Hi all,I’m stuck creating custom validation for a number entered in a form question.Subjects need to enter a “valid” ID we give them manually in the beginning in order to start the survey.The ID is 6 digits, the last one being a control digit we created. Meaning that it has the following logicsuppose the 5 first digits are 98739, we multiply each digit by either 2 or 1 (alternating), and then sum it up : 9x2 +8x1 +7x2 + 3x1 +9x2 = 18 + 8 + 14 + 3 + 18 = 61so we added a 6th digits that is equal to 61 mod 10, that is 1. Meaning that 987391 is a valid ID, but 987394 isn’t. So far, I’ve been able to check that subject entered 6 digits using Regex /^[0-9]{6}$/giI assume I need to add custom JavaScript to actually check the 6th digit, but I unfortunately have little to no understanding of how to do that. Would appreciate any help I can get.Thank you all!RP

Try setting up this on the questions JacaScript option:Qualtrics.SurveyEngine.addOnload(function() { var that = this; this.questionclick = function(event, element) { var response = that.getChoiceValue(1); if (response.match(/^[0-9]{6}$/)) { var digits = response.split('').map(Number); var checkSum = (digits[0] * 2) + (digits[1] * 1) + (digits[2] * 2) + (digits[3] * 1) + (digits[4] * 2); var controlDigit = checkSum % 10; if (controlDigit !== digits[5]) { alert('Invalid ID. Please enter a valid ID.'); that.setChoiceValue(1, ''); } } else { alert('Please enter a 6-digit ID.'); that.setChoiceValue(1, ''); } };});

Validation of number using check digit

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