Hi, my survey requires email insertion in a field.
I want that two users cannot insert same email but i can't find any way to run this validation.
In alternative I think to solve this problem with email registration but I don't want send any email in my public survey.

So, in other words, how can design a simple PUBLIC survey with these two question:
1 - insert your email (valid email, UNIQUE)
2 - are you agree with... (boolean response)

Thank you

ernestocivello wrote: For email validation, easy way:
docs.limesurvey.org/Using+regular+expressions#Email_Validation:

But test only if email exist but only if email are valid.

But if you want more control, for example UNIQUE, need ajax validation.

You can test if MX exist too in ajax : php.net/manual/function.checkdnsrr.php

Denis

Thank you for your answer but I don' understand very well

If I run an ajax validation to check UNIQUE email, which service I have to call?
Do I have implement a service that accesses to limesurvey db or this service is just included in limesurvey?

Currently there is no inbuild feature for checking answers at the DB and comparing with current survey values.
The only solution is to code an Ajax call which calls a PHP script to query the DB and check if the email entered already exists.

Ok!
Last question: can i enable public registration and disable registration email?
In this way I can require email (unique) insertion at the first step...
What do you think about?

After public registration the user is sent an email with the token assogned to him so it might not be a good idea to remove the registration email.
The confirmation email at the ene of a survey is not sent if the email text and subject is empty. Maybe that works as well.
But I think there is no check for dplicate email during registration.

Mazi wrote: LS check for duplicate email during registration:

[code type=php-brief] $register_errormsg=$clang->gT("The email you used has already been registered.");[/code]

DenisChenu wrote: Thanks for the information, Denis. Then this should work well.

DenisChenu wrote:
Hi Denis.
Maybe i could use this for my problem (www.limesurvey.org/en/forum/can-i-do-thi...-with-the-same-email)? What do you think? Would i have problems if i comment code lines out in register.php? Which lines?