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FocusTrap.js
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Tue, Jul 1, 02:38

FocusTrap.js
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/* eslint-disable consistent-return, jsx-a11y/no-noninteractive-tabindex */
import * as React from 'react';
import PropTypes from 'prop-types';
import { exactProp, elementAcceptingRef, unstable_useForkRef as useForkRef, unstable_ownerDocument as ownerDocument } from '@mui/utils';
import { jsx as _jsx } from "react/jsx-runtime";
import { jsxs as _jsxs } from "react/jsx-runtime";
// Inspired by https://github.com/focus-trap/tabbable
const candidatesSelector = ['input', 'select', 'textarea', 'a[href]', 'button', '[tabindex]', 'audio[controls]', 'video[controls]', '[contenteditable]:not([contenteditable="false"])'].join(',');
function getTabIndex(node) {
const tabindexAttr = parseInt(node.getAttribute('tabindex') || '', 10);
if (!Number.isNaN(tabindexAttr)) {
return tabindexAttr;
}
// Browsers do not return `tabIndex` correctly for contentEditable nodes;
// https://bugs.chromium.org/p/chromium/issues/detail?id=661108&q=contenteditable%20tabindex&can=2
// so if they don't have a tabindex attribute specifically set, assume it's 0.
// in Chrome, <details/>, <audio controls/> and <video controls/> elements get a default
// `tabIndex` of -1 when the 'tabindex' attribute isn't specified in the DOM,
// yet they are still part of the regular tab order; in FF, they get a default
// `tabIndex` of 0; since Chrome still puts those elements in the regular tab
// order, consider their tab index to be 0.
if (node.contentEditable === 'true' || (node.nodeName === 'AUDIO' || node.nodeName === 'VIDEO' || node.nodeName === 'DETAILS') && node.getAttribute('tabindex') === null) {
return 0;
}
return node.tabIndex;
}
function isNonTabbableRadio(node) {
if (node.tagName !== 'INPUT' || node.type !== 'radio') {
return false;
}
if (!node.name) {
return false;
}
const getRadio = selector => node.ownerDocument.querySelector(`input[type="radio"]${selector}`);
let roving = getRadio(`[name="${node.name}"]:checked`);
if (!roving) {
roving = getRadio(`[name="${node.name}"]`);
}
return roving !== node;
}
function isNodeMatchingSelectorFocusable(node) {
if (node.disabled || node.tagName === 'INPUT' && node.type === 'hidden' || isNonTabbableRadio(node)) {
return false;
}
return true;
}
function defaultGetTabbable(root) {
const regularTabNodes = [];
const orderedTabNodes = [];
Array.from(root.querySelectorAll(candidatesSelector)).forEach((node, i) => {
const nodeTabIndex = getTabIndex(node);
if (nodeTabIndex === -1 || !isNodeMatchingSelectorFocusable(node)) {
return;
}
if (nodeTabIndex === 0) {
regularTabNodes.push(node);
} else {
orderedTabNodes.push({
documentOrder: i,
tabIndex: nodeTabIndex,
node: node
});
}
});
return orderedTabNodes.sort((a, b) => a.tabIndex === b.tabIndex ? a.documentOrder - b.documentOrder : a.tabIndex - b.tabIndex).map(a => a.node).concat(regularTabNodes);
}
function defaultIsEnabled() {
return true;
}
/**
* Utility component that locks focus inside the component.
*
* Demos:
*
* - [Focus Trap](https://mui.com/base/react-focus-trap/)
*
* API:
*
* - [FocusTrap API](https://mui.com/base/api/focus-trap/)
*/
function FocusTrap(props) {
const {
children,
disableAutoFocus = false,
disableEnforceFocus = false,
disableRestoreFocus = false,
getTabbable = defaultGetTabbable,
isEnabled = defaultIsEnabled,
open
} = props;
const ignoreNextEnforceFocus = React.useRef(false);
const sentinelStart = React.useRef(null);
const sentinelEnd = React.useRef(null);
const nodeToRestore = React.useRef(null);
const reactFocusEventTarget = React.useRef(null);
// This variable is useful when disableAutoFocus is true.
// It waits for the active element to move into the component to activate.
const activated = React.useRef(false);
const rootRef = React.useRef(null);
// @ts-expect-error TODO upstream fix
const handleRef = useForkRef(children.ref, rootRef);
const lastKeydown = React.useRef(null);
React.useEffect(() => {
// We might render an empty child.
if (!open || !rootRef.current) {
return;
}
activated.current = !disableAutoFocus;
}, [disableAutoFocus, open]);
React.useEffect(() => {
// We might render an empty child.
if (!open || !rootRef.current) {
return;
}
const doc = ownerDocument(rootRef.current);
if (!rootRef.current.contains(doc.activeElement)) {
if (!rootRef.current.hasAttribute('tabIndex')) {
if (process.env.NODE_ENV !== 'production') {
console.error(['MUI: The modal content node does not accept focus.', 'For the benefit of assistive technologies, ' + 'the tabIndex of the node is being set to "-1".'].join('\n'));
}
rootRef.current.setAttribute('tabIndex', '-1');
}
if (activated.current) {
rootRef.current.focus();
}
}
return () => {
// restoreLastFocus()
if (!disableRestoreFocus) {
// In IE11 it is possible for document.activeElement to be null resulting
// in nodeToRestore.current being null.
// Not all elements in IE11 have a focus method.
// Once IE11 support is dropped the focus() call can be unconditional.
if (nodeToRestore.current && nodeToRestore.current.focus) {
ignoreNextEnforceFocus.current = true;
nodeToRestore.current.focus();
}
nodeToRestore.current = null;
}
};
// Missing `disableRestoreFocus` which is fine.
// We don't support changing that prop on an open FocusTrap
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [open]);
React.useEffect(() => {
// We might render an empty child.
if (!open || !rootRef.current) {
return;
}
const doc = ownerDocument(rootRef.current);
const contain = nativeEvent => {
const {
current: rootElement
} = rootRef;
// Cleanup functions are executed lazily in React 17.
// Contain can be called between the component being unmounted and its cleanup function being run.
if (rootElement === null) {
return;
}
if (!doc.hasFocus() || disableEnforceFocus || !isEnabled() || ignoreNextEnforceFocus.current) {
ignoreNextEnforceFocus.current = false;
return;
}
if (!rootElement.contains(doc.activeElement)) {
// if the focus event is not coming from inside the children's react tree, reset the refs
if (nativeEvent && reactFocusEventTarget.current !== nativeEvent.target || doc.activeElement !== reactFocusEventTarget.current) {
reactFocusEventTarget.current = null;
} else if (reactFocusEventTarget.current !== null) {
return;
}
if (!activated.current) {
return;
}
let tabbable = [];
if (doc.activeElement === sentinelStart.current || doc.activeElement === sentinelEnd.current) {
tabbable = getTabbable(rootRef.current);
}
if (tabbable.length > 0) {
const isShiftTab = Boolean(lastKeydown.current?.shiftKey && lastKeydown.current?.key === 'Tab');
const focusNext = tabbable[0];
const focusPrevious = tabbable[tabbable.length - 1];
if (typeof focusNext !== 'string' && typeof focusPrevious !== 'string') {
if (isShiftTab) {
focusPrevious.focus();
} else {
focusNext.focus();
}
}
} else {
rootElement.focus();
}
}
};
const loopFocus = nativeEvent => {
lastKeydown.current = nativeEvent;
if (disableEnforceFocus || !isEnabled() || nativeEvent.key !== 'Tab') {
return;
}
// Make sure the next tab starts from the right place.
// doc.activeElement referes to the origin.
if (doc.activeElement === rootRef.current && nativeEvent.shiftKey) {
// We need to ignore the next contain as
// it will try to move the focus back to the rootRef element.
ignoreNextEnforceFocus.current = true;
if (sentinelEnd.current) {
sentinelEnd.current.focus();
}
}
};
doc.addEventListener('focusin', contain);
doc.addEventListener('keydown', loopFocus, true);
// With Edge, Safari and Firefox, no focus related events are fired when the focused area stops being a focused area.
// e.g. https://bugzilla.mozilla.org/show_bug.cgi?id=559561.
// Instead, we can look if the active element was restored on the BODY element.
//
// The whatwg spec defines how the browser should behave but does not explicitly mention any events:
// https://html.spec.whatwg.org/multipage/interaction.html#focus-fixup-rule.
const interval = setInterval(() => {
if (doc.activeElement && doc.activeElement.tagName === 'BODY') {
contain(null);
}
}, 50);
return () => {
clearInterval(interval);
doc.removeEventListener('focusin', contain);
doc.removeEventListener('keydown', loopFocus, true);
};
}, [disableAutoFocus, disableEnforceFocus, disableRestoreFocus, isEnabled, open, getTabbable]);
const onFocus = event => {
if (nodeToRestore.current === null) {
nodeToRestore.current = event.relatedTarget;
}
activated.current = true;
reactFocusEventTarget.current = event.target;
const childrenPropsHandler = children.props.onFocus;
if (childrenPropsHandler) {
childrenPropsHandler(event);
}
};
const handleFocusSentinel = event => {
if (nodeToRestore.current === null) {
nodeToRestore.current = event.relatedTarget;
}
activated.current = true;
};
return /*#__PURE__*/_jsxs(React.Fragment, {
children: [/*#__PURE__*/_jsx("div", {
tabIndex: open ? 0 : -1,
onFocus: handleFocusSentinel,
ref: sentinelStart,
"data-testid": "sentinelStart"
}), /*#__PURE__*/React.cloneElement(children, {
ref: handleRef,
onFocus
}), /*#__PURE__*/_jsx("div", {
tabIndex: open ? 0 : -1,
onFocus: handleFocusSentinel,
ref: sentinelEnd,
"data-testid": "sentinelEnd"
})]
});
}
process.env.NODE_ENV !== "production" ? FocusTrap.propTypes /* remove-proptypes */ = {
// ----------------------------- Warning --------------------------------
// | These PropTypes are generated from the TypeScript type definitions |
// | To update them edit TypeScript types and run "yarn proptypes" |
// ----------------------------------------------------------------------
/**
* A single child content element.
*/
children: elementAcceptingRef,
/**
* If `true`, the focus trap will not automatically shift focus to itself when it opens, and
* replace it to the last focused element when it closes.
* This also works correctly with any focus trap children that have the `disableAutoFocus` prop.
*
* Generally this should never be set to `true` as it makes the focus trap less
* accessible to assistive technologies, like screen readers.
* @default false
*/
disableAutoFocus: PropTypes.bool,
/**
* If `true`, the focus trap will not prevent focus from leaving the focus trap while open.
*
* Generally this should never be set to `true` as it makes the focus trap less
* accessible to assistive technologies, like screen readers.
* @default false
*/
disableEnforceFocus: PropTypes.bool,
/**
* If `true`, the focus trap will not restore focus to previously focused element once
* focus trap is hidden or unmounted.
* @default false
*/
disableRestoreFocus: PropTypes.bool,
/**
* Returns an array of ordered tabbable nodes (i.e. in tab order) within the root.
* For instance, you can provide the "tabbable" npm dependency.
* @param {HTMLElement} root
*/
getTabbable: PropTypes.func,
/**
* This prop extends the `open` prop.
* It allows to toggle the open state without having to wait for a rerender when changing the `open` prop.
* This prop should be memoized.
* It can be used to support multiple focus trap mounted at the same time.
* @default function defaultIsEnabled(): boolean {
* return true;
* }
*/
isEnabled: PropTypes.func,
/**
* If `true`, focus is locked.
*/
open: PropTypes.bool.isRequired
} : void 0;
if (process.env.NODE_ENV !== 'production') {
// eslint-disable-next-line
FocusTrap['propTypes' + ''] = exactProp(FocusTrap.propTypes);
}
export default FocusTrap;

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