Re: Adding elements to a listbox containing a collection

[Two Way Communications via 4D_Tech]

Thx Keisuke.

I am still getting to grips with the whole new paradigm that is objects, 
collections and ORDA.
The amount of information is elaborate, and often in different places.

So insights like this are really helpful.

Good thing we have the NUG ;-)

BTW, collections and ORDA are so cool! 


Rudy Mortier
Two Way Communications bvba 



> On 1 Aug 2018, at 22:44, Keisuke Miyako via 4D_Tech <4d_tech@lists.4d.com> 
> wrote:
> 
> that's right, you have to "touch" the data source object to signal that it is 
> dirty and has to be redrawn.
> 
> so, even though
> 
> col.push()
> 
> adds an element to the collection,
> in this context (listbox on form),
> you have to assign the variable to itself:
> 
> col:=col.push()
> 
> 2018/08/02 5:24、Christian Sakowski via 4D_Tech 
> <4d_tech@lists.4d.com>のメール:
> Form.cColl:=Form.cColl
> 
> 
> 
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Re: Adding elements to a listbox containing a collection

[Keisuke Miyako via 4D_Tech]

that's right, you have to "touch" the data source object to signal that it is 
dirty and has to be redrawn.

so, even though

col.push()

adds an element to the collection,
in this context (listbox on form),
you have to assign the variable to itself:

col:=col.push()

2018/08/02 5:24、Christian Sakowski via 4D_Tech 
<4d_tech@lists.4d.com>のメール:
Form.cColl:=Form.cColl



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Re: Adding elements to a listbox containing a collection

[Christian Sakowski via 4D_Tech]

You have to assign the collection to itself:

Form.cColl:=Form.cColl

Then the Listbox will be updated.
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> Am 01.08.2018 um 22:19 schrieb Two Way Communications via 4D_Tech 
> <4d_tech@lists.4d.com>:
> 
> I guess I must be overlooking the obvious here …
> I searched the documentation, the NUG, the Blog but could not find an answer, 
> so maybe somebody can help me out.
> 
> I have a collection that is being displayed inside a listbox. So far so good. 
> No issues. I can select the rows and I can edit the cell contents.
> 
> Now, I want to add a row, and enter values.
> 
> Here’s where it goes wrong. I cannot get the row to display, let alone edit 
> it.
> 
> Since ‘LISTBOX INSERT ROWS’ only works with arrays, I tried cColl.push, which 
> actually adds an element to the collection (I verified in the debugger)
> But the row is not added to the listbox, no matter what I try (i.e. 
> REDRAW(Listbox))
> 
> The next challenge will be to delete an element …
> 
> Has anybody done this successfully?
> 
> 
> Rudy Mortier
> Two Way Communications bvba 
> 
> 
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