jorgegorka/gist:7fa359ccc5fc06a25e3af82925db4a2f

## gistfile1.txt
<body data-controller="outer">
  ...
  <!-- Some newly inserted targets: -->
  <div data-target="outer.thing" data-controller="inner">1...</div>
  <div data-target="outer.thing" data-controller="inner">2...</div>
</body>
Each target has its own inner controller, which emits an inner-connected event when connected:

// inner_controller.js
export default class extends Controller {
  connect() {
    const event = document.createEvent("CustomEvent")
    event.initCustomEvent("inner-connected", true, true, null)
    this.element.dispatchEvent(event)
  }
}
Add a data-action to the body element to call the thingConnected() method in response to those events:

<body data-controller="outer" data-action="inner-connected->outer#thingConnected">
   ...
// outer_controller.js
export default class extends Controller {
  static targets = [ "thing" ]

  thingConnected(event) {
    console.log(event.target) // the element that was just connected
  }
}


https://github.com/hotwired/stimulus/issues/200#issuecomment-434731830
	<body data-controller="outer">
	...
	<!-- Some newly inserted targets: -->
	<div data-target="outer.thing" data-controller="inner">1...</div>
	<div data-target="outer.thing" data-controller="inner">2...</div>
	</body>
	Each target has its own inner controller, which emits an inner-connected event when connected:

	// inner_controller.js
	export default class extends Controller {
	connect() {
	const event = document.createEvent("CustomEvent")
	event.initCustomEvent("inner-connected", true, true, null)
	this.element.dispatchEvent(event)
	}
	}
	Add a data-action to the body element to call the thingConnected() method in response to those events:

	<body data-controller="outer" data-action="inner-connected->outer#thingConnected">
	...
	// outer_controller.js
	export default class extends Controller {
	static targets = [ "thing" ]

	thingConnected(event) {
	console.log(event.target) // the element that was just connected
	}
	}


	https://github.com/hotwired/stimulus/issues/200#issuecomment-434731830