Make context menus accessible with keyboard

client/css/style.css

@@ -1981,12 +1981,15 @@ part/quit messages where we don't load previews (adds a blank line otherwise) */
 	transition: background-color 0.2s;
 }
 
+.context-menu-item:focus,
+.textcomplete-item:focus,
 .context-menu-item:hover,
 .textcomplete-item:hover,
 .textcomplete-menu .active,
 #chat .userlist .user.active {
 	background-color: #f6f6f6;
 	transition: none;
+	outline: 0; /* TODO: Handle focus outlines in PR #1873 */
 }
 
 .context-menu-item::before,

client/index.html.tpl

@@ -96,10 +96,7 @@
 			</article>
 		</div>
 
-		<div id="context-menu-container">
-			<ul id="context-menu"></ul>
-		</div>
-
+		<div id="context-menu-container"></div>
 		<div id="image-viewer"></div>
 
 		<script src="js/bundle.vendor.js"></script>

client/js/contextMenu.js

@@ -1,65 +1,134 @@
 "use strict";
+
 const $ = require("jquery");
+const Mousetrap = require("mousetrap");
 const templates = require("../views");
-let contextMenu, contextMenuContainer;
+
+const contextMenuContainer = $("#context-menu-container");
 
 module.exports = class ContextMenu {
 	constructor(contextMenuItems, contextMenuActions, selectedElement, event) {
+		this.previousActiveElement = document.activeElement;
 		this.contextMenuItems = contextMenuItems;
 		this.contextMenuActions = contextMenuActions;
 		this.selectedElement = selectedElement;
 		this.event = event;
-
-		contextMenuContainer = $("#context-menu-container");
-		contextMenu = $("#context-menu");
 	}
 
 	show() {
-		showContextMenu(this.contextMenuItems, this.selectedElement, this.event);
-		this.bindEvents();
+		const contextMenu = showContextMenu(this.contextMenuItems, this.selectedElement, this.event);
+		this.bindEvents(contextMenu);
 		return false;
 	}
 
-	bindEvents() {
+	hide() {
+		contextMenuContainer
+			.hide()
+			.empty()
+			.off(".contextMenu");
+
+		Mousetrap.unbind("escape");
+	}
+
+	bindEvents(contextMenu) {
 		const contextMenuActions = this.contextMenuActions;
 
 		contextMenuActions.execute = (id, ...args) => contextMenuActions[id] && contextMenuActions[id](...args);
 
-		contextMenu.find(".context-menu-item").on("click", function() {
-			const $this = $(this);
-			const itemData = $this.attr("data-data");
-			const contextAction = $this.attr("data-action");
+		const clickItem = (item) => {
+			const itemData = item.attr("data-data");
+			const contextAction = item.attr("data-action");
+
+			this.hide();
+
 			contextMenuActions.execute(contextAction, itemData);
+		};
+
+		contextMenu.on("click", ".context-menu-item", function() {
+			clickItem($(this));
+		});
+
+		const trap = Mousetrap(contextMenu.get(0));
+
+		trap.bind(["up", "down"], (e, key) => {
+			const items = contextMenu.find(".context-menu-item");
+
+			let index = items.toArray().findIndex((item) => $(item).is(":focus"));
+
+			if (key === "down") {
+				index = (index + 1) % items.length;
+			} else {
+				index = Math.max(index, 0) - 1;
+			}
+
+			items.eq(index).trigger("focus");
+		});
+
+		trap.bind("enter", () => {
+			const item = contextMenu.find(".context-menu-item:focus");
+
+			if (item.length) {
+				clickItem(item);
+			}
+
+			return false;
+		});
+
+		// Hide context menu when clicking or right clicking outside of it
+		contextMenuContainer.on("click.contextMenu contextmenu.contextMenu", (e) => {
+			// Do not close the menu when clicking inside of the context menu (e.g. on a divider)
+			if ($(e.target).prop("id") === "context-menu") {
+				return;
+			}
+
+			this.hide();
+			return false;
+		});
+
+		// Hide the context menu when pressing escape within the context menu container
+		Mousetrap.bind("escape", () => {
+			this.hide();
+
+			// Return focus to the previously focused element
+			$(this.previousActiveElement).trigger("focus");
+
+			return false;
 		});
 	}
 };
 
 function showContextMenu(contextMenuItems, selectedElement, event) {
 	const target = $(event.currentTarget);
-	let output = "";
+	const contextMenu = $("<ul>", {id: "context-menu"});
 
 	for (const item of contextMenuItems) {
 		if (item.check(target)) {
 			if (item.divider) {
-				output += templates.contextmenu_divider();
+				contextMenu.append(templates.contextmenu_divider());
 			} else {
-				output += templates.contextmenu_item({
+				contextMenu.append(templates.contextmenu_item({
 					class: typeof item.className === "function" ? item.className(target) : item.className,
 					action: item.actionId,
 					text: typeof item.displayName === "function" ? item.displayName(target) : item.displayName,
 					data: typeof item.data === "function" ? item.data(target) : item.data,
-				});
+				}));
 			}
 		}
 	}
 
-	contextMenuContainer.show();
+	contextMenuContainer
+		.html(contextMenu)
+		.show();
+
 	contextMenu
-		.html(output)
-		.css(positionContextMenu(selectedElement, event));
+		.css(positionContextMenu(contextMenu, selectedElement, event))
+		.find(".context-menu-item:first-child")
+		.trigger("focus");
+
+	return contextMenu;
 }
 
-function positionContextMenu(selectedElement, e) {
+function positionContextMenu(contextMenu, selectedElement, e) {
 	let offset;
 	const menuWidth = contextMenu.outerWidth();
 	const menuHeight = contextMenu.outerHeight();

client/js/keybinds.js

@@ -8,7 +8,6 @@ const form = $("#form");
 const input = $("#input");
 const sidebar = $("#sidebar");
 const windows = $("#windows");
-const contextMenuContainer = $("#context-menu-container");
 
 Mousetrap.bind([
 	"pageup",
@@ -97,12 +96,6 @@ Mousetrap.bind([
 	return false;
 });
 
-Mousetrap.bind([
-	"escape",
-], function() {
-	contextMenuContainer.hide();
-});
-
 const inputTrap = Mousetrap(input.get(0));
 
 function enableHistory() {

client/js/lounge.js

@@ -18,7 +18,6 @@ require("./webpush");
 require("./keybinds");
 require("./clipboard");
 const contextMenuFactory = require("./contextMenuFactory");
-const contextMenuContainer = $("#context-menu-container");
 
 $(function() {
 	const sidebar = $("#sidebar, #footer");
@@ -80,11 +79,6 @@ $(function() {
 		return contextMenuFactory.createContextMenu($(this), e).show();
 	});
 
-	contextMenuContainer.on("click contextmenu", function() {
-		contextMenuContainer.hide();
-		return false;
-	});
-
 	function resetInputHeight(input) {
 		input.style.height = input.style.minHeight;
 	}

client/js/userlist.js

@@ -57,9 +57,9 @@ chat.on("mouseleave", ".userlist .user", function() {
 });
 
 exports.handleKeybinds = function(input) {
-	Mousetrap(input.get(0)).bind(["up", "down"], (e, key) => {
-		e.preventDefault();
+	const trap = Mousetrap(input.get(0));
 
+	trap.bind(["up", "down"], (e, key) => {
 		const userlists = input.closest(".userlist");
 		let userlist;
 
@@ -73,7 +73,7 @@ exports.handleKeybinds = function(input) {
 		const users = userlist.find(".user");
 
 		if (users.length === 0) {
-			return;
+			return false;
 		}
 
 		// Find which item in the array of users is currently selected, if any.
@@ -95,11 +95,13 @@ exports.handleKeybinds = function(input) {
 
 		// Adjust scroll when active item is outside of the visible area
 		utils.scrollIntoViewNicely(userlist.find(".user.active")[0]);
+
+		return false;
 	});
 
 	// When pressing Enter, open the context menu (emit a click) on the active
 	// user
-	Mousetrap(input.get(0)).bind("enter", () => {
+	trap.bind("enter", () => {
 		const user = input.closest(".userlist").find(".user.active");
 
 		if (user.length) {
@@ -109,5 +111,7 @@ exports.handleKeybinds = function(input) {
 			clickEvent.pageY = userOffset.top + user.height();
 			user.trigger(clickEvent);
 		}
+
+		return false;
 	});
 };

client/views/contextmenu_item.tpl

@@ -1,3 +1,3 @@
-<li class="context-menu-item context-menu-{{class}}" data-action="{{action}}"{{#if data}} data-data="{{data}}"{{/if}}>
+<li class="context-menu-item context-menu-{{class}}" data-action="{{action}}"{{#if data}} data-data="{{data}}"{{/if}} tabindex="0">
 	{{text}}
 </li>