Wrap the image part in a <$list> widget that tests whether isbn is blank. You can use the emptyMessage attribute to show the plain URL instead when there is no isbn.
On Sunday, January 3, 2021 at 4:10:44 PM UTC+1 [email protected] wrote: > Yes, but I need a plain URL, not an image link, so wouldn't be able to use > <$image ... > > On Sunday, January 3, 2021 at 9:08:08 AM UTC-6 [email protected] wrote: > >> The last example does that, it falls back to an entirely different URL if >> no ISBN fields exist. >> >> On Sunday, January 3, 2021 at 3:59:03 PM UTC+1 [email protected] wrote: >> >>> This looks nice! It appears to put all the right code in the right >>> place. Now if only librarything servers would quit dying on me... >>> >>> Are there any other widgets with :filter and :else options that I could >>> use to do something similar w/ a link? Specifically, use isbn or isbn13 in >>> link, but if they don't exist show this *other* link? I've been using [ext[ >>> link format, but need to do some if/then... >>> >>> On Sunday, January 3, 2021 at 8:38:38 AM UTC-6 [email protected] wrote: >>> >>>> Here is an example on falling back to the generic image if no ISBN >>>> fields are defined >>>> >>>> \define makeimg() >>>> <$vars isbn={{{[{!!isbn}!is[blank]else{!!isbn13}]}}}> >>>> <$image source={{{ [[ >>>> http://covers.librarything.com/devkey/dev-key-goes-here/medium/isbn/]addsuffix<isbn>] >>>> >>>> :filter[<isbn>!is[blank]] :else[[generic image URL]] }}}/> >>>> </$vars> >>>> \end >>>> >>>> <<makeimg>> >>>> >>> -- 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/d837d5ea-0fd5-49e2-9dad-aba007264736n%40googlegroups.com.
