MutationObserver wrapper to wait for the specified CSS selector
目前为
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.cn-greasyfork.org/scripts/12228/141649/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
});
*/
// ==UserScript==
// @name setMutationHandler
// @description MutationObserver wrapper to wait for the specified CSS selector
// @namespace wOxxOm.scripts
// @author wOxxOm
// @grant none
// @version 2.0.8
// ==/UserScript==
function setMutationHandler(baseNode, selector, cb, options) {
var ob = new MutationObserver(function MOhandler(mutations) {
if (mutations.length > 100 && !document.querySelector(selector))
return;
var found = [];
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))
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(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)
cb.call(ob, found);
});
ob.observe(baseNode, options || {subtree:true, childList:true});
return ob;
}