moviewyrm/bookwyrm/static/js/bookwyrm.js

286 lines
7.8 KiB
JavaScript
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/* exported BookWyrm */
/* globals TabGroup */
let BookWyrm = new class {
constructor() {
this.initOnDOMLoaded();
this.initReccuringTasks();
this.initEventListeners();
}
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initEventListeners() {
document.querySelectorAll('[data-controls]')
.forEach(button => button.addEventListener(
'click',
this.toggleAction.bind(this))
);
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document.querySelectorAll('.interaction')
.forEach(button => button.addEventListener(
'submit',
this.interact.bind(this))
);
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document.querySelectorAll('.hidden-form input')
.forEach(button => button.addEventListener(
'change',
this.revealForm.bind(this))
);
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document.querySelectorAll('[data-back]')
.forEach(button => button.addEventListener(
'click',
this.back)
);
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}
/**
* Execute code once the DOM is loaded.
*/
initOnDOMLoaded() {
window.addEventListener('DOMContentLoaded', function() {
document.querySelectorAll('.tab-group')
.forEach(tabs => new TabGroup(tabs));
});
}
/**
* Execute recurring tasks.
*/
initReccuringTasks() {
// Polling
document.querySelectorAll('[data-poll]')
.forEach(liveArea => this.polling(liveArea));
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}
/**
* Go back in browser history.
*
* @param {Event} event
* @return {undefined}
*/
back(event) {
event.preventDefault();
history.back();
}
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/**
* Update a counter with recurring requests to the API
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* The delay is slightly randomized and increased on each cycle.
*
* @param {Object} counter - DOM node
* @param {int} delay - frequency for polling in ms
* @return {undefined}
*/
polling(counter, delay) {
const bookwyrm = this;
delay = delay || 10000;
delay += (Math.random() * 1000);
setTimeout(function() {
fetch('/api/updates/' + counter.dataset.poll)
.then(response => response.json())
.then(data => bookwyrm.updateCountElement(counter, data));
bookwyrm.polling(counter, delay * 1.25);
}, delay, counter);
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}
/**
* Update a counter.
*
* @param {object} counter - DOM node
* @param {object} data - json formatted response from a fetch
* @return {undefined}
*/
updateCountElement(counter, data) {
const currentCount = counter.innerText;
const count = data.count;
if (count != currentCount) {
this.addRemoveClass(counter.closest('[data-poll-wrapper]'), 'is-hidden', count < 1);
counter.innerText = count;
}
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}
/**
* Toggle form.
*
* @param {Event} event
* @return {undefined}
*/
revealForm(event) {
let trigger = event.currentTarget;
let hidden = trigger.closest('.hidden-form').querySelectorAll('.is-hidden')[0];
this.addRemoveClass(hidden, 'is-hidden', !hidden);
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}
/**
* Execute actions on targets based on triggers.
*
* @param {Event} event
* @return {undefined}
*/
toggleAction(event) {
let trigger = event.currentTarget;
let pressed = trigger.getAttribute('aria-pressed') === 'false';
let targetId = trigger.dataset.controls;
// Toggle pressed status on all triggers controlling the same target.
document.querySelectorAll('[data-controls="' + targetId + '"]')
.forEach(otherTrigger => otherTrigger.setAttribute(
'aria-pressed',
otherTrigger.getAttribute('aria-pressed') === 'false'
));
// @todo Find a better way to handle the exception.
if (targetId && ! trigger.classList.contains('pulldown-menu')) {
let target = document.getElementById(targetId);
this.addRemoveClass(target, 'is-hidden', !pressed);
this.addRemoveClass(target, 'is-active', pressed);
}
// Show/hide pulldown-menus.
if (trigger.classList.contains('pulldown-menu')) {
this.toggleMenu(trigger, targetId);
}
// Show/hide container.
let container = document.getElementById('hide-' + targetId);
if (container) {
this.toggleContainer(container, pressed);
}
// Check checkbox, if appropriate.
let checkbox = trigger.dataset.controlsCheckbox;
if (checkbox) {
this.toggleCheckbox(checkbox, pressed);
}
// Set focus, if appropriate.
let focus = trigger.dataset.focusTarget;
if (focus) {
this.toggleFocus(focus);
}
}
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/**
* Show or hide menus.
*
* @param {Event} event
* @return {undefined}
*/
toggleMenu(trigger, targetId) {
let expanded = trigger.getAttribute('aria-expanded') == 'false';
trigger.setAttribute('aria-expanded', expanded);
if (targetId) {
let target = document.getElementById(targetId);
this.addRemoveClass(target, 'is-active', expanded);
}
}
/**
* Show or hide generic containers.
*
* @param {object} container - DOM node
* @param {boolean} pressed - Is the trigger pressed?
* @return {undefined}
*/
toggleContainer(container, pressed) {
this.addRemoveClass(container, 'is-hidden', pressed);
}
/**
* Check or uncheck a checbox.
*
* @param {object} checkbox - DOM node
* @param {boolean} pressed - Is the trigger pressed?
* @return {undefined}
*/
toggleCheckbox(checkbox, pressed) {
document.getElementById(checkbox).checked = !!pressed;
}
/**
* Give the focus to an element.
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* Only move the focus based on user interactions.
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*
* @param {string} nodeId - ID of the DOM node to focus (button, link)
* @return {undefined}
*/
toggleFocus(nodeId) {
let node = document.getElementById(nodeId);
node.focus();
setTimeout(function() {
node.selectionStart = node.selectionEnd = 10000;
}, 0);
}
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/**
* Make a request and update the UI accordingly.
* This function is used for boosts, favourites, follows and unfollows.
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*
* @param {Event} event
* @return {undefined}
*/
interact(event) {
event.preventDefault();
const bookwyrm = this;
const form = event.currentTarget;
const relatedforms = document.querySelectorAll(`.${form.dataset.id}`);
// Toggle class on all related forms.
relatedforms.forEach(relatedForm => bookwyrm.addRemoveClass(
relatedForm,
'is-hidden',
relatedForm.className.indexOf('is-hidden') == -1
));
this.ajaxPost(form).catch(error => {
// @todo Display a notification in the UI instead.
console.warn('Request failed:', error);
});
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}
/**
* Submit a form using POST.
*
* @param {object} form - Form to be submitted
* @return {Promise}
*/
ajaxPost(form) {
return fetch(form.action, {
method : "POST",
body: new FormData(form)
});
}
/**
* Add or remove a class based on a boolean condition.
*
* @param {object} node - DOM node to change class on
* @param {string} classname - Name of the class
* @param {boolean} add - Add?
* @return {undefined}
*/
addRemoveClass(node, classname, add) {
if (add) {
node.classList.add(classname);
} else {
node.classList.remove(classname);
}
}
}