README
vanilla-hamburger is a port of hamburger-react to vanilla Custom Elements.
Features
- Small: Just 1,8 KB (minified and gzipped). Size Limit controls the size.
- Fast: Built with standards based Custom Elements.
- Bulletproof: Written in strict TypeScript and covered by 30+ tests.
- Framework-agnostic: Can be used with any framework.
- Simple: Uses native
<button>
with aclick
listener internally. - Accessible: Follows WAI-ARIA guidelines for toggle buttons.
- No dependencies
Live demo
Installation
npm install vanilla-hamburger --save
Or use one of the following content delivery networks:
<script type="module" src="https://unpkg.com/vanilla-hamburger?module"></script>
<script type="module" src="https://cdn.skypack.dev/vanilla-hamburger"></script>
Usage
<tilt-burger size="lg" label="Menu"></tilt-burger>
<script type="module">
import 'vanilla-hamburger';
const burger = document.querySelector('tilt-burger');
burger.addEventListener('pressed-changed', (event) => {
const pressed = event.detail.value;
});
</script>
ES modules
vanilla-hamburger is authored using ES modules which are natively supported by modern browsers. However, it also uses "bare module imports" which are not yet standardized and require a small transform.
We recommend the following tools for the ES modules based development:
@web/dev-server
resolves bare module imports on the fly.snowpack
performs one-time transform when installing dependencies.@rollup/plugin-node-resolve
is needed when using Rollup.
None of these tools are needed when importing the component from CDN.
Available variants
vanilla-hamburger provides 13 separate elements for different hamburger types.
File to import | HTML element |
---|---|
"cross-burger.js" |
<cross-burger> |
"fade-burger.js" |
<fade-burger> |
"pivot-burger.js" |
<pivot-burger> |
"rotate-burger.js" |
<rotate-burger> |
"slant-burger.js" |
<slant-burger> |
"sling-burger.js" |
<sling-burger> |
"spin-burger.js" |
<spin-burger> |
"spiral-burger.js" |
<spiral-burger> |
"squash-burger.js" |
<squash-burger> |
"squeeze-burger.js" |
<squeeze-burger> |
"tilt-burger.js" |
<tilt-burger> |
"turn-burger.js" |
<turn-burger> |
"twirl-burger.js" |
<twirl-burger> |
When using one hamburger, ~1.8 KB will be added to your bundle (min + gzip).
Properties
The following properties can be used to customize hamburger elements:
Property | Default | Description |
---|---|---|
direction |
left |
The animation direction of the icon, left or right. |
disabled |
false |
When set to true, the internal <button> id disabled. |
distance |
md |
The distance between the lines: sm , md or lg . |
duration |
0.4 |
The duration of the animation. Can be set to zero. |
easing |
cubic-bezier(0, 0, 0, 1) |
A valid transition-timing-function CSS value. |
label |
hamburger |
Accessible label set on the internal <button> . |
pressed |
false |
Set to true when element is pressed. |
size |
32 |
Size of the icon. Should be a number between 12 and 48. |
Note: direction
property is not supported by <squash-burger>
and <squeeze-burger>
.
Overriding styles
vanilla-hamburger exposes CSS Shadow Parts allowing to override the default styles:
cross-burger {
color: #999;
}
cross-burger[pressed] {
color: #666;
}
cross-burger[disabled] {
opacity: 0.7;
}
cross-burger::part(bar) {
border-radius: 9em;
}
cross-burger::part(button) {
outline: none;
background: currentColor;
border-radius: 50%;
opacity: 0;
transition: opacity 0.5s;
}
cross-burger::part(button):hover {
opacity: 0.12;
}
cross-burger::part(button):focus {
opacity: 0.16;
}
Base classes
vanilla-hamburger provides a set of base classes that can be imported without registering custom elements. This is useful if you want to create your own hamburger icon with a different tag name.
import { Cross } from 'vanilla-hamburger/lib/entrypoints/cross.js';
customElements.define('custom-burger', class extends Cross {});
Accessibility
It is recommended to have a tap/click area of at least 48x48 pixels. Therefore, padding will be added around the icon to create a surface of exactly this size.
Keyboard interaction is provided using native <button>
, which dispatches the click
event on
Enter and Space keys. The underlying native button has aria-pressed
attribute
set based on the pressed
property.
Remember to use label
property to provide an accessible label for the native button.
TypeScript support
vanilla-hamburger supports TypeScript and ships with types in the library itself; no need for any other install.
All the included custom elements are compatible with lit-analyzer and lit-plugin extension for Visual Studio Code, so you can benefit from type checking in lit-html templates.
Browser support
vanilla-hamburger uses Custom Elements and Shadow DOM, and does not support IE11 or legacy Edge.
Why vanilla-hamburger?
vanilla-hamburger has all the benefits of hamburger-react with one important difference.
While hamburger-react
does not have direct dependencies, it still expects you to use React. This
means that Angular, Vue, Svelte or vanilla JS users would have an extra dependency in their apps.
Now when all the evergreen browsers support standards based Custom Elements, it's perfect time to build such tiny and lightweight UI controls as web components rather than framework components.