On Monday, May 29, 2017 at 1:33:16 PM UTC+2, Julian Kniephoff wrote:
>
> On Monday, May 29, 2017 at 12:08:13 PM UTC+2, Ton Gerner wrote:
>>
>> @Julian
>>
>> Create a tiddler which contains:
>>
>> {{!!title}}
>>
>> {{!!draft.of}}
>>
>> {{!!draft.title}}
>>
>> In edit mode with preview mode enabled you see that `{{!!draft.of}}` and
>> `{{!!draft.title}}` behave the same.
>>
>> But - still in edit mode - change the title of that tiddler. Only
>> `{{!!draft.title}}` follows the change! Why?
>>
>
> That is exactly what I meant. draft.of contains the original title of the
> tiddler that is being edited; i.e. the name the tiddler had when you click
> the edit button, even if you change the title during editing. draft.title
> contains
> the title that the tiddler should get after editing. When you just pressed
> the edit button, this coincides with draft.of, because you haven't
> changed the title yet, but when you do, draft.title updates.
>
You are exactly right!
> Now I am not that familiar with TiddlyWikis editing lifecycle internals,
> yet, but I presume that both are needed at the moment you save the tiddler.
>
right. .. Internally the tidders are immutable. That means eg: plugin
authors have to use the core function $tw.wiki.addTiddler() or
$tw.wiki.deleteTiddler() and so on. Using those functions is necessary,
because changing tiddlers also needs to trigger a UI refresh, if the edited
tiddler is visible at the moment.
So as soon as you change the content of a tiddler it will be refreshed.
That's the main reason, why $edit-widget in view mode causes problems.
Since as soon as you change a single character it will be refreshed and the
"edit-widget" looses focus. ... That's a famous newbee trap!
> You want to be able to reference the original tiddler, for example to
> potentially delete it when you changed the title,
>
exactly
> or to write the new values of the draft tiddler back to it if you didn't.
>
If tiddler content is overwritten, you actually create a new one with the
same name which overwrites the old one in the internal memory. ... But
directly editing the internal memory with eg: plugins is not possible since
tiddlers are immutable there.
> Also, if you changed the title, you of course need to be able to reference
> that, to actually create the new tiddler.
>
right. you also need to send a "delete request" with the old name, and a
"create request" with the new name, to a server, if you run in client -
server mode.
have fun!
mario
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