Tony You are right, see below table from : https://tiddlywiki.com/#has%20Operator
purpose filter the input by field existence input <https://tiddlywiki.com/#Filter%20Syntax> a selection of titles <https://tiddlywiki.com/#Title%20Selection> suffix <https://tiddlywiki.com/#Filter%20Step> F = NEW IN: 5.1.14 optionally, the name of a field <https://tiddlywiki.com/#TiddlerFields> parameter <https://tiddlywiki.com/#Filter%20Parameter> F = the name of a field <https://tiddlywiki.com/#TiddlerFields> output *without suffix* or with *suffix value* » those input tiddlers in which field F has a non-empty value *suffix field* » those input tiddlers in which field F exists ! output *without suffix* or with *suffix value* » those input tiddlers in which field F does *not* exist or has an empty value *suffix field* » those input tiddlers in which field F does *not* exist Cheers Mohammad On Thursday, January 10, 2019 at 11:58:04 AM UTC+3:30, TonyM wrote: > > Mohammad, > > You have answered your own question. That is the difference. Both return > nothing if a field does not exist, thus emptyValue or emptyMessage return > values. With this behaviour you can test all three posibilities. The > field[] operator is not so comprehencive. > > > I think of has[fieldname] as has value, and > has:field[fieldname] as has field or value. > > > If the fieldname does not exist neither of the above work > > > Using the Not (need to test) > > > !has[fieldname] No fieldname at all > !has:field[fieldname] No fieldname at all > > > Regards > Tony > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/9d65029c-d27b-441e-8cbe-4cd886f9310a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
