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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This Source Code Form is "Incompatible With Secondary Licenses", as
* defined by the Mozilla Public License, v. 2.0. */
$(function() {
'use strict';
$(window).click(function(e) {
// clicking dropdown button opens or closes the dropdown content
if (!$(e.target).hasClass('dropdown-button')) {
$('.dropdown-button').each(function() {
toggleDropDown(e, $(this), $('#' + $(this).attr('aria-controls')), 1);
});
}
}).keydown(function(e) {
// Escape key hides the dropdown if visible
if (e.keyCode == 27) {
$('.dropdown-button').each(function() {
var $button = $(this);
if ($button.siblings('.dropdown-content').is(':visible')) {
toggleDropDown(e, $button, $('#' + $button.attr('aria-controls')), 1);
$button.focus();
}
});
}
// allow arrow up and down keys to choose one of the dropdown items if menu visible
if (e.keyCode == 38 || e.keyCode == 40) {
$('.dropdown-content').each(function() {
var $content = $(this);
if ($content.is(':visible')) {
e.preventDefault();
e.stopPropagation();
var $li = $content.find('li');
// if none focused select the first or last
var $any_focused = $content.find('a:focus');
if ($any_focused.length == 0) {
var index = e.keyCode == 40 ? 0 : $li.length - 1;
var $link = $li.eq(index).find('a');
$link.addClass('active').focus();
return;
}
// otherwise move up or down the list based on arrow key pressed
var inc = e.keyCode == 40 ? 1 : -1;
var move = $content.find('a:focus').parent('li').index() + inc;
var $link = $li.eq(move % $li.length).find('a');
$content.find('a').removeClass('active');
$link.addClass('active').focus();
}
});
}
// enter clicks on a link
if (e.keyCode == 13) {
$('.dropdown-content:visible a.active').trigger('click');
}
});
$('.dropdown-content a').hover(
function(){ $(this).addClass('active') },
function(){ $(this).removeClass('active') }
);
$('.dropdown').each(function() {
var $div = $(this);
var $button = $div.find('.dropdown-button');
var $content = $div.find('.dropdown-content');
$button.click(function(e) {
toggleDropDown(e, $button, $content);
}).keydown(function(e) {
// allow enter to toggle menu
if (e.keyCode == 13) {
toggleDropDown(e, $button, $content);
}
});
});
function toggleDropDown(e, $button, $content, hide_only) {
// clear all active links
$content.find('a').removeClass('active');
if ($content.is(':visible')) {
$content.hide();
$button.attr('aria-expanded', false);
}
// if not using Escape or clicking outside the dropdown div, then we are hiding
else if (!hide_only) {
$content.show();
$button.attr('aria-expanded', true);
}
}
});
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