90 lines
3.3 KiB
JavaScript
90 lines
3.3 KiB
JavaScript
var edx = edx || {};
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(function($) {
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'use strict';
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edx.dashboard = edx.dashboard || {};
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edx.dashboard.dropdown = {};
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// Generate the properties object to be passed along with business intelligence events.
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edx.dashboard.dropdown.toggleCourseActionsDropdownMenu = function(event) {
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// define variables for code legibility
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var dashboardIndex = $(event.currentTarget).data().dashboardIndex,
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dropdown = $('#actions-dropdown-' + dashboardIndex),
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dropdownButton = $('#actions-dropdown-link-' + dashboardIndex),
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ariaExpandedState = (dropdownButton.attr('aria-expanded') === 'true'),
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menuItems = dropdown.find('a');
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var catchKeyPress = function(object, event) {
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// get currently focused item
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var focusedItem = $(':focus');
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// get the index of the currently focused item
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var focusedItemIndex = menuItems.index(focusedItem);
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// var to store next focused item index
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var itemToFocusIndex;
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// if space or escape key pressed
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if (event.which === 32 || event.which === 27) {
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dropdownButton.click();
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event.preventDefault();
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}
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// if up arrow key pressed or shift+tab
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else if (event.which === 38 || (event.which === 9 && event.shiftKey)) {
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// if first item go to last
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if (focusedItemIndex === 0 || focusedItemIndex === -1) {
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menuItems.last().focus();
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} else {
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itemToFocusIndex = focusedItemIndex - 1;
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menuItems.get(itemToFocusIndex).focus();
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}
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event.preventDefault();
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}
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// if down arrow key pressed or tab key
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else if (event.which === 40 || event.which === 9) {
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// if last item go to first
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if (focusedItemIndex === menuItems.length - 1 || focusedItemIndex === -1) {
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menuItems.first().focus();
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} else {
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itemToFocusIndex = focusedItemIndex + 1;
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menuItems.get(itemToFocusIndex).focus();
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}
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event.preventDefault();
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}
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};
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// Toggle the visibility control for the selected element and set the focus
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dropdown.toggleClass('is-visible');
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if (dropdown.hasClass('is-visible')) {
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dropdown.attr('tabindex', -1);
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dropdown.focus();
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} else {
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dropdown.removeAttr('tabindex');
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dropdownButton.focus();
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}
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// Inform the ARIA framework that the dropdown has been expanded
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dropdownButton.attr('aria-expanded', !ariaExpandedState);
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// catch keypresses when inside dropdownMenu (we want to catch spacebar;
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// escape; up arrow or shift+tab; and down arrow or tab)
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dropdown.on('keydown', function(event) {
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catchKeyPress($(this), event);
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});
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};
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edx.dashboard.dropdown.bindToggleButtons = function() {
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$('.action-more').bind(
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'click',
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edx.dashboard.dropdown.toggleCourseActionsDropdownMenu
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);
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};
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$(document).ready(function() {
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edx.dashboard.dropdown.bindToggleButtons();
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});
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})(jQuery);
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