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setMutationHandler

MutationObserver wrapper to wait for the specified CSS selector

当前为 2015-09-05 提交的版本，查看 最新版本。

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/12228/72411/setMutationHandler.js 

  1. /* EXAMPLE:
  2. 	
  3. 	setMutationHandler(document, '.container p.some-child', function(observer, nodes) {
  4. 		// single node:
  5. 		nodes[0].remove();
  6. 		
  7. 		// or multiple nodes:
  8. 		[].forEach.call(nodes, function(node) {
  9. 			node.style.display = 'none';
  10. 		});
  11.  
  12. 		//observer.disconnect(); // disconnect the observer, this is useful for one-time jobs
  13. 		return true; // continue enumerating current batch of mutations
  14. 	});
  15. */
  16.  
  17. // ==UserScript==
  18. // @name          setMutationHandler
  19. // @description   MutationObserver wrapper to wait for the specified CSS selector
  20. // @namespace     wOxxOm.scripts
  21. // @author        wOxxOm
  22. // @grant         none
  23. // @version       1
  24. // ==/UserScript==
  25.  
  26. function setMutationHandler(baseNode, selector, cb) {
  27. 	var ob = new MutationObserver(function(mutations) {
  28. 		for (var i=0, ml=mutations.length, m; (i<ml) && (m=mutations[i]); i++)
  29. 			for (var j=0, nodes=m.addedNodes, nl=nodes.length, n; (j<nl) && (n=nodes[j]); j++)
  30. 				if (n.nodeType == 1) 
  31. 					if ((n = n.matches(selector) ? [n] : n.querySelectorAll(selector)) && n.length)
  32. 						if (!cb(ob, n))
  33. 							return;
  34. 	});
  35. 	ob.observe(baseNode, {subtree:true, childList:true}); 
  36. }