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expandDropdown,
collapseDropdown,
setFocusable,
setActiveDropdown,
setupAnimationStart,
} from "./dropdownUtils";
const ANIMATION_DURATION = 333;
export const initNavigationListeners = () => {
const navigation = document.querySelector(
".p-navigation--sliding"
)! as HTMLElement;
const menuButton = document.querySelector(
".p-navigation__banner .p-navigation__toggle--open"
)! as HTMLElement;
// all-canonical-link has it's own toggle listener coming from global-nav
const toggles = [
...document.querySelectorAll(
".p-navigation__nav .p-navigation__link[aria-controls]:not(.js-back-button)"
),
]
.map((element) => element as HTMLElement)
.filter((htmlElement) => htmlElement.id !== "all-canonical-link");
const topNavItemsLists = document.querySelectorAll(
".p-navigation__nav > .p-navigation__items"
);
const dropdownLinksLists = document.querySelectorAll(
".p-navigation__dropdown"
);
const allCanonicalLink = document.getElementById("all-canonical-link")!;
// global-nav related elements to fix certain problems for mobile view
const desktopGlobalNav = document.getElementById("all-canonical-desktop")!;
const overlayGlobalNav = document.getElementById("all-canonical-overlay")!;
const togglesMobileGlobalNav = [
...document.querySelectorAll(
"#all-canonical-mobile button.global-nav__header-link-anchor"
),
].map((element) => element as HTMLElement);
const collapseAllDropdowns = (excludedToggle?: HTMLElement) => {
toggles.forEach((toggle) => {
const ariaControls = toggle.getAttribute("aria-controls");
if (ariaControls) {
const target = document.getElementById(ariaControls);
if (target && !(target === excludedToggle)) {
collapseDropdown(toggle, target);
}
}
});
// handle the dropdowns from global-nav mobile too
togglesMobileGlobalNav.forEach((toggle) => {
const parent = toggle.parentElement;
const dropdownContents = parent?.querySelector(
":scope > .p-navigation__dropdown"
);
if (dropdownContents) {
collapseDropdown(toggle, dropdownContents as HTMLElement);
}
});
};
const closeMenu = () => {
navigation.classList.add("menu-closing");
const closeMenuHandler = () => {
navigation.classList.remove("has-menu-open");
navigation.classList.remove("menu-closing");
};
// the time is aproximately the time of the sliding animation
setTimeout(closeMenuHandler, ANIMATION_DURATION);
};
const resetNavigation = () => {
collapseAllDropdowns();
closeMenu();
};
const unfocusAllLinks = () => {
// turn off focusability for all dropdown lists in the navigation
dropdownLinksLists.forEach((list) => {
const elements = list.querySelectorAll("ul > li > a, ul > li > button");
elements.forEach((element) => {
element.setAttribute("tabindex", "-1");
});
});
};
const goBackOneLevel = (e: Event, backButton: HTMLElement) => {
e.preventDefault();
const target = backButton.closest(".p-navigation__dropdown");
if (target && target.parentNode) {
unfocusAllLinks();
if (target.parentNode.parentNode) {
setFocusable(target.parentNode.parentNode as Element);
}
const links = target.parentNode.querySelector(".p-navigation__link");
if (links && links instanceof HTMLElement) {
links.focus();
}
target.setAttribute("aria-hidden", "true");
setActiveDropdown(backButton, false);
}
};
const handleMenuButtonClick = (e: Event) => {
e.preventDefault();
if (navigation.classList.contains("has-menu-open")) {
resetNavigation();
menuButton.innerHTML = "Menu";
// remove classes set for desktop global nav
desktopGlobalNav.classList.remove("show-content");
overlayGlobalNav.classList.remove("show-overlay");
// reshow scroll bar
document.body.style.overflow = "visible";
} else {
navigation.classList.add("has-menu-open");
unfocusAllLinks();
menuButton.innerHTML = "Close menu";
for (const topNavItemsList of topNavItemsLists) {
setFocusable(topNavItemsList);
}
// hide scroll bar
document.body.style.overflow = "hidden";
}
};
const handleClickOutsideNavigation = (e: Event) => {
const target = e.target;
if (target && target instanceof HTMLElement) {
// check if the click was outside the navigation
const topNavigationElement = target.closest(
".p-navigation, .p-navigation--sliding, .p-navigation--reduced"
);
if (!topNavigationElement || target === allCanonicalLink) {
// set js-animation-playing on all dropdowns
setupAnimationStart(toggles, ANIMATION_DURATION);
resetNavigation();
}
}
};
const handleToggle = (e: Event, toggle: HTMLElement) => {
e.preventDefault();
setupAnimationStart(toggles, ANIMATION_DURATION);
const ariaControls = toggle.getAttribute("aria-controls");
if (ariaControls) {
const target = document.getElementById(ariaControls);
if (target && target.parentNode) {
// check if the toggled dropdown is child of another dropdown
const isNested = !!(target.parentNode as HTMLElement).closest(
".p-navigation__dropdown"
);
if (!isNested) {
collapseAllDropdowns(target);
}
if (target.getAttribute("aria-hidden") === "true") {
unfocusAllLinks();
expandDropdown(toggle, target);
navigation.classList.add("has-menu-open");
} else {
collapseDropdown(toggle, target);
if (!isNested) {
closeMenu();
}
}
}
}
e.stopPropagation();
};
const handledropdownLinksLists = (e: Event, dropdown: HTMLElement) => {
if (
e instanceof KeyboardEvent &&
e.shiftKey &&
e.key === "Tab" &&
window.getComputedStyle(dropdown.children[0], null).display === "none"
) {
const backButton = dropdown.children[1].children[0] as HTMLElement;
goBackOneLevel(e, backButton);
const focusElement = dropdown.parentNode?.children[0] as HTMLElement;
focusElement?.focus({ preventScroll: true });
}
};
const handleGoBackOneLevel = (e: Event, backButton: HTMLElement) => {
goBackOneLevel(e, backButton);
};
// add listeners to control the navigation
menuButton.addEventListener("click", handleMenuButtonClick);
toggles.forEach((toggle) => {
const handler = (e: Event) => handleToggle(e, toggle);
toggle.addEventListener("click", handler);
});
dropdownLinksLists.forEach((dropdown) => {
const handler = (e: Event) =>
handledropdownLinksLists(e, dropdown as HTMLElement);
dropdown.children[1].addEventListener("keydown", handler);
});
document.querySelectorAll(".js-back-button").forEach((backButton) => {
const handler = (e: Event) =>
handleGoBackOneLevel(e, backButton as HTMLElement);
backButton.addEventListener("click", handler);
});
// when clicking outside navigation or in "All Canonical", close all dropdowns
document.addEventListener("click", handleClickOutsideNavigation);
allCanonicalLink.addEventListener("click", handleClickOutsideNavigation);
};
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