Algorithm.js

var geocoder;
var map;
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var latit = 28.539923;
var longit = 77.34398759999999;
var direclat;
var direclong;

function initialize() {

  var input = document.getElementById('NameSearch');
  var searchBox = new google.maps.places.SearchBox(input);
  directionsDisplay = new google.maps.DirectionsRenderer({suppressMarkers: true});

  directionsDisplay.setMap(map);
  google.maps.event.addDomListener(document.getElementById('directions'), 'click', calcRoute);

  map.addListener('bounds_changed', function() {
	searchBox.setBounds(map.getBounds());
  });
}

google.maps.event.addDomListener(window, "load", initialize);

codeAddress = function () {
  initialize();
  var address = document.getElementById('NameSearch').value;
  if(address === '' )
	address = 'New Delhi, Delhi, India';

  geocoder = new google.maps.Geocoder();

  geocoder.geocode( { 'address': address}, function(results, status) {

	if (status == google.maps.GeocoderStatus.OK) {
	  var georesult = results[0].geometry.location;
	  map.setCenter(georesult);

	  marker = new google.maps.Marker({
		map: map,
		position: georesult,
		draggable: true,
		animation:google.maps.Animation.DROP,
		icon: 'img/location-marker.png'
	  });

	  updateMarkerPosition(georesult);
	  updateaddycode(georesult);
	  geocodePosition(georesult);

	  google.maps.event.addListener(marker, 'dragstart', function() {
		updateMarkerAddress('Finding');
	  });
	  google.maps.event.addListener(marker, 'drag', function() {
		updateMarkerPosition(marker.getPosition());
		updateaddycode(marker.getPosition());
	  });
	  google.maps.event.addListener(marker, 'dragend', function() {
		geocodePosition(marker.getPosition());
	  });
	  google.maps.event.addListener(map, 'click', function(e) {
		updateMarkerPosition(e.latLng);
		updateaddycode(e.latLng);
		geocodePosition(marker.getPosition());
		marker.setPosition(e.latLng);
		map.panTo(marker.getPosition());
	  });
	  marker.addListener('click', toggleBounce);
	}

	else {
	  alert('Error: ' + status);
	}

  });
}

codebackconvert = function(d) {
  return parseInt(d, 36);
}

codeconvert = function(d) {
  return (+d).toString(36).toUpperCase();
}

function updateMarkerAddress(str) {
  document.getElementById('address').innerHTML = str;
}

function updateMarkerPosition(latLng) {
  document.getElementById('info').innerHTML = [
	latLng.lat(),
	latLng.lng()
  ].join(', ');
  direclat = latLng.lat();
  direclong = latLng.lng();
}

function toggleBounce() {
  if (marker.getAnimation() !== null) {
	marker.setAnimation(null);
  }
  else {
	marker.setAnimation(google.maps.Animation.BOUNCE);
  }
}

function updateaddycode(latLng) {
  var latitude = latLng.lat();
  var longitude = latLng.lng();
  var lati = Math.round(latitude*10000)-74000;
  var long = Math.round(longitude*10000)-675000;
  if(lati<=0 || long<=0 || lati>=300000 || long>=300000) {
	document.getElementById('addycode').innerHTML = 'Region Not Supported';
  }
  else {
	var latcode = codeconvert(lati);
	var longcode = codeconvert(long);
	document.getElementById('addycode').innerHTML = [latcode,longcode].join('');
  }
}

function geocodePosition(pos) {
  geocoder.geocode({
	latLng: pos
  },
  function(responses) {
	if (responses && responses.length > 0) {
	  updateMarkerAddress(responses[0].formatted_address);
	}
	else {
	  updateMarkerAddress('Cannot determine address at this location.');
	}
  });
}

codeback = function() {
  var backcode = document.getElementById('BackCode').value;
  var backcode1 = backcode.substring(0,4);
  var backcode2 = backcode.substring(4,8);
  document.getElementById('NameSearch').value = [(codebackconvert(backcode1)+74000)/10000,(codebackconvert(backcode2)+675000)/10000].join(', ');
  codeAddress();
}

function getLocation() {
	if (navigator.geolocation) {
		navigator.geolocation.getCurrentPosition(showPosition);
	} else {
		alert("Geolocation is not supported by this browser.");
	}
}

function showPosition(position) {
  var lat = position.coords.latitude;
  var long = position.coords.longitude;
  document.getElementById('NameSearch').value = [lat,long].join(', ');
  codeAddress();
}

function getPosition(position) {
  latit = position.coords.latitude;
  longit = position.coords.longitude;
}

function calcRoute() {

  var end = new google.maps.LatLng(direclat, direclong);
  navigator.geolocation.getCurrentPosition(getPosition);
  var start = new google.maps.LatLng(latit, longit);
  //var end = new google.maps.LatLng(38.334818, -181.884886);
  var request = {
	origin: start,
	destination: end,
	travelMode: google.maps.TravelMode.DRIVING
  };
  directionsService.route(request, function(response, status) {
	if (status == google.maps.DirectionsStatus.OK) {
	  directionsDisplay.setDirections(response);
	  directionsDisplay.setMap(map);
	}
	else {
	  alert("Directions Request from " + start.toUrlValue(6) + " to " + end.toUrlValue(6) + " failed: " + status);
	}
  });
}