For a client i have 3 pages of content including Joomla registration, everything works fine until a second entry. (E-mail already used)

So my solutions is to combine 2 fields before submitting and use that as e-mail to register. (I don’t want a second form) I already have to confirm the entry so adapting the e-mail isn’t the problem.

Example, on the first page the customer filled in a client insurance number and a e-mail. So I want to register “client insurance number + e-mail” as an e-mail.

I already tried this :
www.rsjoomla.com/forum/37-rsform-pro/142...ast-name-fields.html

it won’t work because the registration runs before the combine function

Assuming that your fields are named as follows:

- the client insurance number field is called 'number'
- the email field is called 'email'

you will need to place the following script in Components >> RSForm!Pro >> Manage Forms >> edit your form >> PHP Scripts >> Script called on form process:

Already tried that one, but it looks like the joomla registration is be handled first.

I have tested this multiple times on a local installation and the Joomla! user account is created using an email address resulted from the combination of the 2 fields.

Thats correct but :

example : This e-mail address is being protected from spambots. You need JavaScript enabled to view it is registrated in the website.

If you fill in the email This e-mail address is being protected from spambots. You need JavaScript enabled to view it within the form on page1 is says :
Invalid email address.

i Think there is a validation on the registrated users

This should work on multi-page forms as well, with the sole condition that you are NOT using an AJAX validation. To turn it off, head to Components >> RSForm!Pro >> Manage Forms >> edit your form >> Properties >> Form Info >> set "Use AJAX Validation" to "No".

You can read more on this topic here:

www.rsjoomla.com/support/documentation/v...form-properties.html

If you wish to keep the AJAX validation, you should use Javascript to combine the number and email fields, but this would be a lot more complicated than the solution I have provided here.