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Improve accessibility of toot dropdown menu

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* Prevent Enter keypresses from triggering dropdown display toggle twice
* Give focus to first/selected item of dropdown menus
* Implement keyboard navigation in generic dropdown menus

Partial port from ef7d64c801 to glitch-soc
This commit is contained in:
Thibaut Girka 2018-05-05 17:11:48 +02:00
parent cb62935c0b
commit cee157fc19
1 changed files with 42 additions and 4 deletions
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46
app/javascript/flavours/glitch/components/dropdown_menu.js
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@ -43,6 +43,7 @@ class DropdownMenu extends React.PureComponent {
componentDidMount () {
document.addEventListener('click', this.handleDocumentClick, false);
document.addEventListener('touchend', this.handleDocumentClick, listenerOptions);
if (this.focusedItem) this.focusedItem.focus();
this.setState({ mounted: true });
}
@ -55,6 +56,46 @@ class DropdownMenu extends React.PureComponent {
this.node = c;
}
setFocusRef = c => {
this.focusedItem = c;
}
handleKeyDown = e => {
const items = Array.from(this.node.getElementsByTagName('a'));
const index = items.indexOf(e.currentTarget);
let element;
switch(e.key) {
case 'Enter':
this.handleClick(e);
break;
case 'ArrowDown':
element = items[index+1];
if (element) {
element.focus();
}
break;
case 'ArrowUp':
element = items[index-1];
if (element) {
element.focus();
}
break;
case 'Home':
element = items[0];
if (element) {
element.focus();
}
break;
case 'End':
element = items[items.length-1];
if (element) {
element.focus();
}
break;
}
}
handleClick = e => {
const i = Number(e.currentTarget.getAttribute('data-index'));
const { action, to } = this.props.items[i];
@ -79,7 +120,7 @@ class DropdownMenu extends React.PureComponent {
return (
<li className='dropdown-menu__item' key={`${text}-${i}`}>
<a href={href} target='_blank' rel='noopener' role='button' tabIndex='0' autoFocus={i === 0} onClick={this.handleClick} data-index={i}>
<a href={href} target='_blank' rel='noopener' role='button' tabIndex='0' ref={i === 0 ? this.setFocusRef : null} onClick={this.handleClick} onKeyDown={this.handleKeyDown} data-index={i}>
{text}
</a>
</li>
@ -156,9 +197,6 @@ export default class Dropdown extends React.PureComponent {
handleKeyDown = e => {
switch(e.key) {
case 'Enter':
this.handleClick(e);
break;
case 'Escape':
this.handleClose();
break;