Pass the ActionEvent (with params) to registerActionOption callbacks

docs/reference/actions.md

@@ -131,7 +131,7 @@ The list of supported modifier keys is shown below.
 
 Sometimes a controller needs to listen for events dispatched on the global `window` or `document` objects.
 
-You can append `@window` or `@document` to the event name (along with any filter modifier) in an action descriptor to install the event listener on `window` or `document`, respectively, as in the following example:
+You can append `@window` or `@document` to the event name (along with any filter modifer) in an action descriptor to install the event listener on `window` or `document`, respectively, as in the following example:
 
 <meta data-controller="callout" data-callout-text-value="resize@window">
 
@@ -215,12 +215,12 @@ route the event to the controller action, return `true`.
 
 The callback accepts a single object argument with the following keys:
 
-Name    | Description
---------|------------
-name    | String: The option's name (`"open"` in the example above)
-value   | Boolean: The value of the option (`:open` would yield `true`, `:!open` would yield `false`)
-event   | [Event][]: The event instance
-element | [Element]: The element where the action descriptor is declared
+| Name    | Description                                                                                           |
+| ------- | ----------------------------------------------------------------------------------------------------- |
+| name    | String: The option's name (`"open"` in the example above)                                             |
+| value   | Boolean: The value of the option (`:open` would yield `true`, `:!open` would yield `false`)           |
+| event   | [Event][]: The event instance, including with the `params` action parameters on the submitter element |
+| element | [Element]: The element where the action descriptor is declared                                        |
 
 [toggle]: https://developer.mozilla.org/en-US/docs/Web/API/HTMLDetailsElement/toggle_event
 [Event]: https://developer.mozilla.org/en-US/docs/web/api/event

src/core/binding.ts

@@ -29,8 +29,9 @@ export class Binding {
   }
 
   handleEvent(event: Event) {
-    if (this.willBeInvokedByEvent(event) && this.applyEventModifiers(event)) {
-      this.invokeWithEvent(event)
+    const actionEvent = this.prepareActionEvent(event)
+    if (this.willBeInvokedByEvent(event) && this.applyEventModifiers(actionEvent)) {
+      this.invokeWithEvent(actionEvent)
     }
   }
 
@@ -65,12 +66,14 @@ export class Binding {
     return passes
   }
 
-  private invokeWithEvent(event: Event) {
+  private prepareActionEvent(event: Event): ActionEvent {
+    return Object.assign(event, { params: this.action.params })
+  }
+
+  private invokeWithEvent(event: ActionEvent) {
     const { target, currentTarget } = event
     try {
-      const { params } = this.action
-      const actionEvent: ActionEvent = Object.assign(event, { params })
-      this.method.call(this.controller, actionEvent)
+      this.method.call(this.controller, event)
       this.context.logDebugActivity(this.methodName, { event, target, currentTarget, action: this.methodName })
     } catch (error: any) {
       const { identifier, controller, element, index } = this

src/tests/modules/core/event_options_tests.ts

@@ -213,6 +213,43 @@ export default class EventOptionsTests extends LogControllerTestCase {
     this.assertActions({ name: "log", eventType: "toggle" })
   }
 
+  async "test custom action option callback event contains params"() {
+    let lastActionEventParams: Object = {}
+
+    // clone the params to ensure we check the value as the callback receives it
+    // not the event after all actions have resolved
+
+    const mockCallback = ({ event: { params = {} } = {} }) => {
+      lastActionEventParams = { ...params }
+    }
+
+    this.application.registerActionOption("all", (options: Object) => {
+      mockCallback(options)
+      return true
+    })
+
+    this.buttonElement.setAttribute("data-c-custom-number-param", "41")
+    this.buttonElement.setAttribute("data-c-custom-string-param", "validation")
+    this.buttonElement.setAttribute("data-c-custom-boolean-param", "true")
+    this.buttonElement.setAttribute("data-d-should-ignore-param", "_IGNORED_")
+
+    await this.setAction(this.buttonElement, "click->c#log:all")
+
+    await this.triggerEvent(this.buttonElement, "click")
+
+    this.assertActions({ name: "log", identifier: "c", eventType: "click", currentTarget: this.buttonElement })
+
+    const expectedEventParams = {
+      customBoolean: true,
+      customNumber: 41,
+      customString: "validation",
+    }
+
+    this.assert.deepEqual(this.controllerConstructor.actionLog[0].params, expectedEventParams)
+
+    this.assert.deepEqual(lastActionEventParams, expectedEventParams)
+  }
+
   setAction(element: Element, value: string) {
     element.setAttribute("data-action", value)
     return this.nextFrame