B4J Question How to disable TableView SelectedRowChanged?

gezueb

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I have a program that displays a tableview. When I click on a row, a SelectedRowChanged event is triggered. This sub calls another form with some detail info about the item clicked. The tableview is closed. So far so good.
When I leave the detail form I want to return to the form with the original tableview. As soon as it is started, it triggers the SelectedRowChanged event again, but with row index - 1 which blows up the code or loops forever if catched on this condition. How can I reset this event so that it triggers only when a row is clicked again? I have tried TableView.clearselection, to no avail. Many thanks for advice.
 
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micro

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Hi
Can you use a JavaObject
B4X: 
Dim jo As JavaObject = TableView
jo.RunMethodJO("getSelectionModel",Null).RunMethod("clearSelection",Null)
 
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gezueb

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Thank you, Micro, I tried this already. Seems to do the same as TableView.clearselection. It triggers the event again, but with row index -1!
 
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Andrew (Digitwell)

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What is the code in your SelectedRowChanged Event?

I have and example:
B4X: 
Sub tvCityLocations_SelectedRowChanged(Index As Int, Row() As Object)
    Log("selected row changed to " & Index)
    If (Index > -1 And Index < tvCityLocations.Items.Size) Then
        Private mp As Map = Row(4)
        Private name As String = mp.Get("slug")
        Private Marker As Marker= msCityCenter.GetMarkerFromName(name)
        If (Marker <> Null) Then
            msCityCenter.ShowMarkerInfo(Marker)
        End If
    End If
End Sub

and it works as you would expect. The table contains a hidden row, row(4) with data in it.
 
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gezueb

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Micro:
If Index = -1 then Return

That was the first thing I tried. I have not yet found out where the return leads to. But maybe I did it the wrong way.

Digitwell: I do something similar. It works well if I leave the Tableview in the background. Then, on return, the same selected row is highlighted again and all is well. I wanted to re-do the tableview from scratch to make sure my database access is properly initialized, but that does not work as it triggers the ...changed event (again).
 
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Andrew (Digitwell)

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I would say that this is normal behavior as when you clear the tableview to recreate it, you are implicitly deselecting the previously selected item.

I have not yet found out where the return leads to. But maybe I did it the wrong way.
Click to expand...

Why do you need to know?
 
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gezueb

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That's what I assume too (that the previously selected item is gone after restart). However, what seems to be still lurking is the associated changerow event. Anyway, thank you for your help. I keep that tableview live and return to it which works perfectly okay (row still selected until klicked otherwise).
 
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MicroDrie

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I have a program that displays a tableview. When I click on a row, a SelectedRowChanged event is triggered. This sub calls another form with some detail info about the item clicked. The tableview is closed. So far so good.
Click to expand...
Well, you leave a selection process and go back to that situation without flagging the processing of the triggered action. What about to add a routine to show the updated result again without a selection before you call the other form?
 
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Daestrum

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Could you not just hide the TableView (visible=false) then when you have shown the details simply show the TableView again (visible=true) this will keep the selection and not trigger the SelectedRowChanged event.
 
Last edited:
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gezueb

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Thanks all of you, problem is solved with your help! I will keep the tableview in th ebackground (hidden or not)!
 
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