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Wait for key element

A utility function, for Greasemonkey scripts, that detects and handles dynamic content.

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/482702/1299083/Wait%20for%20key%20element.js 

  1. // ==UserScript==
  2. // @name          Wait for key elements
  3. // @namespace     http://tampermonkey.net/
  4. // @version       0.1
  5. // @description   A utility function, for Greasemonkey scripts, that detects and handles dynamic content.
  6. // @author        https://github.com/cgriebel
  7. // @grant         none
  8. // @include       *
  9. // ==/UserScript==
  10.  
  11. /*--- waitForKeyElements():  
  12.     Usage example:
  13.  
  14.         waitForKeyElements ("div.comments", commentCallbackFunction);
  15.  
  16.         //--- Page-specific function to do what we want when the node is found.
  17.         function commentCallbackFunction (jNode) {
  18.             jNode.text ("This comment changed by waitForKeyElements().");
  19.         }
  20. */
  21. function waitForKeyElements(
  22.   selectorTxt,    /* Required: The selector string that specifies the desired element(s). */
  23.   actionFunction, /* Required: The code to run when elements are found. It is passed a jNode to the matched element. */
  24.   waitOnce,      /* Optional: If false, will continue to scan for new elements even after the first match is found. */
  25.   iframeSelector  /* Optional: If set, identifies the iframe to search. */
  26. ) {
  27.   const dataAttr = 'data-wait-for-elements-found';
  28.   var targetNodes, targetsFound;
  29.  
  30.   if (typeof iframeSelector == "undefined") {
  31.     var nodes = document.querySelectorAll(selectorTxt);
  32.     targetNodes = nodes ? [...nodes] : null;
  33.   }
  34.   else {
  35.     // TODO: CG - test iframes, I currently have no use for this
  36.     // targetNodes = $(iframeSelector).contents()
  37.     //   .find(selectorTxt);
  38.   }
  39.  
  40.   if (targetNodes && targetNodes.length > 0) {
  41.     targetsFound = true;
  42.     /*--- Found target node(s).  Go through each and act if they
  43.         are new.
  44.     */
  45.     targetNodes.forEach((node) => {
  46.       if (!node.getAttribute(dataAttr)) {
  47.         //--- Call the payload function.
  48.         var cancelFound = actionFunction(node);
  49.         if (cancelFound) {
  50.           targetsFound = false;
  51.         }
  52.         else {
  53.           node.setAttribute(dataAttr, true);
  54.         }
  55.       }
  56.     })
  57.   }
  58.   else {
  59.     targetsFound = false;
  60.   }
  61.  
  62.   //--- Get the timer-control variable for this selector.
  63.   var controlObj = waitForKeyElements.controlObj || {};
  64.   var controlKey = selectorTxt.replace(/[^\w]/g, "_");
  65.   var timeControl = controlObj[controlKey];
  66.  
  67.   //--- Now set or clear the timer as appropriate.
  68.   if (targetsFound && waitOnce && timeControl) {
  69.     //--- The only condition where we need to clear the timer.
  70.     clearInterval(timeControl);
  71.     delete controlObj[controlKey]
  72.   }
  73.   else {
  74.     //--- Set a timer, if needed.
  75.     if (!timeControl) {
  76.       timeControl = setInterval(function () {
  77.         waitForKeyElements(selectorTxt,
  78.           actionFunction,
  79.           waitOnce,
  80.           iframeSelector
  81.         );
  82.       },
  83.         300
  84.       );
  85.       controlObj[controlKey] = timeControl;
  86.     }
  87.   }
  88.   waitForKeyElements.controlObj = controlObj;
  89. }

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