Node Mutation Hook Library

A wrapper around MutationObserver to hook into creation of elements (filtered on CSS selector) or removal of nodes.

Questo script non dovrebbe essere installato direttamente. È una libreria per altri script da includere con la chiave // @require https://update.greasyfork.org/scripts/565361/1757829/Node%20Mutation%20Hook%20Library.js

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// ==UserScript==
// @name        Node Mutation Hook Library
// @namespace   https://greasyfork.org/users/1545341
// @version     3.0.0
// @license     MIT
// @author      abcenjoyer
// @description A wrapper around MutationObserver to hook into creation of elements (filtered on CSS selector) or removal of nodes.
// ==/UserScript==

// callbacks should return a truthy value when they want no more elements to be processed, and falsy value when they want to continue processing
function hookCreation(selector, callback, callbackOnExisting) {
  const observerTarget = document.documentElement;

  if (callbackOnExisting) {
    for (const element of observerTarget.querySelectorAll(selector)) {
      if (callback(element)) {
        return;
      }
    }
  }

  const observer = new MutationObserver((mutations) => {
    for (const record of mutations) {
      for (const node of record.addedNodes) {
        if (node.nodeType === Node.ELEMENT_NODE) {
          if (node.matches(selector)) {
            if (callback(node)) {
              observer.disconnect();
              return;
            }
          }

          for (const element of node.querySelectorAll(selector)) {
            if (callback(element)) {
              observer.disconnect();
              return;
            }
          }
        }
      }
    }
  });

  observer.observe(observerTarget, {
    childList: true,
    subtree: true
  });
}

function hookRemoval(targetNode, callback) {
  const observer = new MutationObserver((mutations) => {
    for (const record of mutations) {
      for (const node of record.removedNodes) {
          if (node.contains(targetNode)) {
            observer.disconnect();
            callback();
          }
      }
    }
  });

  // observing the entire document is required because if targetNode is deleted because an ancestor node was, observing the parent won't work
  observer.observe(document, {
    childList: true,
    subtree: true
  });
}