focus in events

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  logs: [],
  
  actions: {
    log(message, event) {
      this.set('logs', [...this.logs, message, `Target: ${event && event.target.outerHTML}`]);
    }
  }
});

templates.application.hbs

<h2>Element Modifier</h2>
<div {{action "log" "on=focusIn works" on="focusIn"}}>
  <input />
</div>

<h2>DOM attribute onfocusin</h2>
<div onfocusin={{action "log" "onfocusin= works"}}>
  <input />
</div>

<h2>DOM attribute focusin</h2>
<div focusin={{action "log" "onfocusin= works"}}>
  <input />
</div>

<h2>DOM attribute onfocus-in</h2>
<div onfocus-in={{action "log" "onfocus-in= works"}}>
  <input />
</div>

<h2>DOM attribute onfocus (doesn't bubble)</h2>
<div onfocus={{action "log" "onfocus= works"}}>
  <input />
</div>

<h2>DOM attribute onclick</h2>
<div onclick={{action "log" "onclick= works"}}>
  <input />
</div>

{{#each logs as |msg|}}
  <p>{{msg}}</p>
{{/each}}

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
  }
}