setMutationHandler

MutationObserver wrapper to wait for the specified CSS selector

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/12228/175122/setMutationHandler.js 

// ==UserScript==
// @name          setMutationHandler
// @description   MutationObserver wrapper to wait for the specified CSS selector
// @namespace     wOxxOm.scripts
// @author        wOxxOm
// @grant         none
// @version       3.0.2
// ==/UserScript==

function setMutationHandler(target, selector, handler, options) {
// or    setMutationHandler(selector, handler, options) {
// or    setMutationHandler(options) {
	if (typeof arguments[0] == 'string') {
		options = arguments[2] || {};
		handler = arguments[1];
		selector = arguments[0];
		target = document;
	} else if (arguments.length == 1 && target && typeof target.handler == 'function') {
		options = arguments[0];
		handler = options.handler;
		selector = options.selector;
		target = options.target || document;
	} else if (!(target instanceof Node)) {
		throw 'Bad params for setMutationHandler.\n' +
			'A: [optional Node] target, [String] selector, [Function] handler, [optional Object] options\n' +
			'B: [Object] options\n' +
			'Options: target, selector, handler, processExisting, childList, attributes, characterData, subtree, attributeOldValue, characterDataOldValue, attributeFilter';
	} else
    	options = options || {};

	if (options.processExisting && target.querySelector(selector))
		handler.call(null, Array.prototype.slice.call(target.querySelectorAll(selector)));
	if (!options.attributes && !options.characterData && !options.childList && options.subtree === undefined)
		options.childList = options.subtree = true;

	var cb;
	if (/^#[\w\d-]+$/.test(selector)) {
		selector = selector.substr(1);
		cb = MOhandlerForId;
	} else {
		cb = MOhandler;
	}
	var observer = new MutationObserver(cb);
	observer.observe(target, options || {subtree:true, childList:true});
	return observer;

	function MOhandler(mutations) {
		if (mutations.length > 100 && !document.querySelector(selector))
			return;
		var found = [];
		for (var i=0, m; (m = mutations[i++]); ) {
			switch (m.type) {
				case 'childList':
					var nodes = m.addedNodes, nl = nodes.length;
					var textNodesOnly = true;
					for (var j=0; j < nl; j++) {
						var n = nodes[j];
						textNodesOnly &= n.nodeType == 3; // TEXT_NODE
						if (n.nodeType != 1) // ELEMENT_NODE
							continue;
						if (n.matches(selector))
							found.push(n);
						else if (n.querySelector(selector)) {
							n = n.querySelectorAll(selector);
							if (n.length < 1000)
								found.push.apply(found, n);
							else
								found = found.concat(found.slice.call(n));
						}
					}
					if (textNodesOnly && m.target.matches(selector))
						found.push(m.target);
					break;
				case 'attributes':
					if (m.target.matches(selector))
						found.push(m.target);
					break;
				case 'characterData':
					if (m.target.parentNode && m.target.parentNode.matches(selector))
						found.push(m.target.parentNode);
					break;
			}
		}
		if (!found.length)
			return;
		if (handler.call(observer, found) === false)
			observer.disconnect();
	}

	function MOhandlerForId(mutations) {
		var el = document.getElementById(selector);
		if (el && target.contains(el))
			if (handler.call(observer, [el]) === false)
				observer.disconnect();
	}
}