vpl,
First of all, the syntax for incorporating a variable into a filter
expression is not <<variable>> but <variable>:
\define test_project() {{{ [<my_tiddler>get[projectId]] }}}
However, this still may not work, depending on how you use the macro. It's
tempting to think of macro transclusions as "function calls", where when
you say <<test_project>> you get the result of evaluating their contents as
wikitext. But this is not how macros work – instead, *the exact text of the
macro* (with any $text substitutions$ the macro might include) is inserted
wherever the <<macro transclusion>> is used, which in this case is a filter
expression in triple curly braces.
Now, this will still work fine if you just say, for instance:
<<test_project>>
In this case, TW replaces <<test_project>> with {{{
[<my_tiddler>get[projectId]] }}}, then sees that wikitext in the body of a
tiddler, evaluates it, and gets the project ID. But it won't work if you
try to use it within another filter expression, or as the value of an HTML
or widget attribute, e.g., suppose you had a tiddler whose title was this
project ID and wanted to transclude it:
<$transclude tiddler=<<test_project>>/>
In this case, TW will be looking for a tiddler called "{{{
[<my_tiddler>get[projectId]] }}}", and it presumably won't find it.
If you need to, you can get around this with the $wikify widget:
<$wikify name="myProjectId" text=<<test_project>>>
<$transclude tiddler="myProjectId"/>
</$wikify>
In this case, you explicitly tell TW to evaluate the wikitext "{{{
[<my_tiddler>get[projectId]] }}}", then use the result to transclude the
appropriate tiddler.
You can read more on this in the Wikification section
<https://groktiddlywiki.com/read/#Wikification> of *Grok TiddlyWiki*.
On Tuesday, August 17, 2021 at 9:56:51 AM UTC-5 vpl wrote:
> Hi,
>
> I want to define a global variable in my script with the value contained
> into a tiddler field
> When I hard code the global variable like
>
> \define test_project() project-1
>
> I can use the <<test_project>> variable without issue
>
> But when I want this <<test_project>> to be initialised to a tiddler's
> field like the following this does not work
>
> \define test_project() {{{ [<<my_tiddler>>get[projectId]] }}}
>
> Any "magic" idea ..??
>
> Thanks a lot for your support
>
> Regards vpl
>
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