| blob | 4f4e21fdd9d87a44c9f3dfba4fd238705343cfbd |
1 {"version":3,"file":"aria.min.js","sources":["../src/aria.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 <http://www.gnu.org/licenses/>.\n\n/**\n * Enhancements to Bootstrap components for accessibility.\n *\n * @module theme_boost/aria\n * @copyright 2018 Damyon Wiese <damyon@moodle.com>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\n\nimport $ from 'jquery';\nimport Pending from 'core/pending';\nimport * as FocusLockManager from 'core/local/aria/focuslock';\n\n/**\n * Drop downs from bootstrap don't support keyboard accessibility by default.\n */\nconst dropdownFix = () => {\n let focusEnd = false;\n const setFocusEnd = (end = true) => {\n focusEnd = end;\n };\n const getFocusEnd = () => {\n const result = focusEnd;\n focusEnd = false;\n return result;\n };\n\n // Special handling for navigation keys when menu is open.\n const shiftFocus = (element, focusCheck = null) => {\n const pendingPromise = new Pending('core/aria:delayed-focus');\n setTimeout(() => {\n if (!focusCheck || focusCheck()) {\n element.focus();\n }\n\n pendingPromise.resolve();\n }, 50);\n };\n\n // Event handling for the dropdown menu button.\n const handleMenuButton = e => {\n const trigger = e.key;\n let fixFocus = false;\n\n // Space key or Enter key opens the menu.\n if (trigger === ' ' || trigger === 'Enter') {\n fixFocus = true;\n // Cancel random scroll.\n e.preventDefault();\n // Open the menu instead.\n e.target.click();\n }\n\n // Up and Down keys also open the menu.\n if (trigger === 'ArrowUp' || trigger === 'ArrowDown') {\n fixFocus = true;\n }\n\n if (!fixFocus) {\n // No need to fix the focus. Return early.\n return;\n }\n\n // Fix the focus on the menu items when the menu is opened.\n const menu = e.target.parentElement.querySelector('[role=\"menu\"]');\n let menuItems = false;\n let foundMenuItem = false;\n\n if (menu) {\n menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n }\n if (menuItems && menuItems.length > 0) {\n // Up key opens the menu at the end.\n if (trigger === 'ArrowUp') {\n setFocusEnd();\n } else {\n setFocusEnd(false);\n }\n\n if (getFocusEnd()) {\n foundMenuItem = menuItems[menuItems.length - 1];\n } else {\n // The first menu entry, pretty reasonable.\n foundMenuItem = menuItems[0];\n }\n }\n\n if (foundMenuItem) {\n shiftFocus(foundMenuItem);\n }\n };\n\n // Search for menu items by finding the first item that has\n // text starting with the typed character (case insensitive).\n document.addEventListener('keypress', e => {\n if (e.target.matches('[role=\"menu\"] [role=\"menuitem\"]')) {\n const menu = e.target.closest('[role=\"menu\"]');\n if (!menu) {\n return;\n }\n const menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n if (!menuItems) {\n return;\n }\n\n const trigger = e.key.toLowerCase();\n\n for (let i = 0; i < menuItems.length; i++) {\n const item = menuItems[i];\n const itemText = item.text.trim().toLowerCase();\n if (itemText.indexOf(trigger) == 0) {\n shiftFocus(item);\n break;\n }\n }\n }\n });\n\n // Keyboard navigation for arrow keys, home and end keys.\n document.addEventListener('keydown', e => {\n\n // We only want to set focus when users access the dropdown via keyboard as per\n // guidelines defined in w3 aria practices 1.1 menu-button.\n if (e.target.matches('[data-toggle=\"dropdown\"]')) {\n handleMenuButton(e);\n }\n\n if (e.target.matches('[role=\"menu\"] [role=\"menuitem\"]')) {\n const trigger = e.key;\n let next = false;\n const menu = e.target.closest('[role=\"menu\"]');\n\n if (!menu) {\n return;\n }\n const menuItems = menu.querySelectorAll('[role=\"menuitem\"]');\n if (!menuItems) {\n return;\n }\n // Down key.\n if (trigger == 'ArrowDown') {\n for (let i = 0; i < menuItems.length - 1; i++) {\n if (menuItems[i] == e.target) {\n next = menuItems[i + 1];\n break;\n }\n }\n if (!next) {\n // Wrap to first item.\n next = menuItems[0];\n }\n } else if (trigger == 'ArrowUp') {\n // Up key.\n for (let i = 1; i < menuItems.length; i++) {\n if (menuItems[i] == e.target) {\n next = menuItems[i - 1];\n break;\n }\n }\n if (!next) {\n // Wrap to last item.\n next = menuItems[menuItems.length - 1];\n }\n } else if (trigger == 'Home') {\n // Home key.\n next = menuItems[0];\n\n } else if (trigger == 'End') {\n // End key.\n next = menuItems[menuItems.length - 1];\n }\n\n // Variable next is set if we do want to act on the keypress.\n if (next) {\n e.preventDefault();\n shiftFocus(next);\n }\n return;\n }\n });\n\n // Trap focus if the dropdown is a dialog.\n $(document).on('shown.bs.dropdown', e => {\n const dialog = e.target.querySelector('.dropdown-menu[role=\"dialog\"]');\n if (dialog) {\n // Use setTimeout to make sure the dialog is positioned correctly to prevent random scrolling.\n setTimeout(() => {\n FocusLockManager.trapFocus(dialog);\n });\n }\n });\n\n // Untrap focus when the dialog dropdown is closed.\n $(document).on('hidden.bs.dropdown', e => {\n const dialog = e.target.querySelector('.dropdown-menu[role=\"dialog\"]');\n if (dialog) {\n FocusLockManager.untrapFocus();\n }\n\n // We need to focus on the menu trigger.\n const trigger = e.target.querySelector('[data-toggle=\"dropdown\"]');\n // If it's a click event, then no element is focused because the clicked element is inside a closed dropdown.\n const focused = e.clickEvent?.target || (document.activeElement !== document.body ? document.activeElement : null);\n if (trigger && focused && e.target.contains(focused)) {\n shiftFocus(trigger, () => {\n if (document.activeElement === document.body) {\n // If the focus is currently on the body, then we can safely assume that the focus needs to be updated.\n return true;\n }\n\n // If the focus is on a child of the clicked element still, then update the focus.\n return e.target.contains(document.activeElement);\n });\n }\n });\n};\n\n/**\n * A lot of Bootstrap's out of the box features don't work if dropdown items are not focusable.\n */\nconst comboboxFix = () => {\n $(document).on('show.bs.dropdown', e => {\n if (e.relatedTarget.matches('[role=\"combobox\"]')) {\n const combobox = e.relatedTarget;\n const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role=\"listbox\"]`);\n\n if (listbox) {\n const selectedOption = listbox.querySelector('[role=\"option\"][aria-selected=\"true\"]');\n\n // To make sure ArrowDown doesn't move the active option afterwards.\n setTimeout(() => {\n if (selectedOption) {\n selectedOption.classList.add('active');\n combobox.setAttribute('aria-activedescendant', selectedOption.id);\n } else {\n const firstOption = listbox.querySelector('[role=\"option\"]');\n firstOption.setAttribute('aria-selected', 'true');\n firstOption.classList.add('active');\n combobox.setAttribute('aria-activedescendant', firstOption.id);\n }\n }, 0);\n }\n }\n });\n\n $(document).on('hidden.bs.dropdown', e => {\n if (e.relatedTarget.matches('[role=\"combobox\"]')) {\n const combobox = e.relatedTarget;\n const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role=\"listbox\"]`);\n\n combobox.removeAttribute('aria-activedescendant');\n\n if (listbox) {\n setTimeout(() => {\n // Undo all previously highlighted options.\n listbox.querySelectorAll('.active[role=\"option\"]').forEach(option => {\n option.classList.remove('active');\n });\n }, 0);\n }\n }\n });\n\n // Handling keyboard events for both navigating through and selecting options.\n document.addEventListener('keydown', e => {\n if (e.target.matches('[role=\"combobox\"][aria-controls]:not([aria-haspopup=dialog])')) {\n const combobox = e.target;\n const trigger = e.key;\n let next = null;\n const listbox = document.querySelector(`#${combobox.getAttribute('aria-controls')}[role=\"listbox\"]`);\n const options = listbox.querySelectorAll('[role=\"option\"]');\n const activeOption = listbox.querySelector('.active[role=\"option\"]');\n const editable = combobox.hasAttribute('aria-autocomplete');\n\n // Under the special case that the dropdown menu is being shown as a result of the key press (like when the user\n // presses ArrowDown or Enter or ... to open the dropdown menu), activeOption is not set yet.\n // It's because of a race condition with show.bs.dropdown event handler.\n if (options && (activeOption || editable)) {\n if (trigger == 'ArrowDown') {\n for (let i = 0; i < options.length - 1; i++) {\n if (options[i] == activeOption) {\n next = options[i + 1];\n break;\n }\n }\n if (editable && !next) {\n next = options[0];\n }\n } if (trigger == 'ArrowUp') {\n for (let i = 1; i < options.length; i++) {\n if (options[i] == activeOption) {\n next = options[i - 1];\n break;\n }\n }\n if (editable && !next) {\n next = options[options.length - 1];\n }\n } else if (trigger == 'Home' && !editable) {\n next = options[0];\n } else if (trigger == 'End' && !editable) {\n next = options[options.length - 1];\n } else if ((trigger == ' ' && !editable) || trigger == 'Enter') {\n e.preventDefault();\n selectOption(combobox, activeOption);\n } else if (!editable) {\n // Search for options by finding the first option that has\n // text starting with the typed character (case insensitive).\n for (let i = 0; i < options.length; i++) {\n const option = options[i];\n const optionText = option.textContent.trim().toLowerCase();\n const keyPressed = e.key.toLowerCase();\n if (optionText.indexOf(keyPressed) == 0) {\n next = option;\n break;\n }\n }\n }\n\n // Variable next is set if we do want to act on the keypress.\n if (next) {\n e.preventDefault();\n if (activeOption) {\n activeOption.classList.remove('active');\n }\n next.classList.add('active');\n combobox.setAttribute('aria-activedescendant', next.id);\n next.scrollIntoView({block: 'nearest'});\n }\n }\n }\n });\n\n document.addEventListener('click', e => {\n const option = e.target.closest('[role=\"listbox\"] [role=\"option\"]');\n if (option) {\n const listbox = option.closest('[role=\"listbox\"]');\n const combobox = document.querySelector(`[role=\"combobox\"][aria-controls=\"${listbox.id}\"]`);\n if (combobox) {\n selectOption(combobox, option);\n }\n }\n });\n\n // In case some code somewhere else changes the value of the combobox.\n document.addEventListener('change', e => {\n if (e.target.matches('input[type=\"hidden\"][id]')) {\n const combobox = document.querySelector(`[role=\"combobox\"][data-input-element=\"${e.target.id}\"]`);\n const option = e.target.parentElement.querySelector(`[role=\"option\"][data-value=\"${e.target.value}\"]`);\n\n if (combobox && option) {\n selectOption(combobox, option);\n }\n }\n });\n\n const selectOption = (combobox, option) => {\n const listbox = option.closest('[role=\"listbox\"]');\n const oldSelectedOption = listbox.querySelector('[role=\"option\"][aria-selected=\"true\"]');\n\n if (oldSelectedOption != option) {\n if (oldSelectedOption) {\n oldSelectedOption.removeAttribute('aria-selected');\n }\n option.setAttribute('aria-selected', 'true');\n }\n\n if (combobox.hasAttribute('value')) {\n combobox.value = option.dataset.shortText || option.textContent.replace(/[\\n\\r]+|[\\s]{2,}/g, ' ').trim();\n } else {\n const selectedOptionContainer = combobox.querySelector('[data-selected-option]');\n if (selectedOptionContainer) {\n selectedOptionContainer.textContent = option.dataset.shortText || option.textContent;\n } else {\n combobox.textContent = option.dataset.shortText || option.textContent;\n }\n }\n\n if (combobox.dataset.inputElement) {\n const inputElement = document.getElementById(combobox.dataset.inputElement);\n if (inputElement && (inputElement.value != option.dataset.value)) {\n inputElement.value = option.dataset.value;\n inputElement.dispatchEvent(new Event('change', {bubbles: true}));\n }\n }\n };\n};\n\n/**\n * After page load, focus on any element with special autofocus attribute.\n */\nconst autoFocus = () => {\n window.addEventListener(\"load\", () => {\n const alerts = document.querySelectorAll('[data-aria-autofocus=\"true\"][role=\"alert\"]');\n Array.prototype.forEach.call(alerts, autofocusElement => {\n // According to the specification an role=\"alert\" region is only read out on change to the content\n // of that region.\n autofocusElement.innerHTML += ' ';\n autofocusElement.removeAttribute('data-aria-autofocus');\n });\n });\n};\n\n/**\n * Changes the focus to the correct element based on the key that is pressed.\n * @param {NodeList} elements A NodeList of focusable elements to navigate between.\n * @param {KeyboardEvent} e The keyboard event that triggers the roving focus.\n * @param {boolean} vertical Whether the navigation is vertical.\n * @param {boolean} updateTabIndex Whether to update the tabIndex of the elements.\n */\nconst rovingFocus = (elements, e, vertical, updateTabIndex) => {\n const rtl = window.right_to_left();\n const arrowNext = vertical ? 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tabs = Array.prototype.filter.call(\n tabList.querySelectorAll('[role=\"tab\"]'),\n tab => !!tab.offsetHeight\n ); // We only work with the visible tabs.\n const vertical = tabList.getAttribute('aria-orientation') == 'vertical';\n\n rovingFocus(tabs, e, vertical, false);\n }\n }\n });\n\n document.addEventListener('click', e => {\n if (e.target.matches('[role=\"tablist\"] [data-toggle=\"tab\"], [role=\"tablist\"] [data-toggle=\"pill\"]')) {\n const tabs = e.target.closest('[role=\"tablist\"]').querySelectorAll('[data-toggle=\"tab\"], [data-toggle=\"pill\"]');\n e.preventDefault();\n $(e.target).tab('show');\n tabs.forEach(tab => {\n tab.tabIndex = -1;\n });\n e.target.tabIndex = 0;\n }\n });\n};\n\n/**\n * Fix keyboard interaction with Bootstrap Collapse elements.\n *\n * @see {@link https://www.w3.org/TR/wai-aria-practices-1.1/#disclosure|WAI-ARIA Authoring Practices 1.1 - Disclosure (Show/Hide)}\n */\nconst collapseFix = () => {\n document.addEventListener('keydown', e => {\n if 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