name : focus-trap.umd.min.js.map {"version":3,"file":"focus-trap.umd.min.js","sources":["../index.js"],"sourcesContent":["import { tabbable, focusable, isFocusable, isTabbable } from 'tabbable';\n\nconst activeFocusTraps = (function () {\n const trapQueue = [];\n return {\n activateTrap(trap) {\n if (trapQueue.length > 0) {\n const activeTrap = trapQueue[trapQueue.length - 1];\n if (activeTrap !== trap) {\n activeTrap.pause();\n }\n }\n\n const trapIndex = trapQueue.indexOf(trap);\n if (trapIndex === -1) {\n trapQueue.push(trap);\n } else {\n // move this existing trap to the front of the queue\n trapQueue.splice(trapIndex, 1);\n trapQueue.push(trap);\n }\n },\n\n deactivateTrap(trap) {\n const trapIndex = trapQueue.indexOf(trap);\n if (trapIndex !== -1) {\n trapQueue.splice(trapIndex, 1);\n }\n\n if (trapQueue.length > 0) {\n trapQueue[trapQueue.length - 1].unpause();\n }\n },\n };\n})();\n\nconst isSelectableInput = function (node) {\n return (\n node.tagName &&\n node.tagName.toLowerCase() === 'input' &&\n typeof node.select === 'function'\n );\n};\n\nconst isEscapeEvent = function (e) {\n return e.key === 'Escape' || e.key === 'Esc' || e.keyCode === 27;\n};\n\nconst isTabEvent = function (e) {\n return e.key === 'Tab' || e.keyCode === 9;\n};\n\nconst delay = function (fn) {\n return setTimeout(fn, 0);\n};\n\n// Array.find/findIndex() are not supported on IE; this replicates enough\n// of Array.findIndex() for our needs\nconst findIndex = function (arr, fn) {\n let idx = -1;\n\n arr.every(function (value, i) {\n if (fn(value)) {\n idx = i;\n return false; // break\n }\n\n return true; // next\n });\n\n return idx;\n};\n\n/**\n * Get an option's value when it could be a plain value, or a handler that provides\n * the value.\n * @param {*} value Option's value to check.\n * @param {...*} [params] Any parameters to pass to the handler, if `value` is a function.\n * @returns {*} The `value`, or the handler's returned value.\n */\nconst valueOrHandler = function (value, ...params) {\n return typeof value === 'function' ? value(...params) : value;\n};\n\nconst getActualTarget = function (event) {\n // NOTE: If the trap is _inside_ a shadow DOM, event.target will always be the\n // shadow host. However, event.target.composedPath() will be an array of\n // nodes \"clicked\" from inner-most (the actual element inside the shadow) to\n // outer-most (the host HTML document). If we have access to composedPath(),\n // then use its first element; otherwise, fall back to event.target (and\n // this only works for an _open_ shadow DOM; otherwise,\n // composedPath()[0] === event.target always).\n return event.target.shadowRoot && typeof event.composedPath === 'function'\n ? event.composedPath()[0]\n : event.target;\n};\n\nconst createFocusTrap = function (elements, userOptions) {\n // SSR: a live trap shouldn't be created in this type of environment so this\n // should be safe code to execute if the `document` option isn't specified\n const doc = userOptions?.document || document;\n\n const config = {\n returnFocusOnDeactivate: true,\n escapeDeactivates: true,\n delayInitialFocus: true,\n ...userOptions,\n };\n\n const state = {\n // containers given to createFocusTrap()\n // @type {Array<HTMLElement>}\n containers: [],\n\n // list of objects identifying tabbable nodes in `containers` in the trap\n // NOTE: it's possible that a group has no tabbable nodes if nodes get removed while the trap\n // is active, but the trap should never get to a state where there isn't at least one group\n // with at least one tabbable node in it (that would lead to an error condition that would\n // result in an error being thrown)\n // @type {Array<{\n // container: HTMLElement,\n // tabbableNodes: Array<HTMLElement>, // empty if none\n // focusableNodes: Array<HTMLElement>, // empty if none\n // firstTabbableNode: HTMLElement|null,\n // lastTabbableNode: HTMLElement|null,\n // nextTabbableNode: (node: HTMLElement, forward: boolean) => HTMLElement|undefined\n // }>}\n containerGroups: [], // same order/length as `containers` list\n\n // references to objects in `containerGroups`, but only those that actually have\n // tabbable nodes in them\n // NOTE: same order as `containers` and `containerGroups`, but __not necessarily__\n // the same length\n tabbableGroups: [],\n\n nodeFocusedBeforeActivation: null,\n mostRecentlyFocusedNode: null,\n active: false,\n paused: false,\n\n // timer ID for when delayInitialFocus is true and initial focus in this trap\n // has been delayed during activation\n delayInitialFocusTimer: undefined,\n };\n\n let trap; // eslint-disable-line prefer-const -- some private functions reference it, and its methods reference private functions, so we must declare here and define later\n\n /**\n * Gets a configuration option value.\n * @param {Object|undefined} configOverrideOptions If true, and option is defined in this set,\n * value will be taken from this object. Otherwise, value will be taken from base configuration.\n * @param {string} optionName Name of the option whose value is sought.\n * @param {string|undefined} [configOptionName] Name of option to use __instead of__ `optionName`\n * IIF `configOverrideOptions` is not defined. Otherwise, `optionName` is used.\n */\n const getOption = (configOverrideOptions, optionName, configOptionName) => {\n return configOverrideOptions &&\n configOverrideOptions[optionName] !== undefined\n ? configOverrideOptions[optionName]\n : config[configOptionName || optionName];\n };\n\n /**\n * Finds the index of the container that contains the element.\n * @param {HTMLElement} element\n * @returns {number} Index of the container in either `state.containers` or\n * `state.containerGroups` (the order/length of these lists are the same); -1\n * if the element isn't found.\n */\n const findContainerIndex = function (element) {\n // NOTE: search `containerGroups` because it's possible a group contains no tabbable\n // nodes, but still contains focusable nodes (e.g. if they all have `tabindex=-1`)\n // and we still need to find the element in there\n return state.containerGroups.findIndex(\n ({ container, tabbableNodes }) =>\n container.contains(element) ||\n // fall back to explicit tabbable search which will take into consideration any\n // web components if the `tabbableOptions.getShadowRoot` option was used for\n // the trap, enabling shadow DOM support in tabbable (`Node.contains()` doesn't\n // look inside web components even if open)\n tabbableNodes.find((node) => node === element)\n );\n };\n\n /**\n * Gets the node for the given option, which is expected to be an option that\n * can be either a DOM node, a string that is a selector to get a node, `false`\n * (if a node is explicitly NOT given), or a function that returns any of these\n * values.\n * @param {string} optionName\n * @returns {undefined | false | HTMLElement | SVGElement} Returns\n * `undefined` if the option is not specified; `false` if the option\n * resolved to `false` (node explicitly not given); otherwise, the resolved\n * DOM node.\n * @throws {Error} If the option is set, not `false`, and is not, or does not\n * resolve to a node.\n */\n const getNodeForOption = function (optionName, ...params) {\n let optionValue = config[optionName];\n\n if (typeof optionValue === 'function') {\n optionValue = optionValue(...params);\n }\n\n if (optionValue === true) {\n optionValue = undefined; // use default value\n }\n\n if (!optionValue) {\n if (optionValue === undefined || optionValue === false) {\n return optionValue;\n }\n // else, empty string (invalid), null (invalid), 0 (invalid)\n\n throw new Error(\n `\\`${optionName}\\` was specified but was not a node, or did not return a node`\n );\n }\n\n let node = optionValue; // could be HTMLElement, SVGElement, or non-empty string at this point\n\n if (typeof optionValue === 'string') {\n node = doc.querySelector(optionValue); // resolve to node, or null if fails\n if (!node) {\n throw new Error(\n `\\`${optionName}\\` as selector refers to no known node`\n );\n }\n }\n\n return node;\n };\n\n const getInitialFocusNode = function () {\n let node = getNodeForOption('initialFocus');\n\n // false explicitly indicates we want no initialFocus at all\n if (node === false) {\n return false;\n }\n\n if (node === undefined) {\n // option not specified: use fallback options\n if (findContainerIndex(doc.activeElement) >= 0) {\n node = doc.activeElement;\n } else {\n const firstTabbableGroup = state.tabbableGroups[0];\n const firstTabbableNode =\n firstTabbableGroup && firstTabbableGroup.firstTabbableNode;\n\n // NOTE: `fallbackFocus` option function cannot return `false` (not supported)\n node = firstTabbableNode || getNodeForOption('fallbackFocus');\n }\n }\n\n if (!node) {\n throw new Error(\n 'Your focus-trap needs to have at least one focusable element'\n );\n }\n\n return node;\n };\n\n const updateTabbableNodes = function () {\n state.containerGroups = state.containers.map((container) => {\n const tabbableNodes = tabbable(container, config.tabbableOptions);\n\n // NOTE: if we have tabbable nodes, we must have focusable nodes; focusable nodes\n // are a superset of tabbable nodes\n const focusableNodes = focusable(container, config.tabbableOptions);\n\n return {\n container,\n tabbableNodes,\n focusableNodes,\n firstTabbableNode: tabbableNodes.length > 0 ? tabbableNodes[0] : null,\n lastTabbableNode:\n tabbableNodes.length > 0\n ? tabbableNodes[tabbableNodes.length - 1]\n : null,\n\n /**\n * Finds the __tabbable__ node that follows the given node in the specified direction,\n * in this container, if any.\n * @param {HTMLElement} node\n * @param {boolean} [forward] True if going in forward tab order; false if going\n * in reverse.\n * @returns {HTMLElement|undefined} The next tabbable node, if any.\n */\n nextTabbableNode(node, forward = true) {\n // NOTE: If tabindex is positive (in order to manipulate the tab order separate\n // from the DOM order), this __will not work__ because the list of focusableNodes,\n // while it contains tabbable nodes, does not sort its nodes in any order other\n // than DOM order, because it can't: Where would you place focusable (but not\n // tabbable) nodes in that order? They have no order, because they aren't tabbale...\n // Support for positive tabindex is already broken and hard to manage (possibly\n // not supportable, TBD), so this isn't going to make things worse than they\n // already are, and at least makes things better for the majority of cases where\n // tabindex is either 0/unset or negative.\n // FYI, positive tabindex issue: https://github.com/focus-trap/focus-trap/issues/375\n const nodeIdx = focusableNodes.findIndex((n) => n === node);\n if (nodeIdx < 0) {\n return undefined;\n }\n\n if (forward) {\n return focusableNodes\n .slice(nodeIdx + 1)\n .find((n) => isTabbable(n, config.tabbableOptions));\n }\n\n return focusableNodes\n .slice(0, nodeIdx)\n .reverse()\n .find((n) => isTabbable(n, config.tabbableOptions));\n },\n };\n });\n\n state.tabbableGroups = state.containerGroups.filter(\n (group) => group.tabbableNodes.length > 0\n );\n\n // throw if no groups have tabbable nodes and we don't have a fallback focus node either\n if (\n state.tabbableGroups.length <= 0 &&\n !getNodeForOption('fallbackFocus') // returning false not supported for this option\n ) {\n throw new Error(\n 'Your focus-trap must have at least one container with at least one tabbable node in it at all times'\n );\n }\n };\n\n const tryFocus = function (node) {\n if (node === false) {\n return;\n }\n\n if (node === doc.activeElement) {\n return;\n }\n\n if (!node || !node.focus) {\n tryFocus(getInitialFocusNode());\n return;\n }\n\n node.focus({ preventScroll: !!config.preventScroll });\n state.mostRecentlyFocusedNode = node;\n\n if (isSelectableInput(node)) {\n node.select();\n }\n };\n\n const getReturnFocusNode = function (previousActiveElement) {\n const node = getNodeForOption('setReturnFocus', previousActiveElement);\n return node ? node : node === false ? false : previousActiveElement;\n };\n\n // This needs to be done on mousedown and touchstart instead of click\n // so that it precedes the focus event.\n const checkPointerDown = function (e) {\n const target = getActualTarget(e);\n\n if (findContainerIndex(target) >= 0) {\n // allow the click since it ocurred inside the trap\n return;\n }\n\n if (valueOrHandler(config.clickOutsideDeactivates, e)) {\n // immediately deactivate the trap\n trap.deactivate({\n // if, on deactivation, we should return focus to the node originally-focused\n // when the trap was activated (or the configured `setReturnFocus` node),\n // then assume it's also OK to return focus to the outside node that was\n // just clicked, causing deactivation, as long as that node is focusable;\n // if it isn't focusable, then return focus to the original node focused\n // on activation (or the configured `setReturnFocus` node)\n // NOTE: by setting `returnFocus: false`, deactivate() will do nothing,\n // which will result in the outside click setting focus to the node\n // that was clicked, whether it's focusable or not; by setting\n // `returnFocus: true`, we'll attempt to re-focus the node originally-focused\n // on activation (or the configured `setReturnFocus` node)\n returnFocus:\n config.returnFocusOnDeactivate &&\n !isFocusable(target, config.tabbableOptions),\n });\n return;\n }\n\n // This is needed for mobile devices.\n // (If we'll only let `click` events through,\n // then on mobile they will be blocked anyways if `touchstart` is blocked.)\n if (valueOrHandler(config.allowOutsideClick, e)) {\n // allow the click outside the trap to take place\n return;\n }\n\n // otherwise, prevent the click\n e.preventDefault();\n };\n\n // In case focus escapes the trap for some strange reason, pull it back in.\n const checkFocusIn = function (e) {\n const target = getActualTarget(e);\n const targetContained = findContainerIndex(target) >= 0;\n\n // In Firefox when you Tab out of an iframe the Document is briefly focused.\n if (targetContained || target instanceof Document) {\n if (targetContained) {\n state.mostRecentlyFocusedNode = target;\n }\n } else {\n // escaped! pull it back in to where it just left\n e.stopImmediatePropagation();\n tryFocus(state.mostRecentlyFocusedNode || getInitialFocusNode());\n }\n };\n\n // Hijack Tab events on the first and last focusable nodes of the trap,\n // in order to prevent focus from escaping. If it escapes for even a\n // moment it can end up scrolling the page and causing confusion so we\n // kind of need to capture the action at the keydown phase.\n const checkTab = function (e) {\n const target = getActualTarget(e);\n updateTabbableNodes();\n\n let destinationNode = null;\n\n if (state.tabbableGroups.length > 0) {\n // make sure the target is actually contained in a group\n // NOTE: the target may also be the container itself if it's focusable\n // with tabIndex='-1' and was given initial focus\n const containerIndex = findContainerIndex(target);\n const containerGroup =\n containerIndex >= 0 ? state.containerGroups[containerIndex] : undefined;\n\n if (containerIndex < 0) {\n // target not found in any group: quite possible focus has escaped the trap,\n // so bring it back in to...\n if (e.shiftKey) {\n // ...the last node in the last group\n destinationNode =\n state.tabbableGroups[state.tabbableGroups.length - 1]\n .lastTabbableNode;\n } else {\n // ...the first node in the first group\n destinationNode = state.tabbableGroups[0].firstTabbableNode;\n }\n } else if (e.shiftKey) {\n // REVERSE\n\n // is the target the first tabbable node in a group?\n let startOfGroupIndex = findIndex(\n state.tabbableGroups,\n ({ firstTabbableNode }) => target === firstTabbableNode\n );\n\n if (\n startOfGroupIndex < 0 &&\n (containerGroup.container === target ||\n (isFocusable(target, config.tabbableOptions) &&\n !isTabbable(target, config.tabbableOptions) &&\n !containerGroup.nextTabbableNode(target, false)))\n ) {\n // an exception case where the target is either the container itself, or\n // a non-tabbable node that was given focus (i.e. tabindex is negative\n // and user clicked on it or node was programmatically given focus)\n // and is not followed by any other tabbable node, in which\n // case, we should handle shift+tab as if focus were on the container's\n // first tabbable node, and go to the last tabbable node of the LAST group\n startOfGroupIndex = containerIndex;\n }\n\n if (startOfGroupIndex >= 0) {\n // YES: then shift+tab should go to the last tabbable node in the\n // previous group (and wrap around to the last tabbable node of\n // the LAST group if it's the first tabbable node of the FIRST group)\n const destinationGroupIndex =\n startOfGroupIndex === 0\n ? state.tabbableGroups.length - 1\n : startOfGroupIndex - 1;\n\n const destinationGroup = state.tabbableGroups[destinationGroupIndex];\n destinationNode = destinationGroup.lastTabbableNode;\n }\n } else {\n // FORWARD\n\n // is the target the last tabbable node in a group?\n let lastOfGroupIndex = findIndex(\n state.tabbableGroups,\n ({ lastTabbableNode }) => target === lastTabbableNode\n );\n\n if (\n lastOfGroupIndex < 0 &&\n (containerGroup.container === target ||\n (isFocusable(target, config.tabbableOptions) &&\n !isTabbable(target, config.tabbableOptions) &&\n !containerGroup.nextTabbableNode(target)))\n ) {\n // an exception case where the target is the container itself, or\n // a non-tabbable node that was given focus (i.e. tabindex is negative\n // and user clicked on it or node was programmatically given focus)\n // and is not followed by any other tabbable node, in which\n // case, we should handle tab as if focus were on the container's\n // last tabbable node, and go to the first tabbable node of the FIRST group\n lastOfGroupIndex = containerIndex;\n }\n\n if (lastOfGroupIndex >= 0) {\n // YES: then tab should go to the first tabbable node in the next\n // group (and wrap around to the first tabbable node of the FIRST\n // group if it's the last tabbable node of the LAST group)\n const destinationGroupIndex =\n lastOfGroupIndex === state.tabbableGroups.length - 1\n ? 0\n : lastOfGroupIndex + 1;\n\n const destinationGroup = state.tabbableGroups[destinationGroupIndex];\n destinationNode = destinationGroup.firstTabbableNode;\n }\n }\n } else {\n // NOTE: the fallbackFocus option does not support returning false to opt-out\n destinationNode = getNodeForOption('fallbackFocus');\n }\n\n if (destinationNode) {\n e.preventDefault();\n tryFocus(destinationNode);\n }\n // else, let the browser take care of [shift+]tab and move the focus\n };\n\n const checkKey = function (e) {\n if (\n isEscapeEvent(e) &&\n valueOrHandler(config.escapeDeactivates, e) !== false\n ) {\n e.preventDefault();\n trap.deactivate();\n return;\n }\n\n if (isTabEvent(e)) {\n checkTab(e);\n return;\n }\n };\n\n const checkClick = function (e) {\n const target = getActualTarget(e);\n\n if (findContainerIndex(target) >= 0) {\n return;\n }\n\n if (valueOrHandler(config.clickOutsideDeactivates, e)) {\n return;\n }\n\n if (valueOrHandler(config.allowOutsideClick, e)) {\n return;\n }\n\n e.preventDefault();\n e.stopImmediatePropagation();\n };\n\n //\n // EVENT LISTENERS\n //\n\n const addListeners = function () {\n if (!state.active) {\n return;\n }\n\n // There can be only one listening focus trap at a time\n activeFocusTraps.activateTrap(trap);\n\n // Delay ensures that the focused element doesn't capture the event\n // that caused the focus trap activation.\n state.delayInitialFocusTimer = config.delayInitialFocus\n ? delay(function () {\n tryFocus(getInitialFocusNode());\n })\n : tryFocus(getInitialFocusNode());\n\n doc.addEventListener('focusin', checkFocusIn, true);\n doc.addEventListener('mousedown', checkPointerDown, {\n capture: true,\n passive: false,\n });\n doc.addEventListener('touchstart', checkPointerDown, {\n capture: true,\n passive: false,\n });\n doc.addEventListener('click', checkClick, {\n capture: true,\n passive: false,\n });\n doc.addEventListener('keydown', checkKey, {\n capture: true,\n passive: false,\n });\n\n return trap;\n };\n\n const removeListeners = function () {\n if (!state.active) {\n return;\n }\n\n doc.removeEventListener('focusin', checkFocusIn, true);\n doc.removeEventListener('mousedown', checkPointerDown, true);\n doc.removeEventListener('touchstart', checkPointerDown, true);\n doc.removeEventListener('click', checkClick, true);\n doc.removeEventListener('keydown', checkKey, true);\n\n return trap;\n };\n\n //\n // TRAP DEFINITION\n //\n\n trap = {\n get active() {\n return state.active;\n },\n\n get paused() {\n return state.paused;\n },\n\n activate(activateOptions) {\n if (state.active) {\n return this;\n }\n\n const onActivate = getOption(activateOptions, 'onActivate');\n const onPostActivate = getOption(activateOptions, 'onPostActivate');\n const checkCanFocusTrap = getOption(activateOptions, 'checkCanFocusTrap');\n\n if (!checkCanFocusTrap) {\n updateTabbableNodes();\n }\n\n state.active = true;\n state.paused = false;\n state.nodeFocusedBeforeActivation = doc.activeElement;\n\n if (onActivate) {\n onActivate();\n }\n\n const finishActivation = () => {\n if (checkCanFocusTrap) {\n updateTabbableNodes();\n }\n addListeners();\n if (onPostActivate) {\n onPostActivate();\n }\n };\n\n if (checkCanFocusTrap) {\n checkCanFocusTrap(state.containers.concat()).then(\n finishActivation,\n finishActivation\n );\n return this;\n }\n\n finishActivation();\n return this;\n },\n\n deactivate(deactivateOptions) {\n if (!state.active) {\n return this;\n }\n\n const options = {\n onDeactivate: config.onDeactivate,\n onPostDeactivate: config.onPostDeactivate,\n checkCanReturnFocus: config.checkCanReturnFocus,\n ...deactivateOptions,\n };\n\n clearTimeout(state.delayInitialFocusTimer); // noop if undefined\n state.delayInitialFocusTimer = undefined;\n\n removeListeners();\n state.active = false;\n state.paused = false;\n\n activeFocusTraps.deactivateTrap(trap);\n\n const onDeactivate = getOption(options, 'onDeactivate');\n const onPostDeactivate = getOption(options, 'onPostDeactivate');\n const checkCanReturnFocus = getOption(options, 'checkCanReturnFocus');\n const returnFocus = getOption(\n options,\n 'returnFocus',\n 'returnFocusOnDeactivate'\n );\n\n if (onDeactivate) {\n onDeactivate();\n }\n\n const finishDeactivation = () => {\n delay(() => {\n if (returnFocus) {\n tryFocus(getReturnFocusNode(state.nodeFocusedBeforeActivation));\n }\n if (onPostDeactivate) {\n onPostDeactivate();\n }\n });\n };\n\n if (returnFocus && checkCanReturnFocus) {\n checkCanReturnFocus(\n getReturnFocusNode(state.nodeFocusedBeforeActivation)\n ).then(finishDeactivation, finishDeactivation);\n return this;\n }\n\n finishDeactivation();\n return this;\n },\n\n pause() {\n if (state.paused || !state.active) {\n return this;\n }\n\n state.paused = true;\n removeListeners();\n\n return this;\n },\n\n unpause() {\n if (!state.paused || !state.active) {\n return this;\n }\n\n state.paused = false;\n updateTabbableNodes();\n addListeners();\n\n return this;\n },\n\n updateContainerElements(containerElements) {\n const elementsAsArray = [].concat(containerElements).filter(Boolean);\n\n state.containers = elementsAsArray.map((element) =>\n typeof element === 'string' ? doc.querySelector(element) : element\n );\n\n if (state.active) {\n updateTabbableNodes();\n }\n\n return this;\n },\n };\n\n // initialize container elements\n trap.updateContainerElements(elements);\n\n return trap;\n};\n\nexport { createFocusTrap 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