signal no disconnection when the page is closed by the gesture of eye?

Hello

Falling on a particular issue... First of all, I connect my context object to signal a bit of javascript using the onCreationCompleted

onCreationCompleted:
{
        // When the top-level Page is created, direct the data source to start
        // loading data
        MyObject.signal_1.connect(onJavaScriptFunction_1);         MyObject.signal_2.connect(onJavaScriptFunction_2);               MyObject.signal_3.connect(onJavaScriptFunction_3); }

So far everything is going well, but if I unplug these signals, the page is busted, so the next time that the page is created, these signals will be attached to the same javascript function once more and so on for every time that the page is re-created.

Then I thought, I should unplug these signals when the page came out... Therefore, I have given the NavigationPage because I couldn't see any signal onPopped or onDestroy... So I used the following code:

    paneProperties: NavigationPaneProperties
    {
        backButton: ActionItem
        {
            onTriggered:
            {
                console.debug("Popping page, disconnect signals...")                // Disconnect signals
                MyObject.signal_1.disconnect(onJavaScriptFunction_1);                      MyObject.signal_2.disconnect(onJavaScriptFunction_2);                 MyObject.signal_3.disconnect(onJavaScriptFunction_3);

                // define what happens when back button is pressed here
                // in this case is closed the detail page
                navigationPane.pop();
            }
        }
    }

After testing a few creation of the page / page popping, everything works fine. Signal is attached only once. But every time I close the page by using the gesture of look, then I suddenly I begin to see multiple signals attached to my context object... as directed by the console log output:

emit > signal_1
onJavaScriptFunction_1()
onJavaScriptFunction_1()
emit > signal_2
onJavaScriptFunction_2()
onJavaScriptFunction_2()

My questions

Where can I sign out signals to avoid leaving the unwanted signals connection?
All the QML object seems to have a signal of {onCreationCompleted}, is an onDestroyCompleted or something similar?

Thank you

Hello

There is no equivalent onCreationCompleted.

But you can set a JavaScript function such as

Page {
  function cleanup() {
    // disconnect signals here
  }

and call from NavigationPane onPopTransitionEnded:

NavigationPane {
  onPopTransitionEnded: {
    page.cleanup()
    page.destroy() // destroy the page if it was created dynamically
  }

UPD: another option is to use the element of connection of QtQuick. According to this thread, it works in Cascades:

http://supportforums.BlackBerry.com/T5/native-development/QML-connections-element/m-p/2063301#M9550

Connect/disconnect signals automatically, but I haven't checked this app cascading.

Tags: BlackBerry Developers

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signal no disconnection when the page is closed by the gesture of eye?

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