Keeps keyboard focus on the lesson input field
// ==UserScript==
// @name WaniKani Keyboard Focus
// @author Brian Frichette
// @description Keeps keyboard focus on the lesson input field
// @license MIT
// @match https://www.wanikani.com/subjects/*
// @match https://www.wanikani.com/subject-lessons/*
// @run-at document-idle
// @supportURL https://github.com/bfricka/wk-keyboard-focus
// @version 1.2.1
// @namespace bfricka
// ==/UserScript==
;(() => {
'use strict'
let debug = false
const SUBTREE = { childList: true, subtree: true }
const isElement = (node) => node?.nodeType === 1
const hasClass = (node, cls) => isElement(node) && node.classList.contains(cls)
const noop = () => {}
const getAttr = (el, attr) => el.attributes.getNamedItem(attr)
const getAttrVal = (el, attr) => getAttr(el, attr)?.value
const log = (...v) => {
if (debug) console.log('[WK-KB-FOCUS]', ...v)
}
let State
;(function (State) {
State[(State['MAIN'] = 0)] = 'MAIN'
State[(State['MODAL'] = 1)] = 'MODAL'
State[(State['NOTES'] = 2)] = 'NOTES'
State[(State['POINTER'] = 3)] = 'POINTER'
State[(State['LESSON_MODAL'] = 4)] = 'LESSON_MODAL'
State[(State['WK_OPEN_FRAMEWORK'] = 5)] = 'WK_OPEN_FRAMEWORK'
})(State || (State = {}))
const state = (() => {
const enabledStates = Object.keys(State).map(() => true)
return {
disable(state, disable = true) {
log('disabling', State[state])
enabledStates[state] = !disable
},
enable(state, enabled = true) {
log('enabling', State[state])
enabledStates[state] = enabled
},
isEnabled: (state) => {
if (state != null) return enabledStates[state]
return enabledStates.every((v) => v)
},
}
})()
class WKObserver {
#cb = noop
#cleanup = noop
#isRunning = false
#observer = new MutationObserver((items) => {
for (const item of items) {
if (this.#cb(item) === false) return
}
})
get running() {
return this.#isRunning
}
dispose = () => {
this.#cb = noop
this.#observer.disconnect()
this.#isRunning = false
this.#cleanup()
return this
}
init = ($el, cb, opts, cleanup = noop) => {
this.#cleanup = cleanup
this.dispose()
this.#cb = cb
this.#observer.observe($el, opts)
this.#isRunning = true
return this
}
}
const Observers = {
info: new WKObserver(),
meaningNotes: new WKObserver(),
modal: new WKObserver(),
modalInput: new WKObserver(),
quizQueue: new WKObserver(),
readingNotes: new WKObserver(),
turbo: new WKObserver(),
wkofDiaglogBg: new WKObserver(),
}
const disposeAll = () => {
log('Disposing all observers and stopping')
Object.values(Observers).forEach((o) => o.dispose())
}
const createEventDelegateListener = (matcher, listener) => (ev) => {
if (matcher(ev)) listener(ev)
}
const clsDelegateListener = (className, listener) =>
createEventDelegateListener((ev) => {
let currentNode = ev.target
while (currentNode) {
if (currentNode.classList.contains(className)) return true
currentNode = currentNode.parentElement
}
return false
}, listener)
const BodyDelegate = (() => {
const bodyListenerMap = {}
const listenerMapCapture = {}
const listenerMap = {}
const dispose = () => {
for (const [k, listener] of Object.entries(bodyListenerMap)) {
const [type, captureStr] = k.split('|')
const capture = captureStr === 'true'
document.body.removeEventListener(type, listener, { capture })
}
}
const on = (type, listener, capture = false) => {
const lm = capture ? listenerMapCapture : listenerMap
let listeners = lm[type]
if (!listeners) {
listeners = lm[type] = new Set()
const bodyListener = (bodyListenerMap[`${type}|${capture}`] = (ev) => {
if (state.isEnabled(State.MAIN)) listeners.forEach((l) => l(ev))
})
document.body.addEventListener(type, bodyListener, { capture })
}
listeners.add(listener)
}
const off = (type, listener, capture = false) => {
const listeners = (capture ? listenerMapCapture : listenerMap)[type]
if (!listeners) return
listeners.delete(listener)
if (!listeners.size) {
const bodyListener = bodyListenerMap[`${type}|${capture}`]
if (bodyListener) {
document.body.removeEventListener(type, bodyListener, { capture })
}
}
}
return { dispose, on, off }
})()
// Relative position container
const addGlassesBtn = (() => {
const $btn = document.createElement('button')
$btn.type = 'button'
$btn.classList.add('wk-focus__btn')
$btn.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path class="wk-focus__glasses-icon" d="M224 232a32 32 0 0164 0M448 200h16M64 200H48M64 200c0 96 16 128 80 128s80-32 80-128c0 0-16-16-80-16s-80 16-80 16zM448 200c0 96-16 128-80 128s-80-32-80-128c0 0 16-16 80-16s80 16 80 16z" fill="none" stroke-linecap="round" stroke-linejoin="round" stroke-width="32"/></svg>`
const $styles = document.createElement('style')
$styles.textContent = `
.wk-focus__btn {
position: absolute;
height: 1.5rem;
width: 1.5rem;
top: 50%;
left: 1.5rem;
transform: translateY(-50%);
appearance: none;
background: none;
cursor: pointer;
}
.wk-focus__btn.wk-focus__fade {
opacity: 0.5;
}
.wk-focus__glasses-icon {
stroke: #111;
}
.quiz-input__input-container[correct=true] .wk-focus__glasses-icon,
.quiz-input__input-container[correct=false] .wk-focus__glasses-icon {
stroke: #fff;
}`
let handler = noop
const dispose = () => {
$btn.removeEventListener('click', handler)
$btn.remove()
$styles.remove()
handler = noop
}
const toggleEnabled = (overrideEnable) => {
const shouldEnable = overrideEnable ?? !state.isEnabled(State.MAIN)
if (shouldEnable) state.enable(State.MAIN)
else state.disable(State.MAIN)
$btn.classList.toggle('wk-focus__fade', !shouldEnable)
}
return ($inputOffsetParent) => {
dispose()
$inputOffsetParent.append($btn)
document.body.append($styles)
let clicks = 0
let timeoutId = -1
handler = (ev) => {
clicks++
ev.preventDefault()
toggleEnabled()
inputManager.focus()
clearTimeout(timeoutId)
timeoutId = setTimeout(() => {
clicks = 0
}, 500)
if (clicks >= 4) {
clicks = 0
debug = !debug
clearTimeout(timeoutId)
toggleEnabled(true)
console.log('[WK-KB-FOCUS]', 'Toggling debug', debug)
}
}
$btn.addEventListener('click', handler)
}
})()
const initModalObserver = ($modal) => {
log('Initializing modal observer')
const findAutofocusInput = () => [...$modal.querySelectorAll('input')].find(($i) => $i.autofocus)
const foundAndFocused = () => {
const $autofocusInput = findAutofocusInput()
if ($autofocusInput) {
$autofocusInput.focus()
Observers.modalInput.dispose()
log('Found modal autofocus input', $autofocusInput)
return true
}
log('Could not find modal autofocus input')
return false
}
const initInputObserverAndFocus = () => {
if (Observers.modalInput.running || foundAndFocused()) return
Observers.modalInput.init(
$modal,
(item) => {
if (item.addedNodes.length) return !foundAndFocused()
},
SUBTREE,
)
}
Observers.modalInput.dispose()
Observers.modal.init(
$modal,
(item) => {
const $el = item.target
if (!(isElement($el) && item.attributeName === 'hidden')) return
if ($el.hidden) {
Observers.modalInput.dispose()
state.enable(State.MODAL)
inputManager.focus()
log('Modal hidden. Re-setting focus')
return
}
log('Modal visible. Trying to find autofocus input.')
state.disable(State.MODAL)
initInputObserverAndFocus()
},
{ attributeFilter: ['hidden'] },
)
}
const initInfoObserver = ($subjectInfo) => {
log('Initializing subject info observer')
let lastSrc = ''
const findNoteForm = (nodes) =>
[...nodes].find((node) => isElement(node) && node.classList.contains('user-note__form'))
const initNoteObserver = ($notesEl, observer) => {
if (!$notesEl) {
observer.dispose()
return
}
if (observer.running) return
observer.init(
$notesEl,
({ addedNodes, removedNodes }) => {
const $addedNoteForm = findNoteForm(addedNodes)
if ($addedNoteForm) {
state.disable(State.NOTES)
$addedNoteForm.querySelector('textarea.user-note__input')?.focus()
return false
}
if (findNoteForm(removedNodes)) {
state.enable(State.NOTES)
inputManager.focus()
return false
}
},
SUBTREE,
)
}
Observers.meaningNotes.dispose()
Observers.readingNotes.dispose()
Observers.info.init(
$subjectInfo,
({ attributeName, target }) => {
if (!attributeName || !isElement(target)) return
const rawValue = getAttrVal(target, attributeName)
const isLoaded = rawValue === 'true'
if (isLoaded) {
initNoteObserver(document.getElementById('user_meaning_note'), Observers.meaningNotes)
initNoteObserver(document.getElementById('user_reading_note'), Observers.readingNotes)
} else {
Observers.meaningNotes.dispose()
Observers.readingNotes.dispose()
}
},
{ attributeFilter: ['data-loaded'] },
)
}
const initQuizQueueObserver = ($quizQueue) => {
log('Initializing quiz queue observer')
const findLessonModal = (nodes) =>
[...nodes].find((node) => isElement(node) && node.classList.contains('lesson-modal'))
Observers.quizQueue.init(
$quizQueue,
(item) => {
const $addedLessonModal = findLessonModal(item.addedNodes)
if ($addedLessonModal) {
const $nextBtn = $addedLessonModal.querySelector(
'.lesson-modal__button[data-default="true"] > a',
)
state.disable(State.LESSON_MODAL)
$nextBtn?.focus()
return false
}
const $removedLessonModal = findLessonModal(item.removedNodes)
if ($removedLessonModal) {
$quizQueue.focus()
state.enable(State.LESSON_MODAL)
}
},
SUBTREE,
() => {
// We can be disposed before the removal observer fires, so we reset on dispose
state.enable(State.LESSON_MODAL)
},
)
}
const inputManager = (() => {
let $input = null
let $inputOffsetParent = null
let $scrollContainer = null
let focusInput = null
const getScroll = () => {
if ($scrollContainer) return $scrollContainer
$scrollContainer = document.querySelector('[data-controller=scrollable]')
return $scrollContainer || document.body
}
const dispose = () => {
BodyDelegate.dispose()
$input = null
$inputOffsetParent = null
$scrollContainer = null
focusInput = null
}
const init = ($initInput) => {
log('Initializing input manager')
dispose()
$input = $initInput
$inputOffsetParent = $initInput.offsetParent
focusInput = () => {
const scrollPos = getScroll().scrollTop
$input?.focus()
getScroll().scrollTop = scrollPos
}
addGlassesBtn($inputOffsetParent)
const disable = () => state.disable(State.POINTER)
const enableTimeout = () =>
setTimeout(() => {
log('Re-enabling focus after pointer')
state.enable(State.POINTER)
if (state.isEnabled()) focusInput?.()
})
;[
'subject-collocations__pattern-name',
'subject-section__toggle',
'user-synonyms__buttons',
].forEach((cls) => {
// Disable on pointer down so we can blur
BodyDelegate.on('pointerdown', clsDelegateListener(cls, disable), true)
// Re-enable + focus on pointer up
BodyDelegate.on('pointercancel', clsDelegateListener(cls, enableTimeout), true)
BodyDelegate.on('pointerup', clsDelegateListener(cls, enableTimeout), true)
})
$input.addEventListener('blur', () => {
const isEnabled = state.isEnabled()
log('Input blur', isEnabled)
if (isEnabled) focusInput?.()
})
focusInput()
}
const update = ($nextInput) => {
if ($nextInput) {
if (!$input) init($nextInput)
return
}
if ($input) dispose()
}
return {
focus() {
focusInput?.()
},
get running() {
return Boolean(focusInput)
},
update,
}
})()
const initTurboObserver = ($turboBody) => {
disposeAll()
const updateUserInput = () => {
// Main input element for answers
inputManager.update(document.getElementById('user-response'))
}
const updateQuizQueue = () => {
// Contains lesson modal ("Next batch, please!")
const $quizQueue = document.getElementById('quiz-queue')
if ($quizQueue) {
Observers.quizQueue.running || initQuizQueueObserver($quizQueue)
} else if (Observers.quizQueue.running) {
state.enable(State.LESSON_MODAL)
Observers.quizQueue.dispose()
}
}
const updateSubjectInfo = () => {
// Main "additional information" turbo module
const $subjectInfo = document.getElementById('subject-info')
if ($subjectInfo) {
Observers.info.running || initInfoObserver($subjectInfo)
} else if (Observers.info.running) {
state.enable(State.NOTES)
Observers.info.dispose()
}
}
const isEgg = (node) => isElement(node) && node.id === 'egg_timer'
Observers.turbo.init(
$turboBody,
(item) => {
// Superfluous egg timer runs every second
if (isEgg(item.target)) return
updateUserInput()
updateQuizQueue()
updateSubjectInfo()
for (const node of item.addedNodes) {
if (hasClass(node, 'wk-modal')) {
initModalObserver(node)
break
}
}
for (const node of item.removedNodes) {
if (hasClass(node, 'wk-modal')) {
state.enable(State.MODAL)
Observers.modal.dispose()
}
}
},
SUBTREE,
)
updateUserInput()
updateQuizQueue()
updateSubjectInfo()
const $modal = document.querySelector('.wk-modal')
$modal && initModalObserver($modal)
}
const initWkofDialogObserver = ($wkofDialogBg) => {
log('Init WaniKani Open Framework backdrop observer')
const DIALOG_REF_COUNT_ATTR = 'refcnt'
const tryFocusDialogInput = ($el) => {
const dialogTextInputs = $el.nextElementSibling?.querySelectorAll('input[type="text"]')
if (dialogTextInputs) {
for (const $input of dialogTextInputs) {
if ($input.autofocus) {
$input.focus()
return
}
}
// If we don't find an autofocus input, try to focus the first one
dialogTextInputs[0]?.focus()
}
}
const handleWkofDialogChange = ($el) => {
const dialogRefCount = Number.parseInt(getAttrVal($el, DIALOG_REF_COUNT_ATTR) || '0')
const isEnabled = state.isEnabled(State.WK_OPEN_FRAMEWORK)
if (dialogRefCount && isEnabled) {
state.disable(State.WK_OPEN_FRAMEWORK)
tryFocusDialogInput($el)
}
if (!dialogRefCount && !isEnabled) {
state.enable(State.WK_OPEN_FRAMEWORK)
inputManager.focus()
}
}
Observers.wkofDiaglogBg.init(
$wkofDialogBg,
({ attributeName, target }) => {
if (!(attributeName && isElement(target))) return
handleWkofDialogChange(target)
},
{ attributeFilter: ['refcnt'] },
)
handleWkofDialogChange($wkofDialogBg)
}
const wkFocusRunner = (() => {
let $lastTurboBody = null
let $lastWkofDialogBg = null
return ($turboBody, $wkofDialogBg) => {
if ($turboBody && (!Observers.turbo.running || $lastTurboBody !== $turboBody))
initTurboObserver($turboBody)
if (!$turboBody && Observers.turbo.running) disposeAll()
if ($wkofDialogBg && (!Observers.wkofDiaglogBg.running || $lastWkofDialogBg !== $wkofDialogBg))
initWkofDialogObserver($wkofDialogBg)
if (!$wkofDialogBg && Observers.wkofDiaglogBg.running) Observers.wkofDiaglogBg.dispose()
$lastTurboBody = $turboBody
$lastWkofDialogBg = $wkofDialogBg
}
})()
const updateRunner = () => {
const $turboBody = document.getElementById('turbo-body')
const $wkofDialogBg = document.getElementById('wkofs_bkgd')
wkFocusRunner($turboBody, $wkofDialogBg)
}
setInterval(updateRunner, 200)
updateRunner()
})()
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