ListView - store id inside elements

[noszone]

I have some data set like:

id 12323, name - John,
id 12324, name - Bob,
...

I want to store these ids in each item of ListView elements.

So when I want to read id, something like:

Code: Pascal  [Select][+][-]

1. id:=ListView1.Items[i].index?

But in this case it gives only incremental id like 0,1,2,3,4,5..

I've tried:

Code: Pascal  [Select][+][-]

1. ListView1.AddItem('test',TObject(3));

But seems it's wrong.

[KodeZwerg]

I do not know if I understand you correct ....
Create a Column for it, add to that your ID, either set Visible to True or False if you want to display or just store it.

[TRon]

One thing is for sure: you can not use the index to abuse for your own amusement. A listview is a collection and the index refers to it's index in the list..

It is usually ok to abuse attached objects (such as in a stringlist) to contain a number (be very careful with casting). But it is not considered neat programming. I have no idea if tlistview allows that.

[KodeZwerg]

To store:

Code: Pascal  [Select][+][-]

1.        with YourListView.Items.Add do
2.         begin
3.           Caption := 'your main caption';
4.           SubItems.Add('your id as text');
5.         end;

To read:

Code: Pascal  [Select][+][-]

1. s := YourListView.Items.Item[TheIndexPosition].SubItems[0];

[noszone]

Thank you, I missed, don't know the columns are present. I will try also idea with subitems.

[KodeZwerg]

Thank you, I missed, don't know the columns are present. I will try also idea with subitems.

In my above snippet, there you should have already a tlistview with at least 2 columns.
The first column you can access direct, the 2nd is than "SubItem[0]" and so on...

You are welcome!

[Zvoni]

Nevermind that using a ListView for something like this is actually a misuse.
Use TStringGrid instead

[noszone]

What if I want to use CheckListBox? Is something similar is possible? I guess the CheckListBox is more user-friendly when selecting multiple items, while in ListView Ctrl key on keyboard must be hold always.

[Zvoni]

What if I want to use CheckListBox? Is something similar is possible? I guess the CheckListBox is more user-friendly when selecting multiple items, while in ListView Ctrl key on keyboard must be hold always.

A TCheckListBox has "Items" which are TStrings, which in turn have AddObject.....

[Thaddy]

Storing extra data in a visual control is bad design anyway. Better to do that in the TStrings, so you can assign that to any control with a Tstrings property (strings, items).

[Zvoni]

Storing extra data in a visual control is bad design anyway. Better to do that in the TStrings, so you can assign that to any control with a Tstrings property (strings, items).

Thaddy, at a guess: OP's coming from Visual Basic (or similiar), and there List-Controls (ComboBox, ListBox) do in fact have a separate property for stuff like that (if memory serves called "ItemData" -DataType Integer) which is even "sorting-aware".

That said: Agree with you

[Thaddy]

Thaddy, at a guess: OP's coming from Visual Basic (or similiar), and there List-Controls (ComboBox, ListBox) do in fact have a separate property for stuff like that (if memory serves called "ItemData" -DataType Integer) which is even "sorting-aware".

The objects property is already in TStrings and is equal to ItemData.

[balazsszekely]

What if I want to use CheckListBox? Is something similar is possible? I guess the CheckListBox is more user-friendly when selecting multiple items, while in ListView Ctrl key on keyboard must be hold always.

Yes it's possible. See attached project.

[cdbc]

Hi
To store an integer value, quick'n'dirty:

Code: Pascal  [Select][+][-]

1. ListItem.Data:= pointer(111); // or pointer(Int1);
2.  

and to get it back again:

Code: Pascal  [Select][+][-]

1. var Int1: ptrint;
2. ...
3. Int1:= ptrint(ListItem.Data);
4.  

Hth - Regards Benny

[noszone]

Thanks for all replies, I got new stuff to test and new ideas.

I tested some of them, and end up with something like this for now:

Code: Pascal  [Select][+][-]

1. CheckListBox1.Items.AddObject('test',Tobject(232323)); //id from database to keep inside element
2. showmessage(inttostr(integer(CheckListBox1.Items.Objects[0]))) //reading the value 232323 from CheckListBox

Hope it will work in loop, I didn't end the whole code yet. I'm storing these ID's in visual element, cause I will need to know which elements from CheckListBox a user has been selected.