I found a solution here: [TW5] Using conditional assignment mode of SetWidget to check empty strings <https://groups.google.com/forum/?hl=en#!searchin/tiddlywiki/macro$20empty$20parameter$20$20|sort:date/tiddlywiki/Pzv5FDb9oHE/wmgNZwtWAgAJ>
Either of the below work, and I chose the former. filter="[enlist[$tiddler$]]" filter=" $tiddler$" Regards On Saturday, March 30, 2019 at 11:17:57 PM UTC+7, S. S. wrote: > > Within a macro, I am trying to determine if a parameter is empty, and then > set a variable based on knowing that it is empty. > > I came across the Google Group post from a last month: Check the Blank > Macro parameter > <https://groups.google.com/forum/?hl=en#!topic/tiddlywiki/82N15sAnoPs/discussion> > \define mm(newField) > <$list filter="[<__newField__>] -[[]]"> > > Do my job! > </$list> > \end > > > <<mm test>> > > So I tried using something based on that. Pasting the below into a new > tiddler on tiddlywiki.com shows the issue: > > \define test(tiddler) > <$set name="result" filter="[[$tiddler$]] -[[]]" value="Why is this > variable set when the filter ''is not missing'' and ''it's empty''?"> > > The description of the ''value'' attribute of the `$set` widget says: The > value to assign to the variable if the filter is missing or ''//not > empty//'' > > tiddler=$tiddler$ > > result=<<result>> > > <$list filter="[[$tiddler$]] -[[]]" emptyMessage="See, the filter shows > it's Empty"> > </$list> > </$set> > \end > > <<test>> > > > I don't understand where I've gone wrong. I'd appreciate some advice. > Thanks. > > > -- 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/95ce429a-d80f-4e15-876b-a0ca7fcb52ef%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
