js: Uncaught ReferenceError: google is not defined false

EdXian · wrote on 28 Oct 2017, 12:40

Hi,all
I want to integrate Google Maps APIs with Qt 5.7 . I used QWebengineview to load Google Map url and so it works fine . However , when using webview->page()->runjavascript() to manipulate javascript function , I finally got error js: Uncaught ReferenceError: google is not defined false . I cant figure out how to resolve this problem. any idea?
See my myproject here.

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

       QUrl url("qrc:/map.html");

       QWebEngineSettings::globalSettings()->setAttribute(QWebEngineSettings::PluginsEnabled,true);
       QWebEngineSettings::globalSettings()->setAttribute(QWebEngineSettings::JavascriptEnabled,true);
       QWebEnginePage *page = new QWebEnginePage(this);
       QWebChannel *channel = new QWebChannel(this);
       page->load(url);
       page->setWebChannel(channel);
       ui->widget->setPage(page);

        QString js=QString("var marker = new google.maps.Marker({ ")+
        QString("position: new google.maps.LatLng(24.705311, -74.2581939),")+
        QString(" map: map,")+
        QString("title: \"Marker A\",")+
        QString("   }); ");

       ui->widget->page()->runJavaScript(js,[](const QVariant &result){ qDebug() << result.toBool(); });


}

MainWindow::~MainWindow()
{
    delete ui;
}

map.html

<!DOCTYPE html>
<html>
  <head>
    <style>
       #map {
        height: 400px;
        width: 100%;
       }
    </style>
  </head>
  <body>
    <h3>My Google Maps Demo</h3>
    <div id="map"></div>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=AIzaSyA_iIaYqH8KQkC4rVm2IRLAqHiBawE0_Ag&callback=initMap">
    </script>
    <script>
      function initMap() {
        var uluru = {lat: -25.363, lng: 131.044};
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 4,
          center: uluru
        });
        var marker = new google.maps.Marker({
          position: uluru,
          map: map
        });
      }
    </script>
  </body>
</html>