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setMutationHandler

MutationObserver wrapper to wait for the specified CSS selector

Fra og med 22.07.2016. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greatest.deepsurf.us/scripts/12228/137548/setMutationHandler.js 

/* EXAMPLE:
	
	setMutationHandler(document, '.container p.some-child', function(nodes) {
		// single node:
		nodes[0].remove();
		
		// or multiple nodes:
		nodes.forEach(function(node) {
			node.style.display = 'none';
		});

		//this.disconnect(); // disconnect the observer, this is useful for one-time jobs
		return true; // continue enumerating current batch of mutations
	});
*/

// ==UserScript==
// @name          setMutationHandler
// @description   MutationObserver wrapper to wait for the specified CSS selector
// @namespace     wOxxOm.scripts
// @author        wOxxOm
// @grant         none
// @version       2.0.7
// ==/UserScript==

function setMutationHandler(baseNode, selector, cb, options) {
	var queue = [];
	var timer;
	var ob = new MutationObserver(function handler(mutations) {
		if (mutations && mutations.length > 100) {
			if (!queue.length)
				setTimeout(handler, 0);
			queue.push(mutations);
			return;
		}
		do {
			if (!mutations) {
				mutations = queue.shift();
				if (!mutations)
					return;
			}

			for (var i=0, ml=mutations.length; i < ml; i++) {
				var 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))
								n = [n];
							else if (n.querySelector(selector))
								n = Array.prototype.slice.call(n.querySelectorAll(selector));
							else
								continue;
							if (!cb.call(ob, n, m))
								return;
						}
						if (textNodesOnly && m.target.matches(selector) && !cb.call(ob, [m.target], m))
							return;
						break;
					case 'attributes':
						if (m.target.matches(selector) && !cb.call(ob, [m.target], m))
							return;
						break;
					case 'characterData':
						if (m.target.parentNode && m.target.parentNode.matches(selector) && !cb.call(ob, [m.target.parentNode], m))
							return;
						break;
				}
			}
			mutations = null;
		} while (queue.length);
	});
	ob.observe(baseNode, options || {subtree:true, childList:true});
	return ob;
}