Can't read QStringList from QML/JavaScript function

Question

I have a QML class that has a function in it with a QStringList as a parameter. I'm able to access other items in the C++ model from QML just fine.

In my QML:

function recentFiles(recentFilesList)
{
    //This writes "0" for some reason, although it should be "3"
    console.log(recentFilesList.length)

    //Causes error: "Unable to assign [undefined] to QString"
    return recentFilesList[0]
}

...

Text {
    text: recentFiles(rootObject.myModel.recentFiles)
}

In my source file:

QStringList someModel::recentFiles() const
{
    QStringList recentFiles;

    recentFiles << "A" << "B" << "C";

    return recentFiles;
}

In my header file:

Q_INVOKABLE QStringList recentFiles() const;

Ultimately, I'm trying to get my QStringList to work on a QML ListView object where it will display like this:

A
B
C

Kuba hasn't forgotten Monica · Accepted Answer · 2014-01-28 20:21:19Z

2

I think this is not a method call on myModel, you're passing recentFiles whatever passes for an invokable method wrapper in QML:

Text {
    text: recentFiles(rootObject.myModel.recentFiles)
}

You want to call the recentFiles method:

Text {
    //                                              vv !
    text: recentFiles(rootObject.myModel.recentFiles())
}

Alas, if your string list is mutable and can change while the UI is displayed, you should simply use a QStringListModel.

answered Jan 28, 2014 at 20:21

Kuba hasn't forgotten Monica

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2 Comments

roundtheworld Over a year ago

Doh! I wish it would have thrown a compilation-like error...thank you!

Kuba hasn't forgotten Monica Over a year ago

@user1595510 It's still valid code, there's no error, it just doesn't mean what you think it means :) You can, of course, type check the arguments, but that's only of benefit if you do it everywhere.

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