249 lines
13 KiB
JavaScript
249 lines
13 KiB
JavaScript
import $ from 'jquery';
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import {generateAriaId} from './base.js';
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const ariaPatchKey = '_giteaAriaPatchDropdown';
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const fomanticDropdownFn = $.fn.dropdown;
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// use our own `$().dropdown` function to patch Fomantic's dropdown module
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export function initAriaDropdownPatch() {
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if ($.fn.dropdown === ariaDropdownFn) throw new Error('initAriaDropdownPatch could only be called once');
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$.fn.dropdown = ariaDropdownFn;
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ariaDropdownFn.settings = fomanticDropdownFn.settings;
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}
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// the patched `$.fn.dropdown` function, it passes the arguments to Fomantic's `$.fn.dropdown` function, and:
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// * it does the one-time attaching on the first call
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// * it delegates the `onLabelCreate` to the patched `onLabelCreate` to add necessary aria attributes
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function ariaDropdownFn(...args) {
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const ret = fomanticDropdownFn.apply(this, args);
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// if the `$().dropdown()` call is without arguments, or it has non-string (object) argument,
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// it means that this call will reset the dropdown internal settings, then we need to re-delegate the callbacks.
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const needDelegate = (!args.length || typeof args[0] !== 'string');
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for (const el of this) {
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const $dropdown = $(el);
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if (!el[ariaPatchKey]) {
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attachInit($dropdown);
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}
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if (needDelegate) {
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delegateOne($dropdown);
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}
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}
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return ret;
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}
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// make the item has role=option/menuitem, add an id if there wasn't one yet, make items as non-focusable
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// the elements inside the dropdown menu item should not be focusable, the focus should always be on the dropdown primary element.
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function updateMenuItem(dropdown, item) {
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if (!item.id) item.id = generateAriaId();
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item.setAttribute('role', dropdown[ariaPatchKey].listItemRole);
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item.setAttribute('tabindex', '-1');
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for (const el of item.querySelectorAll('a, input, button')) el.setAttribute('tabindex', '-1');
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}
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// make the label item and its "delete icon" has correct aria attributes
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function updateSelectionLabel($label) {
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// the "label" is like this: "<a|div class="ui label" data-value="1">the-label-name <i|svg class="delete icon"/></a>"
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if (!$label.attr('id')) $label.attr('id', generateAriaId());
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$label.attr('tabindex', '-1');
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$label.find('.delete.icon').attr({
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'aria-hidden': 'false',
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'aria-label': window.config.i18n.remove_label_str.replace('%s', $label.attr('data-value')),
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'role': 'button',
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});
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}
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// delegate the dropdown's template functions and callback functions to add aria attributes.
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function delegateOne($dropdown) {
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const dropdownCall = fomanticDropdownFn.bind($dropdown);
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// If there is a "search input" in the "menu", Fomantic will only "focus the input" but not "toggle the menu" when the "dropdown icon" is clicked.
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// Actually, Fomantic UI doesn't support such layout/usage. It needs to patch the "focusSearch" / "blurSearch" functions to make sure it toggles the menu.
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const oldFocusSearch = dropdownCall('internal', 'focusSearch');
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const oldBlurSearch = dropdownCall('internal', 'blurSearch');
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// * If the "dropdown icon" is clicked, Fomantic calls "focusSearch", so show the menu
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dropdownCall('internal', 'focusSearch', function () { dropdownCall('show'); oldFocusSearch.call(this) });
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// * If the "dropdown icon" is clicked again when the menu is visible, Fomantic calls "blurSearch", so hide the menu
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dropdownCall('internal', 'blurSearch', function () { oldBlurSearch.call(this); dropdownCall('hide') });
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// the "template" functions are used for dynamic creation (eg: AJAX)
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const dropdownTemplates = {...dropdownCall('setting', 'templates'), t: performance.now()};
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const dropdownTemplatesMenuOld = dropdownTemplates.menu;
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dropdownTemplates.menu = function(response, fields, preserveHTML, className) {
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// when the dropdown menu items are loaded from AJAX requests, the items are created dynamically
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const menuItems = dropdownTemplatesMenuOld(response, fields, preserveHTML, className);
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const div = document.createElement('div');
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div.innerHTML = menuItems;
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const $wrapper = $(div);
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const $items = $wrapper.find('> .item');
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$items.each((_, item) => updateMenuItem($dropdown[0], item));
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$dropdown[0][ariaPatchKey].deferredRefreshAriaActiveItem();
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return $wrapper.html();
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};
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dropdownCall('setting', 'templates', dropdownTemplates);
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// the `onLabelCreate` is used to add necessary aria attributes for dynamically created selection labels
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const dropdownOnLabelCreateOld = dropdownCall('setting', 'onLabelCreate');
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dropdownCall('setting', 'onLabelCreate', function(value, text) {
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const $label = dropdownOnLabelCreateOld.call(this, value, text);
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updateSelectionLabel($label);
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return $label;
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});
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}
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// for static dropdown elements (generated by server-side template), prepare them with necessary aria attributes
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function attachStaticElements($dropdown, $focusable, $menu) {
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const dropdown = $dropdown[0];
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// prepare static dropdown menu list popup
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if (!$menu.attr('id')) $menu.attr('id', generateAriaId());
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$menu.find('> .item').each((_, item) => updateMenuItem(dropdown, item));
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// this role could only be changed after its content is ready, otherwise some browsers+readers (like Chrome+AppleVoice) crash
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$menu.attr('role', dropdown[ariaPatchKey].listPopupRole);
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// prepare selection label items
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$dropdown.find('.ui.label').each((_, label) => updateSelectionLabel($(label)));
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// make the primary element (focusable) aria-friendly
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$focusable.attr({
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'role': $focusable.attr('role') ?? dropdown[ariaPatchKey].focusableRole,
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'aria-haspopup': dropdown[ariaPatchKey].listPopupRole,
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'aria-controls': $menu.attr('id'),
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'aria-expanded': 'false',
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});
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// use tooltip's content as aria-label if there is no aria-label
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const tooltipContent = $dropdown.attr('data-tooltip-content');
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if (tooltipContent && !$dropdown.attr('aria-label')) {
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$dropdown.attr('aria-label', tooltipContent);
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}
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}
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function attachInit($dropdown) {
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const dropdown = $dropdown[0];
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dropdown[ariaPatchKey] = {};
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if ($dropdown.hasClass('custom')) return;
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// Dropdown has 2 different focusing behaviors
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// * with search input: the input is focused, and it works with aria-activedescendant pointing another sibling element.
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// * without search input (but the readonly text), the dropdown itself is focused. then the aria-activedescendant points to the element inside dropdown
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// Some desktop screen readers may change the focus, but dropdown requires that the focus must be on its primary element, then they don't work well.
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// Expected user interactions for dropdown with aria support:
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// * user can use Tab to focus in the dropdown, then the dropdown menu (list) will be shown
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// * user presses Tab on the focused dropdown to move focus to next sibling focusable element (but not the menu item)
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// * user can use arrow key Up/Down to navigate between menu items
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// * when user presses Enter:
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// - if the menu item is clickable (eg: <a>), then trigger the click event
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// - otherwise, the dropdown control (low-level code) handles the Enter event, hides the dropdown menu
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// TODO: multiple selection is only partially supported. Check and test them one by one in the future.
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const $textSearch = $dropdown.find('input.search').eq(0);
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const $focusable = $textSearch.length ? $textSearch : $dropdown; // the primary element for focus, see comment above
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if (!$focusable.length) return;
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// as a combobox, the input should not have autocomplete by default
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if ($textSearch.length && !$textSearch.attr('autocomplete')) {
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$textSearch.attr('autocomplete', 'off');
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}
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let $menu = $dropdown.find('> .menu');
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if (!$menu.length) {
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// some "multiple selection" dropdowns don't have a static menu element in HTML, we need to pre-create it to make it have correct aria attributes
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$menu = $('<div class="menu"></div>').appendTo($dropdown);
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}
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// There are 2 possible solutions about the role: combobox or menu.
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// The idea is that if there is an input, then it's a combobox, otherwise it's a menu.
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// Since #19861 we have prepared the "combobox" solution, but didn't get enough time to put it into practice and test before.
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const isComboBox = $dropdown.find('input').length > 0;
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dropdown[ariaPatchKey].focusableRole = isComboBox ? 'combobox' : 'menu';
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dropdown[ariaPatchKey].listPopupRole = isComboBox ? 'listbox' : '';
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dropdown[ariaPatchKey].listItemRole = isComboBox ? 'option' : 'menuitem';
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attachDomEvents($dropdown, $focusable, $menu);
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attachStaticElements($dropdown, $focusable, $menu);
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}
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function attachDomEvents($dropdown, $focusable, $menu) {
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const dropdown = $dropdown[0];
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// when showing, it has class: ".animating.in"
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// when hiding, it has class: ".visible.animating.out"
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const isMenuVisible = () => ($menu.hasClass('visible') && !$menu.hasClass('out')) || $menu.hasClass('in');
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// update aria attributes according to current active/selected item
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const refreshAriaActiveItem = () => {
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const menuVisible = isMenuVisible();
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$focusable.attr('aria-expanded', menuVisible ? 'true' : 'false');
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// if there is an active item, use it (the user is navigating between items)
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// otherwise use the "selected" for combobox (for the last selected item)
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const $active = $menu.find('> .item.active, > .item.selected');
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// if the popup is visible and has an active/selected item, use its id as aria-activedescendant
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if (menuVisible) {
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$focusable.attr('aria-activedescendant', $active.attr('id'));
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} else if (dropdown[ariaPatchKey].listPopupRole === 'menu') {
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// for menu, when the popup is hidden, no need to keep the aria-activedescendant, and clear the active/selected item
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$focusable.removeAttr('aria-activedescendant');
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$active.removeClass('active').removeClass('selected');
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}
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};
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$dropdown.on('keydown', (e) => {
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// here it must use keydown event before dropdown's keyup handler, otherwise there is no Enter event in our keyup handler
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if (e.key === 'Enter') {
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const dropdownCall = fomanticDropdownFn.bind($dropdown);
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let $item = dropdownCall('get item', dropdownCall('get value'));
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if (!$item) $item = $menu.find('> .item.selected'); // when dropdown filters items by input, there is no "value", so query the "selected" item
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// if the selected item is clickable, then trigger the click event.
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// we can not click any item without check, because Fomantic code might also handle the Enter event. that would result in double click.
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if ($item && ($item.is('a') || $item.hasClass('js-aria-clickable'))) $item[0].click();
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}
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});
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// use setTimeout to run the refreshAria in next tick (to make sure the Fomantic UI code has finished its work)
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// do not return any value, jQuery has return-value related behaviors.
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// when the popup is hiding, it's better to have a small "delay", because there is a Fomantic UI animation
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// without the delay for hiding, the UI will be somewhat laggy and sometimes may get stuck in the animation.
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const deferredRefreshAriaActiveItem = (delay = 0) => { setTimeout(refreshAriaActiveItem, delay) };
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dropdown[ariaPatchKey].deferredRefreshAriaActiveItem = deferredRefreshAriaActiveItem;
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$dropdown.on('keyup', (e) => { if (e.key.startsWith('Arrow')) deferredRefreshAriaActiveItem(); });
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// if the dropdown has been opened by focus, do not trigger the next click event again.
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// otherwise the dropdown will be closed immediately, especially on Android with TalkBack
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// * desktop event sequence: mousedown -> focus -> mouseup -> click
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// * mobile event sequence: focus -> mousedown -> mouseup -> click
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// Fomantic may stop propagation of blur event, use capture to make sure we can still get the event
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let ignoreClickPreEvents = 0, ignoreClickPreVisible = 0;
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dropdown.addEventListener('mousedown', () => {
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ignoreClickPreVisible += isMenuVisible() ? 1 : 0;
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ignoreClickPreEvents++;
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}, true);
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dropdown.addEventListener('focus', () => {
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ignoreClickPreVisible += isMenuVisible() ? 1 : 0;
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ignoreClickPreEvents++;
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deferredRefreshAriaActiveItem();
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}, true);
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dropdown.addEventListener('blur', () => {
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ignoreClickPreVisible = ignoreClickPreEvents = 0;
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deferredRefreshAriaActiveItem(100);
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}, true);
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dropdown.addEventListener('mouseup', () => {
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setTimeout(() => {
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ignoreClickPreVisible = ignoreClickPreEvents = 0;
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deferredRefreshAriaActiveItem(100);
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}, 0);
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}, true);
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dropdown.addEventListener('click', (e) => {
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if (isMenuVisible() &&
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ignoreClickPreVisible !== 2 && // dropdown is switch from invisible to visible
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ignoreClickPreEvents === 2 // the click event is related to mousedown+focus
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) {
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e.stopPropagation(); // if the dropdown menu has been opened by focus, do not trigger the next click event again
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}
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ignoreClickPreEvents = ignoreClickPreVisible = 0;
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}, true);
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}
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