Use of <object> from javascript to Qt c++ ( example in this post )

i'm reading a book about Qt, there is an example that i don't understand, where we use an html page : i don't understand how all the <object> from the html page are "analyzed" by the c++ : i was looking at the BrowserWindow class, where the logic seems to happen : new BrowserWindow(url, new WebPage); but i did not find anything there...

Here's the code : first we have an html page with several <object> :

<object type="application/x-qt-plugin" classid="QLineEdit"
    id="nameEdit" height="30">Can't load QLineEdit plugin!</object>
<object type="application/x-qt-plugin" classid="MatrixWidget"
    id="leftMatrix" width="124" height="94" readonly="1">
Can't load MatrixWidget plugin!</object>

Then we have a WebPage class that is supposed to analyse the html : createPlugin responds to the type "application/x-qt-plugin" :

QObject* WebPage::createPlugin(const QString &classId,
        const QUrl&, const QStringList &parameterNames,
        const QStringList &parameterValues)
    QWidget *widget = 0;
    if (classId == "MatrixWidget") {
        widget = new MatrixWidget(view());
        int index = parameterNames.indexOf("readonly");
        if (index > -1)
    else { ...

And the main.cpp is :

QString url = QUrl::fromLocalFile(AQP::applicationPathOf() +
    BrowserWindow *browser = new BrowserWindow(url, new WebPage);

And the browserWindow class constructor is :

BrowserWindow::BrowserWindow(const QString &url, QWebPage *webPage,
                             QWidget *parent, Qt::WindowFlags flags)
    : QFrame(parent, flags)

    webView = new QWebView;
    if (webPage)


So, my question is : how do we check all the <object> in the html file?

Thanks for your help


When QtWebKit is parsing the webpage, if it finds an <object> tag with a type="application/x-qt-plugin" attribute, it will call the QWebPage::createPlugin function to try to create the plugin.

You don't have to explicitly check the object tags, QtWebKit does this all for you and converts it into the createPlugin call.

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