Load a .QML with a button ERROR

[DropNod]

Hi, I am a beginner on Qt and for two days I have a problem that I can not solve. I devellope an application in QML and I would like a page (.qml file) opens thanks to a button, after many researches on forums I found what I needed: QML Loader. Summary of my code:

Window {
     id : window
     visible: true
     width: Screen.width
     height: Screen.height
     x: 0
     y: 0

                Button {
                      id: button_1_button
                      x: 0
                      y: 0
                      width: 245
                      height: 61
                      onClicked: loader.source = "window2.qml"
                }

                Loader {id: loader}
}

When I execute my application everything is fine, but when I click on the button, nothing works, it crashes. However, while giving the source directly to the Loader, "window2" opens. I do not know where the problem comes from.

Thanking you in advance for your proposals =)

(sierdzio) edit: added missing code tags.

[sierdzio]

If it works with direct source, but not when set via script, I would say it is a Qt bug you've found :-)

A solution that could work:

Button {
  onClicked: loader.toggle = !loader.toggle
}

Loader {
  id: loader
  property bool toggle: false
  source: toggle? "window2.qml" : undefined
}

Some further thoughts:

• you should (actually you have to) name QML components with a capital letter. So the file should be named "Window2.qml" - this way QML engine will treat it as a component
• there are other ways to show a new "page": you can use StackView, SwipeView, Dialog, Popup components, for example
• there is no need to specify x, y positions, they are zero by default
• for item positioning, it's best to use Layouts, second best - anchors. Manual positioning by x, y and hardcoded dimensions is harder to work with - and also slower in performance

[DropNod]

Thank you for your answer, I ended up finding the solution to my problem. The .qml file contained a window and loaded another .qml which was also a window. I replaced the loaded .qml window with a page and now everything works!