On Sunday, May 8, 2016 at 2:01:07 AM UTC-7, Tobias Beer wrote:
>
> Hope I didn't get too rusty since March.
>
> I am struggling to formulate a filter logic for batch operations
> <https://groups.google.com/d/msg/tiddlywiki/hvLUL0fbxeE/E3Z5d1b7AwAJ>
> that allows to specify a filter whereas when the filter yields...
>
> - results => shows a button to delete all those tiddlers
> - no results => does not show a button since there are not tiddlers to
> be deleted
>
> The filter is specified by the user in an input field.
> Feels like a filter to model this conditional logic isn't quite there yet,
> is it?
>
> <$list filter="[foo[bar]is[emptyList]]">
> <$button>foo</$button>
> </$list>
>
> What I am *not* looking for is to just
> see if some value in a tiddler field is empty or not
> <https://github.com/Jermolene/TiddlyWiki5/pull/2186>,
> although I am not sure that that would exist either (in a simple solution).
>
To conditionalize output based the empty/non-empty state of the filter
results, use the *emptyMessage* param in the $list widget.
To make things more readable, I tend to put the output rendering code into
separate macros, thus:
\define showitem() <$button>{{!!title}}</$button>
\define showempty() no items
\define filter() [foo[bar]]
<$list filter=<<filter>> emptyMessage=<<showempty>>> <<showitem>> </$list>
enjoy,
-e
P.S. welcome back
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