runJavascript result returned

[Kasea]

I'm trying to get the results from my JS statements, however I don't seem to get the desired result. It just appears 2 return an empty string.

For example I load google -> runJavascript document.body. and it prints an empty string.

Is this intended? is there a workaround so I would get the desired result?

[Ginsengelf]

Hi, could you show us your code?

Ginsengelf

[Kasea]

Yeah sure, couldn't find the edit button, if there is any. so I'll post it here instead of editing main post



#include <QApplication>
#include <QWebEngineView>
#include <iostream>
using namespace std;


class Webkit: public QWebEngineView{
public:
Webkit() {
connect(this->page(), &QWebEnginePage::loadFinished, this, &Webkit::onFinishedLoading);
}
public slots:
void onFinishedLoading(bool ok);
};


void Webkit::onFinishedLoading(bool ok){
this->page()->runJavaScript("document.body;", [](const QVariant &v) { cout << "JS Result:" << v.toString().toStdString() << endl; });
}

int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDp iScaling);
QApplication app(argc, argv);

Webkit kit;
kit.show();
kit.setUrl(QUrl("http://google.com"));

return app.exec();
}


One would expect the following code to have some output on the JS result, however it's empty. (Qt 5.8)

[patrik08]

runJavaScript is to run your own javascript i think..
not script from other ...

i load Qt5::Script to test but i see javascript alert().

add_executable(${PROJECT_NAME} "main.cpp")

target_link_libraries(${PROJECT_NAME} Qt5::Core)
target_link_libraries(${PROJECT_NAME} Qt5::Widgets)
target_link_libraries(${PROJECT_NAME} Qt5::WebEngineWidgets)
target_link_libraries(${PROJECT_NAME} Qt5::Script)




#include <QApplication>
#include <QWebEngineView>
#include <iostream>

using namespace std;


class Webkit: public QWebEngineView{
public:
Webkit() {
connect(this->page(), &QWebEnginePage::loadFinished, this, &Webkit::onFinishedLoading);
}
public slots:
void onFinishedLoading(bool ok);
};


void Webkit::onFinishedLoading(bool ok){
this->page()->runJavaScript("document.body;alert(\"I am an alert box!\")", [](const QVariant &v) { cout << "JS Result:" << v.toString().toStdString() << endl; });
}

int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDp iScaling);
QApplication app(argc, argv);

Webkit kit;
kit.show();
kit.setUrl(QUrl("https://wiki.selfhtml.org/wiki/JavaScript/Objekte/Date/getFullYear"));

return app.exec();
}

[Kasea]

If it was to run my own javascripts, that'd be fine. but what would be the purpose of a result lambda option then?

Could this be a bug or is it intended?

[Ginsengelf]

If it was to run my own javascripts, that'd be fine. but what would be the purpose of a result lambda option then?
I have used this to extract info like the used font or parts of the HTML of a file.

Ginsengelf

[patrik08]

Yes or to take resultCallback ... from javascript like a pointer..
On this way i think we can use google api to translate o other external game..

[Kasea]

I see.. Well I'll find a workaround for my problem then, thanks.