searchable select

components.my-component\.js

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { inject as service } from '@ember/service';
import { action } from '@ember/object';

export default class extends Component {
  @service session;
 
  @tracked searchString;
  @tracked selectedLocale = this.allLocales[0];
  
  get allLocales() {
    return [
      { name: 'Global' },
      ...this.session.locales.map(loc => ({ name: loc })),
    ];
  }

	get filteredLocales() {
    return this.searchString
      ? this.allLocales.filter(
        loc => loc.name.toLowerCase().includes(this.searchString.toLowerCase())
      )
      : this.allLocales;
  }

  @action
  selectLocale(locale) {
    this.selectedLocale = locale;
  }

  @action
  clearSearch() {
    this.searchString = undefined;
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

services.session\.js

import Service from '@ember/service';

export default class SessionService extends Service {
  locales = ['en-US', 'fr-FR', 'es-ES'];
}

templates.application\.hbs

<MyComponent />

templates.components.my-component\.hbs

<Input @value={{this.searchString}}/>

<button {{on "click" this.clearSearch}}>clear</button>

<ul>
  {{#each this.filteredLocales as |locale|}}
    <li
      {{on "click" (fn this.selectLocale locale)}}
      style="cursor: pointer"
    >
      {{locale.name}}
    </li>
  {{/each}}
</ul>

Selected locale: {{this.selectedLocale.name}}

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}