what goes wrong here with: tm-download-file

[Mohammad]

This is a sample code to create an export button and lets save a set of tiddlers into a static .html

• It uses a search box to lets filter all non system tiddlers tagged with Concepts
• To reproduce 
• Create a tiddler on tiddlywiki.com
• copy and paste the below code and save it
• next enter something in the saerch box to select some tiddlers (for example enter p)
• next click on export and see nothing has been exported!!

\define myTag() Concepts

\define test-export()

<$edit-text tag=input tiddler=tid2 />

<$set name=searchTerms tiddler=tid2 field=text>

<$vars ufilter="[!is[system]tag<myTag>search:title<searchTerms>]" >

<<doExport>>

<$button>Export

<$action-sendmessage 

  $message="tm-download-file" 

$param="$:/core/templates/exporters/StaticRiver" 

exportFilter=<<ufilter>>

filename=<<exportButtonFilename """nella""">>/>

</$button>

<hr>

<$list filter=<<ufilter>> >

</$list>

</$vars>

</$set>

\end

<<test-export>>

It seems something goes wrong when I use variables to create the export filter

[Mohammad]

It seems when I use <<ufilter>> tm-download-file does not work but for $(uifilter)$ it works!!

--Mohammad

[Eric Shulman]

On Friday, December 27, 2019 at 7:04:58 AM UTC-8, Mohammad wrote:

It seems when I use <<ufilter>> tm-download-file does not work but for $(uifilter)$ it works!!

just a guess, but... I think that tm-download-file is processed asynchronously.

Thus, when using <<ufilter>>, the variable is not defined when the message is processed

but using $(ufilter)$ it is replaced by it's value when the message is sent, so that it's value

it available when the message is processed.

I've run into similar issues when using tm-modal, which is also asynchronous.

-e

[Mohammad]

Hi Eric,

 Thanks for clarification!

Still I am confused when I should use <<var>>, <<__par__>> and when $(var)$ and $par$.

I followed your code on http://tiddlytools.com/filtergenerators.html and solved the issue in my last post

but with your explanation here, it seems I need a parsed value when I work with asynchronous .

I have collected some notes from forum to understand how to work with these vars and pars.

See TW-Scripts below (one is yours)

https://kookma.github.io/TW-Scripts/#Variables%2C%20Fields%20and%20Filters%20in%20TiddlyWiki:%5B%5BVariables%2C%20Fields%20and%20Filters%20in%20TiddlyWiki%5D%5D%20%5B%5BVariables%20vs.%20Parameters%5D%5D

Still not fluent in coding when I encounter such cases!

--Mohammad

[Chuck R.]

This is a sample code to create an export button and lets save a set of tiddlers into a static .html

That would be really handy, as I'm currently considering splitting a bunch of tiddlers from my TW5 file into a separate file. I might have to split off 30-40 tiddlers.

[Mohammad]

I will add such tools to Favorites plugin will be published soon!