accessible-form

components.my-form-input.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName:'',
  actions:{
   focusout(){
   	this.focusout();
   } 
  }
});

components.my-form.js

import Ember from 'ember';

export default Ember.Component.extend({
  buttonDisabled: true,
  
  actions:{
   submitForm(){
   
   },
   focustoutUn(){
			//alert('rr');
   },
    passwordFocusout(){

    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

input {
	display: block;
}

templates.application.hbs

{{outlet}}
<MyForm />

templates.components.my-form-input.hbs

{{yield}}
<label for={{id}}>{{label}}</label>
{{input id=id type="text" value=value focusOut=(action "focusout") 
ariaErrormessage="errMsg" aria-invalid=ariaInvalid}}
<p id="errMsg" aria-live="on" style="color:red;">
  {{#if errorMessage}}
    {{errorMessage}}
  {{/if}}
</p>

templates.components.my-form.hbs

{{yield}}
<h4>Formy</h4>

<fieldset>
<legend>Simple Form</legend>
<form>
<MyFormInput @label="User name" 
	@id="username"
	@focusout={{action "focustoutUn"}}
  @ariaInvalid={{ariaInvUn}}
  @errorMessage={{errMsgUn}}
  aria-errormessage="afd"
 />
<br>
{{!--<label for="pwd">Password</label>
{{input id="pwd" type="text" value=password focusOut=(action "passwordFocusout") 
aria-errormessage="errMsgPwd" aria-invalid=ariaInvPwd}}--}}
<br>
<button type="submit" {{action "submitForm"}} disabled={{this.buttonDisabled}}>Login</button>
</form>
</fieldset>

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"
  }
}