The set widget is very useful for choosing between multiple options. Understanding the logic of what combinations of the $set widget's attributes produce the desired outcome is essential to using it for such a requirement. The discussion above was quite a revelation.
Here's a possible use.
If A is not empty, chose A
If A is empty, chose B
If B is empty, chose C
If C is empty, chose D
A real case secenario occurred within the date() macro
<https://groups.google.com/forum/?hl=en#!topic/tiddlywiki/_bbDpiiReic>:
In the macro, I wanted to choose a template based on:
If there is a *template-day* parameter ( *$template-day$* )
Use that
If NO *template-day* parameter
Use the *template* parameter ( *$template$* )
If NO *template* parameter
Use the *Custom Settings* field value (stored in tiddler:
*date-settings-tiddler* field: *template-day* )
If NO *Custom Settings*
Use the template *default variable* ( *<<template-day-default>>*
)
<$set name="temp" tiddler="date-settings-tiddler" field="template-day"
emptyValue=<<template-day-default>>>
<$set name="temp-template" filter="[enlist[$template$]]"
value="$template$" emptyValue=<<temp>>>
<$set name="template" filter="[enlist[$template-day$]]"
value="$template-day$" emptyValue=<<temp-template>>>
Code using <<template>>
</$set>
</$set>
</$set>
Note how the $set flow is an exact reverse of the logical requirement,
where the most important variable ( *template-day* ) is tested last.
So, for those interested, attached is a: Set Widget Tester for attribute
precedence tiddler.
Drag & drop it into your TiddlyWiki or tiddlywiki.com & hopefully quickly
check the result of any combination of the set widget's parameters.
Regards.
On Monday, April 1, 2019 at 10:26:24 PM UTC+7, Jeremy Ruston wrote:
>
> Hi SS
>
> That’s great, thank you.
>
> > Testting shows: If there is a value attribute & no emptyValue attribute,
> the value is returned irrespective of the filter's result.
>
> I can confirm that behaviour, and I think it’s a bug. But… I’m not 100%
> sure that we should fix it; it might be better just to revise the docs at
> this point (the observed behaviour is simpler to describe in the docs).
>
> Best wishes
>
> Jeremy
>
>
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Set Widget Tester for attribute precedence.tid
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