Google Map Using Javascript
Things that are covered:
- Auto-complete Location using Google Places API
- Zoom Changed Event
- Radius Calculation
- Distance Calculation
Map.html
<!DOCTYPE html> <head> <title>Google Map Using Javascript</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false&libraries=places"></script> <script type="text/javascript" src="googleMap.js"></script> <link type="text/css" rel="stylesheet" href="googleMap.css" /> </head> <body> <div> <div style="float: left;"> <form onsubmit="onSubmitSearchLocation(this.address.value); return false" > <input size="100" type="text" name="address" id="address" value="" placeholder="Location" title="Search"> <input type="button" onclick="onSubmitSearchLocation(document.getElementById('address').value)" value="Search"/> </form> <div id="map"></div> </div> <div id="mapinfoDiv" style="float: right;width: 410px;"> Map Info <button onclick="clearDivContent()">Clear Content</button> <hr> <div id="mapinfo"></div> </div> </div> <script type="text/javascript"> initialize(37.4419, -122.1419); currentLocationView(); function clearDivContent(){ document.getElementById("mapinfo").innerHTML = ''; } </script> </body> </html>
var map; var infowindow; var markersArray = []; var tempPlace ; function initialize(selectedLat,selectedLong) { var pyrmont = new google.maps.LatLng(selectedLat,selectedLong); map = new google.maps.Map(document.getElementById('map'), { mapTypeId: google.maps.MapTypeId.ROADMAP, center: pyrmont, zoom: 10, streetViewControl: false }); var searchedAddress = document.getElementById('address'); var autocomplete = new google.maps.places.Autocomplete(searchedAddress); autocomplete.bindTo('bounds', map); google.maps.event.addListener(autocomplete, 'place_changed', function() { var place = autocomplete.getPlace(); onSearchCLicked(place.geometry.location,searchedAddress.value); tempPlace = autocomplete.getPlace(); }); google.maps.event.addListener(map, 'zoom_changed', function() { console.log("zoom_changed: " + map.getZoom()); document.getElementById("mapinfo").innerHTML = "Zoom Level: " + map.getZoom(); getDistance(); findDistance(); }); } function onSearchCLicked(locationSearched,searchedAddress) { map.setCenter(locationSearched); map.setZoom(12); locationSearched = locationSearched.toString().replace("(",""); locationSearched = locationSearched.toString().replace(")",""); var latlng = locationSearched.toString().split(",") ; var pyrmont = new google.maps.LatLng(latlng[0],latlng[1]); var request = { location: pyrmont, radius: 500000, name: searchedAddress }; infowindow = new google.maps.InfoWindow(); var service = new google.maps.places.PlacesService(map); service.search(request, callback); } function callback(results, status) { if(results.length > 0){ clearOverlays(); } if (status == google.maps.places.PlacesServiceStatus.OK) { //clearOverlays(); for (var i = 0; i < results.length; i++) { createMarker(results[i]); } }else { if(tempPlace != '' && tempPlace != undefined) { clearOverlays(); createMarker(tempPlace); } } } function clearOverlays() { if (markersArray) { for (i in markersArray) { markersArray[i].setMap(null); } } markersArray.length = 0; } function closeInfoWindows() { if (markersArray) { for (i in markersArray) { markersArray[i].infowindow.close(); } } } function createMarker(place) { var searchedAddress = document.getElementById("address").value; var placeLoc = place.geometry.location; /* For Marker Image change http://powerhut.co.uk/googlemaps/custom_markers.php/ */ var image = new google.maps.MarkerImage( 'map_marker.png', new google.maps.Size(23,53), new google.maps.Point(0,0), new google.maps.Point(12,53) ); var marker = new google.maps.Marker({ map: map, draggable: true, icon:image, position: place.geometry.location }); markersArray.push(marker); google.maps.event.addListener(marker, "dragend", function(event) { placeLoc = this.getPosition(); var locationSearched = placeLoc.toString().replace("(",""); locationSearched = locationSearched.toString().replace(")",""); var latlng = locationSearched.toString().split(",") ; var geocoder = new google.maps.Geocoder(); geocoder.geocode({ latLng: this.getPosition() }, function(responses){ if (responses && responses.length > 0){ var redirectURL; document.getElementById("address").value=responses[0].formatted_address; searchedAddress = '' ; infowindow.setContent("Address:"); infowindow.open(map, marker); } else { alert('Cannot determine address at this location.'); } }); }); google.maps.event.addListener(marker, 'click', function() { placeLoc = this.getPosition(); var locationSearched = placeLoc.toString().replace("(",""); locationSearched = locationSearched.toString().replace(")",""); var latlng = locationSearched.toString().split(",") ; var geocoder = new google.maps.Geocoder(); geocoder.geocode({ latLng: this.getPosition() }, function(responses){ if (responses && responses.length > 0){ var redirectURL; document.getElementById("address").value=responses[0].formatted_address; infowindow.setContent("
" + responses[0].formatted_address + "Address:"); infowindow.open(map, marker); } else { alert('Cannot determine address at this location.'); } }); }); } function currentLocationView() { // Try HTML5 geolocation for redirecting to current location if(navigator.geolocation) { navigator.geolocation.getCurrentPosition(function(position) { var pos = new google.maps.LatLng(position.coords.latitude, position.coords.longitude); map.setCenter(pos); map.setZoom(12); var latlng = []; latlng.push(position.coords.latitude); latlng.push(position.coords.longitude); }, function() { handleNoGeolocation(true); }); } else { // Browser doesn't support Geolocation handleNoGeolocation(false); } } function getDistance(){ bounds = map.getBounds(); if(bounds == undefined) return 0.18207856772 ; center = bounds.getCenter(); ne = bounds.getNorthEast(); // r = radius of the earth in statute miles var r = 3963.0; // Convert lat or lng from decimal degrees into radians (divide by 57.2958) var lat1 = center.lat() / 57.2958; var lon1 = center.lng() / 57.2958; var lat2 = ne.lat() / 57.2958; var lon2 = ne.lng() / 57.2958; // distance = circle radius from center to Northeast corner of bounds var dis = r * Math.acos(Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1)); document.getElementById("mapinfo").innerHTML = document.getElementById("mapinfo").innerHTML + "
" + responses[0].formatted_address + "
Radius:- Miles: " + (dis) + " KM: " + (dis*1.60934); return dis; } var Rm = 3961; // mean radius of the earth (miles) at 39 degrees from the equator var Rk = 6373; // mean radius of the earth (km) at 39 degrees from the equator /* main function */ function findDistance() { var t1, n1, t2, n2, lat1, lon1, lat2, lon2, dlat, dlon, a, c, dm, dk, mi, km; bounds = map.getBounds(); if(bounds == undefined) return 0.18207856772 ; center = bounds.getCenter(); ne = bounds.getNorthEast(); sw = bounds.getSouthWest(); // get values for lat1, lon1, lat2, and lon2 t1 = ne.lat(); n1 = ne.lng(); t2 = sw.lat(); n2 = sw.lng(); // convert coordinates to radians lat1 = deg2rad(t1); lon1 = deg2rad(n1); lat2 = deg2rad(t2); lon2 = deg2rad(n2); // find the differences between the coordinates dlat = lat2 - lat1; dlon = lon2 - lon1; // here's the heavy lifting a = Math.pow(Math.sin(dlat/2),2) + Math.cos(lat1) * Math.cos(lat2) * Math.pow(Math.sin(dlon/2),2); c = 2 * Math.atan2(Math.sqrt(a),Math.sqrt(1-a)); // great circle distance in radians dm = c * Rm; // great circle distance in miles dk = c * Rk; // great circle distance in km // round the results down to the nearest 1/1000 mi = round(dm); km = round(dk); // display the result document.getElementById("mapinfo").innerHTML = document.getElementById("mapinfo").innerHTML + "
Distance between North East Lat-Lng and South West Lat-Lng:- KM2: " + km + " Miles2: " + mi ; document.getElementById("mapinfo").innerHTML = document.getElementById("mapinfo").innerHTML + " Lat 1: " + ne.lat() + " Lng 1: " + ne.lng() ; document.getElementById("mapinfo").innerHTML = document.getElementById("mapinfo").innerHTML + " Lat 2: " + sw.lat() + " Lng 2: " + sw.lng() ; } // convert degrees to radians function deg2rad(deg) { rad = deg * Math.PI/180; // radians = degrees * pi/180 return rad; } // round to the nearest 1/1000 function round(x) { return Math.round( x * 1000) / 1000; }
#map { height: 600px; width: 1150px; border: 1px solid #333; margin-top: 0.6em; } .pac-container { color: black; width: 370px !important; }
map_marker.png
Output
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