Hi, I am trying to create a form where the minimum attachment is based on the amount of rows in a repeating table where a field is equal to true

within a repeating section I have a field titled evidence which is a yes or no choice. I am trying to come up with a solution where if there is 5 rows in a repeating section and 2 of those rows have the evidence field set to yes then the minimum attachments should be 2.

I assume I might need to use JavaScript.

10 replies

Userlevel 7
Badge +17


By merging together cool answer from  Marian Hatala‌: attachments custom validation, together with OOB Nintex features, you can achieve it that way:

  1. Set name to the "checkbox" field in your repeating section, ex. "EvidenceNeeded"
  2. Put the following javascript validation method into the "Custom JavaScript" section of your form's settings:
    function GetNumberOfAttachments(attCtrlClassName){
       return NWF.FormFiller.Attachments.GetAttachedFilesCount(NWF.FormFiller.Functions.GetFillerDivObjectForControl(NWF$("#"+NWF$("." + attCtrlClassName + " .nf-attachmentsRow")[0].id)).data('controlid'))
  3. Set a class name for your attachments field:
    1. Open "properties"
    2. Scroll to "Formatting" group
    3. Add your custom class (you don't need to replace the existing ones) to the "CSS class" attribute, ex.: "AttachedEvidences"
  4. Set a validation rule to your "Attachment" field:
    GetNumberOfAttachments("AttachedEvidences") != sum(EvidenceNeeded)
    1. "AttachedEvidences" is that class name from step no. 3
    2. EvidenceNeeded is the named control (it has to be named control!) that you set in step no. 1
  5. Save, run/ preview and you will notice, that your form is properly validated.



Userlevel 7
Badge +17

Elias Hantzis has my solution worked for you? If so, please mark my answer as correct. Thanks!

Regards, Tomasz 

Hi Tomasz,

I haven’t had time to implement this solution. My apologies.


Elias Hantzis

ICT Administrator

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Userlevel 7
Badge +17

No problem. Find your time and post a feedback

The described solution was tested by me and was working fine. 




Tomasz Poszytek‌, got any solution for responsive forms?

Userlevel 7
Badge +17

Nope, I don't. I suggest you to play around with rules. Maybe it would work if you use expressions to count rows and attachments, then to compare both outcomes. But I don't know if that is feasible.

Best regards,

Tomasz Poszytek

e-mail: tomasz@poszytek.eu

tel: +48 603 993 372

www/ blog: https://poszytek.eu

twitter: @TomaszPoszytek

Badge +1

Hi Tomasz Poszytek‌,

I tried your solution on the responsive form and it's not working. It seems there is no validation at all in this control (even with simple validation rule).

Did you find other solution to this issue? 



Userlevel 7
Badge +17


that solution was indeed for Standard forms, not RWD. If there are no rules to count number of attachments in RWD forms, then there is no way to achieve it. If you need such functionality maybe consider switching back to Standard form?



Badge +5

I am curious about whether this solution still works? Both myself and colleague have spent ages trying to get this to work in O365 Classic forms with no success. Following these steps exactly I always get a value of zero returned regardless of how many attachments there are. I need to get this value on the form prior to the first save to properly validate a Save as Draft vs Submit button. I.e. the user should be able to save the form as draft with no attachment but at least one attachment is required to submit.

Badge +2

Elias Hantzis has my solution worked for you? If so, please mark my answer as correct. Thanks!


Regards, Tomasz 

It worked perfectly with me,

Many thanks Sir,

Just for clarification, it is better to add to your example this part below:

3.Add your custom class (you don't need to replace the existing ones) to the "CSS class" attribute after a space, ex:

nf-form-label nf-section AttachedEvidences