BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TDataSet.Delete Question          BorlandTalk.com Forum Index -> comp.lang.pascal.delphi.databases View previous topic :: View next topic   Author Message Chris L. Guest Posted: Fri Jan 23, 2004 7:11 pm    Post subject: TDataSet.Delete Question Hi All, I have DBGrids displaying data from TTables and TQuerys . I want to display my own exception error message when user deletes records using keystroke (Ctrl + Del). This happens when the TTable and TQuery is empty. The error message will read "TTablename: Cannot perform this operation on an empty dataset. " I want to specify the TTablename so that the message is more readily undetstood. How can I do that? Thanks. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system ([url]http://www.grisoft.com)[/url]. Version: 6.0.558 / Virus Database: 350 - Release Date: 1/2/2004 Back to top Dan Guest Posted: Fri Jan 23, 2004 8:25 pm    Post subject: Re: TDataSet.Delete Question On Fri, 23 Jan 2004 19:11:20 GMT, "Chris L." <christopher.leongc (AT) verizon (DOT) net> wrote: Quote: Hi All, I have DBGrids displaying data from TTables and TQuerys . I want to display my own exception error message when user deletes records using keystroke (Ctrl + Del). This happens when the TTable and TQuery is empty. The error message will read "TTablename: Cannot perform this operation on an empty dataset. " I want to specify the TTablename so that the message is more readily undetstood. How can I do that? Thanks. You might get what you want by setting KeyPreview for the form to true. Then, in the OnKeyDown event handler check for ctrl-del. If true, check for the grid having focus and the dataset being empty. Then show your message. Returning from the message, throw away the keystroke (Key := 0;) email me if you need a code sample. HTH, Dan Back to top Chris L. Guest Posted: Fri Jan 23, 2004 9:15 pm    Post subject: Re: TDataSet.Delete Question Dan, I apologize for not making my situation clear. I have a main form which hosts a number of TFrames. The DBGrids are in the TFrames. So, if a user presses Ctrl+Del, he'll be doing it inside a TFrame, which does not have KeyPreview property. Propergating it to the main form get a little bit complicated, because I would have to check which TFrame is visible and in focus. My TTables and TQuerys are on a TDataModule. I was hoping I can write the code to handel Ctrl+Del in the TDataModule. Would you have any suggestions? Chris "Dan" <Doculus at CMDCsystems dot com> wrote Quote: On Fri, 23 Jan 2004 19:11:20 GMT, "Chris L." [email]christopher.leongc (AT) verizon (DOT) net[/email]> wrote: Hi All, I have DBGrids displaying data from TTables and TQuerys . I want to display my own exception error message when user deletes records using keystroke (Ctrl + Del). This happens when the TTable and TQuery is empty. The error message will read "TTablename: Cannot perform this operation on an empty dataset. " I want to specify the TTablename so that the message is more readily undetstood. How can I do that? Thanks. You might get what you want by setting KeyPreview for the form to true. Then, in the OnKeyDown event handler check for ctrl-del. If true, check for the grid having focus and the dataset being empty. Then show your message. Returning from the message, throw away the keystroke (Key := 0;) email me if you need a code sample. HTH, Dan --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system ([url]http://www.grisoft.com)[/url]. Version: 6.0.558 / Virus Database: 350 - Release Date: 1/2/2004 Back to top Dan Guest Posted: Fri Jan 23, 2004 10:28 pm    Post subject: Re: TDataSet.Delete Question On Fri, 23 Jan 2004 21:15:27 GMT, "Chris L." <christopher.leongc (AT) verizon (DOT) net> wrote: Quote: Dan, I apologize for not making my situation clear. I have a main form which hosts a number of TFrames. The DBGrids are in the TFrames. So, if a user presses Ctrl+Del, he'll be doing it inside a TFrame, which does not have KeyPreview property. Propergating it to the main form get a little bit complicated, because I would have to check which TFrame is visible and in focus. My TTables and TQuerys are on a TDataModule. I was hoping I can write the code to handel Ctrl+Del in the TDataModule. Would you have any suggestions? Chris Look up TDataSet.OnDeleteError. In here you can control the error message. Set the Action to daAbort, then add your own message. if you want any. I suspect the user doesn't really need or want a popup message to have to clear. I haven't tried this, but it should be what you need. 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