Need hidden field at registration

We need to get a result of a PAP cookie in a hidden field at CB registration page in order to get a proper parent for our new users
We need to have
Following use of this js code

Can I use a CB field to do this and how ?
I need to send the result to PAP registration php page in order to set the proper relation affiliate/parent

Add your hidden field with a delimiter field then use CB Auto Actions to add your JS to the registration page by using the before registration display trigger. If you want the field stored with the user though you'll need to use a normal text field for example then hide it with CSS.

CB auto actions fails with this kind of js code

if I select inline js, this will insert it in full and throw js errors by repeating the script tags, and if I try to insert the url first I cannot add the id tag in the script !

Is there any other way to do it ?

You'll need two auto actions for the same trigger. 1 as JS (URL) to add your script then another as JS (Inline) to add the inline JS. Example as follows.

JS (URL)
URL: /affiliation/scripts/salejs.php

Note the above URL probably needs to include live site domain.

JS (Inline)
Code: PostAffTracker.writeAffiliateToCustomField('affCookieInfoId');

krileon wrote: JS (URL)
URL: /affiliation/scripts/salejs.php

What I meant was that for this URL there is no way to add the ID tag which is needed.

Do you have any suggestions on this ?

I see, in that case set Method to Header and supply it your code block above in your original post. This adds custom header HTML.