[all[current]backlinks[]] should do the trick. The $list widget will display its contents if and only if there are results in the filter, so in this case you get nothing if there are no backlinks.
If you're not sure where backlinks[] comes from, the filter operators <https://tiddlywiki.com/#Filter Operators> tiddler in the documentation is a great reference. On Wednesday, May 13, 2020 at 6:22:58 AM UTC-5, yrosgi L wrote: > > Hi, Eric. May I ask one more detail about the $list filter that how to > check whether a tiddler has backlinks? > > Thanks > > 在 2020年5月12日星期二 UTC+8上午9:37:47，Eric Shulman写道： >> >> On Monday, May 11, 2020 at 5:51:14 PM UTC-7, yrosgi L wrote: >>> >>> I have tried to add the source field to the view template with following >>> text: >>> >>>> source: {{!!source}} >>>> >>> when the source field is empty, it just display "source:" at the bottom. >>> I hope that the snippet above only display while source field is no >>> empty. >>> >> >> There are several ways to test to see if there is a source field. Here's >> one: >> >> <$list filter="[<currentTiddler>has[source]]"> >> source: {{!!source}} >> </$list> >> >> The has[...] filter checks to see if the specified field is *non-empty*. >> If the field does not exist or is empty, the body of the $list widget is >> completely skipped. Thus, the "source:" label is only displayed when there >> is an actual value to show. >> >> enjoy, >> -e >> Eric Shulman >> TiddlyTools.com: "Small Tools for Big Ideas!" (tm) >> InsideTiddlyWiki - http://TiddlyTools.com/InsideTW >> > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/f5646211-4cab-4c9d-b997-5fce232faa47%40googlegroups.com.
