diff --git a/lib/amd/build/local/aria/focuslock.min.js b/lib/amd/build/local/aria/focuslock.min.js index 6504a777b28..ca77ebc08f5 100644 --- a/lib/amd/build/local/aria/focuslock.min.js +++ b/lib/amd/build/local/aria/focuslock.min.js @@ -8,6 +8,6 @@ define("core/local/aria/focuslock",["exports","./selectors"],(function(_exports, * @module core/tablock * @copyright 2019 Andrew Nicols * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later - */Object.defineProperty(_exports,"__esModule",{value:!0}),_exports.untrapFocus=_exports.trapFocus=void 0,_selectors=(obj=_selectors)&&obj.__esModule?obj:{default:obj};const lockRegionStack=[],initialFocusElementStack=[],finalFocusElementStack=[];let lastFocus=null,ignoreFocusChanges=!1,isLocked=!1;const lockHandler=event=>{if(ignoreFocusChanges)return;const lockRegion=getCurrentLockRegion();lockRegion.parentNode||untrapFocus(),lockRegion.contains(event.target)?lastFocus=event.target:(focusFirstDescendant(),lastFocus==document.activeElement&&focusLastDescendant(),lastFocus=document.activeElement)},focusFirstDescendant=()=>{const lockRegion=getCurrentLockRegion(),focusableElements=Array.from(lockRegion.querySelectorAll(_selectors.default.elements.focusable));return focusableElements.unshift(lockRegion),focusableElements.some((focusableElement=>attemptFocus(focusableElement)))},focusLastDescendant=()=>{const lockRegion=getCurrentLockRegion(),focusableElements=Array.from(lockRegion.querySelectorAll(_selectors.default.elements.focusable)).reverse();return focusableElements.push(lockRegion),focusableElements.some((focusableElement=>attemptFocus(focusableElement)))},attemptFocus=focusTarget=>{if(!(focusTarget=>{if(focusTarget.tabIndex>0||0===focusTarget.tabIndex&&null!==focusTarget.getAttribute("tabIndex"))return!0;if(focusTarget.disabled)return!1;switch(focusTarget.nodeName){case"A":return!!focusTarget.href&&"ignore"!=focusTarget.rel;case"INPUT":return"hidden"!=focusTarget.type&&"file"!=focusTarget.type;case"BUTTON":case"SELECT":case"TEXTAREA":return!0;default:return!1}})(focusTarget))return!1;ignoreFocusChanges=!0;try{focusTarget.focus()}catch(e){}return ignoreFocusChanges=!1,document.activeElement===focusTarget},getCurrentLockRegion=()=>lockRegionStack[lockRegionStack.length-1];_exports.trapFocus=newLockRegion=>{if((newLockRegion=>{if(newLockRegion===getCurrentLockRegion())return;lockRegionStack.push(newLockRegion);const currentLockRegion=getCurrentLockRegion(),element=document.createElement("div");element.tabIndex=0,element.style.position="fixed",element.style.top=0,element.style.left=0;const initialNode=element.cloneNode();currentLockRegion.parentNode.insertBefore(initialNode,currentLockRegion),initialFocusElementStack.push(initialNode);const finalNode=element.cloneNode();currentLockRegion.parentNode.insertBefore(finalNode,currentLockRegion.nextSibling),finalFocusElementStack.push(finalNode)})(newLockRegion),isLocked||document.addEventListener("focus",lockHandler,!0),!focusFirstDescendant()){const currentLockRegion=getCurrentLockRegion(),originalRegionTabIndex=currentLockRegion.tabIndex;currentLockRegion.tabIndex=0,attemptFocus(currentLockRegion),currentLockRegion.tabIndex=originalRegionTabIndex}lastFocus=document.activeElement,isLocked=!0};const untrapFocus=()=>{(()=>{lockRegionStack.pop();const finalNode=finalFocusElementStack.pop();finalNode&&finalNode.remove();const initialNode=initialFocusElementStack.pop();initialNode&&initialNode.remove()})(),lockRegionStack.length||(document.removeEventListener("focus",lockHandler,!0),lastFocus=null,ignoreFocusChanges=!1,isLocked=!1)};_exports.untrapFocus=untrapFocus})); + */Object.defineProperty(_exports,"__esModule",{value:!0}),_exports.untrapFocus=_exports.trapFocus=void 0,_selectors=(obj=_selectors)&&obj.__esModule?obj:{default:obj};const lockRegionStack=[],initialFocusElementStack=[],finalFocusElementStack=[];let lastFocus=null,ignoreFocusChanges=!1,isLocked=!1;const lockHandler=event=>{if(ignoreFocusChanges)return;let lockRegion=getCurrentLockRegion();for(;lockRegion&&!document.contains(lockRegion);)untrapFocus(),lockRegion=getCurrentLockRegion();lockRegion&&(lockRegion.contains(event.target)?lastFocus=event.target:(focusFirstDescendant(),lastFocus==document.activeElement&&focusLastDescendant(),lastFocus=document.activeElement))},focusFirstDescendant=()=>{const lockRegion=getCurrentLockRegion(),focusableElements=Array.from(lockRegion.querySelectorAll(_selectors.default.elements.focusable));return focusableElements.unshift(lockRegion),focusableElements.some((focusableElement=>attemptFocus(focusableElement)))},focusLastDescendant=()=>{const lockRegion=getCurrentLockRegion(),focusableElements=Array.from(lockRegion.querySelectorAll(_selectors.default.elements.focusable)).reverse();return focusableElements.push(lockRegion),focusableElements.some((focusableElement=>attemptFocus(focusableElement)))},attemptFocus=focusTarget=>{if(!(focusTarget=>{if(focusTarget.tabIndex>0||0===focusTarget.tabIndex&&null!==focusTarget.getAttribute("tabIndex"))return!0;if(focusTarget.disabled)return!1;switch(focusTarget.nodeName){case"A":return!!focusTarget.href&&"ignore"!=focusTarget.rel;case"INPUT":return"hidden"!=focusTarget.type&&"file"!=focusTarget.type;case"BUTTON":case"SELECT":case"TEXTAREA":return!0;default:return!1}})(focusTarget))return!1;ignoreFocusChanges=!0;try{focusTarget.focus()}catch(e){}return ignoreFocusChanges=!1,document.activeElement===focusTarget},getCurrentLockRegion=()=>lockRegionStack[lockRegionStack.length-1];_exports.trapFocus=newLockRegion=>{if((newLockRegion=>{if(newLockRegion===getCurrentLockRegion())return;lockRegionStack.push(newLockRegion);const currentLockRegion=getCurrentLockRegion(),element=document.createElement("div");element.tabIndex=0,element.style.position="fixed",element.style.top=0,element.style.left=0;const initialNode=element.cloneNode();currentLockRegion.parentNode.insertBefore(initialNode,currentLockRegion),initialFocusElementStack.push(initialNode);const finalNode=element.cloneNode();currentLockRegion.parentNode.insertBefore(finalNode,currentLockRegion.nextSibling),finalFocusElementStack.push(finalNode)})(newLockRegion),isLocked||document.addEventListener("focus",lockHandler,!0),!focusFirstDescendant()){const currentLockRegion=getCurrentLockRegion(),originalRegionTabIndex=currentLockRegion.tabIndex;currentLockRegion.tabIndex=0,attemptFocus(currentLockRegion),currentLockRegion.tabIndex=originalRegionTabIndex}lastFocus=document.activeElement,isLocked=!0};const untrapFocus=()=>{(()=>{lockRegionStack.pop();const finalNode=finalFocusElementStack.pop();finalNode&&finalNode.remove();const initialNode=initialFocusElementStack.pop();initialNode&&initialNode.remove()})(),lockRegionStack.length||(document.removeEventListener("focus",lockHandler,!0),lastFocus=null,ignoreFocusChanges=!1,isLocked=!1)};_exports.untrapFocus=untrapFocus})); //# sourceMappingURL=focuslock.min.js.map \ No newline at end of file diff --git a/lib/amd/build/local/aria/focuslock.min.js.map b/lib/amd/build/local/aria/focuslock.min.js.map index 7e4cb437f88..b3397770519 100644 --- a/lib/amd/build/local/aria/focuslock.min.js.map +++ b/lib/amd/build/local/aria/focuslock.min.js.map @@ -1 +1 @@ -{"version":3,"file":"focuslock.min.js","sources":["../../../src/local/aria/focuslock.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see .\n\n/**\n * Tab locking system.\n *\n * This is based on code and examples provided in the ARIA specification.\n * https://www.w3.org/TR/wai-aria-practices/examples/dialog-modal/dialog.html\n *\n * @module core/tablock\n * @copyright 2019 Andrew Nicols \n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\nimport Selectors from './selectors';\n\nconst lockRegionStack = [];\nconst initialFocusElementStack = [];\nconst finalFocusElementStack = [];\n\nlet lastFocus = null;\nlet ignoreFocusChanges = false;\nlet isLocked = false;\n\n/**\n * The lock handler.\n *\n * This is the item that does a majority of the work.\n * The overall logic from this comes from the examles in the WCAG guidelines.\n *\n * The general idea is that if the focus is not held within by an Element within the lock region, then we replace focus\n * on the first element in the lock region. If the first element is the element previously selected prior to the\n * user-initiated focus change, then instead jump to the last element in the lock region.\n *\n * This gives us a solution which supports focus locking of any kind, which loops in both directions, and which\n * prevents the lock from escaping the modal entirely.\n *\n * @method\n * @param {Event} event The event from the focus change\n */\nconst lockHandler = event => {\n if (ignoreFocusChanges) {\n // The focus change was made by an internal call to set focus.\n return;\n }\n\n const lockRegion = getCurrentLockRegion();\n\n if (!lockRegion.parentNode) {\n // The lock region does not exist.\n // Perhaps it was removed without being untrapped.\n untrapFocus();\n }\n\n if (lockRegion.contains(event.target)) {\n lastFocus = event.target;\n } else {\n focusFirstDescendant();\n if (lastFocus == document.activeElement) {\n focusLastDescendant();\n }\n lastFocus = document.activeElement;\n }\n};\n\n/**\n * Focus the first descendant of the current lock region.\n *\n * @method\n * @returns {Bool} Whether a node was focused\n */\nconst focusFirstDescendant = () => {\n const lockRegion = getCurrentLockRegion();\n\n // Grab all elements in the lock region and attempt to focus each element until one is focused.\n // We can capture most of this in the query selector, but some cases may still reject focus.\n // For example, a disabled text area cannot be focused, and it becomes difficult to provide a decent query selector\n // to capture this.\n // The use of Array.some just ensures that we stop as soon as we have a successful focus.\n const focusableElements = Array.from(lockRegion.querySelectorAll(Selectors.elements.focusable));\n\n // The lock region itself may be focusable. 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\ No newline at end of file +{"version":3,"file":"focuslock.min.js","sources":["../../../src/local/aria/focuslock.js"],"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see .\n\n/**\n * Tab locking system.\n *\n * This is based on code and examples provided in the ARIA specification.\n * https://www.w3.org/TR/wai-aria-practices/examples/dialog-modal/dialog.html\n *\n * @module core/tablock\n * @copyright 2019 Andrew Nicols \n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\nimport Selectors from './selectors';\n\nconst lockRegionStack = [];\nconst initialFocusElementStack = [];\nconst finalFocusElementStack = [];\n\nlet lastFocus = null;\nlet ignoreFocusChanges = false;\nlet isLocked = false;\n\n/**\n * The lock handler.\n *\n * This is the item that does a majority of the work.\n * The overall logic from this comes from the examles in the WCAG guidelines.\n *\n * The general idea is that if the focus is not held within by an Element within the lock region, then we replace focus\n * on the first element in the lock region. If the first element is the element previously selected prior to the\n * user-initiated focus change, then instead jump to the last element in the lock region.\n *\n * This gives us a solution which supports focus locking of any kind, which loops in both directions, and which\n * prevents the lock from escaping the modal entirely.\n *\n * @method\n * @param {Event} event The event from the focus change\n */\nconst lockHandler = event => {\n if (ignoreFocusChanges) {\n // The focus change was made by an internal call to set focus.\n return;\n }\n\n // Find the current lock region.\n let lockRegion = getCurrentLockRegion();\n while (lockRegion) {\n if (document.contains(lockRegion)) {\n break;\n }\n\n // The lock region does not exist.\n // Perhaps it was removed without being untrapped.\n untrapFocus();\n lockRegion = getCurrentLockRegion();\n }\n if (!lockRegion) {\n return;\n }\n\n if (lockRegion.contains(event.target)) {\n lastFocus = event.target;\n } else {\n focusFirstDescendant();\n if (lastFocus == document.activeElement) {\n focusLastDescendant();\n }\n lastFocus = document.activeElement;\n }\n};\n\n/**\n * Focus the first descendant of the current lock region.\n *\n * @method\n * @returns {Bool} Whether a node was focused\n */\nconst focusFirstDescendant = () => {\n const lockRegion = getCurrentLockRegion();\n\n // Grab all elements in the lock region and attempt to focus each element until one is focused.\n // We can capture most of this in the query selector, but some cases may still reject focus.\n // For example, a disabled text area cannot be focused, and it becomes difficult to provide a decent query selector\n // to capture this.\n // The use of Array.some just ensures that we stop as soon as we have a successful focus.\n const focusableElements = Array.from(lockRegion.querySelectorAll(Selectors.elements.focusable));\n\n // The lock region itself may be focusable. This is particularly true on Moodle's older dialogues.\n // We must include it in the calculation of descendants to ensure that looping works correctly.\n focusableElements.unshift(lockRegion);\n return focusableElements.some(focusableElement => attemptFocus(focusableElement));\n};\n\n/**\n * Focus the last descendant of the current lock region.\n *\n * @method\n * @returns {Bool} Whether a node was focused\n */\nconst focusLastDescendant = () => {\n const lockRegion = getCurrentLockRegion();\n\n // Grab all elements in the lock region, reverse them, and attempt to focus each element until one is focused.\n // We can capture most of this in the query selector, but some cases may still reject focus.\n // For example, a disabled text area cannot be focused, and it becomes difficult to provide a decent query selector\n // to capture this.\n // The use of Array.some just ensures that we stop as soon as we have a successful focus.\n const focusableElements = Array.from(lockRegion.querySelectorAll(Selectors.elements.focusable)).reverse();\n\n // The lock region itself may be focusable. This is particularly true on Moodle's older dialogues.\n // We must include it in the calculation of descendants to ensure that looping works correctly.\n focusableElements.push(lockRegion);\n return focusableElements.some(focusableElement => attemptFocus(focusableElement));\n};\n\n/**\n * Check whether the supplied focusTarget is actually focusable.\n * There are cases where a normally focusable element can reject focus.\n *\n * Note: This example is a wholesale copy of the WCAG example.\n *\n * @method\n * @param {HTMLElement} focusTarget\n * @returns {Bool}\n */\nconst isFocusable = focusTarget => {\n if (focusTarget.tabIndex > 0 || (focusTarget.tabIndex === 0 && focusTarget.getAttribute('tabIndex') !== null)) {\n return true;\n }\n\n if (focusTarget.disabled) {\n return false;\n }\n\n switch (focusTarget.nodeName) {\n case 'A':\n return !!focusTarget.href && focusTarget.rel != 'ignore';\n case 'INPUT':\n return focusTarget.type != 'hidden' && focusTarget.type != 'file';\n case 'BUTTON':\n case 'SELECT':\n case 'TEXTAREA':\n return true;\n default:\n return false;\n }\n};\n\n/**\n * Attempt to focus the supplied focusTarget.\n *\n * Note: This example is a heavily inspired by the WCAG example.\n *\n * @method\n * @param {HTMLElement} focusTarget\n * @returns {Bool} Whether focus was successful o rnot.\n */\nconst attemptFocus = focusTarget => {\n if (!isFocusable(focusTarget)) {\n return false;\n }\n\n // The ignoreFocusChanges variable prevents the focus event handler from interfering and entering a fight with itself.\n ignoreFocusChanges = true;\n\n try {\n focusTarget.focus();\n } catch (e) {\n // Ignore failures. 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\ No newline at end of file diff --git a/lib/amd/src/local/aria/focuslock.js b/lib/amd/src/local/aria/focuslock.js index 9b28ae9ccfe..eebcf303514 100644 --- a/lib/amd/src/local/aria/focuslock.js +++ b/lib/amd/src/local/aria/focuslock.js @@ -55,12 +55,20 @@ const lockHandler = event => { return; } - const lockRegion = getCurrentLockRegion(); + // Find the current lock region. + let lockRegion = getCurrentLockRegion(); + while (lockRegion) { + if (document.contains(lockRegion)) { + break; + } - if (!lockRegion.parentNode) { // The lock region does not exist. // Perhaps it was removed without being untrapped. untrapFocus(); + lockRegion = getCurrentLockRegion(); + } + if (!lockRegion) { + return; } if (lockRegion.contains(event.target)) {