B4J Question [ABMaterial] Reading text from an ABMInput on sub table giving an error

John Naylor · Nov 30, 2020

ABM 4.51, B4J 8.5

I'm experiencing a similar problem to one which I had here however without a container being involved.

I've created a table, each row of which can have multiple sub tables. Each of those sub tables has an ABMInput control on it.

I can access all the controls and can read text in all the normal fields. I can get a link to the ABMInput control. When i try to read the text that I've typed into it I get a NullPointerException.

Code that I'm using to check things...

B4X:

            'Ok that's the main table row done - now to whatever data is in the subtables
            
            Dim SubTable As ABMTable = StockSearchTable.GetComponent (0,"UID" & m.Get("id"))
            SubTable.PrepareTableForRetrieval
            
            For y = 0 To 999
            
                Dim s As Map
                s.Initialize

                s.Put("did",m.Get("id"))               
                s.Put ("sid",SubTable.GetString(y,0))    'This works fine and returns a value

                Dim stb As ABMInput = SubTable.GetComponent(y,"usetb" & y)  'This also works and I get the ABMInput control
                
                Dim t As String = stb.Text   'This throws an error
                
                s.Put ("QtyStock", t)
                
                
                stable.Add(s)
            Next

I've checked futuretext and it's not showing anything - as follows...

error as soon as I try to read the text field

Any thoughts? Bug? Something in my setup?

TIA!

alwaysbusy · Nov 30, 2020

this look weird:

B4X:

For y = 0 To 999

Looking at your log ABM was able to get some of them. Is is just possible that y has reached a number where the "usetb" & y does not exist? Maybe put a log(y) in the loop.

Alwaysbusy

John Naylor · Nov 30, 2020

alwaysbusy said:
this look weird:

B4X:

For y = 0 To 999

Looking at your log ABM was able to get some of them. Is is just possible that y has reached a number where the "usetb" & y does not exist? Maybe put a log(y) in the loop.

Alwaysbusy

Sadly not - this is at its first itteration through the loop and there is definitely data there. The test table(s) have two rows in the main and 3 sub tables. I do as expected get an error when I have checked all of those.

alwaysbusy · Nov 30, 2020

In your first screenshot I see that futuretext = null which shouldn't be. Try to add a Page.ws.flush after

B4X:

Dim stb As ABMInput = SubTable.GetComponent(y,"usetb" & y)
Page.ws.flush

alwaysbusy · Nov 30, 2020

if the above does not work, can you make a screenshot like the first one where I can see all the properties of the ABMInput?

John Naylor · Nov 30, 2020

alwaysbusy said:
if the above does not work, can you make a screenshot like the first one where I can see all the properties of the ABMInput?

No luck with that.

Screenshots attached - should I drill down further in any particular areas?

alwaysbusy · Nov 30, 2020

Maybe if you can just in the Browser - F12 check what the exact id of such an input is (it will probably be something like uid247_0_7__usetb0). I was hoping the ParentString in your screenshots would reveal that. I just don't get why the future is null, and without it, it can not retrieve the text value.

If we have the exact ID, we can then try this manually:

B4X:

Dim txt As JQueryElement = page.ws.GetElementById("whateverexactidwegot")
Dim text As Future = txt.GetVal
Log(text.Value)

It is in theory the same as what ABM does internally.

Alain

John Naylor · Nov 30, 2020

alwaysbusy said:
Maybe if you can just in the Browser - F12 check what the exact id of such an input is (it will probably be something like uid247_0_7__usetb0). I was hoping the ParentString in your screenshots would reveal that. I just don't get why the future is null, and without it, it can not retrieve the text value.

If we have the exact ID, we can then try this manually:

B4X:

Dim txt As JQueryElement = page.ws.GetElementById("whateverexactidwegot") Dim text As Future = txt.GetVal Log(text.Value)

It is in theory the same as what ABM does internally.

Alain

Doing it this way logs the value that I've typed into the input box!

Harris · Nov 30, 2020

You must trap for null values - as I have found...
example:

B4X:

    ' you must be careful with NULL fields...  or you will crash!
            If tblFields.Get("casesummary") = Null Or tblFields.Get("casesummary") = "" Then
                Dim descs As String = "-" 'tblFields.Get("casesummary") is null or blank...
            Else
                Dim descs As String = tblFields.Get("casesummary")
            End If

John Naylor · Nov 30, 2020

Harris said:

You must trap for null values - as I have found...
example:

B4X:

    ' you must be careful with NULL fields...  or you will crash!
            If tblFields.Get("casesummary") = Null Or tblFields.Get("casesummary") = "" Then
                Dim descs As String = "-" 'tblFields.Get("casesummary") is null or blank...
            Else
                Dim descs As String = tblFields.Get("casesummary")
            End If

Not a null issue in this case as it falls over on the first iteration and there's definately data there.

My code was initially just to make sure I was getting what I expected - I'll make sure to trap null once I've figured out what's going on though.

B4J Question [ABMaterial] Reading text from an ABMInput on sub table giving an error

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