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https://github.com/github/details-menu-element
A menu opened with <details>.
https://github.com/github/details-menu-element
custom-elements web-components
Last synced: 4 months ago
JSON representation
A menu opened with <details>.
- Host: GitHub
- URL: https://github.com/github/details-menu-element
- Owner: github
- License: mit
- Created: 2018-06-27T21:48:29.000Z (about 6 years ago)
- Default Branch: main
- Last Pushed: 2024-01-10T01:56:34.000Z (6 months ago)
- Last Synced: 2024-02-16T06:20:26.876Z (5 months ago)
- Topics: custom-elements, web-components
- Language: JavaScript
- Homepage: https://github.github.io/details-menu-element/examples
- Size: 1.24 MB
- Stars: 570
- Watchers: 196
- Forks: 48
- Open Issues: 8
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Codeowners: CODEOWNERS
Lists
- awesome-standalones - `<details-menu>`
- awesome-stars - details-menu-element
README
# <details-menu> element
A menu that's opened with a <details> button.
## Installation
```
$ npm install @github/details-menu-element
```
## Usage
### Script
Import as a module:
```js
import '@github/details-menu-element'
```
With a script tag:
```html
```
### Markup
```html
<details>
<summary>Robots</summary>
<details-menu role="menu">
<button type="button" role="menuitem">Hubot</button>
<button type="button" role="menuitem">Bender</button>
<button type="button" role="menuitem">BB-8</button>
</details-menu>
</details>
```
Use `data-menu-button` and `data-menu-button-text` to update the button's text on menu item activation.
```html
<details>
<summary>Preferred robot: <span data-menu-button>None</span></summary>
<details-menu role="menu">
<button type="button" role="menuitem" data-menu-button-text>Hubot</button>
<button type="button" role="menuitem" data-menu-button-text>Bender</button>
<button type="button" role="menuitem" data-menu-button-text>BB-8</button>
</details-menu>
</details>
```
Use `data-menu-button` and `data-menu-button-contents` to update the button's HTML content on menu item activation.
```html
<details>
<summary>Preferred robot: <span data-menu-button>None</span></summary>
<details-menu role="menu">
<button type="button" role="menuitem" data-menu-button-contents><img src="hubot.png"> Hubot</button>
<button type="button" role="menuitem" data-menu-button-contents><img src="bender.png"> Bender</button>
<button type="button" role="menuitem" data-menu-button-contents><img src="bb8.png"> BB-8</button>
</details-menu>
</details>
```
Use `label[tabindex="0"][role=menuitemradio/menuitemcheckbox]` when dealing with radio and checkbox inputs menu items. Check states of the input element and the label will be synchronized.
```html
<details>
<summary>Preferred robot</summary>
<details-menu role="menu">
<label tabindex="0" role="menuitemradio">
<input type="radio" name="robot" value="Hubot"> Hubot
</label>
<label tabindex="0" role="menuitemradio">
<input type="radio" name="robot" value="Bender"> Bender
</label>
<label tabindex="0" role="menuitemradio">
<input type="radio" name="robot" value="BB-8"> BB-8
</label>
</details-menu>
</details>
```
### Events
- `details-menu-select` (cancelable) - fired on `<details-menu>` with `event.detail.relatedTarget` being the item to be selected.
- `details-menu-selected` - fired on `<details-menu>` with `event.detail.relatedTarget` being the item selected, after label is updated and menu is closed.
### Deferred loading
Menu content can be loaded from a server by embedding an
[`<include-fragment>`][fragment] element.
[fragment]: https://github.com/github/include-fragment-element/
```html
<details>
<summary>Robots</summary>
<details-menu src="/robots" preload>
<include-fragment>Loading…</include-fragment>
</details-menu>
</details>
```
The `src` attribute value is copied to the `<include-fragment>` the first
time the `<details>` button is toggled open, which starts the server fetch.
If the `preload` attribute is present, the server fetch will begin on mouse
hover over the `<details>` button, so the content may be loaded by the time
the menu is opened.
## Browser support
Browsers without native [custom element support][support] require a [polyfill][].
- Chrome
- Firefox
- Safari
- Microsoft Edge
[support]: https://caniuse.com/#feat=custom-elementsv1
[polyfill]: https://github.com/webcomponents/custom-elements
## Development
```
npm install
npm test
```
## License
Distributed under the MIT license. See LICENSE for details.