How Do Delete The Checked Items of a TCheckListBox

How To Check Which are the Checked Items and remove them
within my TListCheckBox
LVL 2
k6__Asked:
Who is Participating?
 
viktornetCommented:
OK, i tested it and here is what I got...

I've got a TCheckListBox and two buttons... under one of the button's OnClick() I've got this code to add the number from 1 to 10 in the listbox...

var
  i : integer;
begin
  for i := 1 to 10 do
    LB.Items.Add(IntToStr(i));
end;

then I might check a few of them or all of them and then I use this code in the second button's OnClick() so it deletes all the checked items...

var
  i : integer;
begin
  for i := LB.Items.Count - 1 downto 0 do
    if LB.Checked[i] then
      LB.Items.Delete(i);
end;

Everything works as it should...

If you didn't copy and paste the code you might have missed the COunt - 1 or you might have done it for i := 0 to List.Items.Count - 1 which will occur also in Out Of Bounds because if you have 10 items and delete 1 then there would not ba an item 10 when the FOR loop gets to there...

Try copying and pasting the code and everything should work fine....

we use DOWNTO and not TO in the for loop so it doesn't give OUt oF Bounds...

-Viktor
--Ivanov
0
 
viktornetCommented:
CheckListBox.Checked[CheckListBox.ItemIndex] := true;

-Viktor
--Ivanov
0
 
kretzschmarCommented:
hi k6__,

procedure TForm1.Button1Click(Sender: TObject);
var i : integer;
begin
  i := 0;
  while i < checklistbox1.Items.Count -1 do
  begin
    If Checklistbox1.Checked[i] then
    begin
      Checklistbox1.Items.Delete(i);
      dec(i);
    end;
    inc(i);
  end;
end;

meikl
0
Cloud Class® Course: Microsoft Office 2010

This course will introduce you to the interfaces and features of Microsoft Office 2010 Word, Excel, PowerPoint, Outlook, and Access. You will learn about the features that are shared between all products in the Office suite, as well as the new features that are product specific.

 
philipleighsCommented:
of this:

var i: integer;
begin
  for i := CheckBox1.Items.Count - 1 downto 0 do
    if CheckBox1.Checked[i] then
      CheckBox1.Items.Delete(i);
end;
0
 
viktornetCommented:
oh you asked to remove them if they are checked??

ok, then philip's solution would be the best...

for i := CheckBox.Items.Count - 1 downto 0 do
  if checkbox.checked[i] then
    checkbox.items.delete(i);

that would be the solution...
0
 
k6__Author Commented:
None of the solutions worked..

i got list out of bounds or it doesn't delete the last checked
item.. etc

any ideas ?
0
 
kretzschmarCommented:
hi k6__,

sorry a little mistake of my comment in the line

  while i < checklistbox1.Items.Count  - 1 do

should be

  while i < checklistbox1.Items.Count  do


procedure TForm1.Button1Click(Sender: TObject);
  var i : integer;
begin
  i := 0;
  while i < checklistbox1.Items.Count  do
  begin
    If Checklistbox1.Checked[i] then
    begin
      Checklistbox1.Items.Delete(i);
      dec(i);
    end;
    inc(i);
  end;
end;

Then its works perfectly

meikl

0
 
k6__Author Commented:
Yup =) Works !

Thanx

0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.