TypeError: Cannot read property 'length' of undefined in QML array

[TheIndependentAquarius]

thankful to you, got the point now.

[wysota]

In situations such as this it is wise to use a Component.onCompleted handler to make sure the other method only gets executed when the object is fully constructed:

Item {
  property var prop
  property var prop2
 
  property bool __constructed: false
 
  onPropChanged: {
    if(!__constructed) return
    doSomethingWith(prop2)
  }
  Component.onCompleted: {
    __constructed = true
    // do some other initial stuff
  }
}

Item {
  property var prop
  property var prop2

  property bool __constructed: false

  onPropChanged: {
    if(!__constructed) return
    doSomethingWith(prop2)
  }
  Component.onCompleted: {
    __constructed = true
    // do some other initial stuff
  }
}

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[TheIndependentAquarius]

wysota

That was very helpful - much thankful to you too.