The $subfilter attribute expects some type of *filter* to be handed to it.
Unless your user types in an actual filter phrase,
{{$:/state/new-button-caption}} won't work.
The filter string syntax allows transclusions inside the string with a
single set of curly braces. So this:
subfilter="[{$:/state/new-button-caption}]"
means take the value inside of $:/state/new-button-caption and insert it
(transclude it) between the square brackets as though it were in-lined with
it's own square brackets. So if tiddler $:/state/new-button-caption
contained "My Exciting Tiddler" then the filter would see:
subfilter="[[My Exciting Tiddler]]"
which is also the same as
subfilter="[title[My Exciting Tiddler]]"
HTH
-- Mark
On Monday, October 22, 2018 at 2:22:09 PM UTC-7, Rollo ro wrote:
>
> Hi,
>
> @Mark: I spent countless hours with reading the documentation and trying
> to get the correct expression without success, and could finally get my
> code working after reading your post. Thanks for that!
>
>
> I wanted to use
>
> <$action-listops $subfilter={{$:/state/new-button-caption}}
> $field="myfieldoftitles"/>
>
> to add an title which was typed in a text box. This failed for titles with
> spaces and I could not figure out how to get the [[ brackets without
> requiring the user to type it. Now I found that it works with
>
> <$action-listops $subfilter="[{$:/state/new-button-caption}]"
> $field="myfieldoftitles"/>
>
> This is much like what Mark posted. I just had to remove !! to be able to
> access my variable. This is what I understand, but I don't understand the
> rest of the syntax at all. I'd appretiate if someone could explain what the
> code actually means. Or how it is interpreted.
>
>
>
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