Multiple select input field - helper form

[silenco]

Hello

 

i need information how to deal with select multiple in HelperForm

I create form using dev manuals and HelperForm class, also main lead for me was blockcms module

 

http://doc.prestashop.com/display/PS15/HelperForm

 

on form i have text field, select, select multiple, and textarea

i know how to set for text, textarea and select but i don't know how to set value for select multiple

for each field i have 2 values which depends is it form for add new or for editing

but for select multiple i get error:

 

[php Notice #8] Undefined index: grouped_categories[]

 

so my question is how to set multiple values (ie. defaults ) for select multiple input field

 

Thanks in advance

 

Regards

Sven

Edited March 23, 2014 by silenco (see edit history)

[silenco]

bump

[renaud2263]

Hi, did you found the solution ? I have the same problem.