Thanks, but I've moved my book collection back online to LibraryThings. On Monday, January 4, 2021 at 5:10:46 AM UTC-6 amreus wrote:
> Hopefully this is helpful. I also find the syntax arcane and still > struggle with constructing code like the following. > > \define makeimg() > <$vars > imgurl="http://covers.librarything.com/devkey/dev-key/medium/isbn/"; > fallback="[[Normal Link|http://google.com]]"; > isbn={{{[{!!isbn}!is[blank]else{!!isbn13}]}}} > > > <$list filter=<<isbn>> emptyMessage=<<fallback>>> > <$image source={{{[<imgurl>addsuffix<isbn>]}}}/> > </$list> > </$vars> > \end > > <<makeimg>> > > > On Sunday, January 3, 2021 at 2:39:18 PM UTC-5 [email protected] wrote: > >> Thank you very much for your help! >> >> I guess I need to give up on this particular idea. There are only so many >> hours I can spend struggling with something like this before I am simply >> ready to ditch TiddlyWiki altogether. I really struggle with the syntax. >> Depending on the context, I may need one, two or three curly braces, or >> maybe '<' - or maybe '<<' - and I can't find any rhyme or reason for these >> contexts. The documents seem to be written for someone familiar with >> multiple programming languages. That's not me. >> >> I just need a simple if/then/else and that seems to require a lot of >> strange workarounds. I guess I'll look for that elsewhere... >> >> On Sunday, January 3, 2021 at 11:20:57 AM UTC-6 [email protected] wrote: >> >>> Wrap the image part in a <$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/51f5e342-1e03-4f8f-802d-9d5326603c77n%40googlegroups.com.
