Thank you very much for your help! I guess I need to give up on this particular idea. There are only so many hours I can spend struggling with something like this before I am simply ready to ditch TiddlyWiki altogether. I really struggle with the syntax. Depending on the context, I may need one, two or three curly braces, or maybe '<' - or maybe '<<' - and I can't find any rhyme or reason for these contexts. The documents seem to be written for someone familiar with multiple programming languages. That's not me.
I just need a simple if/then/else and that seems to require a lot of strange workarounds. I guess I'll look for that elsewhere... On Sunday, January 3, 2021 at 11:20:57 AM UTC-6 [email protected] wrote: > 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/f824f9cf-834d-4364-92f5-659c91892291n%40googlegroups.com.
