Reference Error: google is not defined

Hi All,
I am trying to execute javascript through Qt script.
My javascript contains code for google maps API.
when i ran it through Qt script, it gives an Error like "Reference
Error: google is not defined".

I think the problem is the

Code:

<script type="text/javascript" src="http://maps.google.com/maps/api/js?
sensor=false">
</script>

line from the html file. If I use the <> brackets, the java script
engine won't compile it, and if I omit the line, the program gets the
"google not found" error...

Please anyone help me how to call the URL inside <script> tag in
javascript which is been executed by Qt script?

NOTE:
Here, I have included JS and Qt script file.
JS file:

Code:

function calcRoute() {
 var directionsService = new google.maps.DirectionsService(); //
getting error here."google not defined"
 var start = "chennai";
 var end = "bangalore";
 var request = {
   origin:start,
   destination:end,
   travelMode: google.maps.DirectionsTravelMode.DRIVING
 };
 directionsService.route(request, function(resp, status) {
   if (status == google.maps.DirectionsStatus.OK) {
       return resp;
   }
 
 });
}

QtScript file:

Code:

#include <QApplication>
#include <QtScript>
#include <QScriptEngine>
 
int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  QScriptEngine engine;
  QScriptValue global = engine.globalObject();
 
  QString fileName1 = "direction.js";
  QFile scriptFile1(fileName1);
  if(!scriptFile1.open(QIODevice::ReadOnly))
  {
     qDebug() << "error";
  }
  QTextStream stream1(&scriptFile1);
  QString contents1 = stream1.readAll();
  scriptFile1.close();
  QScriptValue result1 = engine.evaluate(contents1, fileName1);
  if(engine.hasUncaughtException()) {
      int line = engine.uncaughtExceptionLineNumber();
      qDebug() << "uncaught exception at line" << line << ":" <<
result1.toString();
  }
  QScriptValue val1 = global.property("calcRoute");
  QScriptValueList args1;
  QScriptValue final_res1 = val1.call(QScriptValue(), args1);  //
calling JS function calcRoute with no args
  qDebug() << "The result is: " << final_res1.toString();
  return app.exec();
}