Get confirmation that a key has reached JS

[Konstantin Tokarev]

@McLion Yes

[McLion]

@Konstantin-Tokarev

OK, fine. What if there is nothing ... on the very same console all qDebug() perfectly appear?

[Konstantin Tokarev]

@McLion No, they go to JS console. You can see it in Inspector, or handle QWebPage::javaScriptConsoleMessage signal

[McLion]

@Konstantin-Tokarev

Ahhh ... OK ... Thanks a lot.
Never saw the 'Inspector' and will try to read it up ... is it also part of webKit in Qt?
I know the inspector on desktop browser but it won't help because it unfortunately does not show the issue there.
I'll try (tomorrow) to connect the signal to a slot and use qDebug() in there.

[McLion]

@McLion
Activated the inspector with the following line:
QWebSettings::globalSettings()->setAttribute(QWebSettings::DeveloperExtrasEnabled, true);
Basically works. However, as soon as I have the inspector turned on my webView's do behave very strange, like they do not get all inputs anymore, and I can not debug the situation.

Looks like I need to implement QWebPage::javaScriptConsoleMessage and send the messages back to C++ and debug from there.
According docs this is not a signal so I can not simply connect to it.

[Konstantin Tokarev]

@McLion Right, I've mixed it up with new consoleMessageReceived() signal that is present in revived QtWebKit only (since TP3)

[McLion]

@Konstantin-Tokarev
Need some help ...
I have the following:
in h:

#include <QWebPage>
class DBGWebPage : public QWebPage
{
Q_OBJECT
  public:
    explicit DBGWebPage(QObject *parent = 0);
  protected:
    void javaScriptConsoleMessage( const QString & message, int lineNumber, const QString & sourceID );
};

in cpp:

void DBGWebPage::javaScriptConsoleMessage( const QString & message, int lineNumber, const QString & sourceID )
{
  qDebug() << message << lineNumber << sourceID;
}

and my webGUI's are derived from qWebView:

QWebView *webGUI = new QWebView(QTGUI_MainWindow::centralWidget());

How do I make it use the reimplementation of javaScriptConsoleMessage()?

[Konstantin Tokarev]

@McLion QWebView::setPage

[McLion]

@Konstantin-Tokarev
Thanks .. seems to be too late for today ... I don't get it to build ... dam...

[McLion]

@Konstantin-Tokarev
There's something I don't get ... probably soemthing with these C++ classes I'm always stumbling over:

#include <QWebPage>
class DBGWebPage : public QWebPage
{
Q_OBJECT
  public:
    explicit DBGWebPage(QObject *parent = 0);
    QWebPage *DebugWebPage;
  protected:
    void javaScriptConsoleMessage( const QString & message, int lineNumber, const QString & sourceID );
};

DBGWebPage::DBGWebPage(QObject *parent) :
  QWebPage(parent)
{
  //QWebPage* DebugWebPage = new QWebPage;
  DebugWebPage = new QWebPage(this);
}

QWebView * QTGUI_MainWindow::CreateNewWebGUI(int iID)
{
  // check if already existing
  if(webGUIMap.value(iID) != 0) { qDebug("GUI %d existing", iID); return false; }

  // check for max GUI count here
  if(iID > GUI_COUNT_MAX) { qDebug("GUI %d failed - Max GUI ID is %d", iID, GUI_COUNT_MAX); return false; }

  // create new webGUI and add it to the list
  QWebView *webGUI = new QWebView(QTGUI_MainWindow::centralWidget());
  webGUIMap.insert(iID, webGUI);

  // make some basic settings to the new GUI
  webGUI->setPage(DBGWebPage::DebugWebPage);
  webGUI->setObjectName(QString::fromUtf8("webGUI%1").arg(iID));
......

Fehler:object missing in reference to 'DBGWebPage::DebugWebPage'

[Konstantin Tokarev]

This post is deleted!

[mrjj]

Hi
webGUI->setPage(DBGWebPage::DebugWebPage);
I would expect be something like
DBGWebPage *page=new DBGWebPage();
webGUI->setPage(page->DebugWebPage);

The other syntax seems odd ?

[Konstantin Tokarev]

@McLion You derive DBGWebPage from QWebPage and add QWebPage* field to it, then try to use that QWebPage* field (which is vanilla QWebPage, not DBGWebPage) as it was static filed of DBGWebPage.

[McLion]

@mrjj
Thanks.
In fact, the other syntax seemed wrong.
You code builds without error, however, crashes with SIGSEGV.

[Konstantin Tokarev]

@McLion Because it should be

DBGWebPage *page=new DBGWebPage();
webGUI->setPage(page);

[McLion]

I somehow understand all you're saying, but I so far am not able to modify my code to not crash.
Currently ended up with (modified to it while Konstantin was writing it too):

DBGWebPage *page=new DBGWebPage();
webGUI->setPage(page);

and an empty constructor.
Still crashing .... I'm stumped.

[Konstantin Tokarev]

remove DebugWebPage and all code messing with it

[McLion]

Found something.
It actually works if comment 2 signal connects for the page, but I need these two.

• networkAccessManager for SSL errors
• and the JS bridge
  If the page has been set, do I need to connect these in a different way or do these now go to the wrong object?

QWebView * QTGUI_MainWindow::CreateNewWebGUI(int iID)
{
  // check if already existing
  if(webGUIMap.value(iID) != 0) { qDebug("GUI %d existing", iID); return false; }

  // check for max GUI count here
  if(iID > GUI_COUNT_MAX) { qDebug("GUI %d failed - Max GUI ID is %d", iID, GUI_COUNT_MAX); return false; }

  // create new webGUI and add it to the list
  QWebView *webGUI = new QWebView(QTGUI_MainWindow::centralWidget());
  webGUIMap.insert(iID, webGUI);

  // make some basic settings to the new GUI
DBGWebPage *page=new DBGWebPage();
webGUI->setPage(page);

  webGUI->setObjectName(QString::fromUtf8("webGUI%1").arg(iID));
//qDebug() << "New webGUI:" << webGUI;
//qDebug() << "Map:" << iID << webGUIMap.value(iID);
  webGUI->setStyleSheet(QString::fromUtf8("background-color: rgba(0, 0, 0, 0);"));
  webGUI->setUrl(QUrl("about:blank"));
  webGUI->setRenderHints(QPainter::SmoothPixmapTransform|QPainter::TextAntialiasing);
  webGUI->page()->mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
  webGUI->page()->mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
  webGUI->setGeometry(0, 0, SCREEN_SIZE_X, SCREEN_SIZE_Y);
  webGUI->setFocusPolicy(Qt::StrongFocus);
  webGUI->setMouseTracking(true);
  webGUI->setAcceptDrops(true);
  webGUIeventFilter *webGUIEvFil = new webGUIeventFilter;
  webGUI->installEventFilter(webGUIEvFil);
  webGUI->hide();

  // connect load progress and finished signals
  connect(webGUI, SIGNAL(loadProgress(int)), ui->webGUIChangeProgressBar, SLOT(setValue(int)));
  connect(webGUI, SIGNAL(loadFinished(bool)), this, SLOT(webGUI_loadFinished(bool)));

  // prepare adding objects to JavaScript (bridge from JS to native code)
//  connect(webGUI->page()->mainFrame(), SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(populateJavaScriptWindowObject()));

  // setup SSL error handling
//  connect(webGUI->page()->networkAccessManager(), SIGNAL(sslErrors(QNetworkReply*, const QList<QSslError> & )),
//  this, SLOT(HandleGUIsslErrors(QNetworkReply*, const QList<QSslError> & )));

  return webGUI;
}

[McLion]

@Konstantin-Tokarev
Did so - all removed.

[McLion]

I can not find what I'm doing wrong. The console debug works, as long as I have deactivated the JS bridge.

DBGWebPage *page=new DBGWebPage();
webGUI->setPage(page);
// the following lines that use the new page seem to work
webGUI->page()->mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
webGUI->page()->mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
// and the following line - that I need - let it crash upon boot:
connect(webGUI->page()->mainFrame(), SIGNAL(javaScriptWindowObjectCleared()), this, SLOT(populateJavaScriptWindowObject()));

If I don't use setPage() to change the page that the webView generates by default, the JS bridge works perfectly.
What am I doing wrong to use the page of my own class with the debug added AND use the JS bridge?