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Library | querySelectorInterval

Use document.querySelector() to continuously look for an Element. Call a function when found. Powered by requestAnimationFrame.

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.gf.qytechs.cn/scripts/375023/1060699/Library%20%7C%20querySelectorInterval.js 

  1. // ==UserScript==
  2. // @name            Library: querySelectorInterval
  3. // @namespace       org.sidneys.userscripts
  4. // @homepage        https://gist.githubusercontent.com/sidneys/c6b91437cb89346281bb2f739c1d6ae2/raw/
  5. // @version         0.7.4
  6. // @description     Use document.querySelector() to continuously look for an Element. Call a function when found. Powered by requestAnimationFrame.
  7. // @author          sidneys
  8. // @icon            https://i.imgur.com/nmbtzlX.png
  9. // @match           *://*/*
  10. // ==/UserScript==
  11.  
  12.  
  13. /**
  14.  * ESLint
  15.  * @exports
  16.  */
  17. /* exported querySelectorInterval, clearQuerySelectorInterval */
  18.  
  19.  
  20. /**
  21.  * Unique identifier returned by querySelectorInterval().
  22.  * @typedef {Number} intervalHandle
  23.  */
  24.  
  25. /**
  26.  * This callback is displayed as a global member.
  27.  * @callback intervalCallback
  28.  * @param {Element} Element found by document.querySelector()
  29.  */
  30.  
  31. /**
  32.  * Repeatedly try to find (using a optional time delay) the first element
  33.  * that is a descendant of a base element, and matches the selectors.
  34.  * Call a callback with the found element as argument when successful.
  35.  * Returns an identifier for removal via clearQuerySelectorInterval().
  36.  * @param {Element} element - Base Element
  37.  * @param {String} selectors - DOMString containing one or more selectors to match against
  38.  * @param {intervalCallback=} callback - The callback that is called when an Element was found
  39.  * @param {Number=} delay - Duration (ms) the timer should wait between executions
  40.  * @return {intervalHandle} - Unique interval handle
  41.  * @global
  42.  */
  43. let querySelectorInterval = (element, selectors, callback = () => {}, delay = 0) => {
  44.     // console.debug('querySelectorInterval')
  45.  
  46.     // requestAnimationFrame identifier
  47.     let requestId
  48.  
  49.     // Initial timestamp
  50.     let lastTimestamp = new Date().getTime()
  51.  
  52.     // Lookup Logic
  53.     let lookup = () => {
  54.         // Get current timestamp
  55.         const currentTimestamp = new Date().getTime()
  56.  
  57.         // Get elapsed time (between timestamps)
  58.         const elapsedDuration = currentTimestamp - lastTimestamp
  59.  
  60.         // Elapsed time larger than delay?
  61.         if (elapsedDuration >= delay) {
  62.             // Test if selectors finds a descendant beneath element
  63.             const foundElement = element.querySelector(selectors)
  64.  
  65.             // Element found
  66.             if (foundElement) {
  67.                 callback(foundElement)
  68.             }
  69.  
  70.             // Update last timestamp
  71.             lastTimestamp = new Date().getTime()
  72.         }
  73.  
  74.         // Rerun Lookup
  75.         requestId = window.requestAnimationFrame(lookup)
  76.     }
  77.  
  78.     // Initial lookup
  79.     requestId = window.requestAnimationFrame(lookup)
  80.  
  81.     return requestId
  82. }
  83.  
  84. /**
  85.  * Cancels intervals scheduled via querySelectorInterval().
  86.  * @param {intervalHandle} handle - Unique interval handle
  87.  * @global
  88.  */
  89. let clearQuerySelectorInterval = (handle) => {
  90.     // console.debug('clearQuerySelectorInterval')
  91.  
  92.     // Cancel interval
  93.     window.cancelAnimationFrame(handle)
  94. }

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