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tblistener.js.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>tblistener.js - Documentation</title>
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<h2><a href="index.html">Home</a></h2><h2><a href="https://github.com/toolbox-team/reddit-moderator-toolbox" target="_blank" class="menu-item" >Github</a></h2><h2><a href="https://www.reddit.com/r/toolbox" target="_blank" class="menu-item" >Subreddit</a></h2><h3>Classes</h3><ul><li><a href="Module.html">Module</a><ul class='methods'><li data-type='method'><a href="Module.html#get">get</a></li><li data-type='method'><a href="Module.html#getEnabled">getEnabled</a></li><li data-type='method'><a href="Module.html#init">init</a></li><li data-type='method'><a href="Module.html#set">set</a></li><li data-type='method'><a href="Module.html#setEnabled">setEnabled</a></li></ul></li><li><a href="TBListener.html">TBListener</a><ul class='methods'><li data-type='method'><a href="TBListener.html#clear">clear</a></li><li data-type='method'><a href="TBListener.html#on">on</a></li><li data-type='method'><a href="TBListener.html#start">start</a></li><li data-type='method'><a href="TBListener.html#stop">stop</a></li></ul></li></ul><h3>Global</h3><ul><li><a href="global.html#DISPLAY_BOTTOM">DISPLAY_BOTTOM</a></li><li><a href="global.html#DISPLAY_CENTER">DISPLAY_CENTER</a></li><li><a href="global.html#FEEDBACK_NEGATIVE">FEEDBACK_NEGATIVE</a></li><li><a href="global.html#FEEDBACK_NEUTRAL">FEEDBACK_NEUTRAL</a></li><li><a href="global.html#FEEDBACK_POSITIVE">FEEDBACK_POSITIVE</a></li><li><a href="global.html#ModNotesBadge">ModNotesBadge</a></li><li><a href="global.html#ModNotesPager">ModNotesPager</a></li><li><a href="global.html#ModNotesPopup">ModNotesPopup</a></li><li><a href="global.html#NoteTableRow">NoteTableRow</a></li><li><a href="global.html#RandomFeedback">RandomFeedback</a></li><li><a href="global.html#RandomQuote">RandomQuote</a></li><li><a href="global.html#TBsettingsObject">TBsettingsObject</a></li><li><a href="global.html#actionButton">actionButton</a></li><li><a href="global.html#addModSubsToSidebar">addModSubsToSidebar</a></li><li><a href="global.html#addToSiteTable">addToSiteTable</a></li><li><a href="global.html#addTrophiesToSidebar">addTrophiesToSidebar</a></li><li><a href="global.html#alert">alert</a></li><li><a href="global.html#baseDomain">baseDomain</a></li><li><a href="global.html#browserName">browserName</a></li><li><a href="global.html#buildSha">buildSha</a></li><li><a href="global.html#buildType">buildType</a></li><li><a href="global.html#button">button</a></li><li><a href="global.html#checkForActions">checkForActions</a></li><li><a href="global.html#cleanSubredditName">cleanSubredditName</a></li><li><a href="global.html#clearCache">clearCache</a></li><li><a href="global.html#colorNameToHex">colorNameToHex</a></li><li><a href="global.html#contextTrigger">contextTrigger</a></li><li><a href="global.html#createDeferredProcessQueue">createDeferredProcessQueue</a></li><li><a href="global.html#daysToMilliseconds">daysToMilliseconds</a></li><li><a href="global.html#debounce">debounce</a></li><li><a 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href="global.html#getLastVersion">getLastVersion</a></li><li><a href="global.html#getLatestModNote">getLatestModNote</a></li><li><a href="global.html#getModSubs">getModSubs</a></li><li><a href="global.html#getModlog">getModlog</a></li><li><a href="global.html#getRandomNumber">getRandomNumber</a></li><li><a href="global.html#getSetting">getSetting</a></li><li><a href="global.html#getSettingAsync">getSettingAsync</a></li><li><a href="global.html#getSettings">getSettings</a></li><li><a href="global.html#getSubmissionFullname">getSubmissionFullname</a></li><li><a href="global.html#getSubredditColors">getSubredditColors</a></li><li><a href="global.html#getTime">getTime</a></li><li><a href="global.html#getToolboxDevs">getToolboxDevs</a></li><li><a href="global.html#handleMessage">handleMessage</a></li><li><a href="global.html#handleTBThings">handleTBThings</a></li><li><a href="global.html#handleThing">handleThing</a></li><li><a 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<h1 class="page-title">tblistener.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>import $ from 'jquery';
import TBLog from './tblog.ts';
const logger = TBLog('TBListener');
/**
* Event listener aliases. Allows you to listen for `author` and get `postAuthor` and `commentAuthor` events,
* for example.
* @type {Object.<string, Array<string>>}
*/
const listenerAliases = {
postAuthor: ['author'],
commentAuthor: ['author'],
TBcommentAuthor: ['author'],
TBpostAuthor: ['author'],
TBcomment: ['comment'],
TBcommentOldReddit: ['comment'],
TBpost: ['post'],
TBuserHovercard: ['userHovercard'],
TBmodmailCommentAuthor: ['author'],
};
/**
* We run this inside a try catch
* so that if any jobs error, we
* are able to recover and continue
* to flush the batch until it's empty.
*
* @private
*/
function runTasks (tasks) {
logger.debug('run tasks');
let task;
while ((task = tasks.shift())) {
task();
}
}
/**
* Remove an item from an Array.
*
* @param {Array} array
* @param {*} item
* @return {Boolean}
*/
function remove (array, item) {
const index = array.indexOf(item);
return !!~index && !!array.splice(index, 1);
}
class TBListener {
/**
* Create a new instance of TBListener. Nothing happens yet until TBListener.start() has been called
*/
constructor () {
// Simple array holding callbacks waiting to be handled.
// If you want to put something in here directly, make sure to call scheduleFlush()
this.queue = [];
// Holding areference to the bound function so `removeEventListener` can be called later
this.boundFunc = this.listener.bind(this);
// Object holding all registered listeners.
// Keys are listener names, with arrays of callbacks as their values
this.listeners = {};
// Used by stop() and start()
this.started = false;
// If you assign a function to this, every single `reddit` event will go to it
this.debugFunc = null;
this.scheduled = false;
}
/**
* Starts the TBListener instance by registering an event listener for `reddit` events
*
* A `TBListenerLoaded` event is fired when everything is ready.
*/
start () {
if (!this.started) {
const loadedEvent = new CustomEvent('TBListenerLoaded');
const meta = document.createElement('meta');
meta.name = 'jsapi.consumer';
meta.content = 'toolbox';
document.head.appendChild(meta);
const readyEvent = new CustomEvent('reddit.ready');
document.addEventListener('reddit', this.boundFunc, true);
document.addEventListener('tbReddit', this.boundFunc, true);
document.dispatchEvent(loadedEvent);
meta.dispatchEvent(readyEvent);
this.started = true;
}
}
/**
* Unregisters this instance's event listener
*/
stop () {
if (this.started) {
document.removeEventListener('reddit', this.boundFunc);
document.removeEventListener('tbReddit', this.boundFunc);
this.started = false;
}
}
/**
* Register an event listener for a given event name for a callback.
*
* @param {string} Name of event
* @param {TBListener~listenerCallback} Callback
*/
on (event, callback) {
if (!this.listeners[event]) {
this.listeners[event] = [];
}
this.listeners[event].push(callback);
}
/**
* Callback for a `reddit` event.
* The callback's `this` is event.target
*
* @callback TBListener~listenerCallback
* @param {CustomEvent} event
* @param {string} responseMessage
* @this HTMLElement
*/
/**
* The function that gets registered as a global event listener for `reddit` events.
*
* @param {CustomEvent}
* @private
*/
listener (event) {
const eventType = event.detail.type;
const target = event.target.querySelector('[data-name="toolbox"]');
// If there is no target this is not for us.
if (!target) {
return;
}
// We already have seen this attribute and do not need duplicates.
if (target.classList.contains('tb-frontend-container')) {
return;
}
const $target = $(target);
$target.data('tb-details', event.detail);
$target.data('tb-type', event.detail.type);
target.setAttribute('data-tb-type', event.detail.type);
target.classList.add('tb-frontend-container');
const internalEvent = {
detail: event.detail,
target,
};
// See if there's any registered listeners listening for eventType
if (Array.isArray(this.listeners[eventType])) {
for (const listener of this.listeners[eventType]) {
this.queue.push(listener.bind(target, internalEvent));
}
}
// Check and see if there are any aliases for `eventType` and run those on the queue
if (Array.isArray(listenerAliases[eventType])) {
for (const alias of listenerAliases[eventType]) {
if (Array.isArray(this.listeners[alias])) {
for (const listener of this.listeners[alias]) {
this.queue.push(listener.bind(target, internalEvent));
}
}
}
}
// Run the debug function on the queue, if there's any
if (this.debugFunc) {
this.queue.push(this.debugFunc.bind(target, internalEvent));
}
// Flush the queue
this.scheduleFlush();
}
/**
* Clears a scheduled 'read' or 'write' task.
*
* @param {Object} task
* @return {Boolean} success
* @public
*/
clear (task) {
return remove(this.queue, task);
}
/**
* Schedules a new read/write
* batch if one isn't pending.
*
* @private
*/
scheduleFlush () {
if (!this.scheduled) {
this.scheduled = true;
requestAnimationFrame(this.flush.bind(this));
}
}
/**
* Runs queued tasks.
*
* Errors are caught and thrown by default.
* If a `.catch` function has been defined
* it is called instead.
*
* @private
*/
flush () {
const queue = this.queue;
let error;
try {
runTasks(queue);
} catch (e) {
error = e;
}
this.scheduled = false;
// If the batch errored we may still have tasks queued
if (queue.length) {
this.scheduleFlush();
}
if (error) {
logger.error('task errored', error.message);
if (this.catch) {
this.catch(error);
} else {
throw error;
}
}
}
}
export default new TBListener();
</code></pre>
</article>
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