SystemPrompt result text string manipulation does not: what am I doing wrong?

I'm trying to manipulate a "collar", I get a SystemPrompt.  Here is my code:

SystemPrompt {
    id: prompt
    title: qsTr("prompt")
    inputField.maximumLength: 16
    inputField.defaultText: prompt
    inputField.emptyText: "prompt"
    inputField.inputMode: SystemUiInputMode.NumericKeypad
    // eNum: Default = 0, Email = 1, Password = 2, Phone = 3, Pin = 4,
    //       Url = 5, Symbols = 6, NumericKeypad = 7, NumbersAndPunctuation = 8
    onFinished: {
        if (result == SystemUiResult.ConfirmButtonSelection) {
            result = inputFieldTextEntry()
            //result = result.mid(0,4) + " " + result.mid(4,4) + " " + result.mid(8,4) + " " + result.mid(12,4)
            //result = inputFieldTextEntry.mid(0,4) + " " + inputFieldTextEntry.mid(4,4) + " " + inputFieldTextEntry.mid(8,4) + " " + inputFieldTextEntry.mid(12,4)
            labelPrompt.text = result
            //labelPrompt.text = result.mid(0,4) + " " + result.mid(4,4) + " " + result.mid(8,4) + " " + result.mid(12,4)
            toast.body = "prompt result: " + result
            //toast.body = "result: " + result+ result.size // this causes the toast result.size value to be "undefined"
            toast.show()
        } // if
    } // onFinished
} // SystemPrompt

[...]

attachedObjects: [
    SystemToast {
        id: toast
        onFinished: {
        }
    }
]

I certainly made the generic object compared to my exact code names.  My problem is this: none of all the commented code works.  What I'm trying to do is to inject a space character between each 4 numbers entered via the SystemPrompt.  If I activate one of the commented lines, the soft seems to go out the onFinished SO without finishing (evidenced by the absence of toast).

I have tried to type casting toString() here and there, but that shouldn't be necessary since QML handles type casting automatically.  I tried to add a debug string size value to my bread which gives a result 'undefined' for result.size

Can someone indicate an error of my ways here?

Not subst... There

cardNumber = cardNumberTemp.substr(0, 4) + " " +
             cardNumberTemp.substr(4, 4) + " " +
             cardNumberTemp.substr(8, 4) + " " +
             cardNumberTemp.substr(12, 4)

Tags: BlackBerry Developers

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