Mohammadd,
I just saw this now. The Count operator or count widget, with an allbefore
can be used to count the items before a position in a list to get the N for
the Nth.
[{!!list}allbefore[string]count[]] or something similar. add[1] if needed.
Tones
On Tuesday, 23 March 2021 at 22:16:08 UTC+11 Mohamed Amin wrote:
> Thanks @Mat this is a clever workaround solution.
>
> @Tones, thanks for your reply, but I couldn't get your idea, how can I use
> "range operator" to calculate the number "N" that I'll use in the "nth[N]"
> operator?
>
>
> On Tuesday, March 23, 2021 at 12:34:00 PM UTC+2 TW Tones wrote:
>
>> Mats suggestion is one I use.
>>
>> Another trick is to use count to get the total number T of items then use
>> a range operator from 1 to N, in which the current tiddler will be the item
>> number.
>>
>> However you then need to retrieve the nth[N] item from the list.
>>
>> Regards
>> Tones
>>
>> On Tuesday, 23 March 2021 at 21:24:41 UTC+11 Mat wrote:
>>
>>> You can use this to find the position of an item in a list
>>>
>>> +[allbefore<item>count[]add[1]]
>>>
>>> e.g
>>>
>>> {{{ one two three four five +[allbefore[four]count[]add[1]] }}} ----> 4
>>>
>>> Not sure it's the optimal solution, I just made it up.
>>>
>>> <:-)
>>>
>>>
>>>
>>> On Tuesday, March 23, 2021 at 10:57:48 AM UTC+1 Mohamed Amin wrote:
>>>
>>>> Hi,
>>>>
>>>> Is there a way to get the position of an item in a "list field"?
>>>>
>>>> More info:
>>>> Recently I've discovered the "nth" filter operator
>>>> <https://tiddlywiki.com/#nth%20Operator>, and one of the use case I
>>>> immediately think about was to "iterate" through items in multiple related
>>>> "list fields"
>>>>
>>>> Take the following example (not a real one, just to get the idea clear):
>>>> If a family needs to manage its friends, each family member's Tiddler
>>>> will have the following fields:
>>>> 1- friend-names : "list field" contains ALL friends
>>>> 2- friendships-start-date : "list field" where the "position" of the
>>>> date determine the friend's names
>>>> 3- friendships-meter : "list field" where the "position" of the %
>>>> determine the friend's names
>>>>
>>>> Ex.
>>>> friend-names : [[alex]] [[andy]] [[john]]
>>>> [[evan]]
>>>> friendships-start-date : [[Mar2015]] [[Dec2017]] [[Nov2016]]
>>>> [[Feb2011]]
>>>> friendships-meter [[70]] [[30]] [[60]]
>>>> [[90]]
>>>>
>>>> Now I can use the filter "[contain:friend-name[alex]]" to get all
>>>> family members who is a friend with "alex".
>>>> And if I know the <<position>> of "alex" in the "friend-names" field,
>>>> I can get the rest of the data corresponding to it for the currentTiddler
>>>> using a filter like:
>>>> "[all[current]get[friendships-meter]enlist-input[]nth<position>]"
>>>>
>>>> Regards
>>>>
>>>>
--
You received this message because you are subscribed to the Google Groups
"TiddlyWiki" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/tiddlywiki/025a455d-f8ec-4ee1-b7a1-230b6aeacbb3n%40googlegroups.com.
