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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.

目前为 2025-01-07 提交的版本。查看 最新版本。

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.cn-greasyfork.org/scripts/523085/1516446/waitForKeyElements3.js 

  1. // Example usage:
  2. // waitForKeyElements("div.comments", {"textContent":"xxx"}, commentCallbackFunction);
  3. // function commentCallbackFunction(node) {
  4. //     node.textContent = "This comment changed by waitForKeyElements().";
  5. // }
  6.  
  7. function waitForKeyElements(
  8. 	selectorTxt,    // Required: The CSS selector string that specifies the desired element(s).
  9. 	attributeFilter,// Optional: Filter the element by target attribute(s).
  10. 	actionFunction, // Required: The code to run when elements are found. It is passed the matched element.
  11. 	bWaitOnce,      // Optional: If false, will continue to scan for new elements even after the first match is found.
  12. 	iframeSelector  // Optional: If set, identifies the iframe to search.
  13. ) {
  14. 	var targetNodes, btargetsFound = false;
  15.  
  16. 	function querySelectorAllInIframe(iframe, selector) {
  17. 		var doc = iframe.contentDocument || iframe.contentWindow.document;
  18. 		return doc.querySelectorAll(selector);
  19. 	}
  20.  
  21. 	if (typeof iframeSelector !== "undefined") {
  22. 		var iframe = document.querySelector(iframeSelector);
  23. 		if (iframe) {
  24. 			targetNodes = querySelectorAllInIframe(iframe, selectorTxt);
  25. 		}
  26. 	} else {
  27. 		targetNodes = document.querySelectorAll(selectorTxt);
  28. 	}
  29.  
  30. 	if (targetNodes && targetNodes.length > 0) {
  31. 		btargetsFound = true;
  32. 		// Found target node(s). Go through each and act if they are new.
  33. 		targetNodes.forEach(function (node) {
  34. 		    if (attributeFilter){
  35. 		        for (let attr of Object.keys(attributeFilter)){
  36. 		            if(node[attr] != attributeFilter[attr]){
  37. 		                return ;
  38. 		            }
  39. 		        }
  40. 		    }
  41. 			var alreadyFound = node.dataset.alreadyFound || false;
  42. 			if (!alreadyFound) {
  43. 				// Call the payload function.
  44. 				var cancelFound = actionFunction(node);
  45. 				if (cancelFound) {
  46. 					btargetsFound = false;
  47. 				} else {
  48. 					node.dataset.alreadyFound = true;
  49. 				}
  50. 			}
  51. 		});
  52. 	}
  53.  
  54. 	// Get the timer-control variable for this selector.
  55. 	var controlObj = waitForKeyElements.controlObj || {};
  56. 	var controlKey = selectorTxt.replace(/[^\w]/g, "_");
  57. 	var timeControl = controlObj[controlKey];
  58.  
  59. 	// Now set or clear the timer as appropriate.
  60. 	if (btargetsFound && bWaitOnce && timeControl) {
  61. 		// The only condition where we need to clear the timer.
  62. 		clearInterval(timeControl);
  63. 		delete controlObj[controlKey];
  64. 	} else {
  65. 		// Set a timer, if needed.
  66. 		if (!timeControl) {
  67. 			timeControl = setInterval(function () {
  68. 				waitForKeyElements(selectorTxt, attributeFilter, actionFunction, bWaitOnce, iframeSelector);
  69. 			}, 300);
  70. 			controlObj[controlKey] = timeControl;
  71. 		}
  72. 	}
  73. 	waitForKeyElements.controlObj = controlObj;
  74. };