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/******/ "use strict"; |
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/* unused harmony export default */ |
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/** |
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* Allows to open/close the language switcher's submenus when the "dropdown" layout is used. |
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*/ |
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|
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class Dropdown { |
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/** |
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* Attaches events to the dropdown's elements. |
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* |
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* @param {HTMLElement} button The button that opens/closes the dropdown. |
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*/ |
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constructor( button ) { |
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this.button = button; |
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this.closeOnClickOutsideBinded = this.closeOnClickOutside.bind( this ); |
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|
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button.setAttribute( 'aria-expanded', 'false' ); |
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|
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button.parentNode.addEventListener( |
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'mouseenter', |
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this.open.bind( this ) |
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); |
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button.parentNode.addEventListener( |
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'mouseleave', |
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this.close.bind( this ) |
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); |
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button.addEventListener( 'click', this.toggle.bind( this ) ); |
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button.nextElementSibling.addEventListener( |
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'keydown', |
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this.closeOnListKeydown.bind( this ) |
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); |
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button.nextElementSibling |
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.querySelector( 'li:last-child > a' ) |
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.addEventListener( 'blur', this.closeOnLastLinkBlur.bind( this ) ); |
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} |
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|
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/** |
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* Opens the submenu. |
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*/ |
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open() { |
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this.button.setAttribute( 'aria-expanded', 'true' ); |
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document.addEventListener( 'click', this.closeOnClickOutsideBinded ); |
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} |
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|
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/** |
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* Closes the submenu. |
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*/ |
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close() { |
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this.button.setAttribute( 'aria-expanded', 'false' ); |
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document.removeEventListener( 'click', this.closeOnClickOutsideBinded ); |
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} |
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|
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/** |
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* Toggles the submenu. |
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*/ |
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toggle() { |
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const expanded = this.button.getAttribute( 'aria-expanded' ); |
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if ( 'true' === expanded ) { |
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this.close(); |
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} else { |
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this.open(); |
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} |
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} |
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|
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/** |
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* Event callback that closes the submenu when pressing the Escape key while in the list. |
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* |
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* @param {Event} event The event. |
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*/ |
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closeOnListKeydown( event ) { |
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if ( event.key === 'Escape' ) { |
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this.button.focus(); |
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this.close(); |
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} |
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} |
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|
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/** |
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* Event callback that closes the submenu when the last link in the list looses focus (to a target outside the list). |
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* |
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* @param {Event} event The event. |
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*/ |
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closeOnLastLinkBlur( event ) { |
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if ( ! this.button.parentNode.contains( event.relatedTarget ) ) { |
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this.close(); |
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} |
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} |
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|
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/** |
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* Event callback that closes the submenu when the user clicks outside the dropdown. |
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* |
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* @param {Event} event The event. |
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*/ |
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closeOnClickOutside( event ) { |
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if ( ! this.button.parentNode.contains( event.target ) ) { |
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this.close(); |
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} |
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} |
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} |
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|
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