display directions - html

Question

I am using JavaScript in HTML page to display GPS locations with markers and all these GPS locations are connected
I am trying to implement a map/direction based application using Google maps V3 API. So far I have been able to display the map and show directions for two locations selected. the first one is my current location , the second one is the location of costumer (his/her information exist in my database). All the markers are being displayed in the output properly.

Answer 1

To get directions to a location specified by coordinates, make it a google.maps.LatLng object. To get that from your data in the select, save the coordinates as a string in the value, then parse out the latitude and longitude to create the LatLng object.
save the coordinates in the option value:
for (var i = 0; i < data.length; i++) {
displayLocation(data[i]);
addOption(selectBox, data[i]['CodeClient'], data[i].Latitude + "," + data[i].Longitude);
}
parse those coordinates and create a google.maps.LatLng object in the directions request:
function calculateRoute() {
var start = document.getElementById('start').value;
var destination = document.getElementById('destination').value;
console.log("selected option value=" + destination);
var destPt = destination.split(",");
var destination = new google.maps.LatLng(destPt[0], destPt[1]);
if (start == '') {
start = center;
}
// ....
proof of concept fiddle
code snippet:
var map;
var directionsService;
var directionsDisplay;
var geocoder;
var infowindow;
function init() {
directionsService = new google.maps.DirectionsService();
directionsDisplay = new google.maps.DirectionsRenderer();
geocoder = new google.maps.Geocoder();
infowindow = new google.maps.InfoWindow();
var mapOptions = {
zoom: 6,
center: center = new google.maps.LatLng(32, -6),
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
directionsDisplay.setMap(map);
directionsDisplay.setPanel(document.getElementById('directions_panel'));
// Detect user location
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var userLocation = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
geocoder.geocode({
'latLng': userLocation
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
document.getElementById('start').value = results[0].formatted_address
}
});
}, function() {
alert('Geolocation is supported, but it failed');
});
}
makeRequest('https://gist.githubusercontent.com/abdelhakimsalama/358669eda44d8d221bf58c629402c40b/raw/eca59a21899fe19b1f556ff033a33dff2a6bdd0c/get_data_google_api', function(data) {
var data = JSON.parse(data.responseText);
var selectBox = document.getElementById('destination');
for (var i = 0; i < data.length; i++) {
displayLocation(data[i]);
addOption(selectBox, data[i]['CodeClient'], data[i].Latitude + "," + data[i].Longitude);
}
});
}
function addOption(selectBox, text, value) {
var option = document.createElement("OPTION");
option.text = text;
option.value = value;
selectBox.options.add(option);
}
function calculateRoute() {
var start = document.getElementById('start').value;
var destination = document.getElementById('destination').value;
console.log("selected option value=" + destination);
var destPt = destination.split(",");
var destination = new google.maps.LatLng(destPt[0], destPt[1]);
if (start == '') {
start = center;
}
var request = {
origin: start,
destination: destination,
travelMode: google.maps.DirectionsTravelMode.DRIVING
};
console.log("origin:" + start);
console.log("dest:" + destination.toUrlValue(12));
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
function makeRequest(url, callback) {
var request;
if (window.XMLHttpRequest) {
request = new XMLHttpRequest(); // IE7+, Firefox, Chrome, Opera, Safari
} else {
request = new ActiveXObject("Microsoft.XMLHTTP"); // IE6, IE5
}
request.onreadystatechange = function() {
if (request.readyState == 4 && request.status == 200) {
callback(request);
}
}
request.open("GET", url, true);
request.send();
}
function displayLocation(rythmstu_innotec) {
var content = '<div class="infoWindow"><strong> Code Client : ' + rythmstu_innotec.CodeClient + '</strong>' +
'<br />Latitude : ' + rythmstu_innotec.Latitude +
'<br />Longitude : ' + rythmstu_innotec.Longitude +
'<br />Route : ' + rythmstu_innotec.Route +
'<br />Secteur : ' + rythmstu_innotec.Secteur +
'<br />Agence : ' + rythmstu_innotec.Agence +
'<br />prenom de Client : ' + rythmstu_innotec.PrenomClient +
'<br />Num Adresse : ' + rythmstu_innotec.NumAdresse +
'<br />GeoAdresse : ' + rythmstu_innotec.GeoAdresse +
'<br />Téléphone : ' + rythmstu_innotec.Tel +
'<br />Whatsapp : ' + rythmstu_innotec.Whatsapp +
'<br />Nbr Frigos : ' + rythmstu_innotec.NbrFrigo +
'<br />Ouverture Matin : ' + rythmstu_innotec.OpenAm +
'<br />Fermeture Matin : ' + rythmstu_innotec.CloseAm +
'<br />Ouverture après-midi : ' + rythmstu_innotec.OpenPm +
'<br />Fermeture Après-midi : ' + rythmstu_innotec.ClosePm + '</div>';
if (parseInt(rythmstu_innotec.Latitude) == 0) {
geocoder.geocode({
'GeoAdresse': rythmstu_innotec.GeoAdresse
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.rythmstu_innotec,
title: rythmstu_innotec.name
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(content);
infowindow.open(map, marker);
});
}
});
} else {
var position = new google.maps.LatLng(parseFloat(rythmstu_innotec.Latitude), parseFloat(rythmstu_innotec.Longitude));
var marker = new google.maps.Marker({
map: map,
position: position,
title: rythmstu_innotec.name
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.setContent(content);
infowindow.open(map, marker);
});
}
}
body {
font: normal 14px Verdana;
}
h1 {
font-size: 24px;
}
h2 {
font-size: 18px;
}
#sidebar {
float: right;
width: 30%;
}
#main {
padding-right: 15px;
}
.infoWindow {
width: 220px;
}
<title>MAP itinéraire </title>
<meta charset="utf-8">
<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js"></script>
<body onload="init();">
<form id="services">
Location: <input type="text" id="start" value="Midar" /> Destination:
<select id="destination" onchange="calculateRoute();"></select>
<input type="button" value="afficher la direction" onclick="calculateRoute();" />
</form>
<section id="sidebar">
<div id="directions_panel"></div>
</section>
<section id="main">
<div id="map_canvas" style="width: 70%; height: 750px;"></div>
</section>
</body>