Inject script in QWebFrame

inject-script-in-qwebframe.cpp

QObject::connect(ui->webView, SIGNAL(loadFinished(bool)), this, SLOT(loadedWebView(bool)));

...

void Form::loadedWebView(const bool a) {
    Q_UNUSED(a);

    QString scriptContent = "function TEST() { alert(1); }";
    QString injectionJS = "(function() { var newdom = document.createElement('script');";

    injectionJS.append("newdom.innerHTML = String((");
    injectionJS.append(scriptContent);
    injectionJS.append("));");
    injectionJS.append("document.body.appendChild(newdom)");
    injectionJS.append("})();");

    ui->webView->page()->mainFrame()->evaluateJavaScript(injectionJS);
    ui->webView->page()->mainFrame()->evaluateJavaScript("TEST(1);");
}