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TEdit Numerical Input Only

VB icon
Submitted on: 12/3/2003 12:38:35 AM
By: Orlando Juriq 
Level: Beginner
User Rating: Unrated
Compatibility:Delphi 7, Delphi 6, Delphi 5, Delphi 4, Pre Delphi 4

Users have accessed this code 437 times.
     Limits the input of a TEdit to numerical strings only by discarding the "invalid" characters in its OnKeyPress event handler
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Terms of Agreement:   
By using this code, you agree to the following terms...   
1) You may use this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.   
2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.   
3) You may link to this code from another website, but ONLY if it is not wrapped in a frame. 
4) You will abide by any additional copyright restrictions which the author may have placed in the code or code's description.

    ! Name: TEdit Numerical Input Only
    ! Description:Limits the input of a TEdi
    !     t to numerical strings only by discardin
    !     g the "invalid" characters in its OnKeyP
    !     ress event handler
    ! By: Orlando Juriq
    !This code is copyrighted and has    ! limited warranties.Please see http://w
    !     ww.Planet-Source-Code.com/vb/scripts/Sho
    !     wCode.asp?txtCodeId=1286&lngWId;=7    !for details.    !**************************************
    procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
    if not (Key in [#8, '0'..'9', '-', DecimalSeparator]) then
    ShowMessage('Invalid key: ' + Key);
    Key := #0;
    else if ((Key = DecimalSeparator) or (Key = '-')) and 
    (Pos(Key, (Sender as TEdit).Text) > 0) then begin
    ShowMessage('Invalid Key: twice ' + Key);
    Key := #0;
    else if (Key = '-') and 
    ((Sender as TEdit).SelStart <> 0) then begin
    ShowMessage('Only allowed at beginning of number: ' + Key);
    Key := #0;

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