MutationObserver wrapper to wait for the specified CSS selector
Per
Dit script moet niet direct worden geïnstalleerd - het is een bibliotheek voor andere scripts om op te nemen met de meta-richtlijn // @require https://update.greasyfork.org/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;
}