Thank you guys, this has been a real education. I have taken Jeremy's code
and have tried to expand it to create a button that when clicked brings up
an enlarged image, however the image in the popup is very narrow?
\define image(tiddler)
<$button class="tc-btn-invisible tc-thumbnail-image"
popup="$:/popupstatus/$tiddler$">
<$tiddler tiddler=<<__tiddler__>>>
<$image source={{!!title}} width=80 tooltip={{!!caption}}/>
</$tiddler>
</$button>
<$reveal type="popup" state="$:/popupstatus/$tiddler$">
<div class="tc-drop-down">
<$tiddler tiddler=<<__tiddler__>>>
Bigger Picture
<$image source={{!!title}} width=800 height=700
tooltip={{!!caption}}/>
</$tiddler>
\end
<<image "Motovun Jack.jpg">>
On Tuesday, 7 August 2018 15:23:59 UTC+1, Jeremy Ruston wrote:
>
> I hadn't thought to think of the underscores as brackets, but that might
> be useful.
>
> Best wishes
>
> Jeremy
>
> --
> Jeremy Ruston
> jer...@jermolene.com <javascript:>
> https://jermolene.com
>
> On 7 Aug 2018, at 15:00, @TiddlyTweeter <tiddly...@assays.tv <javascript:>>
> wrote:
>
> Thank you Jeremy
>
> Would it be OK to call __underscore brackets__ "sub-bracketing?"
>
> What I mean is that it needs the "<" "<<" contexts to function, so its a
> subsidiary construct?
>
> Best wishes
> Josiah
>
> On Tuesday, 7 August 2018 15:24:57 UTC+2, Jeremy Ruston wrote:
>>
>> The one thing that I'd like to know is whether, in all contexts, you
>> need __underscore brackets__ to be "bracketed", i.e. does this
>> construct always have to have "<<" or "<" etc. around it?
>>
>>
>> Yes, a construction involving either << or < is needed to use any
>> variable.
>>
>> The parameter name wrapped in double underscores is a valid variable name
>> in its own right. When used in a filter it wouldn't have the double angle
>> brackets:
>>
>> <<link-links "[tag<__tagname__>!sort[modified]]">>
>>
>> To put it another way: macro parameters are made available within the
>> body of a macro as variables named with the parameter name wrapped in
>> double underscores.
>>
>> Best wishes
>>
>> Jeremy.
>>
>>
>>
>> Jeremy Ruston wrote:
>>
>>> The feature was new in 5.1.16:
>>>
>>> https://tiddlywiki.com/#Macro%20Definitions%20in%20WikiText
>>>
>>> Parameters as Variables
>>>
>>> --
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