[chaley]

Originally Posted by myki

Thanks for your help, I like it clear and efficient
I have (I hope) a last improvement to do :
I need to make a custom field (#kobocollections), which content is feed by another custom field if not empty (#categorieperso), and a custom value if empty ({authors:sublist(0,1,&)}{series:| - |}).

I succeeded by using :

program:
	a = field('#categorieperso');
	b = template('{authors:sublist(0,1,&)}{series:| - |}');
	test(field('#categorieperso'), a, b)

FWIW: you could use

program:
	a = field('#categorieperso');
	b = template('{authors:sublist(0,1,&)}{series:| - |}');
	ifempty(a, b)

or

program:
	ifempty(
		field('#enum2'), 
		template('{authors:sublist(0,1,&)}{series:| - |}'))

But can you explain to me why with this :

{#categorieperso:'ifempty($, template('{authors:sublist(0,1,&)}{series:| - |}'))'}

I get a template error formatter when my serie own a " ' " ??

Can you help me again, please ??

You cannot put { or } characters in a template program mode template. The substitutions indicated by the {} characters happen before the template program fragment is evaluated, confusing the template evaluator. In your case the apostrophe is being interpreted as a string delimiter, creating a syntax error. You must use general program mode when you wish to evaluate sub-templates.