try this: DBCheckBox4.Enabled := not DBEdit2.Field.IsNull;
2010/4/27 Bob Pawley <rjpaw...@shaw.ca> > Hi > > The following works well and it is simple enough that I can almost > understand it. > > Thanks everyone. > > Bob > > if DBEdit2.Text <> '' then > DBCheckBox4.Enabled := true > else > DBCheckBox4.Enabled := false > > ----- Original Message ----- > *From:* Colin Johnsun <colin.a...@gmail.com> > *To:* NZ Borland Developers Group - Delphi List <delphi@delphi.org.nz> > *Sent:* Monday, April 26, 2010 5:53 PM > *Subject:* Re: [DUG] Enable CheckBox > > Yeah, that was my thinking on the topic too! But you said it much better :) > > > BTW, I'm wondering if Bob, the originator of this thread, wants to chime in > and let us know if any of these suggestions helped or not. > > On 27 April 2010 10:34, Jolyon Smith <jsm...@deltics.co.nz> wrote: > >> Maybe it’s just me, but “A doesn’t equal B” surely reads more closely to >> the *real meaning* than “not (A does equal B)”. >> >> >> >> Apart from anything else, the latter *requires* parentheses to avoid the >> compiler getting confused and trying to do : “(Not A) equals (B)”. i.e. the >> latter syntax is also to the compiler less close to the real meaning (since >> it requires disambiguation). >> >> >> >> From a human perspective the scanning is more fluid: A <> B, reads left >> to right entirely as intended: “A does not equal B”. >> >> >> >> NOT (A = B) on the other hand requires me to read it like a syntax tree >> parser: “NOT “ … (OK, store the fact that I have to logically invert what >> follows, keep a mental note of parentheses) … then what follows is “( A is >> equal to B )” , right OK, so “A is equal to B inverted”, i.e. A does not >> equal B. >> >> >> >> In other words, exactly what is menat literally and clearly when I write… >> A <> B. >> >> >> >> But as I say, maybe it’s just me. >> >> >> >> NOT (I think like a computer). >> >> >> >> ;) >> >> >> ------------------------------ > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: delphi@delphi.org.nz > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: > unsubscribe > > > _______________________________________________ > NZ Borland Developers Group - Delphi mailing list > Post: delphi@delphi.org.nz > Admin: http://delphi.org.nz/mailman/listinfo/delphi > Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: > unsubscribe >
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