97 lines
3.3 KiB
Plaintext
97 lines
3.3 KiB
Plaintext
# aria-menu
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Modifier based `{{aria-menu}}` helper based on GitHub top menu keyboard interactions.
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Functionality is based on a11y focussed keyboard navigation of aria menus and currently only supports vertical-like navigation (but feel free to add horizontal, it should be straight forwards.
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Features:
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- `Enter`/`Space` to open the menu and immediately focus the first item
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- Click to open the menu but _not_ focus the first item
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- `Escape` to close the menu and focus the original trigger (`aria-labelledby`)
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- When open, arrow keys will cycle through the menu items, and therefore not leave the menu.
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- When open, tabbing through the menu items will _not_ cycle but instead return to the natural DOM tabbing flow once the start/end is reached.
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ARIA attributes are not automatically added for you and you should make use of `role="menu"`, `role="menuitem"`, `role="none"` and `role="separator"` (if required). You should also take care to use the `aria-labelledby` attribute along with a correct `id` attribute on the trigger for the menu.
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You should also take care to use `aria-haspopup="menu"` and `aria-controls="id"` if required. BUt only if you require the additional disclosure type functionality. These additional aria attributes are not functionally relevant to `{{aria-menu}}` itself.
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Clicking outside will _not_ close the menu by default, if you require this functionality please combine with our `{{on-outside 'click'}}` modifier (see example).
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In the example below, the Before Trigger and After Trigger don't do anything, they are only there to demonstrate tabbing functionality with natural DOM tabbing order.
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```hbs preview-template
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<div
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style={{style-map
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(array 'display' 'flex')
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}}
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>
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<button
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type="button"
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>
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Before trigger
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</button>
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<div
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style={{style-map
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(array 'position' 'relative')
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}}
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>
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<button
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{{on 'click'
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(queue
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(set this 'event')
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(set this 'open' (not this.open))
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)
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}}
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id="trigger"
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type="button"
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aria-haspopup="menu"
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aria-controls="menu-id"
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>
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Trigger
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</button>
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{{#if this.open}}
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<ul
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id="menu-id"
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style={{style-map
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(array 'position' 'absolute')
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(array 'padding' '1rem')
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(array 'border' '1px solid var(--token-color-foreground-faint)')
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(array 'top' '2rem')
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(array 'background-color' 'var(--token-color-surface-primary)')
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}}
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role="menu"
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aria-labelledby="trigger"
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{{on-outside 'click' (set this 'open' false)}}
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{{aria-menu
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openEvent=this.event
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onclose=(set this 'open' false)
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}}
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>
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<li role="none">
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<button type="button" role="menuitem">Item 1</button>
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</li>
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<li role="none">
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<button type="button" role="menuitem">Item 2</button>
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</li>
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<li role="none">
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<button type="button" role="menuitem">Item 3</button>
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</li>
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</ul>
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{{/if}}
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</div>
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<button
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type="button"
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>
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After trigger
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</button>
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</div>
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```
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## Named Arguments
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| Argument | Type | Default | Description |
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| --- | --- | --- | --- |
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| `openEvent` | `Event` | | The Event used to open the menu, if `pointerType` is empty the first menu element is focussed when open |
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| `onclose` | `function` | | A callback called when the menu is closed |
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