Another related approach may be something discussed in recent weeks The content of the <$view> widget is displayed if the field or property is missing or empty.
So you can go ahead and display a value if its present, otherwise the content of the view widget can be used to handle its creation. https://github.com/Jermolene/TiddlyWiki5/issues/3789 Regards Tony Presently the view widget only accepts tiddler and fieldnames but I am asking it also accept variables. On Sunday, March 31, 2019 at 7:59:14 AM UTC+11, S. S. wrote: > > > 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$20%7Csort:date/tiddlywiki/Pzv5FDb9oHE/wmgNZwtWAgAJ> > > Either of the below work, and I chose the former. > filter="[enlist[$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/49f044a2-b1f3-493f-baf2-a20b8070a0e1%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
