Hi Sebastian,
Can you try this (I preferred using !! to verify if a variable is defined and
not null):
@
text: !!Controller ? Controller.triedSteps : “”
@
BR
Fabrice
Von: Interest <interest-boun...@qt-project.org> Im Auftrag von m...@herrdiel.de
Gesendet: Donnerstag, 17. Oktober 2019 12:41
An: interest@qt-project.org
Betreff: Re: [Interest] Binding based on typeof doesn't work any more
Hi again,
I've found a better (JavaScript-) workaround without a dummy property:
@
text: { return ((Controller === "undefined" || !Controller) ? "" :
Controller.triedSteps) }
@
But still: Why has the behavior been (apparently) changed at all in the first
place? Or is it a bug after all?
BR
Sebastian
Am 17.10.2019 um 09:20 schrieb m...@herrdiel.de<mailto:m...@herrdiel.de>:
Hi,
I have a simple Label that has to show a property of a rootProperty, the latter
not yet being created when the qml is loaded/created. Quite frequently I use
this construct and it did work perfectly in older Qt versions (something before
12.1 - that's the earliest I have installed now):
@
//[main.qml, inside a Label]
text: typeof Controller === "undefined" ? "" : Controller.successfulSteps
@
Now this doesn't show anything anymore. The following workaround does show the
desired result:
@
property string dummy: ""
text: dummy+(typeof Controller === "undefined" ? "" :
Controller.successfulSteps)
@
This seems very hackish. Is there a better way to achieve this? Why has the
behavior been (apparently) changed at all in the first place?
The Controller has been set as a root property after loading the QML page:
@
//[main.cpp]
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
Controller controller(&engine);
engine.rootContext()->setContextProperty("Controller",
QVariant::fromValue<Controller*>(&controller));
@
I've asked this in forum.qt.io before
(https://forum.qt.io/topic/107828/binding-based-on-typeof-doesn-t-work-any-more)
BR
Sebastian
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