/Delphi/How to validate if the text in edit has numbers in and to show a message if it has in delphi

How to validate if the text in edit has numbers in and to show a message if it has in delphi

// Taking OP question obsessively literally, this 
// function doesn't allow negative sign, decimals, or anything
// but digits
function IsValidEntry(s:String):Boolean;
var
  n:Integer;
begin
  result := true;
  for n := 1 to Length(s) do begin
    if (s[n] < '0') or (s[n] > '9') then
    begin
       result := false;
       exit;
    end;
  end;
end;

Source: stackoverflow.com

Similar codes

0 vote274 views1 answer
Shuffle array delphi
Delphi
2 votes317 views1 answer
Get last element of array delphi
Delphi
0 vote262 views1 answer
Get time in milliseconds delphi
Delphi
3 votes242 views1 answer
Flash messages using boot strap
Delphi
1 vote316 views3 answers
Bootstrap cards with image on the right side
Delphi
19 votes302 views2 answers
Download jupyter for linux
Delphi
0 vote240 views1 answer
Choose character from string in delphi
Delphi
0 vote299 views1 answer
Breakpoint condition delphi
Delphi
0 vote253 views1 answer
Types of message box C#
Delphi
6 votes286 views3 answers
How to install pip in python 3.9 windows 10
Delphi