QML Variant property undefined

[dalishi]

Hi i have a basic QML question might be stupid. I saw in this QML map viewer example, markers is defined as a variant property.

Map {
    property variant markers

and later directly use like an array

var count = map.markers.length

How the QML knows this is an array? I must have done something wrong, I actually got the following error:

TypeError: Cannot read property 'length' of undefined

[ODБOï]

@dalishi hello
Can you please show a how are you trying to access that property in your QML file ?

[dalishi]

Hi @ODБOï just like this

var count = map.markers.length

I guess QML does not know it is an array, and I found two ways to solve it

Map {
    property variant markers: []

or

Component.onCompleted: {
        markers = new Array(0);
    }

i'm not sure if this is the right way to do it. I'm still learning QML.

[ODБOï]

@dalishi as you can read here the variant type is obsolete now, you should use var and declare it similar to what you did

 property var markers: []

[dalishi]

@ODБOï thanks.

[ODБOï]

@dalishi you're welcome 😉