Hello,
What I've found so far is:
1) Macros and widgets may look something like javascript functions and
variables, but they often behave differently
2) You can't use a widget's output inside a widget
3) You can use a macro inside a widget IF it doesn't have a parameter
4) Therefore, you will most often need to use <$set ...> to set a variable
to be used by a macro that gets fed to your widget
Mark
On Saturday, October 3, 2015 at 10:49:00 AM UTC-7, Antaeus Feldspar wrote:
>
> Or, to express it a different way from the subject line, how can I create
> a button widget that will:
> a) take the current value of a tiddler field;
> b) use that current value as a parameter to a macro to calculate a new
> value; and
> c) put that new value back into the tiddler field that was read?
>
> WHAT I TRIED:
>
> I've tried various things; my most recent attempt is this:
>
> <$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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