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setMutationHandler

MutationObserver wrapper to wait for the specified CSS selector

Verzia zo dňa 10.02.2017. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greatest.deepsurf.us/scripts/12228/174269/setMutationHandler.js 

/* EXAMPLE:

	setMutationHandler(document, '.container p.some-child', function(nodes) {
		// single node:
		nodes[0].remove();

		// or multiple nodes:
		nodes.forEach(node => node.style.display = 'none');

		// disconnect the observer, this is useful for one-time jobs
		return false;
	});
*/

// ==UserScript==
// @name          setMutationHandler
// @description   MutationObserver wrapper to wait for the specified CSS selector
// @namespace     wOxxOm.scripts
// @author        wOxxOm
// @grant         none
// @version       2.1.0
// ==/UserScript==

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

	function MOhandler(mutations, observer) {
		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 (cb.call(ob, found) === false)
			ob.disconnect();
	}

	function MOhandlerForId(mutations, observer) {
		var el = document.getElementById(selector);
		if (!el || !baseNode.contains(el))
			return;
		if (cb.call(ob, [el]) === false)
			ob.disconnect();
	}
}