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edx-platform
Commit 118afcd3 by Jareer Ahsan Committed by Jareer Ahsan
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ECOM-4945 Fixed Shift-Tab on menu 

TNL-5437 Reverted to no RequireJS
parent e6b5cc9e
Showing with 78 additions and 72 deletions
lms/static/js/my_courses_dropdown.js
(function(require) {
$(document).ready(function() {
'use strict';
require([
'jquery',
'edx-ui-toolkit/js/utils/constants'
], function($, constants) {
// define variables for code legibility
var $dropdownMenuToggle = $('.dropdown');
var $dropdownMenu = $('.dropdown-menu');
var menuItems = $dropdownMenu.find('.dropdown-menuitem');
// define variables for code legibility
var $dropdownMenuToggle = $('.dropdown');
var $dropdownMenu = $('.dropdown-menu');
var menuItems = $dropdownMenu.find('.dropdown-menuitem');
// bind menu toggle click for later use
$dropdownMenuToggle.toggle(function() {
$dropdownMenu.addClass('expanded').find('.dropdown-menuitem').first()
.focus();
$dropdownMenuToggle.addClass('active').attr('aria-expanded', 'true');
}, function() {
$dropdownMenu.removeClass('expanded');
$dropdownMenuToggle.removeClass('active').attr('aria-expanded', 'false').focus();
});
var keyCodes = {
leftArrow: 37,
upArrow: 38,
rightArrow: 39,
downArrow: 40,
tab: 9,
escape: 27,
space: 32
};
// catch keypresses when focused on dropdownMenuToggle (we only care about spacebar keypresses here)
$dropdownMenuToggle.on('keydown', function(event) {
// if space key pressed
if (event.which === constants.keyCodes.space) {
$dropdownMenuToggle.click();
event.preventDefault();
}
});
function catchKeyPress(object, event) {
// get currently focused item
var focusedItem = jQuery(':focus');
// bind menu toggle click for later use
$dropdownMenuToggle.toggle(function() {
$dropdownMenu.addClass('expanded').find('.dropdown-menuitem').first()
.focus();
$dropdownMenuToggle.addClass('active').attr('aria-expanded', 'true');
}, function() {
$dropdownMenu.removeClass('expanded');
$dropdownMenuToggle.removeClass('active').attr('aria-expanded', 'false').focus();
});
// get the number of focusable items
var numberOfMenuItems = menuItems.length;
// catch keypresses when focused on $dropdownMenuToggle (we only care about spacebar keypresses here)
$dropdownMenuToggle.on('keydown', function(event) {
// if space key pressed
if (event.which === keyCodes.space) {
$dropdownMenuToggle.click();
event.preventDefault();
}
});
// get the index of the currently focused item
var focusedItemIndex = menuItems.index(focusedItem);
function catchKeyPress(object, event) {
// get currently focused item
var focusedItem = jQuery(':focus');
// var to store next focused item index
var itemToFocusIndex;
// get the number of focusable items
var numberOfMenuItems = menuItems.length;
// if space key pressed
if (event.which === constants.keyCodes.space) {
$dropdownMenuToggle.click();
event.preventDefault();
}
// get the index of the currently focused item
var focusedItemIndex = menuItems.index(focusedItem);
// if escape key pressed
if (event.which === constants.keyCodes.esc) {
$dropdownMenuToggle.click();
event.preventDefault();
}
// var to store next focused item index
var itemToFocusIndex;
// if up arrow key pressed or shift+tab else down key or tab is pressed
if (event.which === constants.keyCodes.up || event.which === constants.keyCodes.left ||
(event.which === constants.keyCodes.tab && event.shiftKey)) {
// if first item go to last
if (focusedItemIndex === 0) {
menuItems.last().focus();
} else {
itemToFocusIndex = focusedItemIndex - 1;
menuItems.get(itemToFocusIndex).focus();
}
event.preventDefault();
} else if (event.which === constants.keyCodes.down || event.which === constants.keyCodes.right ||
event.which === constants.keyCodes.tab) {
// if last item go to first
if (focusedItemIndex === numberOfMenuItems - 1) {
menuItems.first().focus();
} else {
itemToFocusIndex = focusedItemIndex + 1;
menuItems.get(itemToFocusIndex).focus();
}
event.preventDefault();
// if space key pressed
if (event.which === keyCodes.space) {
$dropdownMenuToggle.click();
event.preventDefault();
}
// if escape key pressed
if (event.which === keyCodes.escape) {
$dropdownMenuToggle.click();
event.preventDefault();
}
// if up arrow key pressed or shift+tab else down key or tab is pressed
if (event.which === keyCodes.upArrow || event.which === keyCodes.leftArrow ||
(event.which === keyCodes.tab && event.shiftKey)) {
// if first item go to last
if (focusedItemIndex === 0) {
menuItems.last().focus();
} else {
itemToFocusIndex = focusedItemIndex - 1;
menuItems.get(itemToFocusIndex).focus();
}
event.preventDefault();
} else if (event.which === keyCodes.downArrow || event.which === keyCodes.rightArrow ||
event.which === keyCodes.tab) {
// if last item go to first
if (focusedItemIndex === numberOfMenuItems - 1) {
menuItems.first().focus();
} else {
itemToFocusIndex = focusedItemIndex + 1;
menuItems.get(itemToFocusIndex).focus();
}
event.preventDefault();
}
}
// catch keypresses when inside dropdownMenu
// (we want to catch spacebar; escape; up arrow or shift+tab; and down arrow or tab)
$dropdownMenu.on('keydown', function(event) {
catchKeyPress($(this), event);
});
// catch keypresses when inside $dropdownMenu
// (we want to catch spacebar; escape; up arrow or shift+tab; and down arrow or tab)
$dropdownMenu.on('keydown', function(event) {
catchKeyPress($(this), event);
});
}).call(this, require || RequireJS.require);
});
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