For
displaying directions with route details first we need latitude and longitude
of two locations.
To
know how to get Latitude and Longitude of any place in Google maps? Please
Visit here
Location
1 is act as source point and location 2 is destination point.
I
am considering
·
Source Location -
28.67854, 77.23938 - Red Fort, New Delhi, India
·
Destiation Location -
27.175114, 78.042154 – Taj Mahal, Agra
UI Design:-
Here
is a screenshot of Google map from Red Fort to Tajmahal
We
need to develop similar webpage with same details in ASP.NET
How
to do this in ASP.NET using C#?
Google
team already developed API for map and its functionality. These API works with
JQuery or Javascript.
C# Code
·
Create Location Entity
class to store Latitude and Longitude
public class LocationInfo
{
public string Latitude { get;
set; }
public string Longitude { get;
set; }
}
·
Create one Helper class
for creating JSON string and registering Javascript.
Include namespcase “using
System.Web.Script.Serialization;” in your code for accessing “JavaScriptSerializer” class
public static
class Helper
{
/// <summary>
/// Generates Json for
specific object instance
/// </summary>
/// <param name="instance">Instance to be converted to Json </param>
/// <param name="recursionDepth">Recursion depth optional paramter</param>
/// <returns>Json for
specific object instance</returns>
public static string ToJson(this object instance, int
recursionDepth) {
JavaScriptSerializer serializer = new JavaScriptSerializer();
serializer.RecursionLimit = recursionDepth;
return serializer.Serialize(instance);
}
/// <summary>
/// Register java script
/// </summary>
/// <param name="script"></param>
/// <param name="control"></param>
public static void BindClientScript(string
script, Control control)
{
ScriptManager.RegisterStartupScript(control, typeof(Page), Guid.NewGuid().ToString(), script, true);
}
}
·
Get source and destination
location details in entity class from database [Leaving database access part]
//Source
Location - Red Fort, New Delhi, India
LocationInfo
sourceLocation = new LocationInfo()
{ Latitude = "28.67854", Longitude
= "77.23938" };
//Destiation
Location - 27.175114, 78.042154 – Taj Mahal, Agra
LocationInfo
destinationLocation = new LocationInfo() { Latitude = "27.175114", Longitude = "78.042154" };
·
Convert this location
entities into its JSON representation as below
string
jsonSourceResponse = Helper.ToJson(sourceLocation,
100);
string
jsonDestinationResponse = Helper.ToJson(destinationLocation,
100);
·
Register javascript
function by passing this Json string as below
string script = "PushLocationData(" + jsonSourceResponse
+ "," + jsonDestinationResponse + ");";
Helper.BindClientScript(script,
this);
ASPX
·
First we need two
javascript file. You don’t need to download these file
Map
functionality - http://maps.google.com/maps/api/js?sensor=false
JQuery
- https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js
·
So its declaration in ASPX
file is as below
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript"
src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
·
Create javascript function
to get the JSON string and hold it in javascript global variable as
source = null;
destination = null;
function
PushLocationData(objsource, objdestination) {
source = objsource;
destination = objdestination;
}
·
Create google maps
direction service object as
directionsService = new google.maps.DirectionsService();
·
Get the latitude and
longitude of source and destination location [Like
X,Y co-ordinates in graph in mathematics]
sourceLatLng = new google.maps.LatLng(source.Latitude,
source.Longitude);
destinationLatLng = new google.maps.LatLng(destination.Latitude,
destination.Longitude);
·
Set different option of
maps like zoom level, alignment of point in map, map type, navigation control
as
var mapOptions
= {
zoom: 15,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
navigationControl: true
};
·
Create map object with all
specified optins and show in DIV as below
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
·
Specify the way you want
directions on google maps as below
directionsRenderer = new google.maps.DirectionsRenderer({
'map':
map,
'draggable':
false,
'hideRouteList':
true,
'suppressMarkers':
true
});
·
Draw route from source to destination
location in driving mode on maps. With
each route we will get directions informations such as route description, distance,
duration etc. as below
directionsService.route({
'origin':
sourceLatLng,
'destination':
destinationLatLng,
'travelMode':
'DRIVING'
},
function(directions,
status) {
for (var i = 0; i < directions.routes.length; i++) {
var
thisRoute = directions.routes[i];
for
(var j = 0; j < thisRoute.legs.length; j++)
{
var
thisLeg = thisRoute.legs[j];
var
useDistance = thisLeg.distance.text;
var
useDuration = thisLeg.duration.text;
var
directionsHTML = '';
for
(var k = 0; k < thisLeg.steps.length; k++) {
var
thisStep = thisLeg.steps[k];
directionsHTML += '<div>' + (k + 1) + '.
' + thisStep.instructions + '<BR/>-------------------'
+ thisStep.distance.text + '</div>';
directionsHTML += '<div></div>';
}
$('#total_distance').html(useDistance);
$('#total_duration').html(useDuration);
$('#direction_steps').append(directionsHTML);
}
}
directionsRenderer.setDirections(directions);
}
);
Here
is complete C# code and ASPX. Just copy and paste below code and bingooooo here
you go
C# Code
public partial class GoogleDirections : System.Web.UI.Page
{
protected
void Page_Load(object
sender, EventArgs e)
{
//Source
Location - Red Fort, New Delhi, India
LocationInfo
sourceLocation = new LocationInfo()
{ Latitude = "28.67854", Longitude
= "77.23938" };
//Destiation
Location - 27.175114, 78.042154 – Taj Mahal, Agra
LocationInfo
destinationLocation = new LocationInfo() { Latitude = "27.175114", Longitude = "78.042154" };
string
jsonSourceResponse = Helper.ToJson(sourceLocation,
100);
string
jsonDestinationResponse = Helper.ToJson(destinationLocation,
100);
string
script = "PushLocationData(" +
jsonSourceResponse + "," +
jsonDestinationResponse + ");";
Helper.BindClientScript(script,
this);
}
}
public class LocationInfo
{
public string Latitude { get;
set; }
public string Longitude { get;
set; }
}
public static class Helper
{
/// <summary>
/// Generates Json for specific object instance
/// </summary>
/// <param
name="instance">Instance to be
converted to Json </param>
/// <param
name="recursionDepth">Recursion
depth optional paramter</param>
/// <returns>Json for specific object instance</returns>
public static string ToJson(this object instance,
int recursionDepth)
{
JavaScriptSerializer
serializer = new JavaScriptSerializer();
serializer.RecursionLimit =
recursionDepth;
return
serializer.Serialize(instance);
}
/// <summary>
/// Register java script
/// </summary>
/// <param
name="script"></param>
/// <param
name="control"></param>
public static void
BindClientScript(string script, Control control)
{
ScriptManager.RegisterStartupScript(control,
typeof(Page),
Guid.NewGuid().ToString(), script, true);
}
}
ASPX
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Google
Directions with route info</title>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
source = null;
destination = null;
function
PushLocationData(objsource, objdestination) {
source = objsource;
destination = objdestination;
}
$(document).ready(function() {
directionsService = new google.maps.DirectionsService();
//Source
Location - Red Fort, New Delhi, India
sourceLatLng = new google.maps.LatLng(source.Latitude,
source.Longitude);
//Destiation
Location - 27.175114, 78.042154 – Taj Mahal, Agra
destinationLatLng = new google.maps.LatLng(destination.Latitude,
destination.Longitude);
//set the
map options
var
mapOptions = {
zoom: 20,
center: destinationLatLng,
mapTypeId:
google.maps.MapTypeId.ROADMAP,
navigationControl: true
};
//create
the map object
map = new
google.maps.Map(document.getElementById("map_canvas"),
mapOptions);
directionsRenderer = new google.maps.DirectionsRenderer({
'map':
map,
'draggable':
false,
'hideRouteList':
true,
'suppressMarkers':
true
});
directionsService.route({
'origin':
sourceLatLng,
'destination':
destinationLatLng,
'travelMode':
'DRIVING'
},
function(directions,
status) {
for
(var i = 0; i < directions.routes.length;
i++) {
var
thisRoute = directions.routes[i];
for
(var j = 0; j < thisRoute.legs.length; j++)
{
var thisLeg = thisRoute.legs[j];
var useDistance = thisLeg.distance.text;
var useDuration = thisLeg.duration.text;
var directionsHTML = '';
for (var k = 0; k <
thisLeg.steps.length; k++) {
var thisStep = thisLeg.steps[k];
directionsHTML += '<div>' + (k + 1) + '.
' + thisStep.instructions + '<BR/>-------------------'
+ thisStep.distance.text + '</div>';
directionsHTML += '<div></div>';
}
$('#total_distance').html(useDistance);
$('#total_duration').html(useDuration);
$('#direction_steps').append(directionsHTML);
}
}
directionsRenderer.setDirections(directions);
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<table style="border: thin solid #000000; font-family: Verdana; font-size: small;"
width="100%">
<tr>
<td valign="top" width="40%">
<div id="direction_steps_holder" style="width: 100%">
<div>
<b>Directions
to TajMahal, Agra (<span
id="total_distance"></span> - about <span
id="total_duration"></span>) </b>
</div>
<div id="direction_steps">
</div>
</div>
</td>
<td valign="top">
<div id="map_canvas" style="width: 750px; height: 700px;">
</div>
</td>
</tr>
</table>
</form>
</body>
</html>
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