Try this:
Create a new tiddler (e.g., "SetPageBackground"), tagged with `
$:/tags/Stylesheet`, containing:
```
<$let curr={{$:/HistoryList!!current-tiddler}}>
body.tc-body {
background-image:url(<$macrocall $name="datauri" title={{{ [<curr>get[bg]]
}}} $output="text/plain"/>);
background-size:{{{ [<curr>get[bgsize]] }}};
}
</$let>
```
Then, in any tiddler, added a field named "bg" containing the name of an
image tiddler,
and optionally, a field named "bgsize" containing desired CSS
`background-size` attributes (e.g., "cover", "auto auto", "100% auto",
etc.). When that tiddler is navigated to (by clicking its link in the
sidebar or from another tiddler), the specfied "bg" image (and bgsize
attributes) will be applied to the `body.tc-body` background.
See https://developer.mozilla.org/en-US/docs/Web/CSS/background-size for
valid "bgsize" values.
Note for GoogleGroups: do not include the single or tripled "backticks"
when entering the tag or tiddler body text. Those are only entered here to
provide formatting for this response when displayed in
https://talk.tiddlywiki.org/
enjoy,
-e
On Thursday, February 15, 2024 at 1:37:58 PM UTC-8 pbr wrote:
> Hi Scott,
>
> For the typical end user browsing experience, I think "whichever tiddler
> is opened most recently" would work fine.
>
> I can imagine situations where a single-tiddler story would be preferable,
> but my hope is that it wouldn't be required.
>
> I'll check out talk.tiddlywiki.org and if this doesn't get traction here
> in the google group I'll follow up over there.
>
> Thank you!
> -Paul
>
>
> On Thu, Feb 15, 2024, 1:50 PM Scott Sauyet <sc...@sauyet.com> wrote:
>
>> (Note that most of the discussion for TW is being held at
>> https://talk.tiddlywiki.org/. You might get more response there.)
>>
>> One question: Are you using a story view that opens just one tiddler at
>> a time? If not, what's your expected behavior when there are multiple
>> tiddlers open with `background` images?
>>
>> On Wednesday, February 14, 2024 at 12:57:18 PM UTC-5 pbr wrote:
>>
>>> Greetings Tiddly Wickers,
>>>
>>> I want to implement something in TW and I'm not at all sure how to do it.
>>>
>>> The goal is, when a tiddler is added to the story, if it has a field
>>> "background" with the name of an image tiddler, the page background would
>>> get set to that image. Possibly another fieldwork (backgroundoptions?)
>>> could specify span, cover, scroll, and such.
>>>
>>> I had originally thought it could be done when a tiddler becomes the
>>> current tiddler, but Jeremy mentioned TW doesn't have a notion of the
>>> "current tiddler' in the sense of the tiddler that is currently being
>>> viewed. He mentioned the core Dynannotate plugin, but I'm hopeful to avoid
>>> that level of complexity.
>>>
>>> The specific trigger isn't important to me, as long as when the end user
>>> clicks around and opens tiddlers, the background can be changed on a
>>> per-tiddler basis.
>>>
>>> What do you think?
>>>
>>> Thanks!
>>> -Paul
>>>
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