Bulk edit your scrobbles for any artist or album on Last.fm at once.
目前為
// ==UserScript==
// @name Last.fm Bulk Edit
// @namespace https://github.com/RudeySH/lastfm-bulk-edit
// @version 0.2.0
// @author Rudey
// @description Bulk edit your scrobbles for any artist or album on Last.fm at once.
// @license GPL-3.0-or-later
// @homepageURL https://github.com/RudeySH/lastfm-bulk-edit
// @icon https://www.last.fm/static/images/lastfm_avatar_twitter.png
// @supportURL https://github.com/RudeySH/lastfm-bulk-edit/issues
// @match https://www.last.fm/*
// @require https://cdnjs.cloudflare.com/ajax/libs/he/1.2.0/he.min.js
// ==/UserScript==
'use strict';
const namespace = 'lastfm-bulk-edit';
// use the top-right link to determine the current user
const authLink = document.querySelector('a.auth-link');
if (!authLink) {
return; // not logged in
}
const libraryURL = `${authLink.href}/library`;
// https://regex101.com/r/KwEMRx/1
const albumRegExp = new RegExp(`^${libraryURL}/music(\\+[^/]*)*(/[^+][^/]*){2}$`);
const artistRegExp = new RegExp(`^${libraryURL}/music(\\+[^/]*)*(/[^+][^/]*){1}$`);
const domParser = new DOMParser();
const editScrobbleMenuItemTemplate = document.createElement('template');
editScrobbleMenuItemTemplate.innerHTML = `
<li>
<form method="POST" action="${libraryURL}/edit?edited-variation=library-track-scrobble" data-edit-scrobble="">
<input type="hidden" name="csrfmiddlewaretoken" value="">
<input type="hidden" name="artist_name" value="">
<input type="hidden" name="track_name" value="">
<input type="hidden" name="album_name" value="">
<input type="hidden" name="album_artist_name" value="">
<input type="hidden" name="timestamp" value="">
<button type="button" class="mimic-link dropdown-menu-clickable-item more-item--edit">
Edit scrobbles
</button>
<button type="submit" class="hidden"></button>
</form>
</li>`;
const modalTemplate = document.createElement('template');
modalTemplate.innerHTML = `
<div class="popup_background"
style="opacity: 0.8; visibility: visible; background-color: rgb(0, 0, 0); position: fixed; top: 0px; right: 0px; bottom: 0px; left: 0px;">
</div>
<div class="popup_wrapper popup_wrapper_visible" style="opacity: 1; visibility: visible; position: fixed; overflow: auto; width: 100%; height: 100%; top: 0px; left: 0px; text-align: center;">
<div class="modal-dialog popup_content" role="dialog" aria-labelledby="modal-label" data-popup-initialized="true" aria-hidden="false" style="opacity: 1; visibility: visible; pointer-events: auto; display: inline-block; outline: none; text-align: left; position: relative; vertical-align: middle;" tabindex="-1">
<div class="modal-content">
<h2 class="modal-title"></h2>
<div class="modal-body"></div>
</div>
</div>
<div class="popup_align" style="display: inline-block; vertical-align: middle; height: 100%;"></div>
</div>`;
initialize();
function initialize() {
appendStyle();
appendEditScrobbleMenuItems(document);
// use MutationObserver because Last.fm is a single-page application
const observer = new MutationObserver(mutations => {
for (const mutation of mutations) {
for (const node of mutation.addedNodes) {
if (node instanceof Element) {
appendEditScrobbleMenuItems(node);
}
}
}
});
observer.observe(document.body, {
childList: true,
subtree: true
});
}
function appendStyle() {
const style = document.createElement('style');
style.innerHTML = `
.${namespace}-abbr {
cursor: pointer;
}
.${namespace}-ellipsis {
display: block;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
.${namespace}-list {
column-count: 2;
}
.${namespace}-loading {
background: url("/static/images/loading_dark_light_64.gif") 50% 50% no-repeat;
height: 64px;
display: flex;
justify-content: center;
align-items: center;
}
.${namespace}-text-info {
color: #2b65d9;
}`;
document.head.appendChild(style);
}
function appendEditScrobbleMenuItems(element) {
if (!document.URL.startsWith(libraryURL)) {
return; // current page is not the user's library
}
const tables = element.querySelectorAll('table.chartlist');
for (const table of tables) {
for (const row of table.tBodies[0].rows) {
appendEditScrobbleMenuItem(row);
}
}
}
function appendEditScrobbleMenuItem(row) {
const link = row.querySelector('a.chartlist-count-bar-link');
if (!link) {
return; // this is not an artist, album or track
}
const linkUrlType = getUrlType(link.href);
// re-use template from outer scope
const editScrobbleMenuItem = editScrobbleMenuItemTemplate.content.cloneNode(true);
const form = editScrobbleMenuItem.querySelector('form');
const button = form.querySelector('button[type="button"]');
const submitButton = form.querySelector('button[type="submit"]');
let allScrobbleData;
let scrobbleData;
button.addEventListener('click', async () => {
if (!allScrobbleData) {
const loadingModal = createLoadingModal('Loading Scrobbles...', { display: 'percentage' });
allScrobbleData = await fetchScrobbleData(link.href, loadingModal);
loadingModal.hide();
}
scrobbleData = allScrobbleData;
// use JSON strings as album keys to uniquely identify combinations of album + album artists
// group scrobbles by album key
let scrobbleDataGroups = [...groupBy(allScrobbleData, s => JSON.stringify({
album_name: s.get('album_name') || '',
album_artist_name: s.get('album_artist_name') || ''
}))];
// sort groups by the amount of scrobbles
scrobbleDataGroups = scrobbleDataGroups.sort(([_key1, values1], [_key2, values2]) => values2.length - values1.length);
// when editing multiple albums album, show an album selection dialog first
if (scrobbleDataGroups.length >= 2) {
let defaultSelection = 'all';
// when the edit dialog was initiated from an album or album track, put that album first in the list
if (linkUrlType === 'album' || getUrlType(document.URL) === 'album') {
// grab the current album name and artist name from the DOM
const album_name = (linkUrlType === 'album'
? row.querySelector('.chartlist-name')
: document.querySelector('.library-header-title')).textContent.trim();
const album_artist_name = (linkUrlType === 'album'
? document.querySelector('.library-header-title, .library-header-crumb')
: document.querySelector('.text-colour-link')).textContent.trim();
const currentAlbumKey = JSON.stringify({ album_name, album_artist_name });
// put the current album first
scrobbleDataGroups = scrobbleDataGroups.sort(([key1], [key2]) => {
if (key1 === currentAlbumKey) return -1;
if (key2 === currentAlbumKey) return +1;
return 0;
});
defaultSelection = 'first';
}
const disclaimer = `
<div class="alert alert-info">
Scrobbles from this ${linkUrlType} are spread out across multiple albums.
Select which albums you would like to edit.
Deselect albums you would like to skip.
</div>`;
const elements = scrobbleDataGroups.map(([key, scrobbleData], index) => {
const firstScrobbleData = scrobbleData[0];
const album_name = firstScrobbleData.get('album_name');
const artist_name = firstScrobbleData.get('album_artist_name') || firstScrobbleData.get('artist_name');
const selectFirst = index === 0 && defaultSelection === 'first';
return `
<div class="checkbox">
<label>
<input type="checkbox" name="key" value="${he.escape(key)}" ${selectFirst || defaultSelection === 'all' ? 'checked' : ''} />
<strong title="${he.escape(album_name || '')}" class="${namespace}-ellipsis ${selectFirst ? `${namespace}-text-info` : ''}">
${album_name ? he.escape(album_name) : '<em>No Album</em>'}
</strong>
<div title="${he.escape(artist_name)}" class="${namespace}-ellipsis">
${he.escape(artist_name)}
</div>
<small>
${scrobbleData.length} scrobble${scrobbleData.length !== 1 ? 's' : ''}
</small>
</label>
</div>`;
});
let formData;
try {
formData = await prompt('Select Albums To Edit', disclaimer, elements);
} catch (error) {
console.log(error);
return; // user canceled the album selection dialog
}
const selectedAlbumKeys = formData.getAll('key');
scrobbleData = flatten(scrobbleDataGroups
.filter(([key]) => selectedAlbumKeys.includes(key))
.map(([_, values]) => values));
}
if (scrobbleData.length === 0) {
alert(`Last.fm reports you haven't listened to this ${linkUrlType}.`);
return;
}
// use the first scrobble to trick Last.fm into fetching the Edit Scrobble modal
applyFormData(form, scrobbleData[0]);
submitButton.click();
});
submitButton.addEventListener('click', async () => {
const loadingModal = createLoadingModal('Waiting for Last.fm...');
await augmentEditScrobbleForm(linkUrlType, scrobbleData);
loadingModal.hide();
});
// append new menu item to the DOM
const menu = row.querySelector('.chartlist-more-menu');
menu.insertBefore(editScrobbleMenuItem, menu.firstElementChild);
}
// shows a form dialog and resolves it's promise on submit
function prompt(title, disclaimer, elements) {
return new Promise((resolve, reject) => {
const form = document.createElement('form');
form.className = 'form-horizontal';
const element = form.appendChild(document.createElement('div'));
element.className = 'form-disclaimer';
if (disclaimer instanceof Node) {
element.appendChild(disclaimer);
} else {
element.innerHTML += disclaimer;
}
const list = form.appendChild(document.createElement('ul'));
list.className = `${namespace}-list`;
for (const element of elements) {
const listItem = list.appendChild(document.createElement('li'));
if (element instanceof Node) {
listItem.appendChild(element);
} else {
listItem.innerHTML += element;
}
}
form.innerHTML += `
<div class="form-group form-group--submit">
<div class="form-submit">
<button type="reset" class="btn-secondary">Cancel</button>
<button type="submit" class="btn-primary">
<span class="btn-inner">
OK
</span>
</button>
</div>
</div>`;
const content = document.createElement('div');
content.className = 'content-form';
content.appendChild(form);
const modal = createModal(title, content, {
dismissible: true,
events: {
hide: reject
}
});
form.addEventListener('reset', modal.hide);
form.addEventListener('submit', (event) => {
event.preventDefault();
resolve(new FormData(form));
modal.hide();
});
modal.show();
});
}
function createModal(title, body, options) {
// re-use template from outer scope
const fragment = modalTemplate.content.cloneNode(true);
const modalTitle = fragment.querySelector('.modal-title');
if (title instanceof Node) {
modalTitle.appendChild(title);
} else {
modalTitle.innerHTML = title;
}
const modalBody = fragment.querySelector('.modal-body');
if (body instanceof Node) {
modalBody.appendChild(body);
} else {
modalBody.innerHTML = body;
}
const element = document.createElement('div');
if (options && options.dismissible) {
// create X button that closes the modal
const closeButton = document.createElement('button');
closeButton.className = 'modal-dismiss';
closeButton.textContent = 'Close';
closeButton.addEventListener('click', hide);
// append X button to DOM
const modalContent = fragment.querySelector('.modal-content');
modalContent.insertBefore(closeButton, modalContent.firstElementChild);
// close modal when user clicks outside modal
const popupWrapper = fragment.querySelector('.popup_wrapper');
popupWrapper.addEventListener('click', event => {
if (!modalContent.contains(event.target)) {
hide();
}
});
}
element.appendChild(fragment);
let addedClass = false;
function show() {
if (element.parentNode) return;
document.body.appendChild(element);
if (!document.documentElement.classList.contains('popup_visible')) {
document.documentElement.classList.add('popup_visible');
addedClass = true;
}
}
function hide() {
if (!element.parentNode) return;
element.parentNode.removeChild(element);
if (addedClass) {
document.documentElement.classList.remove('popup_visible');
addedClass = false;
}
if (options && options.events && options.events.hide) {
options.events.hide();
}
}
return { element, show, hide };
}
function createLoadingModal(title, options) {
const body = `
<div class="${namespace}-loading">
<div class="${namespace}-progress"></div>
</div>`;
const modal = createModal(title, body);
const progress = modal.element.querySelector(`.${namespace}-progress`);
// extend modal with custom properties
modal.steps = [];
modal.refreshProgress = () => {
switch (options && options.display) {
case 'count':
progress.textContent = `${modal.steps.filter(s => s.completed).length} / ${modal.steps.length}`;
break;
case 'percentage':
const completionRatio = getCompletionRatio(modal.steps);
progress.textContent = Math.floor(completionRatio * 100) + '%';
break;
}
};
modal.refreshProgress();
modal.show();
return modal;
}
// calculates the completion ratio from a tree of steps with weights and child steps
function getCompletionRatio(steps) {
const totalWeight = steps.map(s => s.weight).reduce((a, b) => a + b, 0);
if (totalWeight === 0) return 0;
const completedWeight = steps.map(s => s.weight * (s.completed ? 1 : getCompletionRatio(s.steps))).reduce((a, b) => a + b, 0);
return completedWeight / totalWeight;
}
// this is a recursive function that browses pages of artists, albums and tracks to gather scrobbles
async function fetchScrobbleData(url, loadingModal, parentStep) {
if (!parentStep) parentStep = loadingModal;
// remove "?date_preset=LAST_365_DAYS", etc.
const indexOfQuery = url.indexOf('?');
if (indexOfQuery !== -1) {
url = url.substr(0, indexOfQuery);
}
if (getUrlType(url) === 'artist') {
url += '/+tracks'; // skip artist overview and go straight to the tracks
}
const documentsToFetch = [fetchHTMLDocument(url)];
const firstDocument = await documentsToFetch[0];
const paginationList = firstDocument.querySelector('.pagination-list');
if (paginationList) {
const pageCount = parseInt(paginationList.children[paginationList.children.length - 2].textContent.trim(), 10);
const pageNumbersToFetch = [...Array(pageCount - 1).keys()].map(i => i + 2);
documentsToFetch.push(...pageNumbersToFetch.map(n => fetchHTMLDocument(`${url}?page=${n}`)));
}
let scrobbleData = await forEachParallel(loadingModal, parentStep, documentsToFetch, async (documentToFetch, step) => {
const fetchedDocument = await documentToFetch;
const table = fetchedDocument.querySelector('table.chartlist');
if (!table) {
// sometimes a missing chartlist is expected, other times it indicates a failure
if (fetchedDocument.body.textContent.includes('There was a problem loading your')) {
abort();
}
return [];
}
const rows = [...table.tBodies[0].rows];
// to display accurate loading percentages, tracks with more scrobbles will have more weight
const weightFunc = row => {
const barValue = row.querySelector('.chartlist-count-bar-value');
if (barValue === null) return 1;
const scrobbleCount = parseInt(barValue.firstChild.textContent.trim().replace(/,/g, ''), 10);
return Math.ceil(scrobbleCount / 50); // 50 = items per page on Last.fm
};
return await forEachParallel(loadingModal, step, rows, async (row, step) => {
const link = row.querySelector('.chartlist-count-bar-link');
if (link) {
// recursive call to the current function
return await fetchScrobbleData(link.href, loadingModal, step);
}
// no link indicates we're at the scrobble overview
const form = row.querySelector('form[data-edit-scrobble]');
return new FormData(form);
}, weightFunc);
});
return scrobbleData;
}
function getUrlType(url) {
// regular expressions are re-used from the outer scope
if (albumRegExp.test(url)) {
return 'album';
} else if (artistRegExp.test(url)) {
return 'artist';
} else {
return 'track';
}
}
async function fetchHTMLDocument(url) {
// retry 5 times with exponential timeout
for (let i = 0; i < 5; i++) {
if (i !== 0) {
// wait 2 seconds, then 4 seconds, then 8, finally 16 (30 seconds total)
await new Promise(resolve => setTimeout(resolve, Math.pow(2, i)));
}
const response = await fetch(url);
if (response.ok) {
const html = await response.text();
const doc = domParser.parseFromString(html, 'text/html');
if (doc.querySelector('table.chartlist') || i === 4) {
return doc;
}
}
}
abort();
}
let aborting = false;
function abort() {
if (aborting) return;
aborting = true;
alert('There was a problem loading your scrobbles, please try again later.');
window.location.reload();
}
// series for loop that updates the loading percentage
async function forEach(loadingModal, parentStep, array, callback, weightFunc) {
const tuples = array.map(item => ({ item, step: { weight: weightFunc ? weightFunc(item) : 1, steps: [] } }));
parentStep.steps.push(...tuples.map(tuple => tuple.step));
loadingModal.refreshProgress();
const result = [];
for (const tuple of tuples) {
result.push(await callback(tuple.item, tuple.step));
tuple.step.completed = true;
loadingModal.refreshProgress();
}
return flatten(result);
}
// parallel for loop that updates the loading percentage
async function forEachParallel(loadingModal, parentStep, array, callback, weightFunc) {
const tuples = array.map(item => ({ item, step: { weight: weightFunc ? weightFunc(item) : 1, steps: [] } }));
parentStep.steps.push(...tuples.map(tuple => tuple.step));
loadingModal.refreshProgress();
const result = await Promise.all(tuples.map(async tuple => {
const result = await callback(tuple.item, tuple.step);
tuple.step.completed = true;
loadingModal.refreshProgress();
return result;
}));
return flatten(result);
}
// because Edge does not support Array.prototype.flat()
function flatten(array) {
return array.reduce((flat, toFlatten) => {
return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
}, []);
}
function applyFormData(form, formData) {
for (const [name, value] of formData) {
const input = form.elements[name];
input.value = value;
}
}
// augments the default Edit Scrobble form to include new features
async function augmentEditScrobbleForm(urlType, scrobbleData) {
const wrapper = await observeChildList(document.body, '.popup_wrapper');
const popup = wrapper.querySelector('.popup_content');
const title = popup.querySelector('.modal-title');
const form = popup.querySelector('form[action$="/library/edit?edited-variation=library-track-scrobble"]');
title.textContent = `Edit ${urlType[0].toUpperCase() + urlType.slice(1)} Scrobbles`;
// remove traces of the first scrobble that was used to initialize the form
form.removeChild(form.querySelector('.form-group--timestamp'));
form.removeChild(form.elements['track_name_original']);
form.removeChild(form.elements['artist_name_original']);
form.removeChild(form.elements['album_name_original']);
form.removeChild(form.elements['album_artist_name_original']);
const track_name_input = form.elements['track_name'];
const artist_name_input = form.elements['artist_name'];
const album_name_input = form.elements['album_name'];
const album_artist_name_input = form.elements['album_artist_name'];
augmentInput(urlType, scrobbleData, popup, track_name_input, 'tracks');
augmentInput(urlType, scrobbleData, popup, artist_name_input, 'artists');
augmentInput(urlType, scrobbleData, popup, album_name_input, 'albums');
augmentInput(urlType, scrobbleData, popup, album_artist_name_input, 'album artists');
// keep album artist name in sync
let previousValue = artist_name_input.value;
artist_name_input.addEventListener('input', () => {
if (album_artist_name_input.value === previousValue) {
album_artist_name_input.value = artist_name_input.value;
album_artist_name_input.dispatchEvent(new Event('input'));
}
previousValue = artist_name_input.value;
});
if (album_artist_name_input.placeholder === 'Mixed') {
const template = document.createElement('template');
template.innerHTML = `
<div class="form-group-success">
<div class="alert alert-info">
<p>Matching album artists will be kept in sync.</p>
</div>
</div>`;
artist_name_input.parentNode.insertBefore(template.content, artist_name_input.nextElementChild);
}
// replace the "Edit all" checkbox with one that cannot be disabled
let editAllFormGroup = form.querySelector('.form-group--edit_all');
if (editAllFormGroup) form.removeChild(editAllFormGroup);
const summary = `${urlType !== 'artist' ? 'artist, ' : ''}${urlType !== 'track' ? 'track, ' : ''}${urlType !== 'album' ? 'album, ' : ''}and album artist`;
const editAllFormGroupTemplate = document.createElement('template');
editAllFormGroupTemplate.innerHTML = `
<div class="form-group form-group--edit_all js-form-group">
<label for="id_edit_all" class="control-label">Bulk edit</label>
<div class="js-form-group-controls form-group-controls">
<div class="checkbox">
<label for="id_edit_all">
<input id="id_edit_all" type="checkbox" checked disabled>
<input name="edit_all" type="hidden" value="true">
Edit all
<span class="abbr" title="You have scrobbled any combination of ${summary} ${scrobbleData.length} times">
${scrobbleData.length} scrobbles
</span>
of this ${urlType}
</label>
</div>
</div>
</div>`;
editAllFormGroup = editAllFormGroupTemplate.content.cloneNode(true);
form.insertBefore(editAllFormGroup, form.lastElementChild);
// each exact track, artist, album and album artist combination is considered a distinct scrobble
const distinctGroups = groupBy(scrobbleData, s => JSON.stringify({
track_name: s.get('track_name'),
artist_name: s.get('artist_name'),
album_name: s.get('album_name') || '',
album_artist_name: s.get('album_artist_name') || ''
}));
const distinctScrobbleData = [...distinctGroups].map(([name, values]) => values[0]);
const submitButton = form.querySelector('button[type="submit"]');
submitButton.addEventListener('click', async event => {
event.preventDefault();
for (const element of form.elements) {
if (element.dataset.confirm && element.placeholder !== 'Mixed') {
if (confirm(element.dataset.confirm)) {
delete element.dataset.confirm; // don't confirm again when resubmitting
} else {
return; // stop submit
}
}
}
const formData = new FormData(form);
const formDataToSubmit = [];
const track_name = getMixedInputValue(track_name_input);
const artist_name = getMixedInputValue(artist_name_input);
const album_name = getMixedInputValue(album_name_input);
const album_artist_name = getMixedInputValue(album_artist_name_input);
for (const originalData of distinctScrobbleData) {
const track_name_original = originalData.get('track_name');
const artist_name_original = originalData.get('artist_name');
const album_name_original = originalData.get('album_name') || '';
const album_artist_name_original = originalData.get('album_artist_name') || '';
// if the album artist field is Mixed, use the old and new artist names to keep the album artist in sync
const album_artist_name_sync = album_artist_name_input.placeholder === 'Mixed' && distinctScrobbleData.some(s => s.get('artist_name') === album_artist_name_original)
? artist_name
: album_artist_name;
// check if anything changed compared to the original track, artist, album and album artist combination
if (track_name !== null && track_name !== track_name_original ||
artist_name !== null && artist_name !== artist_name_original ||
album_name !== null && album_name !== album_name_original ||
album_artist_name_sync !== null && album_artist_name_sync !== album_artist_name_original) {
const clonedFormData = cloneFormData(formData);
// Last.fm expects a timestamp
clonedFormData.set('timestamp', originalData.get('timestamp'));
// populate the *_original fields to instruct Last.fm which scrobbles need to be edited
clonedFormData.set('track_name_original', track_name_original);
if (track_name === null) {
clonedFormData.set('track_name', track_name_original);
}
clonedFormData.set('artist_name_original', artist_name_original);
if (artist_name === null) {
clonedFormData.set('artist_name', artist_name_original);
}
clonedFormData.set('album_name_original', album_name_original);
if (album_name === null) {
clonedFormData.set('album_name', album_name_original);
}
clonedFormData.set('album_artist_name_original', album_artist_name_original);
if (album_artist_name_sync === null) {
clonedFormData.set('album_artist_name', album_artist_name_original);
} else {
clonedFormData.set('album_artist_name', album_artist_name_sync);
}
formDataToSubmit.push(clonedFormData);
}
}
if (formDataToSubmit.length === 0) {
alert('Your edit doesn\'t contain any real changes.'); // TODO: pretty validation messages
return;
}
// hide the Edit Scrobble form
const cancelButton = form.querySelector('button.js-close');
cancelButton.click();
const loadingModal = createLoadingModal('Saving Edits...', { display: 'count' });
const parentStep = loadingModal;
// run edits in series, inconsistencies will arise if you use a parallel loop
await forEach(loadingModal, parentStep, formDataToSubmit, async formData => {
// Edge does not support passing formData into URLSearchParams() constructor
const body = new URLSearchParams();
for (const [name, value] of formData) {
body.append(name, value);
}
const response = await fetch(form.action, { method: 'POST', body: body });
const html = await response.text();
// use DOMParser to check the response for alerts
const placeholder = domParser.parseFromString(html, 'text/html');
for (const message of placeholder.querySelectorAll('.alert-danger')) {
alert(message.textContent.trim()); // TODO: pretty validation messages
}
});
// Last.fm sometimes displays old data when reloading too fast, so wait 1 second
setTimeout(() => { window.location.reload(); }, 1000);
});
}
// helper function that completes when a matching element gets appended
function observeChildList(target, selector) {
return new Promise(resolve => {
const observer = new MutationObserver(mutations => {
for (const mutation of mutations) {
for (const node of mutation.addedNodes) {
if (node.matches(selector)) {
observer.disconnect();
resolve(node);
return;
}
}
}
});
observer.observe(target, { childList: true });
});
}
// turns a normal input into an input that supports the "Mixed" state
function augmentInput(urlType, scrobbleData, popup, input, plural) {
const groups = [...groupBy(scrobbleData, s => s.get(input.name))].sort((a, b) => b[1].length - a[1].length);
if (groups.length >= 2) {
// display the "Mixed" placeholder when there are two or more possible values
input.value = '';
input.placeholder = 'Mixed';
const tab = '\xa0'.repeat(8); // 8 non-breaking spaces
const abbr = document.createElement('span');
abbr.className = `abbr ${namespace}-abbr`;
abbr.textContent = `${groups.length} ${plural}`;
abbr.title = groups.map(([key, values]) => `${values.length}x${tab}${key || ''}`).join('\n');
input.parentNode.insertBefore(abbr, input.nextElementChild);
input.dataset.confirm = `You are about to merge scrobbles for ${groups.length} ${plural}. This cannot be undone. Would you like to continue?`;
}
// datalist: a native HTML5 autocomplete feature
const datalist = document.createElement('datalist');
datalist.id = `${namespace}-${popup.id}-${input.name}-datalist`;
for (const [key] of groups) {
const option = document.createElement('option');
option.value = key || '';
datalist.appendChild(option);
}
input.autocomplete = 'off';
input.setAttribute('list', datalist.id);
input.parentNode.insertBefore(datalist, input.nextElementChild);
// display green color when field was edited, red if it's not allowed to be empty
const formGroup = input.closest('.form-group');
const defaultValue = input.value;
input.addEventListener('input', () => {
input.placeholder = ''; // removes "Mixed" state
refreshFormGroupState();
});
input.addEventListener('keydown', event => {
if (event.keyCode === 8 || event.keyCode === 46) { // backspace or delete
input.placeholder = ''; // removes "Mixed" state
refreshFormGroupState();
}
});
function refreshFormGroupState() {
formGroup.classList.remove('has-error');
formGroup.classList.remove('has-success');
if (input.value !== defaultValue || groups.length >= 2 && input.placeholder === '') {
if (input.value === '' && (input.name === 'track_name' || input.name === 'artist_name')) {
formGroup.classList.add('has-error');
} else {
formGroup.classList.add('has-success');
}
}
}
}
function groupBy(array, keyFunc) {
const map = new Map();
for (const item of array) {
const key = keyFunc(item);
const value = map.get(key);
if (!value) {
map.set(key, [item]);
} else {
value.push(item);
}
}
return map;
}
function getMixedInputValue(input) {
return input.placeholder !== 'Mixed' ? input.value : null;
}
function cloneFormData(formData) {
const clonedFormData = new FormData();
for (const [name, value] of formData) {
clonedFormData.append(name, value);
}
return clonedFormData;
}