Call to Javascript function from Qt doesnt show output

Question

I am trying to call a Javascript function in my HTML file from QT using the addToJavaScriptWindowObject mwthod. I followed this post on StackOverflow and did exactly as the accepted answer.

My code is as follows

main.cpp

#include <QApplication>
#include <QDebug>
#include <QtWebKitWidgets/QWebFrame>
#include <QtWebKitWidgets/QWebPage>
#include <QtWebKitWidgets/QWebView>

class MyJavaScriptOperations : public QObject {
 Q_OBJECT  
 public:
  Q_INVOKABLE void sumOfNumbers(int a, int b) {
      qDebug() << a + b;
  }
 };

 int main(int argc, char *argv[]) 
 {
   QApplication a(argc, argv);
   QWebView *view = new QWebView();
   view->resize(400, 500);
   view->page()->mainFrame()->addToJavaScriptWindowObject("myoperations", new  MyJavaScriptOperations);
   view->load(QUrl("file://C:/programs/index.html"));
   view->show();
   return a.exec();
 }

   #include "main.moc"

.pro file

 QT       += core

 QT       += gui

 QT       += webkit
 QT       += webkit webkitwidgets

 TARGET = QtJsonPostExample
 CONFIG   += console  
 CONFIG   -= app_bundle

 TEMPLATE = app

 SOURCES += main.cpp

 OTHER_FILES += \
 ../../../../programs/index.html

index.html

<html>
 <body>
     <script type="text/javascript">
         myoperations.sumOfNumbers(12, 23);
    </script>
</body>

When I run the above QT project in Qt creator, it compiles correctly and even runs. I see the new window open up but the output , in this case the sum of 12+23= 35 isn't displayed in the Application Output window. Why is that so?

Why am I not able to view the output even though the program is running fine?

Richard Moore · Accepted Answer · 2014-02-01 12:36:27Z

1

It sounds like you forgot to enable debug output. Are you sure you built in debug mode? Try adding a qDebug() << "Test"; to your main function to check.

answered Feb 1, 2014 at 12:36

Richard Moore

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