# onAssignedDocumentWillSubmit(_:) Adds an action to perform before submitting an assigned document. ``` @MainActor @preconcurrency func onAssignedDocumentWillSubmit(_ action: @escaping @Sendable (URL) async -> Bool) -> some View ``` ## Parameters `action` An asynchronous closure that receives the document URL and returns a Boolean value indicating whether to proceed with submission. Return `true` to continue, or `false` to cancel. ## Return Value A view that executes the specified action before assigned document submission. ## Discussion Return `true` to allow the submission to proceed, or `false` to cancel the submission. This is useful for validating document content, confirming user intent, or performing prerequisite operations. ```swift AssignedDocumentSubmissionButton(documentURL: documentURL) .onAssignedDocumentWillSubmit { url in // Validate the assigned document before submission guard await isDocumentComplete(url) else { await showAlert("Please complete all sections before submitting") return false // Prevents submission } return true // Allows submission to continue } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)