Fix Ninja Forms Ajax processing.

assets/js/hcaptcha-nf.js

@@ -2,7 +2,7 @@
  * Ninja Forms controller file.
  */
 
-/* global hcaptcha, Marionette, Backbone */
+/* global hcaptcha, Marionette, nfRadio */
 
 wp.hooks.addFilter(
 	'hcaptcha.ajaxSubmitButton',
@@ -20,12 +20,12 @@ document.addEventListener( 'DOMContentLoaded', function() {
 	const HCaptchaFieldController = Marionette.Object.extend( {
 		initialize() {
 			// On the Form Submission's field validation.
-			const submitChannel = Backbone.Radio.channel( 'submit' );
+			const submitChannel = nfRadio.channel( 'submit' );
 			this.listenTo( submitChannel, 'validate:field', this.updateHcaptcha );
 			this.listenTo( submitChannel, 'validate:field', this.updateHcaptcha );
 
 			// On the Field's model value change.
-			const fieldsChannel = Backbone.Radio.channel( 'fields' );
+			const fieldsChannel = nfRadio.channel( 'fields' );
 			this.listenTo( fieldsChannel, 'change:modelValue', this.updateHcaptcha );
 		},
 
@@ -38,7 +38,7 @@ document.addEventListener( 'DOMContentLoaded', function() {
 			// Check if the Model has a value.
 			if ( model.get( 'value' ) ) {
 				// Remove Error from Model.
-				Backbone.Radio.channel( 'fields' ).request(
+				nfRadio.channel( 'fields' ).request(
 					'remove:error',
 					model.get( 'id' ),
 					'required-error'

readme.txt

@@ -563,6 +563,7 @@ Instructions for popular native integrations are below:
 
 = 4.4.0 =
 * Fixed conflict with Ninja Forms Upload field.
+* Fixed Ninja Forms Ajax processing.
 
 = 4.3.1 =
 * Added a live form in the Contact Form 7 admin form view.