Evan, Mate, as we say in Australia,
*I have never being so happy finding someone with the same problems.*
Detects if field exists AND has Value
The below tests all worked for me,
Test 1
<$if value={{!!item-started}}>
item-started is set to {{!!item-started}}
</$if>
<$else>
No item-started set
</$else>
Test 2
Above in macro
Test 3
Attempt to pass field name rather than field contents to a macro
I can test with
<$set name=testdate value=(={{!!$datefield$}}=)>
<$if value=<<testdate>> >
body of macro
</$if>
</$set>
\end
I suppose I should be careful building this into a solution at this point.
But thanks so much.
Tony
On Saturday, 30 December 2017 18:08:49 UTC+11, Evan Balster wrote:
>
> Hey, Simon —
>
> with your additions you're addressing lots of problems I'm facing right
>> now. Thanks for your efforts and contributions!
>
>
> I'm solving similar problems. :) Happy to share.
>
> I'd very much like to see this in the core, is there a chance?
>>
>
> That comes down to how TiddlyWiki's architects feel about it. Previous
> discussions about $if widgets like the one here concluded that they would
> likely be redundant with $reveal. For my part, though, I see $if playing a
> fairly different role: Lightweight, value-oriented and $list-like as
> compared to the feature-rich, state-oriented $reveal widget... The $else
> widget is something else entirely, with its unusual sibling-based behavior.
>
> Anyway, I'll be interested to see how this flies with Jeremy and the
> others. Keep an eye out for bugs.
>
> On Saturday, 30 December 2017 01:02:05 UTC-6, BurningTreeC wrote:
>>
>> Hello Evan,
>>
>> This is *great*,
>> with your additions you're addressing lots of problems I'm facing right
>> now
>>
>> Thanks for your efforts and contributions!
>>
>> I'd very much like to see this in the core, is there a chance?
>>
>> kind regards,
>> Simon
>>
>> Am Samstag, 30. Dezember 2017 06:54:54 UTC+1 schrieb Evan Balster:
>>>
>>> Introducing the *condition* plugin. (Version 0.1 attached, docs
>>> included)
>>>
>>> It provides *$if*, *$else* and *$else-if* widgets that choose whether
>>> to show or hide their contents based on simple text conditions. It pairs
>>> well with my formula plugin
>>> <http://evanbalster.com/tiddlywiki/formulas.html> and its default
>>> "truthy" conditions handle boolean values.
>>>
>>> As compared with the closely-related *$reveal* widget, conditions are
>>> simpler, behave more like *$list*, and can be executed as a chain.
>>> They don't retain contents or animate, and can be based on variables,
>>> filtered or transcluded attributes rather than just state tiddlers.
>>>
>>> The *$else* and *$else-if* widgets have some special uses, depending on
>>> what they're placed after...
>>>
>>> - After a* $list* widget, it will display when the list is empty.
>>> - After a *$reveal* widget, it will display when the former's
>>> contents are hidden.
>>> - After an *$if* or *$else-if*, it will display only when earlier
>>> conditions were all false.
>>>
>>> This was a quick evening project, so it could have bugs. Please test
>>> and remark here if you find any issues. Future versions will probably live
>>> in the Formulas project.
>>>
>>
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