B4J Question How to refresh a page when using B4XPages

mcorbeel · Dec 17, 2020

I just began with the B4XPages and I must say that this is a huge improvement. I like it. But i am facing an issue with refreshing data on another page. I always get the message that the object is not initialized. It's obvious that I am doing someting basic wrong. Can someone put me on the right track here? I made a small project that you can open with B4J to show the issue... Thank you!

mcorbeel · Dec 17, 2020

extra note: I prefer using code to generate views, not layout files.

klaus · Dec 17, 2020

You should move these two lines from GotoNext to B4XPage_Created.

B4X:

    Page_Result.Initialize
    B4XPages.AddPage("Page_Result", Page_Result)

In your case, you create a new page each time you click on a Button.
You should initialize the Page only once!

mcorbeel · Dec 17, 2020

Just tried this and it works.
I put the Root view of the result page in a global variable. But is this the best way of doing it?

B4X:

Private Sub B4XPage_Created (Root1 As B4XView)
    Log("Page_Result B4XPage_Created")
    'declared variable "ResultView" in main module
    Main.ResultView = Root1
End Sub

private Sub B4XPage_Appear()
    Main.ResultView.RemoveAllViews
   
    Label.Initialize("Label")
    Main.ResultView .AddView(Label, 20dip, 20dip, 200dip, 40dip)
   
    Label.Text = "You clicked button " & Main.ButtonClicked
End Sub

mcorbeel · Dec 17, 2020

klaus said:
You should move these two lines from GotoNext to B4XPage_Created.

B4X:

Page_Result.Initialize B4XPages.AddPage("Page_Result", Page_Result)

In your case, you create a new page each time you click on a Button.
You should initialize the Page only once!

Indeed Klaus, that did the trick. Thank you for your help!

B4J Question How to refresh a page when using B4XPages

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