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Wait For Selector

Waits for selectors to match newly added nodes

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greatest.deepsurf.us/scripts/432418/1192077/Wait%20For%20Selector.js 

  1. // ==UserScript==
  2. // @name         Wait For Selector
  3. // @namespace    http://tampermonkey.net/
  4. // @description  Waits for elements
  5. // @author       Kumirei
  6. // @include      *community.wanikani.com*
  7. // @grant        none
  8. // ==/UserScript==
  9.  
  10. ;(function (wfs) {
  11.     let version = '1.0.1'
  12.  
  13.     // Create new observer on body to monitor all DOM changes
  14.     let observer = new MutationObserver(mutationHandler)
  15.     observer.observe(document.getElementsByTagName('html')[0], { childList: true, subtree: true })
  16.  
  17.     // Interface for interacting with the library
  18.     let interface = {
  19.         version,
  20.         observer: observer,
  21.         wait: waitForSelector,
  22.         unwait: unwaitID,
  23.         waits: {},
  24.         waitsByID: {},
  25.         nextID: 0,
  26.     }
  27.  
  28.     // Start
  29.     installInterface()
  30.  
  31.     // Creates a new entry to search for whenever a new element is added to the DOM
  32.     function waitForSelector(selector, callback) {
  33.         if (!interface.waits[selector]) interface.waits[selector] = {}
  34.         interface.waits[selector][interface.nextID] = callback
  35.         interface.waitsByID[interface.nextID] = selector
  36.         search(selector, true)
  37.         return interface.nextID++
  38.     }
  39.  
  40.     // Deletes a previously registered selector
  41.     function unwaitID(ID) {
  42.         delete interface.waits[interface.waitsByID[ID]][ID]
  43.         delete interface.waitsByID[ID]
  44.     }
  45.  
  46.     // Makes sure that the public interface is the newest version and the same as the local one
  47.     function installInterface() {
  48.         if (!wfs) window.wfs = interface
  49.         else if (wfs.version < interface.version) {
  50.             wfs.version = interface.version
  51.             wfs.observer.disconnect()
  52.             wfs.observer = interface.observer
  53.             wfs.wait = interface.wait
  54.             wfs.unwait = interface.unwait
  55.         }
  56.         interface = wfs || interface
  57.     }
  58.  
  59.     // Waits until there has been more than 300 ms between mutations and then checks for new elements
  60.     let lastMutationDate = 0 // Epoch of last mutation event
  61.     let timeoutID = 0
  62.     function mutationHandler(mutations) {
  63.         let duration = Date.now() - lastMutationDate
  64.         lastMutationDate = Date.now()
  65.         if (duration < 300) {
  66.             clearTimeout(timeoutID)
  67.             timeoutID = setTimeout(() => {
  68.                 for (let selector in interface.waits) search(selector)
  69.             }, 300)
  70.         }
  71.     }
  72.  
  73.     // Searches for the selector and calls the callback on the found elements
  74.     function search(selector, all = false) {
  75.         document.querySelectorAll(selector).forEach((e, i) => {
  76.             let callbacks = Object.values(interface.waits[selector])
  77.             if (all || !e.WFSFound || e.WFSFound == lastMutationDate) {
  78.                 for (let callback of callbacks) callback(e)
  79.                 e.WFSFound = lastMutationDate
  80.             }
  81.         })
  82.     }
  83. })(window.wfs)