Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/**
* Dropdown event handlers
*/
import type { DropdownElements, DropdownState, DropdownStateManager } from './state.js';
/**
* Calculates the next index when navigating down through menu items.
*/
function getNextIndex(currentIndex: number, totalItems: number): number {
return currentIndex < totalItems - 1 ? currentIndex + 1 : 0;
}
/**
* Calculates the previous index when navigating up through menu items.
*/
function getPrevIndex(currentIndex: number, totalItems: number): number {
return currentIndex > 0 ? currentIndex - 1 : totalItems - 1;
}
/**
* Handles keyboard navigation on the trigger button.
*/
function handleTriggerKeydown(
e: KeyboardEvent,
dropdown: HTMLElement,
state: DropdownState,
stateManager: DropdownStateManager
): void {
const { focusMenuItem, toggleDropdown, updateAriaExpanded } = stateManager;
const totalItems = state.menuItems.length;
switch (e.key) {
case 'Enter':
case ' ':
e.preventDefault();
toggleDropdown(!dropdown.classList.contains('is-active'));
break;
case 'ArrowDown':
e.preventDefault();
if (!dropdown.classList.contains('is-active')) {
dropdown.classList.add('is-active');
updateAriaExpanded(true);
focusMenuItem(0);
} else {
const nextIndex = state.currentIndex < 0 ? 0 : getNextIndex(state.currentIndex, totalItems);
focusMenuItem(nextIndex);
}
break;
case 'ArrowUp':
e.preventDefault();
if (!dropdown.classList.contains('is-active')) {
dropdown.classList.add('is-active');
updateAriaExpanded(true);
focusMenuItem(totalItems - 1);
} else {
const startIndex = state.currentIndex < 0 ? totalItems - 1 : state.currentIndex;
focusMenuItem(getPrevIndex(startIndex, totalItems));
}
break;
}
}
/**
* Handles keyboard navigation on menu items.
*/
function handleMenuItemKeydown(
e: KeyboardEvent,
index: number,
item: HTMLElement,
state: DropdownState,
stateManager: DropdownStateManager
): void {
const { focusMenuItem, closeDropdown } = stateManager;
const totalItems = state.menuItems.length;
switch (e.key) {
case 'ArrowDown':
e.preventDefault();
focusMenuItem(getNextIndex(index, totalItems));
break;
case 'ArrowUp':
e.preventDefault();
focusMenuItem(getPrevIndex(index, totalItems));
break;
case 'Escape':
e.preventDefault();
closeDropdown();
break;
case 'Enter':
case ' ':
e.preventDefault();
item.click();
break;
case 'Home':
e.preventDefault();
focusMenuItem(0);
break;
case 'End':
e.preventDefault();
focusMenuItem(totalItems - 1);
break;
}
}
/**
* Wires up all event handlers for the dropdown.
*/
export function wireDropdownEventHandlers(
documentObj: Document,
elements: DropdownElements,
state: DropdownState,
stateManager: DropdownStateManager,
abortController: AbortController
): void {
const { trigger, dropdown } = elements;
const { closeDropdown, toggleDropdown } = stateManager;
const signal = abortController.signal;
// Trigger click
trigger.addEventListener(
'click',
(e) => {
e.preventDefault();
toggleDropdown();
},
{ signal }
);
// Outside click
documentObj.addEventListener(
'click',
(e: MouseEvent) => {
if (!dropdown.contains(e.target as Node)) {
closeDropdown({ restoreFocus: false });
}
},
{ signal }
);
// Escape key (document-level)
documentObj.addEventListener(
'keydown',
(e: KeyboardEvent) => {
if (e.key === 'Escape' && dropdown.classList.contains('is-active')) {
closeDropdown({ restoreFocus: true });
}
},
{ signal }
);
// Trigger keyboard navigation
trigger.addEventListener(
'keydown',
(e: KeyboardEvent) => handleTriggerKeydown(e, dropdown, state, stateManager),
{ signal }
);
// Menu item keyboard navigation
for (const [index, item] of state.menuItems.entries()) {
item.addEventListener(
'keydown',
(e: KeyboardEvent) => handleMenuItemKeydown(e, index, item, state, stateManager),
{ signal }
);
}
}
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