Hi Jeff, Jed,
> Is it possible to get the size of a list filter into a variable?
Not currently, no. There’s an enhancement already in the 5.1.14 prerelease that
provides part of the answer: filtered transcluded attributes. These are
attributes that return the first entry of a filtered list. For example:
<div data-my-value={{{ [<currentTiddler>get[document]] }}}>
…
The other part is that we need a “count” filter operator (at the moment,
there’s only a count widget. The count filter operator would allow one to do
things like:
<table colspan={{{ [tag[special]count[]] }}}>
…
I think it’s worth adding a “count” filter; I’ve also come across cases where
it would be useful.
> The problem is that the list widget does everything. Almost every component
> of tiddlywiki that is displayed is displayed inside a list widget, from the
> order of the tiddlers in the story river to the buttons on each tiddler.
> Unfortunately this means that anything you do to the list widget has
> unintended consequences. a while ago Tobias made a modification to the list
> widget that would give you the index of the current item of the list. It was
> very useful, unfortunately it turns out that it also interferes with some of
> the optimisations needed to make tiddlywiki run reasonably.
To clarify, Jed’s referring to the fact that we can’t extend the list widget to
provide a variable with the count of the number of entries because it is
optimised to re-use the widget and DOM trees of list entries through the
insertion and deletion of entries.
> Recently there has been some more discussion about this and I think that the
> current consensus is that we should just make another widget that does what
> the list widget does but without the optimisation so we can include things
> like giving a count of the number of things in a list. I think someone said
> they would work on it but I don't know if any progress has been made.
Good idea. We need a name for the new widget; perhaps “repeat” or “loop”?
(Possibly best discussed via a GitHub ticket, if there isn’t one already)
Best wishes
Jeremy.
> On 5 Feb 2017, at 20:09, Jed Carty <[email protected]> wrote:
>
> The problem is that the list widget does everything. Almost every component
> of tiddlywiki that is displayed is displayed inside a list widget, from the
> order of the tiddlers in the story river to the buttons on each tiddler.
> Unfortunately this means that anything you do to the list widget has
> unintended consequences. a while ago Tobias made a modification to the list
> widget that would give you the index of the current item of the list. It was
> very useful, unfortunately it turns out that it also interferes with some of
> the optimisations needed to make tiddlywiki run reasonably.
>
> Recently there has been some more discussion about this and I think that the
> current consensus is that we should just make another widget that does what
> the list widget does but without the optimisation so we can include things
> like giving a count of the number of things in a list. I think someone said
> they would work on it but I don't know if any progress has been made.
>
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