On Friday, June 5, 2015 at 1:08:37 PM UTC-7, Mat wrote:
>
> @Eric (will post separately if he doesn't see this)
>
> In hangout #85 I just noted that you, in talking about the book features,
> mention a mechanism to record the sequence in which tiddlers are *viewed
> ("it's not the history list" etc). *May I ask how this is done, briefly?
> How is a "viewing" registered?
>
I think I said it's not the $:/StoryList, which uses the "list" field to
track the currently displayed tiddlers, in the order they are *shown* in
the StoryRiver. In contrast, the $:/HistoryList uses JSON-formatted data
in the "text" field to record each time a "navigation event" occurs. This
is handled by the core and occurs automatically.
The $:/HistoryList JSON data includes not only the titles of the tiddlers,
but also other information about the rectangle used to animate the opening
of each tiddler.
Note that $:/HistoryList also contains a separate field,
{{$:/HistoryList!!current-tiddler}}, which is the title of the most
recently opened tiddler.
To get the titles from the JSON data, I wrote a custom filter, JList.js,
which allows me to write "jlist[$:/HistoryList!!title]" in a <$list>
filter. I then run that through another custom filter I wrote,
"Unique.js", to remove duplicate titles from the jlist[...] results. This
list is then displayed in a popup as the "history" of tiddlers, allowing
easy navigation back to any tiddler viewed during the session, even if it's
not currently opened.
-e
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