Solved

accessing multiple components on a form

Posted on 1997-08-25
7
185 Views
Last Modified: 2011-08-18
I am trying to create a simple stationary database for use in my job.I have created a form displaying labels 26 Districts, together with the edit boxes to capture the input. This will then be fed into an array.

Is it possible to cycle through the contents of each
editbox and place them into an array ?

I would be grateful for any help or any pointers.

Thanks

Darren Millin  
0
Comment
Question by:DMillin
7 Comments
 
LVL 1

Accepted Solution

by:
sxh earned 50 total points
ID: 1342495
hi DMillin

If I am correct, you want to cycle through each edit box and place each textual content into an array.


var
  myarray : array[0..25] of string;
  i       : integer;

begin
  for i := 1 to 26 do
    begin
      myarray[i-1] := editbox+i.Text;
    end;
end.

hope this helps

regards

sxh

0
 

Expert Comment

by:krisz
ID: 1342496
The only way to access controls by index is using the form's
Controls and ControlCount property or the similar Components and
ComponentCount if the Form is not the Parent of the controls
(ie. they are on a panel).

Tip: you can use the controls' Tag property to group them.
You can set Tag in desing time.

example:

var
  Idx, i: integer;
  C: TObject;

Idx:= 0;
for i:=0 to MyForm.ComponentCount do begin
  C:= MyForm.Components[i];
  if C is TEdit then begin
    if TEdit(C).Tag= 2 then begin
      MyArray[Idx]:= TEdit(C).Text;
      inc(Idx);
    end;
  end;
end;
0
 

Expert Comment

by:rammstein
ID: 1342497
Another way :))

This routine creates Edit-fields at runtime. You can access them via edit[i].caption.
Yours, rammstein.

procedure TForm1.FormCreate(Sender: TObject);
var i: Integer;
Edit: array[1..10] of TEdit;
begin
 for i:=1 to 10 do
 begin
  edit[i]:=TEdit.Create(Application);
  with edit[i] do
   begin
   Parent:=Form1;
   Left:=10;
   Top:=i*20;
   Enabled:=TRUE;
   Visible:=TRUE;
   Width:=35;
   Height:=15;
   end;

 end;
end;

0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 

Expert Comment

by:rammstein
ID: 1342498
Another way :))

This routine creates Edit-fields at runtime. You can access them via edit[i].caption.
Yours, rammstein.

procedure TForm1.FormCreate(Sender: TObject);
var i: Integer;
Edit: array[1..10] of TEdit;
begin
 for i:=1 to 10 do
 begin
  edit[i]:=TEdit.Create(Application);
  with edit[i] do
   begin
   Parent:=Form1;
   Left:=10;
   Top:=i*20;
   Enabled:=TRUE;
   Visible:=TRUE;
   Width:=35;
   Height:=15;
   end;

 end;
end;

0
 

Expert Comment

by:rammstein
ID: 1342499
OOOOOps.. actually.. you can access these edit-boxes created at runtime via edit[i].text

Yours, rammstein
0
 
LVL 1

Expert Comment

by:sxh
ID: 1342500
here is a modified example that does away with the creation of the TObject variable. It also puts a minus 1 after the componentcount function, this is necessary as the component index is always 1 higher than the total number of components.

hope you don't mind the changes, you are quite right about the component access krisz and deserve the points.

var
  i : integer;
  MyArray : Array[0..?] of string;

begin

  for i := 0 to ComponentCount - 1 do begin
    if Components[i] is TEdit then
      begin
        if TEdit(Components[i]).Tag= i then
          begin
            MyArray[i] := TEdit(Components[i]).Text;
          end;
      end;
end;

regards

sxh
0
 

Expert Comment

by:joseramos
ID: 1342501
Yet another example ...

procedure TForm1.SaveEditText;
var
    I: Integer;
    J: Integer;
    MyArr: Array[0..26] of string;
begin
    J := 0;
   
    with (Owner as TForm) do
    begin
        for I := 0 to ComponentCount - 1 do
        begin
            if Components[I] is TEdit then
            begin
                MyArr[J] := TEdit(Components[I]).Text;
                J := J + 1;                
            end;
       end;
    end;
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to convert wav to mp3 in delphi 9 200
Machine not responding during CopyFile() 3 98
QRReport  TQrmemo vertical stretching 1 46
Delphi problems to abort a printjob 9 19
A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

778 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question