Displaying the Keys in an Object

If you need to display all of the keys or values of a JavaScript object in your template, you can use the {{#each-in}} helper:

import Component from '@ember/component';

export default Component.extend({
  willRender() {
    // Set the "categories" property to a JavaScript object
    // with the category name as the key and the value a list
    // of products.
    this.set('categories', {
      'Bourbons': ['Bulleit', 'Four Roses', 'Woodford Reserve'],
      'Ryes': ['WhistlePig', 'High West']
    });
  }
});

<ul>
  {{#each-in this.categories as |category products|}}
    <li>{{category}}
      <ol>
        {{#each products as |product|}}
          <li>{{product}}</li>
        {{/each}}
      </ol>
    </li>
  {{/each-in}}
</ul>

The template inside of the {{#each-in}} block is repeated once for each key in the passed object. The first block parameter (category in the above example) is the key for this iteration, while the second block parameter (products) is the actual value of that key.

The above example will print a list like this:

<ul>
  <li>Bourbons
    <ol>
      <li>Bulleit</li>
      <li>Four Roses</li>
      <li>Woodford Reserve</li>
    </ol>
  </li>
  <li>Ryes
    <ol>
      <li>WhistlePig</li>
      <li>High West</li>
    </ol>
  </li>
</ul>

Ordering

Empty Lists

{{#each-in this.people as |name person|}}
  Hello, {{name}}! You are {{person.age}} years old.
{{else}}
  Sorry, nobody is here.
{{/each-in}}