runJavascript result returned

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?

Hi, could you show us your code?

Ginsengelf

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

Code:

---

#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_EnableHighDpiScaling);
    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)

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)

Code:

---

#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_EnableHighDpiScaling);
    QApplication app(argc, argv);
 
    Webkit kit;
    kit.show();
    kit.setUrl(QUrl("https://wiki.selfhtml.org/wiki/JavaScript/Objekte/Date/getFullYear"));
 
    return app.exec();
}

---

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?

Quote:

---

Originally Posted by 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?

---

I have used this to extract info like the used font or parts of the HTML of a file.

Ginsengelf

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..

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