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webform submit button is non-responsive for zero-dollar contribution amount

Versions:

  • Drupal 9
  • CiviCRM 5.58.1
  • Webform 6.1.3
  • Webform CiviCRM 6.2.1
  • Stripe 6.8.2
  • PaymentShared 1.2.11

Setup: A simple webform (Drupal config export YAML attached as webform-export.yml), with these configs notable:

  • One existing contact
  • Contribution
    • Processor: Stripe
    • Amount: a two-option radio button set:
      • "zero" for $0.00
      • "one" for $1.00
  • Two webform pages only. All fields are on the first page; only the "Submit button(s)" action is on the second page.

Repro 1: Proper behavior for $1.00 amount:

  1. Open the form and fill all fields as you wish
  2. For the Amount field, select "one" for $1.00
  3. Click next; observe second/final page appears.
  4. Observe Stripe payment block appears; observe total due is $1.00; fill in credit card details and click Submit.
  5. Observe SweetAlert "please wait" message. Form is submitted. Observe form redirects correctly and displays confirmation message.
  6. Find the contribution record in CiviCRM. Observe that it was recorded properly.

Repro 2: Bad behavior for $0.00 amount:

  1. Open the form and fill all fields as you wish
  2. For the Amount field, select "zero" for $0.00
  3. Click next; observe second/final page appears.
  4. Observe total due is $0.00; observe Stripe payment block does not appear. Click Submit.
  5. Observe no discernable change in the page as a result of the Submit click. (The Submit button appears to be completely non-functional.)

Technical notes:

  • Inspection of JavaScript in browser devtools reveals that the Submit click proceeds as far as line 605 of js/civicrmStripe.js. The stack trace shows that the calling function was line 438 of the same file.
  • Per the JS file, the comment above line 605 says "If we have selected Stripe but amount is 0 we don't submit via Stripe", so this it seems intentional that the Stripe processing should end here; however it's probably not intentional that the entire webform submission ends prematurely as it does.

See also:

  • #383 "Webform won't allow user to submit if total is zero"
    • This may be the same issue, but that ticket relates to multi-participant event registration and a more complex webform with conditional behaviors.
    • #383 suggests a possible work-around by moving one or more fields to one of the pages before the last "submit buttons" page; in my case I've made sure there are no field at all on that last page.

(Joinery internal reference: Asana 1204591534877896)