[Throwaway]

So I have a calendar that will allow a user to input the meeting date. However, they can submit/next without entering a date and it will get stuck in the loop to check for the date forever.

What would be the best way to have the form redirect to the previous step if @@appointmentDate == ""
or maybe something like

if (empty(@@appointmentDate)) {

} else {

}

I'm not sure if it would be better to use the gateway functionality somehow or if it would be better to use in a trigger.

[AlanBueno]

The best way to accomplish that is to use gateways and route the process to the same task with the same user if the date was not summited.

You can find the detailed procedure here: viewtopic.php?f=40&t=730256&p=813315&hi ... nt#p813315

[amosbatto]

You can use a loopback as Alan noted if the case is in a subsequent task, but it is much easier to use form.setOnSubmit() to check when the user submits the form whether the date field is empty.

If you want to check in a trigger after the Dynaform, then you can use PMFRedirectToStep() to redisplay the Dynaform if the date field's variable is empty.