Search results for 'Comma Separator'. 1 post(s) found.
- 2007/08/25 How To Force The Correct Decimal Separator
Some English speaking countries use the "point" as Decimal Separator, while the rest of the world is using the "Comma". How can you make sure that the user will press the correct key when entering a number with a decimal fraction? With the code in this examples, it doesn't matter!
// Correct the Decimal Separator
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
// Delphi automatically sets DecimalSeparator (a global
// variable) to Windows' Decimal Separator
if Key in ['.', ','] then
Key := DecimalSeparator;
end;
// This is a more complete procedure:
// it allows only valid numbers and
// it corrects the Decimal Separator.
// For educational purposes 8-)
// the code is very detailed.
procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
type
TErrNum = (eNone, eInvalidKey, eTooManySeps, eTooManySigns, eSignPos);
const
ErrMessages : array[eInvalidKey..eSignPos] of string = (
'Invalid key',
'Only one Decimal Separator is allowed',
'Only one sign is allowed',
'A sign is only allowed in the first position');
Signs = ['+', '-'];
Nums = ['0'..'9'];
DecSeps = ['.', ','];
Backspace = [#8];
ValidKeys = Signs + Nums + DecSeps + Backspace;
var
ErrNum: TErrNum;
begin
ErrNum := eNone;
if not (Key in ValidKeys) then
ErrNum := eInvalidKey
else if Key in DecSeps then begin
Key := DecimalSeparator;
if Pos(Key, Edit2.Text) > 0 then
ErrNum := eTooManySeps;
end
else if Key in Signs then begin
if Pos('+', Edit2.Text) + Pos('-', Edit2.Text) > 0 then
ErrNum := eTooManySigns
else if Edit2.SelStart <> 0 then
ErrNum := eSignPos;
end;
if ErrNum <> eNone then begin
Key := #0; // nothing is passed to the Edit
MessageDlg(ErrMessages[ErrNum], mtWarning, [mbOk], 0);
end;
end;
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
// Delphi automatically sets DecimalSeparator (a global
// variable) to Windows' Decimal Separator
if Key in ['.', ','] then
Key := DecimalSeparator;
end;
// This is a more complete procedure:
// it allows only valid numbers and
// it corrects the Decimal Separator.
// For educational purposes 8-)
// the code is very detailed.
procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
type
TErrNum = (eNone, eInvalidKey, eTooManySeps, eTooManySigns, eSignPos);
const
ErrMessages : array[eInvalidKey..eSignPos] of string = (
'Invalid key',
'Only one Decimal Separator is allowed',
'Only one sign is allowed',
'A sign is only allowed in the first position');
Signs = ['+', '-'];
Nums = ['0'..'9'];
DecSeps = ['.', ','];
Backspace = [#8];
ValidKeys = Signs + Nums + DecSeps + Backspace;
var
ErrNum: TErrNum;
begin
ErrNum := eNone;
if not (Key in ValidKeys) then
ErrNum := eInvalidKey
else if Key in DecSeps then begin
Key := DecimalSeparator;
if Pos(Key, Edit2.Text) > 0 then
ErrNum := eTooManySeps;
end
else if Key in Signs then begin
if Pos('+', Edit2.Text) + Pos('-', Edit2.Text) > 0 then
ErrNum := eTooManySigns
else if Edit2.SelStart <> 0 then
ErrNum := eSignPos;
end;
if ErrNum <> eNone then begin
Key := #0; // nothing is passed to the Edit
MessageDlg(ErrMessages[ErrNum], mtWarning, [mbOk], 0);
end;
end;
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