How to generate titles for childern of Tiddlers seting the title and a number based on the count widget.

[Jan]

Hi
I tried the following construction to achieve this:

\define titelsetzen() [[$(titel)$]]
\define StundenTitel() $(titel)$ - $(counter)$
\define neueStunde()
<$set name="counter" value=<<calc !!counter +1>>
<$vars tagthema={{!!thema}} titel={{!!title}}>
<$button>
<$action-setfield counter=<<counter>>/>
<$action-sendmessage
$message="tm-new-tiddler"
text={{$:/MetaTabs/MusterStunde}}
thema={{!!thema}} seminar={{!!seminar}}
title=<<StundenTitel>>
source=<<titelsetzen>>
tags="Stunde"/>
neu
</$button>
</$vars>
</$set>
\end

<<neueStunde>>

Unfortunately the title I get is just " - "
Does anyone see the mistake?

Thanks Jan

[Tobias Beer]

Hi Jan,

1. Do you actually have calc @ tb5 installed?
   
• Did you save and reload your wiki (since it's a JavaScript module)?
  
2. Your $set widget openening tag appears to not have a closing ">".
• Also, you could just use one $vars widget and not use $set at all.
  

Best wishes,

Tobias.

[Jan]

Thanks Tobi,
I thought calc was a core feature... a very  useful thing you did there.
Your help put me a great deal ahead...


Calc does not render if the counter-Field does not exist or is empty.
I am using this as a template so I need a switch for the first Child where the counter field won't exist:

\define titelsetzen() [[$(titel)$]]
\define StundenTitel() $(titel)$ - $(counter)$
\define neueStunde()

<$list filter="[all[current]!has[counter]]">
<$vars tagthema={{!!thema}} titel={{!!title}} counter="1" >
<$button>
<$action-setfield counter="1"/>

<$action-sendmessage
  $message="tm-new-tiddler"
  text={{$:/MetaTabs/MusterStunde}}
  thema={{!!thema}} seminar={{!!seminar}} 
  title=<<StundenTitel>>
  source=<<titelsetzen>>
  tags="Stunde"/>

Stunde hinzufügen
</$button>
</$vars>
</$list>
<$list filter="[all[current]has[counter]]">
<$button>
<$vars tagthema={{!!thema}} titel={{!!title}} counter=<<calc !!counter +1>> >

<$action-setfield counter=<<counter>>/>
<$action-sendmessage
  $message="tm-new-tiddler"
  text={{$:/MetaTabs/MusterStunde}}
  thema={{!!thema}} seminar={{!!seminar}} 
  title=<<StundenTitel>>
  source=<<titelsetzen>>
  tags="Stunde"/>

Stunde hinzufügen
</$vars>
\end

Am 01.09.2016 um 08:21 schrieb Tobias Beer:

Hi Jan,

1. Do you actually have calc @ tb5 installed?
   
2. Did you save and reload your wiki (since it's a JavaScript module)?

1. your $set widget openening tag appears to not have a closing ">"
• also, you could just use one $vars widget and not use $set at all
  

Best wishes,

Tobias.

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[Tobias Beer]

Hi Jan,

 

Calc does not render if the counter-Field does not exist or is empty.

I could extend calc, so that it would initialize the value
when it would otherwise be undefined / NaN, e.g.:

<<calc "0=>!!counter" +1>>

Meaning:

• if counter is undefined / NaN, initialize as 0
• if counter is a number, add 1

You could initialize with a numeric value of your choice:

<<calc "7=>!!counter" +1>>

I would make it so that whatever is left of "=>"
would have to be numeric for the expression to be valid.

With spaces in text references:

<<calc "7=>with spaces!!counter" +1>>

or:

<<calc [[7=>with spaces!!counter]] +1>>

Would that help?

Best wishes,

Tobias. 

[Tobias Beer]

Hi Jan,

I have made an update of calc to allow initialization of undefined fields:

Get it here: calc @ tb5 

Implementation:

<<calc "0=>!!counter" +1>>

Meaning:

• if counter is undefined / NaN, initialize as 0
• if counter is a number, add 1

Best wishes,

Tobias. 

[Tobias Beer]

Hi again, Jan,

I actually updated it again, so that both parameters value and by can be initialized.

<<calc "2=>!!counter" * by:2=>!!counter>>

Another oversight: calc now supports full text-references, not just those for fields.

Get the update from here:

calc @ tb5 

Best wishes,

Tobias.

[Jan]

Hi Tobias,
It is a little harder to understand but so much more elegant than my bulky workarround...
I will replace it as soon as possible.

Thanks a lot
Jan

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[Tobias Beer]

Hi Jan,

 

It is a little harder to understand but so much more elegant than my bulky workaround...

I will replace it as soon as possible.

The "by" parameter made it so much easier
to simply define a calculation with fields.

Take this example: 

<<calc !!order +2>>

How would you make it so that the 2
can be read from some text-reference?

See, you would need:

• a helper macro
• a helper variable
• and then use the macrocall-widget to use calc

\define op() +$(num)$

<$vars num={{!!that-field}}>
<$macrocall $name=calc value="!!order" operation=<<op>>/>
</$vars>

Oy, bummer, now you can't use calc
anymore as an attribute to a widget!

Plus, isn't that way too difficult?

This, on the other hand, is much simpler:

<<calc !!order + by:!!that-field>>

And now you can add initialization on top:

<<calc 0=>!!order + by:1=>!!that-field>>

Not all that difficult, after all.

Best wishes,

Tobias.