Google Maps script: Live step by step directions

I’v just seen a very cool application of Google Maps integrated with Javascript in an HTML page. The code has been developed by a guy named Shreerang Patwardhan (don’t ask me to pronounce :P) and can be found on this blog:

I’m copying the code here, in case the blog in no longer accessible. Just copy the following code in an HTML file.

<meta http-equiv=”content-type” content=”text/html; charset=UTF-8″/>
Drive Along

<script src=”;v=2&amp;sensor=false&amp;key=ABQIAAAAu3HXU_hLdVPTFGqLed_FCxT2yXp_ZAY8_ufC3CFXhHIE1NvwkxQbblEPYBGNoRsuuSU9aBfSq4VAZA&#8221; type=”text/javascript”>

<script src=”; type=”text/javascript”>


<body onunload=”GUnload()”>

<div id=”controls”>
<form onsubmit=”start();return false” action=”#”>
Enter start and end addresses.<br />
<input type=”text” size=”80″ maxlength=”200″ id=”startpoint” value=” ” />
<br />
<input type=”text” size=”80″ maxlength=”200″ id=”endpoint” value=” ” />
<br />
<input type=”submit” value=”Start”  />

<div id=”map” style=”width: 700px; height: 500px”>
<div id=”step”>&nbsp;
<div id=”distance”>Miles: 0.00

<script type=”text/javascript”>
if (GBrowserIsCompatible())
var map = new GMap2(document.getElementById(“map”));
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(0,0),2);
var dirn = new GDirections();
var step = 5; // metres
var tick = 100; // milliseconds
var poly;
var eol;
var car = new GIcon();
car.iconSize=new GSize(28,28);
car.iconAnchor=new GPoint(16,9);
var marker;
var k=0;
var stepnum=0;
var speed = “”;

function animate(d)
if (d>eol)
document.getElementById(“step”).innerHTML = “<b>Trip completed<\/b>”;
document.getElementById(“distance”).innerHTML =  “Miles: “+(d/1609.344).toFixed(2);
var p = poly.GetPointAtDistance(d);
if (k++>=180/step)
document.getElementById(“distance”).innerHTML =  “Miles: “+(d/1609.344).toFixed(2)+speed;
if (stepnum+1 < dirn.getRoute(0).getNumSteps())
if (dirn.getRoute(0).getStep(stepnum).getPolylineIndex() < poly.GetIndexAtDistance(d))
var steptext = dirn.getRoute(0).getStep(stepnum).getDescriptionHtml();
document.getElementById(“step”).innerHTML = “<b>Next:<\/b> “+steptext;
var stepdist = dirn.getRoute(0).getStep(stepnum-1).getDistance().meters;
var steptime = dirn.getRoute(0).getStep(stepnum-1).getDuration().seconds;
var stepspeed = ((stepdist/steptime) * 2.24).toFixed(0);
step = stepspeed/2.5;
speed = “<br>Current speed: ” + stepspeed +” mph”;
if (dirn.getRoute(0).getStep(stepnum).getPolylineIndex() < poly.GetIndexAtDistance(d))
document.getElementById(“step”).innerHTML = “<b>Next: Arrive at your destination<\/b>”;
setTimeout(“animate(“+(d+step)+”)”, tick);

GEvent.addListener(dirn,”load”, function()
map.addOverlay(new GMarker(poly.getVertex(0),G_START_ICON));
map.addOverlay(new GMarker(poly.getVertex(poly.getVertexCount()-1),G_END_ICON));
marker = new GMarker(poly.getVertex(0),{icon:car});
var steptext = dirn.getRoute(0).getStep(stepnum).getDescriptionHtml();
document.getElementById(“step”).innerHTML = steptext;
setTimeout(“animate(0)”,2000);  // Allow time for the initial map display

GEvent.addListener(dirn,”error”, function()
alert(“Location(s) not recognised. Code: “+dirn.getStatus().code);

function start()
var startpoint = document.getElementById(“startpoint”).value;
var endpoint = document.getElementById(“endpoint”).value;


About Olivier Voyer
Auteur-compositeur-interprète. La tête toujours pleine de musique et d'idées. Comblé par l'amour de Jésus.

2 Responses to Google Maps script: Live step by step directions

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