AutomatedLinkUpdate

[Alain Dutech]

 
Hi,

I know that TW is "non-linear" but I'd like to automate some "linearity" :o)
So, more clearly :

I have some tiddlers telling a (linear) story and I order them according to a custom field (let's call it "_date"). I'd like to have, in any of these tiddlers, a link to the preceding one and to the next one, according to the order induced by _date. How could I do this ?

I can have an ordered list of all the tidler using filters and I thought I could extract from this list the "previous" tiddler
{{{ [tag[thestory]!is[system]] +[has[_date]] +[sort[_date]] }}}

Using the "previous" operator, I thought I could extract from this the preceding tiddler and use that in a <$link> <$view> LINK </$view></$link> block. But the previous operator needs the list to be in the "ListField" of a tiddler I think.

So 1) how can I set/update the ListField of a tiddler from another tiddler macro (if I add a new tiddler between two others, I need to update this list)
     2) is there a better way to do this, I mean "how would YOU automatically update such prev/next links" ?

Thanks a lot, for the good work on TW5, but also if you hav some feedback for me :o)
Alain

[Jeremy Ruston]

Hi Alain

In 5.0.11 you'll be able to use the new before/after filter operators to do what you want. This example adapts your filter expression and then selects the tiddler after "HelloThere":

[tag[thestory]!is[system]has[_date]sort[_date]after[HelloThere]]

This example selects the tiddler before the current one:

[tag[thestory]!is[system]has[_date]sort[_date]before{!!title}]

Best wishes

Jeremy

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[Xavier Cazin]

Hi Jeremy,

Speaking of sequences, let's say I have a few titles in the list field of a ToC tiddler : [[Introduction]] [[My second chapter]] [[Here is the third one]].

I'd like to count the number of tiddlers before the current tiddler, in order to display for instance "Chapter 2 : My second chapter" from <$count filter="[all[current]operation-that-returns-the-sublist-upto-the-current-tiddler]"/>. Is there a way to achieve this from the set of operators available?

Best regards,

Xavier.

-- Xavier Cazin

[Jeremy Ruston]

Hi Xavier

Speaking of sequences, let's say I have a few titles in the list field of a ToC tiddler : [[Introduction]] [[My second chapter]] [[Here is the third one]].

I'd like to count the number of tiddlers before the current tiddler, in order to display for instance "Chapter 2 : My second chapter" from <$count filter="[all[current]operation-that-returns-the-sublist-upto-the-current-tiddler]"/>. Is there a way to achieve this from the set of operators available?

I don't think that that can be done at the moment. We'd need something like "allbefore" and "allafter" which would return all the tiddlers preceding or succeeding the tiddler named in the operand.

Best wishes

Jeremy

[Alain Dutech]

Thanks Jeremy, with the new version, it works a I intended. That's nice.

Alain

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