Android Question Open B4XPage with the required parameter.

[Sergey_New]

I use a common function to open Activity2 from Activity1 with the required parameter.
Activity1

function.openData("Activity2"),"setData", key)
'    for other pages, the "setData" procedure will be different

function

Sub openData(CallBack As Object, fn As String, key As String)
    CallSubDelayed2 (CallBack, fn, key)
End Sub

Activity2

Sub setData(key)
'    ...
End Sub

What is the correct way to do this in B4XPages for Page1 and Page2?
My version:
Page1

function.openData("Page2","setData", key, False)

function

Sub openData(IdPage As String, fn As String, key As String)
    B4XPages.ShowPage(IdPage)
    CallSubDelayed2 (B4XPages.GetPage(IdPage), fn, key)
End Sub

It is right?

 

[Rubsanpe]

Hi. There may be other options but you can directly call the function of the B4XPage through the page created in B4XPages.MainPage

B4XPages.MainPage.<variable page definition>.setData(key)

Rubén

 

[Erel]

'in page2
Public ShowWithParameter (SomeParameter As Int)
 'Do something with SomeParameter
 B4XPages.ShowPage("page2")
End Sub

page2.ShowWithParameter(15)

 

[Sergey_New]

Erel, I don't understand. I need to use the openData procedure located in the function module.
What code is needed in Page1, Page2 and function module?

 

[LucaMs]

It is right?

Yes.

 

[Sergey_New]

Thank you LucaMs!

 

[Andrew (Digitwell)]

Here is a modified 3 page example with passing parameter.

 

[Sergey_New]

Here is a modified 3 page example with passing parameter.

Please tell me how to pass a parameter from Page3 to Page2 if Page2 is initialized in B4XMainPage.

 

[William Lancee]

In B4XPages the (1) Initialization, (2) Registration (Add or AddPageAndCreate) is usually done in B4XMainPage.

When you want to show a page, it can be anywhere in your app.
Creating a page is only done once, usually by loading some layout and running some setup code.
If Show is called and the page has not yet been created it will do it before displaying the page - BUT only the first time.
Creation is a one-time event.

Show triggers "Sub B4XPage_Appear". It has no parameters (By design, since the parameter signature could vary from page to page.)

If the page needs to be modified before being shown it should be done in "Sub B4XPage_Appear".
If you want to pass parameters when showing a page, first set the values of Public variables in that page.
This includes names of page specific functions that you can invoke with CallSub and CallSubDelayed.

 

[Sergey_New]

William Lancee, I read this.
In the example from post #7, I ask you to change the opening of Page2 from Page3.

 

[Andrew (Digitwell)]

In page3

defin

Definition

private page2 as Page2

' somewhere in page 3, say a button click event

    Page2.Page2PassParam("From page 3")

 

[Sergey_New]

In page3

Writes that Page2 is not initialized. Could you do it in the example from the post #7?

 

[Andrew (Digitwell)]

Try this. Added a button in Page 2.

In page 3,

Private Sub btnPage2_Click
    B4XPages.MainPage.page2.Page2PassParam("From Page 3")

End Sub

 

[Sergey_New]

Andrew (Digitwell) is what I wanted. Thanks a lot!