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Web/API/MutationObserver を更新 #23155

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Aug 23, 2024
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Web/API/MutationObserver を更新 #23155

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17 changes: 9 additions & 8 deletions files/ja/web/api/mutationobserver/index.md
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Original file line number Diff line number Diff line change
@@ -1,11 +1,13 @@
---
title: MutationObserver
slug: Web/API/MutationObserver
l10n:
sourceCommit: 32305cc3cf274fbfdcc73a296bbd400a26f38296
---

{{APIRef("DOM WHATWG")}}

{{domxref("MutationObserver")}} インターフェイスは、 [DOM](/ja/docs/Web/API/Document_Object_Model) ツリーへ変更が加えられたことを監視することができる機能を提供します。これは DOM3 Events の仕様で定義されていた [Mutation Events](/ja/docs/Web/API/MutationEvent) 機能の置き換えとして設計されたものです。
**`MutationObserver`** インターフェイスは、 [DOM](/ja/docs/Web/API/Document_Object_Model) ツリーへ変更が加えられたことを監視することができる機能を提供します。これは DOM3 Events の仕様で定義されていた [Mutation Events](/ja/docs/Web/API/MutationEvent) 機能の置き換えとして設計されたものです。

## コンストラクター

Expand All @@ -23,7 +25,7 @@ slug: Web/API/MutationObserver

## Mutation Observer と resize イベントリスナーのカスタマイズとデモ

<https://codepen.io/webgeeker/full/YjrZgg/>
<https://codepen.io/milofultz/pen/LYjPXPw>

## 例

Expand All @@ -37,13 +39,12 @@ const targetNode = document.getElementById("some-id");
const config = { attributes: true, childList: true, subtree: true };

// 変更が発見されたときに実行されるコールバック関数
const callback = function (mutationsList, observer) {
// Use traditional 'for loops' for IE 11
for (const mutation of mutationsList) {
const callback = (mutationList, observer) => {
for (const mutation of mutationList) {
if (mutation.type === "childList") {
console.log("A child node has been added or removed.");
console.log("子ノードが追加または削除されました。");
} else if (mutation.type === "attributes") {
console.log("The " + mutation.attributeName + " attribute was modified.");
console.log(`${mutation.attributeName} 属性が変更されました。`);
}
}
};
Expand Down Expand Up @@ -71,6 +72,6 @@ observer.disconnect();
- {{domxref('PerformanceObserver')}}
- {{domxref('ResizeObserver')}}
- {{domxref('IntersectionObserver')}}
- [A brief overview](https://updates.html5rocks.com/2012/02/Detect-DOM-changes-with-Mutation-Observers)
- [A brief overview](https://developer.chrome.com/blog/detect-dom-changes-with-mutation-observers/)
- [A more in-depth discussion](https://hacks.mozilla.org/2012/05/dom-mutationobserver-reacting-to-dom-changes-without-killing-browser-performance/)
- [A screencast by Chromium developer Rafael Weinstein](https://www.youtube.com/watch?v=eRZ4pO0gVWw)