Asp.net web application with Google Map results

Question

Hi Friends,

I have one doubt regarding one application, Pls help.

I want to get the Names of Candidates from the database who is residing 5kms from the radius of the area which I enter into the search box.

I will enter AREA name in search box, It should return names of the candidates who are residing in 5kms radius of the entered area.

How Can I do it. Pls help. Shall I integrate google maps. Pls guide me step by step.

Thanks in Advance.

Regards,

Karim

Answer 1

Hi @Karimullah21 ,
I think you can do this:
1.To implement Google Maps, you need to add the following link in the Head section.

<sc ript type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false"></s cript>  

2.Get the coordinates of the area in the input box

var geocoder = new google.maps.Geocoder();  
var con = document.getElementById('txtCon').value;  
var city = document.getElementById('txtCity').value;  
var res = document.getElementById('lblresult');  
var com = city + "," + con;  
geocoder.geocode({ 'address': com }, function (results, status) {  
                  if (status == google.maps.GeocoderStatus.OK) {  
                      res.innerHTML = "Latitude : " + results[0].geometry.location.lat() + "<br/>Longitude :" +  
                          results[0].geometry.location.lng();  
                  } else {  
                      res.innerHTML = "Wrong Details: " + status;  
                  }  

3.Obtain the coordinates of the candidate's place of residence in the database
4.Calculate the distance between two coordinates and return the name if it is greater than 5 kilometers
var center = new google.maps.LatLng(3.2987599, 102.6872022);
var latLng = new google.maps.LatLng(3.0987599, 101.6872022);
var distanceInMetres = google.maps.geometry.spherical.computeDistanceBetween(center, latLng);
Distance between 2 points: (lat1,lon1) to (lat2,lon2)

distance = acos(  
     cos(lat1 * (PI()/180)) *  
     cos(lon1 * (PI()/180)) *  
     cos(lat2 * (PI()/180)) *  
     cos(lon2 * (PI()/180))  
     +  
     cos(lat1 * (PI()/180)) *  
     sin(lon1 * (PI()/180)) *  
     cos(lat2 * (PI()/180)) *  
     sin(lon2 * (PI()/180))  
     +  
     sin(lat1 * (PI()/180)) *  
     sin(lat2 * (PI()/180))  
    ) * 3959  

3959 is the Earth radius in Miles. Replace this value with radius in KM, (or any other unit), to get results on the same unit.

Best regards,
Lan Huang

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