Ember Polaris vs Aurelia 1: A Comprehensive Comparison

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In the world of frontend development, Ember Polaris and Aurelia 1 represent two different approaches to building web applications. While Ember Polaris brings modern features to the Ember ecosystem with Glimmer components, Aurelia 1 offers a powerful convention-based approach with strong data binding capabilities. Let’s explore their differences and use cases.

Table of Contents

  1. Core Concepts
  2. Reactivity and State Management
  3. Templating and Components
  4. DOM Manipulation
  5. Event Handling
  6. Component Composition
  7. Form Handling
  8. Lifecycle Management
  9. Performance and Bundle Size
  10. Learning Curve
  11. Conclusion

Core Concepts

Ember Polaris and Aurelia 1 take fundamentally different approaches to building web applications:

  • Ember Polaris uses a modern, class-based component model with Glimmer templates and strict-mode JavaScript
  • Aurelia 1 is a convention-based framework that emphasizes standards compliance and powerful data binding

Reactivity and State Management

Declare State

Both frameworks offer different ways to declare and manage state:

Ember Polaris

import Component from "@glimmer/component";

export default class NameComponent extends Component {
  name = "John";

  <template>
    <h1>Hello {{this.name}}</h1>
  </template>
}

Aurelia 1

<!-- name.html -->
<template>
  <h1>Hello ${name}</h1>
</template>

<!-- name.ts -->
export class NameCustomElement { name = "John"; }

Update State

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";

export default class CounterComponent extends Component {
  @tracked name = "John";

  constructor(owner, args) {
    super(owner, args);

    this.name = "Jane";
  }

  <template>
    <h1>Hello {{this.name}}</h1>
  </template>
}

Aurelia 1

<!-- name.html -->
<template>
  <h1>Hello ${name}</h1>
</template>

<!-- name.ts -->
export class NameCustomElement { name = "John"; constructor() { this.name =
"Jane"; } }

Computed State

Ember Polaris

import Component, { tracked } from "@glimmer/component";

export default class DoubleCount extends Component {
  @tracked count = 10;

  get doubleCount() {
    return this.count * 2;
  }

  <template>
    <div>{{this.doubleCount}}</div>
  </template>
}

Aurelia 1

<!-- double-count.html -->
<template>
  <div>${doubleCount}</div>
</template>

<!-- double-count.ts -->
export class DoubleCountCustomElement { count = 10; get doubleCount() { return
this.count * 2; } }

Templating

Minimal Template

Ember Polaris

<template>
  <h1>Hello world</h1>
</template>

Aurelia 1

<template>
  <h1>Hello world</h1>
</template>

Styling

Ember Polaris

<template>
  <h1 class="title">I am red</h1>
  <button style="font-size: 10rem;">I am a button</button>

  <style>
    .title {
      color: red;
    }
  </style>
</template>

Aurelia 1

/* css-style.css */
.title {
  color: red;
}
<!-- css-style.html -->
<h1 class="title">I am red</h1>
<button style="font-size: 10rem">I am a button</button>

Loop

Ember Polaris

const colors = ["red", "green", "blue"];

<template>
  <ul>
    {{#each colors as |color|}}
      <li>{{color}}</li>
    {{/each}}
  </ul>
</template>

Aurelia 1

<template>
  <ul>
    <li repeat.for="color of colors">${color}</li>
  </ul>
</template>

Event Click

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from "@ember/modifier";

export default class Counter extends Component {
  @tracked count = 0;

  incrementCount = () => this.count++;

  <template>
    <p>Counter: {{this.count}}</p>
    <button {{on "click" this.incrementCount}}>+1</button>
  </template>
}

Aurelia 1

<template>
  <p>Counter: ${count}</p>
  <button click.trigger="incrementCount()">+1</button>
</template>

DOM Reference

Ember Polaris

import { modifier } from "ember-modifier";

const autofocus = modifier((element) => element.focus());

<template>
  <input {{autofocus}} />
</template>

Aurelia 1

<template>
  <input ref="inputElement" />
</template>

Conditional

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from "@ember/modifier";
import { eq } from 'ember-truth-helpers';

const TRAFFIC_LIGHTS = ["red", "orange", "green"];

export default class TrafficLight extends Component {
  @tracked lightIndex = 0;

  get light() {
    return TRAFFIC_LIGHTS[this.lightIndex];
  }

  nextLight = () => {
    this.lightIndex = (this.lightIndex + 1) % TRAFFIC_LIGHTS.length;
  };

  <template>
    <button {{on "click" this.nextLight}}>Next light</button>
    <p>Light is: {{this.light}}</p>
    <p>
      You must
      {{#if (eq this.light "red")}}
        STOP
      {{else if (eq this.light "orange")}}
        SLOW DOWN
      {{else if (eq this.light "green")}}
        GO
      {{/if}}
    </p>
  </template>
}

Aurelia 1

<template>
  <button click.trigger="nextLight()">Next light</button>
  <p>Light is: ${light}</p>
  <p>
    You must
    <span if.bind="light === 'red'">STOP</span>
    <span if.bind="light === 'orange'">SLOW DOWN</span>
    <span if.bind="light === 'green'">GO</span>
  </p>
</template>

Lifecycle

On Mount

Ember Polaris

const pageTitle = () => document.title;

<template>
  <p>Page title is: {{(pageTitle)}}</p>
</template>

Aurelia 1

<template>
  <p>Page title is: ${pageTitle}</p>
</template>

On Unmount

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { registerDestructor } from "@ember/destroyable";

export default class Time extends Component {
  @tracked time = new Date().toLocaleTimeString();

  constructor(owner, args) {
    super(owner, args);

    let timer = setInterval(() => {
      this.time = new Date().toLocaleTimeString();
    }, 1000);

    registerDestructor(this, () => clearInterval(timer));
  }

  <template>
    <p>Current time: {{this.time}}</p>
  </template>
}

Aurelia 1

<template>
  <p>Current time: ${time}</p>
</template>

Component Composition

Props

Ember Polaris

import UserProfile from "./user-profile.gjs";

const favoriteColors = ["green", "blue", "red"];

<template>
  <UserProfile
    @name="John"
    @age={{20}}
    @favouriteColors={{favoriteColors}}
    @isAvailable={{true}}
  />
</template>

Aurelia 1

<template>
  <require from="./user-profile"></require>
  <user-profile
    name.bind="name"
    age.bind="age"
    favourite-colors.bind="colors"
    is-available.bind="available"
  ></user-profile>
</template>

Emit to Parent

Ember Polaris

import { on } from "@ember/modifier";

<template>
  <button {{on "click" @onYes}}> YES </button>
  <button {{on "click" @onNo}}> NO </button>
</template>

Aurelia 1

<template>
  <require from="./answer-button"></require>
  <p>Can I come ?</p>
  <answer-button action-handler.call="handleAnswer(reply)"></answer-button>
  <p style="font-size: 50px">${isHappy ? "😀" : "😥"}</p>
</template>

Slot

Ember Polaris

import FunnyButton from "./funny-button";

<template>
  <FunnyButton> Click me! </FunnyButton>
</template>;

Aurelia 1

<template>
  <require from="./funny-button"></require>

  <funny-button>Click me !</funny-button>
</template>

Slot Fallback

Ember Polaris

import FunnyButton from "./funny-button";

<template>
  <FunnyButton />
  <FunnyButton>I got content!</FunnyButton>
</template>;

Aurelia 1

<template>
  <require from="./funny-button"></require>

  <funny-button></funny-button>
  <funny-button>Click me !</funny-button>
</template>

Form Input

Input Text

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';

export default class InputHello extends Component {
  @tracked text = "Hello World";

  handleInput = (event) => (this.text = event.target.value);

  <template>
    <p>{{this.text}}</p>
    <input value={{this.text}} {{on "input" this.handleInput}} />
  </template>
}

Aurelia 1

<template>
  <p>${text}</p>
  <input value.bind="text" />
</template>

Checkbox

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';

export default class InputHello extends Component {
  @tracked isAvailable = false;

  handleChange = (event) => (this.isAvailable = event.target.checked);

  <template>
    <input
      id="is-available"
      type="checkbox"
      checked={{this.isAvailable}}
      {{on "change" this.handleChange}}
    />
    <label for="is-available">Is available</label>
  </template>
}

Aurelia 1

<template>
  <input id="is-available" type="checkbox" checked.bind="isAvailable" />
  <label for="is-available">Is available</label>: ${isAvailable}
</template>

Radio

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';
import { eq } from 'ember-truth-helpers';

export default class PickPill extends Component {
  @tracked picked = "red";

  handleChange = (event) => (this.picked = event.target.value);

  <template>
    <div>Picked: {{this.picked}}</div>

    <input
      id="blue-pill"
      type="radio"
      value="blue"
      checked={{eq this.picked "blue"}}
      {{on "change" this.handleChange}}
    />
    <label htmlFor="blue-pill">Blue pill</label>

    <input
      id="red-pill"
      type="radio"
      value="red"
      checked={{eq this.picked "red"}}
      {{on "change" this.handleChange}}
    />
    <label htmlFor="red-pill">Red pill</label>
  </template>
}

Aurelia 1

<template>
  <div>Picked: ${picked}</div>

  <input id="blue-pill" checked.bind="picked" type="radio" value="blue" />
  <label for="blue-pill">Blue pill</label>

  <input id="red-pill" checked.bind="picked" type="radio" value="red" />
  <label for="red-pill">Red pill</label>
</template>

Select

Ember Polaris

import Component from "@glimmer/component";
import { tracked } from "@glimmer/tracking";
import { on } from '@ember/modifier';

export default class ColorSelect extends Component {
  @tracked selectedColorId = 2;

  select = (event) => (this.selectedColorId = event.target.value);

  isSelected = (colorId) => this.selectedColorId === colorId;

  colors = [
    { id: 1, text: "red" },
    { id: 2, text: "blue" },
    { id: 3, text: "green" },
    { id: 4, text: "gray", isDisabled: true },
  ];

  <template>
    <select {{on "change" this.select}}>
      {{#each this.colors as |color|}}
        <option
          value={{color.id}}
          disabled={{color.isDisabled}}
          selected={{this.isSelected color.id}}
        >
          {{color.text}}
        </option>
      {{/each}}
    </select>
  </template>
}

Aurelia 1

<template>
  <select value.bind="selectedColorId">
    <option value="">Select A Color</option>
    <option
      repeat.for="color of colors"
      value.bind="color.id"
      disabled.bind="color.isDisabled"
    >
      ${color.text}
    </option>
  </select>
</template>

Performance and Bundle Size

Ember Polaris

  • Optimized compilation with Glimmer VM
  • Smaller bundle size compared to classic Ember
  • Efficient DOM updates
  • Built-in development tools

Aurelia 1

  • Lightweight and modular architecture
  • Convention over configuration
  • Efficient data binding system
  • Minimal framework overhead

Learning Curve

Ember Polaris

  • Steeper learning curve due to Ember conventions
  • Strong documentation and community support
  • Comprehensive tooling ecosystem
  • Requires understanding of decorators and Glimmer components

Aurelia 1

  • Gentle learning curve
  • Familiar to developers with vanilla JavaScript experience
  • Convention-based approach makes common patterns easy
  • Strong documentation but smaller community

Conclusion

Choose Ember Polaris if you:

  • Need a full-featured, opinionated framework
  • Want strong conventions and tooling
  • Are building large, complex applications
  • Value stability and long-term support
  • Need comprehensive build tools and development features

Choose Aurelia 1 if you:

  • Prefer convention over configuration
  • Want a more lightweight framework
  • Need strong data binding capabilities
  • Value standards compliance
  • Are building medium-sized applications
  • Want a gentler learning curve

Both frameworks excel in different scenarios:

  • Ember Polaris is excellent for large, complex applications that benefit from strong conventions and comprehensive tooling
  • Aurelia 1 shines in scenarios where you need a lightweight, standards-compliant framework with powerful data binding

The choice between Ember Polaris and Aurelia 1 often depends on your specific needs:

  • Use Ember Polaris for enterprise applications that need strong conventions and tooling
  • Use Aurelia 1 for applications that need a lightweight framework with powerful data binding capabilities





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