100 lines
3.0 KiB
JavaScript
100 lines
3.0 KiB
JavaScript
( function () {
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var
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/** The component selector. */
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selector = '.toggle-list',
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/** The visible label icon associated with the checkbox. */
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toggleSelector = '.toggle-list__toggle',
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/** The underlying hidden checkbox that controls list visibility. */
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checkboxSelector = '.toggle-list__checkbox',
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listSelector = '.toggle-list__list';
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/**
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* Automatically dismiss the list when clicking or focusing elsewhere and update the
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* aria-expanded attribute based on list visibility.
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* @param {Window} window
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* @param {HTMLElement} component
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* @param {OO.EventEmitter} eventBus
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* @param {boolean} [resize] If true, resize the menu on scroll and window resize.
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* @return {void}
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*/
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function bind( window, component, eventBus, resize ) {
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var
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toggle = component.querySelector( toggleSelector ),
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checkbox = /** @type {HTMLInputElement} */ (
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component.querySelector( checkboxSelector )
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),
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list = component.querySelector( listSelector );
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window.addEventListener( 'click', function ( event ) {
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if ( event.target !== toggle && event.target !== checkbox ) {
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// Something besides the button or checkbox was tapped. Dismiss the list.
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_dismiss( checkbox );
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}
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}, true );
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// If focus is given to any element outside the list, dismiss the list. Setting a focusout
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// listener on list would be preferable, but this interferes with the click listener.
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window.addEventListener( 'focusin', function ( event ) {
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if ( event.target instanceof Node && !component.contains( event.target ) ) {
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// Something besides the button or checkbox was focused. Dismiss the list.
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_dismiss( checkbox );
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}
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}, true );
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checkbox.addEventListener( 'change', _updateAriaExpanded.bind( undefined, checkbox ) );
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if ( resize ) {
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eventBus.on( 'scroll:throttled', _resize.bind( undefined, list ) );
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eventBus.on( 'resize:throttled', _resize.bind( undefined, list ) );
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}
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}
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/**
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* @param {HTMLElement} component
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* @param {boolean} [resize] If true, resize the menu to fit within the window.
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* @return {void}
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*/
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function render( component, resize ) {
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var list = /** @type {HTMLElement} */ ( component.querySelector( listSelector ) );
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if ( resize ) {
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_resize( list );
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}
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}
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/**
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* Hides the list.
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* @param {HTMLInputElement} checkbox
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* @return {void}
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*/
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function _dismiss( checkbox ) {
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checkbox.checked = false;
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_updateAriaExpanded( checkbox );
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}
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/**
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* @param {HTMLElement} list
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* @return {void}
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*/
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function _resize( list ) {
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var rect = list.getClientRects()[ 0 ];
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if ( rect ) {
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list.style.maxHeight = window.document.documentElement.clientHeight - rect.top + 'px';
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}
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}
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/**
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* Revise the aria-expanded state to match the checked state.
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* @param {HTMLInputElement} checkbox
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* @return {void}
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*/
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function _updateAriaExpanded( checkbox ) {
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checkbox.setAttribute( 'aria-expanded', ( !!checkbox.checked ).toString() );
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}
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module.exports = Object.freeze( {
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selector: selector,
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render: render,
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bind: bind
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} );
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}() );
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