SchedA11yFixes.user.js

// ==UserScript==
// @name           Sched Accessibility Fixes
// @namespace      http://axSgrease.nvaccess.org/
// @description    Improves the accessibility of Sched.
// @author         James Teh <jteh@mozilla.com>
// @copyright 2019-2022 Mozilla Corporation, Derek Riemer
// @license Mozilla Public License version 2.0
// @version        2022.1
// @include https://*.sched.com/*
// ==/UserScript==

/*** Functions for common tweaks. ***/

function makeHeading(el, level) {
	el.setAttribute("role", "heading");
	el.setAttribute("aria-level", level);
}

function makeRegion(el, label) {
	el.setAttribute("role", "region");
	el.setAttribute("aria-label", label);
}

function makeButton(el, label) {
	el.setAttribute("role", "button");
	if (label) {
		el.setAttribute("aria-label", label);
	}
}

function makePresentational(el) {
	el.setAttribute("role", "presentation");
}

function setLabel(el, label) {
	el.setAttribute("aria-label", label);
}

function makeHidden(el) {
	el.setAttribute("aria-hidden", "true");
}

function setExpanded(el, expanded) {
	el.setAttribute("aria-expanded", expanded ? "true" : "false");
}

var idCounter = 0;
// Get a node's id. If it doesn't have one, make and set one first.
function setAriaIdIfNecessary(elem) {
	if (!elem.id) {
		elem.setAttribute("id", "axsg-" + idCounter++);
	}
	return elem.id;
}

function makeElementOwn(parentElement, listOfNodes){
	ids = [];
	for(let node of listOfNodes){
		ids.push(setAriaIdIfNecessary(node));
	}
	parentElement.setAttribute("aria-owns", ids.join(" "));
}

// Focus something even if it wasn't made focusable by the author.
function forceFocus(el) {
	let focusable = el.hasAttribute("tabindex");
	if (focusable) {
		el.focus();
		return;
	}
	el.setAttribute("tabindex", "-1");
	el.focus();
}

/*** Code to apply the tweaks when appropriate. ***/

function applyTweak(el, tweak) {
	if (Array.isArray(tweak.tweak)) {
		let [func, ...args] = tweak.tweak;
		func(el, ...args);
	} else {
		tweak.tweak(el);
	}
}

function applyTweaks(root, tweaks, checkRoot) {
	for (let tweak of tweaks) {
		for (let el of root.querySelectorAll(tweak.selector)) {
			try {
				applyTweak(el, tweak);
			} catch (e) {
				console.log("Exception while applying tweak for '" + tweak.selector + "': " + e);
			}
		}
		if (checkRoot && root.matches(tweak.selector)) {
			try {
				applyTweak(root, tweak);
			} catch (e) {
				console.log("Exception while applying tweak for '" + tweak.selector + "': " + e);
			}
		}
	}
}

let observer = new MutationObserver(function(mutations) {
	for (let mutation of mutations) {
		try {
			if (mutation.type === "childList") {
				for (let node of mutation.addedNodes) {
					if (node.nodeType != Node.ELEMENT_NODE) {
						continue;
					}
					applyTweaks(node, DYNAMIC_TWEAKS, true);
				}
			} else if (mutation.type === "attributes") {
				applyTweaks(mutation.target, DYNAMIC_TWEAKS, true);
			}
		} catch (e) {
			// Catch exceptions for individual mutations so other mutations are still handled.
			console.log("Exception while handling mutation: " + e);
		}
	}
});

function init() {
	applyTweaks(document, LOAD_TWEAKS, false);
	applyTweaks(document, DYNAMIC_TWEAKS, false);
	options = {childList: true, subtree: true};
	if (DYNAMIC_TWEAK_ATTRIBS.length > 0) {
		options.attributes = true;
		options.attributeFilter = DYNAMIC_TWEAK_ATTRIBS;
	}
	observer.observe(document, options);
}

/*** Define the actual tweaks. ***/

// Tweaks that only need to be applied on load.
const LOAD_TWEAKS = [
	{selector: '#sched-logo a',
		tweak: [setLabel, "Home"]},
	{selector: '.sched-share-mobile',
		tweak: [setLabel, "Mobile App + iCal"]},
	{selector: '.sched-container-header',
		tweak: [makeHeading, 2]},
	// Text on event pages which says "Click here to add to My Sched". Redundant
	// because clicking it does nothing and the actual button is labeled below.
	{selector: '#add-reminder',
		tweak: makeHidden},
	// Avatars are unlabelled. They have tool tips, but they get assigned to
	// aria-describedby and only after mouse hover.
	// Fortunately, the tool tip text is stored in an "oldtitle" attribute.
	{selector: '.sched-avatar',
		tweak: el => {
			let label = el.getAttribute("oldtitle");
			if (label) {
				el.setAttribute("aria-label", label);
			}
		}},
	{selector: '.pinned',
		tweak: el => el.setAttribute("aria-description", "pinned")},
]

// Attributes that should be watched for changes and cause dynamic tweaks to be
// applied.
const DYNAMIC_TWEAK_ATTRIBS = ["class"];

// Tweaks that must be applied whenever a node is added/changed.
const DYNAMIC_TWEAKS = [
	{selector: ':not(.sub)>.ev-save',
		tweak: [makeButton, "Add to My Sched"]},
	{selector: '.sub>.ev-save',
		tweak: [makeButton, "Remove from My Sched"]},
	{selector: '.dropdown:not(.open)>.dropdown-toggle',
		tweak: [setExpanded, false]},
	{selector: '.dropdown.open>.dropdown-toggle',
		tweak: [setExpanded, true]},
]

/*** Lights, camera, action! ***/
init();