Prevent filling a field with a value that someone has already filled in (prevent repeated responses)

Greetings, Please, how I can validate a field, that is, a survey fills out, for example a phone number, and if another person fills out the same survey and puts the same phone number, prevents you from filling it out or sending an alert (personalized message) that phone (has already been registered previously.


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Hi,
you did not answer the initial questions.
So this answer may not apply.

You can use the function "statCountIf" in a question of type equation like
 {statCountIf(Q1.sgqa, "="+Q1)}
to count the number of already given entries in Q1 equal to the actual entry.
Screen out if the number is already greater than 0..

Joffm

Joffm

[img]blob:https://maestro21edupe-my.sharepoint.com/a4774a78-f32f-4c35-b0a2-b3bfeb367613[/img]Show error at the function StatCountif

Gracias

Edit: Okay, you saw your mistake.
This is not an equation to validate the question.
Read the manual about question validation and subquestion validation
[url] www.limesurvey.org/manual/Question_type_...28em_validation_q.29 [/url]
or study the demo surveys about this.
[url] www.limesurvey.org/manual/ExpressionScri...Validation_Equations [/url]

Create a new question of type equation where you insert the formula.to store the number and to use this to proceed according to your wishes.

Joffm

BTW:
A validation equation is a logical term (either TRUE or FALSE).
So you may use
 statCountIf(Q1.sgqa, "="+Q1)==0
But I do not see a sense in it. You force a number that was not entered before.
But what do you do if the respondent doesn't have a different one?
 

I'm sorry Sir, and yes, the plugin it`s active.