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waitForKeyElements3

Find the specified element and execute subsequent code after finding it. This code is rewritten by BrockA's waitForKeyElements.js and uses the native js environment.

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/523085/1519645/waitForKeyElements3.js 

  1. // ==UserScript==
  2. // @name         WaitForKeyElements3
  3. // @namespace    http://tampermonkey.net/
  4. // @version      1.0
  5. // @description  Find the specified element and execute subsequent code after finding it. 
  6. // @author       Zero
  7. // @grant        none
  8. // ==/UserScript==
  9.  
  10. // Example usage:
  11. // waitForKeyElements("div.comments", {"textContent":"xxx"}, commentCallbackFunction);
  12. // function commentCallbackFunction(node) {
  13. //     node.textContent = "This comment changed by waitForKeyElements().";
  14. // }
  15.  
  16. function waitForKeyElements(
  17. 	selectorTxt,    // Required: The CSS selector string that specifies the desired element(s).
  18. 	actionFunction, // Required: The code to run when elements are found. It is passed the matched element.
  19. 	attributeFilter,// Optional: Filter the element by target attribute(s).
  20. 	bWaitOnce,      // Optional: If false, will continue to scan for new elements even after the first match is found.
  21. 	iframeSelector  // Optional: If set, identifies the iframe to search.
  22. ) {
  23. 	var targetNodes, btargetsFound = false;
  24.  
  25. 	function querySelectorAllInIframe(iframe, selector) {
  26. 		var doc = iframe.contentDocument || iframe.contentWindow.document;
  27. 		return doc.querySelectorAll(selector);
  28. 	}
  29.  
  30. 	if (typeof iframeSelector !== "undefined") {
  31. 		var iframe = document.querySelector(iframeSelector);
  32. 		if (iframe) {
  33. 			targetNodes = querySelectorAllInIframe(iframe, selectorTxt);
  34. 		}
  35. 	} else {
  36. 		targetNodes = document.querySelectorAll(selectorTxt);
  37. 	}
  38.  
  39. 	if (targetNodes && targetNodes.length > 0) {
  40. 		btargetsFound = true;
  41. 		// Found target node(s). Go through each and act if they are new.
  42. 		targetNodes.forEach(function (node) {
  43. 		    if (attributeFilter){
  44. 		        for (let attr of Object.keys(attributeFilter)){
  45. 		            if(node[attr] != attributeFilter[attr]){
  46. 		                return ;
  47. 		            }
  48. 		        }
  49. 		    }
  50. 			var alreadyFound = node.dataset.alreadyFound || false;
  51. 			if (!alreadyFound) {
  52. 				// Call the payload function.
  53. 				var cancelFound = actionFunction ? actionFunction(node) : console.log(node);
  54. 				if (cancelFound) {
  55. 					btargetsFound = false;
  56. 				} else {
  57. 					node.dataset.alreadyFound = true;
  58. 				}
  59. 			}
  60. 		});
  61. 	}
  62.  
  63. 	// Get the timer-control variable for this selector.
  64. 	var controlObj = waitForKeyElements.controlObj || {};
  65. 	var controlKey = selectorTxt.replace(/[^\w]/g, "_");
  66. 	var timeControl = controlObj[controlKey];
  67.  
  68. 	// Now set or clear the timer as appropriate.
  69. 	if (btargetsFound && bWaitOnce && timeControl) {
  70. 		// The only condition where we need to clear the timer.
  71. 		clearInterval(timeControl);
  72. 		delete controlObj[controlKey];
  73. 	} else {
  74. 		// Set a timer, if needed.
  75. 		if (!timeControl) {
  76. 			timeControl = setInterval(function () {
  77. 				waitForKeyElements(selectorTxt, actionFunction, attributeFilter, bWaitOnce, iframeSelector);
  78. 			}, 300);
  79. 			controlObj[controlKey] = timeControl;
  80. 		}
  81. 	}
  82. 	waitForKeyElements.controlObj = controlObj;
  83. };