New Twiddle

components.button-with-confirmation.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions:{
      submitConfirm() {
    if (this.args.onConfirm) {
      // call `onConfirm` with a second argument
      await this.args.onConfirm(this.confirmValue);
    }

    this.showConfirmation = false;
  }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
      sendMessage(messageType, messageText) {
    // send message here and return a promise
  }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<ButtonWithConfirmation
  @text="Click to send your message."
  @onConfirm={{action this.sendMessage "info"}}
as |confirmValue|>
  <Input @value={{confirmValue}} />
</ButtonWithConfirmation>
{{outlet}}
<br>
<br>

templates.components.button-with-confirmation.hbs

<button type="button" {{action this.launchConfirmDialog}}>{{this.text}}</button>

{{#if this.confirmShown}}
  <div class="confirm-dialog">
    {{yield this.confirmValue}}
    <button class="confirm-submit" type="button" {{action this.submitConfirm}}>OK</button>
    <button class="confirm-cancel" type="button" {{action this.cancelConfirm}}>Cancel</button>
  </div>
{{/if}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}