125 lines
4.2 KiB
JavaScript
125 lines
4.2 KiB
JavaScript
const
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HEADER_SELECTOR = 'header',
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SEARCH_BOX_SELECTOR = '.vector-search-box',
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SEARCH_VISIBLE_CLASS = 'vector-header-search-toggled';
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/**
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* Binds event handlers necessary for the searchBox to disappear when the user
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* clicks outside the searchBox.
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*
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* @param {HTMLElement} searchBox
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* @param {HTMLElement} header
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*/
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function bindSearchBoxHandler( searchBox, header ) {
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/**
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* @param {Event} ev
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* @ignore
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*/
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const clickHandler = ( ev ) => {
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if (
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ev.target instanceof HTMLElement &&
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// Check if the click target was a suggestion link. WVUI clears the
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// suggestion elements from the DOM when a suggestion is clicked so we
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// can't test if the suggestion is a child of the searchBox.
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//
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// Note: The .closest API is feature detected in `initSearchToggle`.
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!ev.target.closest( '.wvui-typeahead-suggestion' ) &&
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!searchBox.contains( ev.target )
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) {
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header.classList.remove( SEARCH_VISIBLE_CLASS );
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document.removeEventListener( 'click', clickHandler );
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}
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};
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document.addEventListener( 'click', clickHandler );
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}
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/**
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* Binds event handlers necessary for the searchBox to show when the toggle is
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* clicked.
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*
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* @param {HTMLElement} searchBox
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* @param {HTMLElement} header
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* @param {Element} searchToggle
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*/
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function bindToggleClickHandler( searchBox, header, searchToggle ) {
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/**
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* @param {Event} ev
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* @ignore
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*/
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const handler = ( ev ) => {
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// The toggle is an anchor element. Prevent the browser from navigating away
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// from the page when clicked.
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ev.preventDefault();
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header.classList.add( SEARCH_VISIBLE_CLASS );
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// Defer binding the search box handler until after the event bubbles to the
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// top of the document so that the handler isn't called when the user clicks
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// the search toggle. Event bubbled callbacks execute within the same task
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// in the event loop.
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//
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// Also, defer focusing the input to another task in the event loop. At the time
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// of this writing, Safari 14.0.3 has trouble changing the visibility of the
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// element and focusing the input within the same task.
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setTimeout( () => {
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bindSearchBoxHandler( searchBox, header );
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const searchInput = /** @type {HTMLInputElement|null} */ ( searchBox.querySelector( 'input[type="search"]' ) );
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if ( searchInput ) {
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const beforeScrollX = window.scrollX;
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const beforeScrollY = window.scrollY;
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searchInput.focus();
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// For some reason, Safari 14,15 tends to undesirably change the scroll
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// position of `input` elements inside fixed position elements.
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// While an Internet search suggests similar problems with mobile Safari
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// it didn't yield any results for desktop Safari.
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// This line resets any unexpected scrolling that occurred while the
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// input received focus.
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// If you are in the future with a modern version of Safari, where 14 and 15
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// receive a low amount of page views, please reference T297636 and test
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// to see whether this line of code can be removed.
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// Additionally, these lines might become unnecessary when/if Safari
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// supports the `preventScroll` focus option [1] in the future:
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// https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus#parameters
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if ( beforeScrollX !== undefined && beforeScrollY !== undefined ) {
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window.scroll( beforeScrollX, beforeScrollY );
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}
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}
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} );
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};
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searchToggle.addEventListener( 'click', handler );
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}
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/**
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* Enables search toggling behavior in a header given a toggle element (e.g.
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* search icon). When the toggle element is clicked, a class,
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* `SEARCH_VISIBLE_CLASS`, will be applied to a header matching the selector
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* `HEADER_SELECTOR` and the input inside the element, SEARCH_BOX_SELECTOR, will
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* be focused. This class can be used in CSS to show/hide the necessary
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* elements. When the user clicks outside of SEARCH_BOX_SELECTOR, the class will
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* be removed.
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*
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* @param {HTMLElement|Element} searchToggle
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*/
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module.exports = function initSearchToggle( searchToggle ) {
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const header =
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/** @type {HTMLElement|null} */ ( searchToggle.closest( HEADER_SELECTOR ) );
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if ( !header ) {
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return;
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}
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const searchBox =
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/** @type {HTMLElement|null} */ ( header.querySelector( SEARCH_BOX_SELECTOR ) );
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if ( !searchBox ) {
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return;
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}
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bindToggleClickHandler( searchBox, header, searchToggle );
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};
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