QML Listview and c++: ReferenceError Model not defined

Question

I want to display my C++ class as a ListView in QML. I have an empty vector, which will later be filled:

QList<QObject*> _myList;

and set the context

QQmlContext *ctxt = _eng->rootContext();
ctxt->setContextProperty("modelName",QVariant::fromValue(_myList));

In the qml file I have

ListView {
    id: listView
    model: modelName
    delegate: myDelegate {}
}

But when starting the application I get the following error

qrc:/screen2.qml:252: ReferenceError: modelName is not defined

What am I doing wrong? Strangly, the error does not prevent the list from being correctly displayed once it is filled.

GrecKo GrecKo · Accepted Answer · 2017-09-20T11:19:56

Call setContextProperty before loading your QML file.

When you load your QML file, the engine evaluates its bindings, since you haven't yet set the context property for modelName, it outputs a warning. When you set it afterwards, this binding is reevaluated and that's why the list is eventually correctly displayed in your case.

QML Listview and c++: ReferenceError Model not defined

1 Answers