Or, to express it a different way from the subject line, how can I create a
button widget that will:
a) take the current value of a tiddler field;
b) use that current value as a parameter to a macro to calculate a new value;
and
c) put that new value back into the tiddler field that was read?
WHAT I TRIED:
I've tried various things; my most recent attempt is this:
<$button set=!!test setTo=<$macrocall $name=".js-macro-link" text={{!!test}}/>
>Test button</$button>
However, the parser can't seem to handle the angle brackets of the macrocall
widget appearing in the middle of the button widget declaration. Everything
after the "/>" that closes the macrocall widget appears as WikiText following a
blank button.
Before that I tried calling the macro through the standard syntax, and
discovered that (unless there's some way to do it that I missed) you can't use
a macro call as an element attribute.
It occurred to me that since a ButtonWidget can contain multiple ActionWidgets,
that might be the solution - except that there's nothing in the documentation
guaranteeing an order in which such widgets execute, so assigning the output of
a macro to a temporary tiddler and then copying it back to the original field
does not seem to be an option.
PLEASE NOTE:
Please note that I am trying to get an answer to the GENERAL question, not "how
do I get the same effect as if I was applying this particular macro?" I am
sure that there would be a simple way to apply the effect of THIS macro with
template transclusion, but that does not answer my question, because sooner or
later I will be using the technique for Javascript macros that do mathematical
calculations.
DOCUMENTATION SUGGESTION:
A chart which shows the various forms of data sourcing (plain text,
TextReference, macro output, etc.) in columns and then shows in rows what they
can and can't be used for (macro parameters, element attributes, etc.) would be
useful.
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