Range Slider

components.range-slider\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';

export default class extends Component {
  get handleStyles() {
    const fraction = (this.args.currentValue / this.args.max) * 100;
    return `left: ${fraction}%`;
  }
  
  @action
  onClick(event) {
    const { clientX } = event;
    const { width, x } = event.target.getBoundingClientRect();
    this.args.onChange(((clientX - x) / width) * 100);
  }
}

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class ApplicationController extends Controller {
  @tracked
  currentValue = 30;

  @action
  onChange(value) {
    this.currentValue = value;
  }
}

styles.app\.css

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

.range-slider {
  height: 100px;
  background-color: lightgrey;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 10px;
}
.range-slider--interactive {
  position: relative;
  display: flex;
  justify-content: center;
  height: 10px;
  background-color: grey;
}

.range-slider--handle {
  position: absolute;
  left: 40%;
  height: 10px;
  width: 10px;
  border-radius: 50%;
  background-color: red;
  margin-left: -5px;
}

templates.application\.hbs

<h1>Current Range Value: {{this.currentValue}}</h1>
<RangeSlider 
	@min={{0}} 
  @max={{100}} 
  @currentValue={{this.currentValue}} 
  @onChange={{this.onChange}} />
<br>
<br>
{{outlet}}
<br>
<br>

templates.components.range-slider\.hbs

<div class="range-slider">
  <div 
  	class="range-slider--interactive" 
    {{on "click" this.onClick}}>
    
    <div class="range-slider--handle" style={{this.handleStyles}}></div>
    
  </div>
</div>

twiddle\.json

{
  "version": "0.17.0",
  "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/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}