Selecting values from a data tiddler

#1

Hi folks!

I am stuck with something which is probably obvious if you know how …

<$select tiddler='mywotd'>
<$list filter='[[wotd]indexes[]]'>
<option value='[[wotd]getindex<title>]'><$view field='title'/></option>
</$list>
</$select>

{{mywotd}}

I would like to show the definition of a word after selecting it from a dropdown list. I have the list but the definition does not appear in “mywotd” - instead it shows:

[[wotd]getindex

Thanks

M

#2

To get the index value, use a “filtered transclusion” as the parameter, like this:

<option value={{{ [[wotd]getindex{!!title}] }}}>

-e

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#3

I may need to rethink my approach here but is there a way to append text to the expression:

<option value={{{ [[wotd]getindex{!!title}] }}}>

What I would really like to write to the “mywotd” tiddler is:

My word for today is {WORD} meaning {DEFINITION}.

I can then paste this to Bluesky, X etc.

Many thanks

M

#4

This should do it:

<option value={{{ 
	[[My word for today is "]]
	[{!!title}]
	[[" meaning "]]
	[[wotd]getindex{!!title}]
	[[".]] 
	+[join[]] 
}}}><$view field='title'/></option>

Remove the quotes if you don’t want them. And format this as you choose as a single line or as multi-line like I did.

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#5

If you find the filter syntax difficult to read, you can also do the same thing a bit more legibly with a substituted attribute value:

<option value=`My word for today is "${ [{!!title}] }$" meaning "${ [[wotd]getindex{!!title}] }$".`>
<$view field=title />
</option>

Within the backticks (not quote marks!) that indicate the substitution syntax, anything wrapped in ${ }$ will be evaluated as a filter, anything in $(variable)$ format will be replaced with the value of the corresponding <<variable>>, and anything else will be preserved as a literal string — including any spaces. This lets us omit the brackets and the +[join[]] step necessary in the filtered transclusion.

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#6

Yes, that’s much nicer. I don’t know why sometimes I remember to use this and sometimes don’t!

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#7

I do this by thinking of the “backticks as attribute values” as one of the best ways to “craft a string, concatenate, substitute values. including with filters” to give us a value.

  • Perhaps with the next best being using functions (may need join[]), but the function is defined at the top in pragma and not in-line.
  • In part because define, which can be used for substitution, is deprecated and along with procedures is not evaluated until the final render (unless you used wikify/transclude)

Backticks as attribute values;

  • As a result it is great for constructing a filter string, tooltip etc… from parts to give to a parameter.
  • And also its ability to be used against html tag attributes as readily as with widgets etc…
  • Keep in mind you can also use it to set variables set/let/vars

I think I will publish a Tip on this.

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#8

Just for chuckles, here’s the data tiddler I used when testing this:

onomatopoeia: just what it sounds like
monosyllabic: no it's not
phonetic: really should begin with an "F"
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