[Qt-qml] How to get list of map's keys?

[petrus.lundqvist at nokia.com]

You have described a JavaScript object using JSON notation - not a QML map as you call it. In JS you iterate keys in objects (which do double duty as maps) using for-in loops.

The documentation you seek can be found in JavaScript books or tutorials - not Qt ones.

Peppe

-----Original Message-----
From: Malmqvist Mathias (Nokia-MS/London)
Sent:  19.12.2010, 17:19
To: qt-qml at qt.nokia.com
Subject: [Qt-qml] How to get list of map's keys?

Hi everyone,

How can I get a list of the keys in a QML map?

Defining a map like this works:
property variant theMap: { "key1":"value1", "key2":"value2", "key3":"value3" }

Now I want to know all the keys used in the map, i.e. something like this
function keys() {
    var theKeys = theMap.keys();
    return theKeys;
}

that I would expect to return an array like this:
["key1", "key2", "key3"]
but it seems the map object doesn't have a keys() function, or anything else similar I've tried.
Is that so, or have I just not found the right syntax?

The map type is missing from the documentation of basic QML types:
http://doc.qt.nokia.com/4.7-snapshot/qdeclarativebasictypes.html
(see http://bugreports.qt.nokia.com/browse/QTBUG-16196)


Cheers
Mathias

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