones
  	if (radius_circle) {
  		radius_circle.setMap(null);
  		radius_circle = null;
  	}
  	for (i = 0; i < markers_on_map.length; i++) {
  		if (markers_on_map[i]) {
  			markers_on_map[i].setMap(null);
  			markers_on_map[i] = null;
  		}
  	}

  	if (geocoder) {
  		geocoder.geocode({'address': address}, function (results, status) {
  			if (status == google.maps.GeocoderStatus.OK) {
  				if (status != google.maps.GeocoderStatus.ZERO_RESULTS) {
  					var address_lat_lng = results[0].geometry.location;
  					radius_circle = new google.maps.Circle({
  						center: address_lat_lng,
  						radius: radius_km * 1000,
  						clickable: false,
						map: map
  					});
                    if (radius_circle) map.fitBounds(radius_circle.getBounds());
  					for (var j = 0; j < all_locations.length; j++) {
  						(function (location) {
  							var marker_lat_lng = new google.maps.LatLng(location.lat, location.lng);
  							var distance_from_location = google.maps.geometry.spherical.computeDistanceBetween(address_lat_lng, marker_lat_lng); //distance in meters between your location and the marker
  							if (distance_from_location <= radius_km * 1000) {
  								var new_marker = new google.maps.Marker({
  									position: marker_lat_lng,
  									map: map,
  									title: location.name
  								});      								google.maps.event.addListener(new_marker, 'click', function () {
                                    if(infowindow){
             infowindow.setMap(null);
             infowindow = null;
           }
  									infowindow = new google.maps.InfoWindow(
            { content: '<div style="color:red">'+location.name +'</div>' + " is " + distance_from_location + " meters from my location",
              size: new google.maps.Size(150,50),
              pixelOffset: new google.maps.Size(0, -30)
            , position: marker_lat_lng, map: map});
  								});
  								markers_on_map.push(new_marker);
  							}
  						})(all_locations[j]);
  					}
  				} else {
  					alert("No results found while geocoding!");
  				}
  			} else {
  				alert("Geocode was not successful: " + status);
  			}
  		});
  	}
  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
        google.load("maps", "3",{other_params:"sensor=false&libraries=geometry"});
      </script>

<body style="margin:0px; padding:0px;" >
 <input id="address" value="Second Steet, New York" placeholder="Input Address"/>
 <select id="radius_km">
	 <option value=1>1km</option>
	 <option value=2>2km</option>
	 <option value=5>5km</option>
	 <option value=30>30km</option>
 </select>
 <button onClick="showCloseLocations()">Show Locations In Radius</button>
 <div id="map_canvas"  style="width:500px; height:300px;">
</body>
</html>

Upvotes: 10

max
max

Reputation: 102036

Here is an example of how you could solve this with the geocoding API and some simple geometry.

(Note that I have hardcoded the address and radius for brevity.) 

// we assume that you have an array of markers
var markers = [];

//In order to lookup the the position of a zip-code you can use the geocoding API:
// https://developers.google.com/maps/documentation/geocoding/
var geocode_api_base_url = "http://maps.googleapis.com/maps/api/geocode/json?";
var params = {
    adress : 05673,
    components : "country:us",
    sensor : false
}
// This is the result set of markers in area
var in_area = [];

//  http://maps.googleapis.com/maps/api/geocode/json?address=05673&components=country:US&sensor=false
$.getJSON( geocode_api_base_url + $.param(params), function(data) {

    var location, search_area, in_area = [];

    location = data['results'][0]['address_components']['geometry']['location'];

    // We create a circle to look within:
    search_area = {
        strokeColor: '#FF0000',
        strokeOpacity: 0.8,
        strokeWeight: 2,
        center : new google.maps.LatLng(location.lat, location.lon),
        radius : 500
    }

    search_area = new google.maps.Circle(search_area);

    $.each(markers, function(i,marker) {
       if (google.maps.geometry.poly.containsLocation(marker.getPosition(), search_area)) {
         in_area.push(marker);
       }
    });

    console.info(in_area);

});

Upvotes: 4

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