Troubleshooting Enketo Web Forms

Enketo web forms work on all devices since they open in regular web browsers and allow data collection online or offline. Generally we strongly recommend the latest version of all modern browsers; see here for more details on browsers working with Enketo.

Known issues with offline forms on iOS

iOS (running on iPhones and iPads) devices have several known limitations with using offline-enabled forms due to the Apple operating system platform. We strive to have the latest version of iOS fully supported.

  • Offline data collection works in any modern browser. On iOS we only recommend Chrome or Safari.

  • Version 9.x shows “NotFoundError: DOM IDBDatabase Exception 8”. Solution: Close all Enketo tabs in your browser, then reopen the form. The error should now be gone forever.

  • Version 9.3.1 shows “Attempted to assign to readonly property” when loading offline form

  • Version 8.x shows “undefined is not an object (evaluating ‘c.resources’)”. Solution: Update to latest iOS version

If data collection offline is not required and you are seeing an error on iOS, consider using the online-only version instead of the offline URL.