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Pascal/Delphi Source File  |  1995-08-19  |  2KB  |  66 lines
  1. unit Valid_u;
  2.  
  3. interface
  4.  
  5. uses
  6.   SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  7.   Forms, Dialogs, DBTables, DB, ExtCtrls, DBCtrls, Grids, DBGrids, StdCtrls;
  8.  
  9. type
  10.   TForm1 = class(TForm)
  11.     Table1: TTable;
  12.     DataSource1: TDataSource;
  13.     DBGrid1: TDBGrid;
  14.     DBNavigator1: TDBNavigator;
  15.     Table1VendorNo: TFloatField;
  16.     Table1VendorName: TStringField;
  17.     Table1Address1: TStringField;
  18.     Table1Address2: TStringField;
  19.     Table1City: TStringField;
  20.     Table1State: TStringField;
  21.     Table1Zip: TStringField;
  22.     Table1Country: TStringField;
  23.     Table1Phone: TStringField;
  24.     Table1FAX: TStringField;
  25.     Table1Preferred: TBooleanField;
  26.     procedure Table1VendorNoValidate(Sender: TField);
  27.     procedure Table1BeforePost(DataSet: TDataset);
  28.     procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
  29.   private
  30.     { Private declarations }
  31.   public
  32.     { Public declarations }
  33.   end;
  34.  
  35. var
  36.   Form1: TForm1;
  37.  
  38. implementation
  39.  
  40. {$R *.DFM}
  41.  
  42. procedure TForm1.Table1VendorNoValidate(Sender: TField);
  43. begin
  44.   if Table1VendorNo.Value < 1 then
  45.     raise Exception.Create('Positive Vendor number required');
  46. end;
  47.  
  48. procedure TForm1.Table1BeforePost(DataSet: TDataset);
  49. begin
  50.   if (Table1Address1.Value = '')  and
  51.      (Table1Address2.Value <> '') then
  52.     begin
  53.       MessageDlg('Address1 cannot be blank',mtError,[mbOK],0);
  54.       Abort;
  55.     end;
  56. end;
  57.  
  58. procedure TForm1.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
  59. begin
  60.   if MessageDlg('Close this form',mtConfirmation,
  61.                 [mbYes,mbCancel],0) <> mrYes then
  62.     CanClose := False;
  63. end;
  64.  
  65. end.
  66.