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Hi,

I am trying to create an application which utilizes the distance finder. I want to be able to calculate the distance between two points. I have managed to (with the aid of a lot of tutorials) be able to calculate the distances between two points.

Now, in the application, there will be times where the user does not supply us with their location to calculate the distance. In this situation, the Latitude and Longitude will be calculated and this location will be shown to the user in the address form instead of with Latitude and Longitude.

What I have on one page is the distance calculator:

<html>
<head>
<title>Distance finder</title>
<meta type="description" content="Find the distance between two places on the map and the shortest route."/>

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

	var location1;
	var location2;
	
	var address1;
	var address2;

	var latlng;
	var geocoder;
	var map;
	
	var distance;
	
	// finds the coordinates for the two locations and calls the showMap() function
	function initialize()
	{
		geocoder = new google.maps.Geocoder(); // creating a new geocode object
		
		// getting the two address values
		address1 = document.getElementById("address1").value;
		address2 = document.getElementById("address2").value;
		
		// finding out the coordinates
		if (geocoder) 
		{
			geocoder.geocode( { 'address': address1}, function(results, status) 
			{
				if (status == google.maps.GeocoderStatus.OK) 
				{
					//location of first address (latitude + longitude)
					location1 = results[0].geometry.location;
				} else 
				{
					alert("Geocode was not successful for the following reason: " + status);
				}
			});
			geocoder.geocode( { 'address': address2}, function(results, status) 
			{
				if (status == google.maps.GeocoderStatus.OK) 
				{
					//location of second address (latitude + longitude)
					location2 = results[0].geometry.location;
					// calling the showMap() function to create and show the map 
					showMap();
				} else 
				{
					alert("Geocode was not successful for the following reason: " + status);
				}
			});
		}
	}
		
	// creates and shows the map
	function showMap()
	{
		// center of the map (compute the mean value between the two locations)
		latlng = new google.maps.LatLng((location1.lat()+location2.lat())/2,(location1.lng()+location2.lng())/2);
		
		// set map options
			// set zoom level
			// set center
			// map type
		var mapOptions = 
		{
			zoom: 1,
			center: latlng,
			mapTypeId: google.maps.MapTypeId.HYBRID
		};
		
		// create a new map object
			// set the div id where it will be shown
			// set the map options
		map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
		
		// show route between the points
		directionsService = new google.maps.DirectionsService();
		directionsDisplay = new google.maps.DirectionsRenderer(
		{
			suppressMarkers: true,
			suppressInfoWindows: true
		});
		directionsDisplay.setMap(map);
		var request = {
			origin:location1, 
			destination:location2,
			travelMode: google.maps.DirectionsTravelMode.DRIVING
		};
		directionsService.route(request, function(response, status) 
		{
			if (status == google.maps.DirectionsStatus.OK) 
			{
				directionsDisplay.setDirections(response);
				distance = "The distance between the two points on the chosen route is: "+response.routes[0].legs[0].distance.text;
				distance += "<br/>The aproximative driving time is: "+response.routes[0].legs[0].duration.text;
				document.getElementById("distance_road").innerHTML = distance;
			}
		});
		
		// show a line between the two points
		var line = new google.maps.Polyline({
			map: map, 
			path: [location1, location2],
			strokeWeight: 7,
			strokeOpacity: 0.8,
			strokeColor: "#FFAA00"
		});
		
		// create the markers for the two locations		
		var marker1 = new google.maps.Marker({
			map: map, 
			position: location1,
			title: "First location"
		});
		var marker2 = new google.maps.Marker({
			map: map, 
			position: location2,
			title: "Second location"
		});
		
		// create the text to be shown in the infowindows
		var text1 = '<div id="content">'+
				'<h1 id="firstHeading">First location</h1>'+
				'<div id="bodyContent">'+
				'<p>Coordinates: '+location1+'</p>'+
				'<p>Address: '+address1+'</p>'+
				'</div>'+
				'</div>';
				
		var text2 = '<div id="content">'+
			'<h1 id="firstHeading">Second location</h1>'+
			'<div id="bodyContent">'+
			'<p>Coordinates: '+location2+'</p>'+
			'<p>Address: '+address2+'</p>'+
			'</div>'+
			'</div>';
		
		// create info boxes for the two markers
		var infowindow1 = new google.maps.InfoWindow({
			content: text1
		});
		var infowindow2 = new google.maps.InfoWindow({
			content: text2
		});

		// add action events so the info windows will be shown when the marker is clicked
		google.maps.event.addListener(marker1, 'click', function() {
			infowindow1.open(map,marker1);
		});
		google.maps.event.addListener(marker2, 'click', function() {
			infowindow2.open(map,marker1);
		});
		
		// compute distance between the two points
		var R = 6371; 
		var dLat = toRad(location2.lat()-location1.lat());
		var dLon = toRad(location2.lng()-location1.lng()); 
		
		var dLat1 = toRad(location1.lat());
		var dLat2 = toRad(location2.lat());
		
		var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
				Math.cos(dLat1) * Math.cos(dLat1) * 
				Math.sin(dLon/2) * Math.sin(dLon/2); 
		var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
		var d = R * c;
		
		document.getElementById("distance_direct").innerHTML = "<br/>The distance between the two points (in a straight line) is: "+d;
	}
	
	function toRad(deg) 
	{
		return deg * Math.PI/180;
	}
</script>

</head>

<body bgcolor="#eeeeee">
	<div id="form" style="width:100%; height:20%">
		<table align="center" valign="center">
			<tr>
				<td colspan="7" align="center"><b>Find the distance between two locations</b></td>
			</tr>
			<tr>
				<td colspan="7">&nbsp;</td>
			</tr>
			<tr>
				<td>First address:</td>
				<td>&nbsp;</td>
				<td><input type="text" name="address1" id="address1" size="50"/></td>
				<td>&nbsp;</td>
				<td>Second address:</td>
				<td>&nbsp;</td>
				<td><input type="text" name="address2" id="address2" size="50"/></td>
			</tr>
			<tr>
				<td colspan="7">&nbsp;</td>
			</tr>
			<tr>
				<td colspan="7" align="center"><input type="button" value="Show" onClick="initialize();"/></td>
			</tr>
		</table>
	</div>
	<center><div style="width:100%; height:10%" id="distance_direct"></div></center>
	<center><div style="width:100%; height:10%" id="distance_road"></div></center>
	
	<center><div id="map_canvas" style="width:70%; height:54%"></div></center>
</body>
</html>

And on my other page I've got the latitude and longitude calculator.

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

if (navigator.geolocation) { 
  navigator.geolocation.getCurrentPosition(function(position) {  

    var point = new google.maps.LatLng(position.coords.latitude, 
                                       position.coords.longitude);

    // Initialize the Google Maps API v3
    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 15,
      center: point,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    });

    // Place a marker
    new google.maps.Marker({
      position: point,
      map: map
    });
  }); 
} 
else {
  alert('W3C Geolocation API is not available');
}

</script>

<div id="map" style="width: 500px; height: 400px;"></div>

Any help would greatly be appreciated. I'm also stuck because these two pages will act as functions and will be linked to the main page where the input and output will occur. I'm new to JavaScript, but I am willing to do a lot to get this to work.

Thanks.

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Last Post by Ravi_10
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