Waits for selectors to match newly added nodes
Este script não deve ser instalado diretamente. É uma biblioteca destinada a ser incluída por outros scripts através da diretiva de metadados // @require https://update.greasyfork.org/scripts/432418/1192077/Wait%20For%20Selector.js
// ==UserScript==
// @name Wait For Selector
// @namespace http://tampermonkey.net/
// @description Waits for elements
// @author Kumirei
// @include *community.wanikani.com*
// @grant none
// ==/UserScript==
;(function (wfs) {
let version = '1.0.1'
// Create new observer on body to monitor all DOM changes
let observer = new MutationObserver(mutationHandler)
observer.observe(document.getElementsByTagName('html')[0], { childList: true, subtree: true })
// Interface for interacting with the library
let interface = {
version,
observer: observer,
wait: waitForSelector,
unwait: unwaitID,
waits: {},
waitsByID: {},
nextID: 0,
}
// Start
installInterface()
// Creates a new entry to search for whenever a new element is added to the DOM
function waitForSelector(selector, callback) {
if (!interface.waits[selector]) interface.waits[selector] = {}
interface.waits[selector][interface.nextID] = callback
interface.waitsByID[interface.nextID] = selector
search(selector, true)
return interface.nextID++
}
// Deletes a previously registered selector
function unwaitID(ID) {
delete interface.waits[interface.waitsByID[ID]][ID]
delete interface.waitsByID[ID]
}
// Makes sure that the public interface is the newest version and the same as the local one
function installInterface() {
if (!wfs) window.wfs = interface
else if (wfs.version < interface.version) {
wfs.version = interface.version
wfs.observer.disconnect()
wfs.observer = interface.observer
wfs.wait = interface.wait
wfs.unwait = interface.unwait
}
interface = wfs || interface
}
// Waits until there has been more than 300 ms between mutations and then checks for new elements
let lastMutationDate = 0 // Epoch of last mutation event
let timeoutID = 0
function mutationHandler(mutations) {
let duration = Date.now() - lastMutationDate
lastMutationDate = Date.now()
if (duration < 300) {
clearTimeout(timeoutID)
timeoutID = setTimeout(() => {
for (let selector in interface.waits) search(selector)
}, 300)
}
}
// Searches for the selector and calls the callback on the found elements
function search(selector, all = false) {
document.querySelectorAll(selector).forEach((e, i) => {
let callbacks = Object.values(interface.waits[selector])
if (all || !e.WFSFound || e.WFSFound == lastMutationDate) {
for (let callback of callbacks) callback(e)
e.WFSFound = lastMutationDate
}
})
}
})(window.wfs)