Cannot set QVariantMap as QML property

Question

I want to export a QVariantMap property to QML, so I'm doing

Q_PROPERTY(QVariantMap myData READ myData)

and in myData() function I just do

QVariantMap map;
map.insert("ExampleKey", "key");
return map;

and in QML either

myData.ExampleKey //undefined

or

myData["ExampleKey"] //undefined

Could someone point me in the right direction to be able to use this as a simple JS object?

You have the Q_OBJECT macro in your class that inherits QObject, yeah? — László Papp, Dec 21 '14 at 16:44
Also, the read function is definitely not called (qdebug doesn't show up) — user2563892, Dec 21 '14 at 16:48
That would take a lot of time and I'm sure it works outside a context property as well — user2563892, Dec 21 '14 at 16:50
It would take a lot of time to expose a context property? It is a very minor addition for testing. It would help localizing whether your issue is the class and/or the way you try to expose it. Anyway, we do need an [SSCCE](http://sscce.org). — László Papp, Dec 21 '14 at 16:51
Here's the header (where most of the code is). The cpp only has the Q_INVOKABLE methods https://paste.kde.org/phwifivrh/pmekma — user2563892, Dec 21 '14 at 17:00

Alexander V · Answer 1 · 2014-12-22T16:10:32.470

-1

Thanks BaCaRoZzo for finding the optimal answer. Basically QML JavaScript uses QVariantMap for its array. Nothing more needs to be done, use JavaScript array and you get QVariantMap and it is transportable to C++.

The QML engine provides automatic type conversion between QVariantList and JavaScript arrays, and between QVariantMap and JavaScript objects.

http://doc.qt.io/qt-5/qtqml-cppintegration-data.html#qvariantlist-and-qvariantmap-to-javascript-array-and-object

edited Dec 22 '14 at 16:10

answered Dec 22 '14 at 08:12

Alexander V

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[Javascript-side example in the documentation](http://doc.qt.io/qt-5/qtqml-cppintegration-data.html#qvariantlist-and-qvariantmap-to-javascript-array-and-object). – BaCaRoZzo Dec 22 '14 at 08:49

Cannot set QVariantMap as QML property

1 Answers1