{"id":12684,"date":"2019-02-04T09:00:01","date_gmt":"2019-02-04T00:00:01","guid":{"rendered":"https:\/\/www.agent-grow.com\/self20percent\/?p=12684"},"modified":"2019-01-22T16:20:30","modified_gmt":"2019-01-22T07:20:30","slug":"js-mutationobserver","status":"publish","type":"post","link":"https:\/\/www.agent-grow.com\/self20percent\/2019\/02\/04\/js-mutationobserver\/","title":{"rendered":"MutationObserver … JavaScript \u304b\u3089 DOM \u3092\u76e3\u8996\u3059\u308b\u65b0\u3057\u3044\u65b9\u6cd5"},"content":{"rendered":"

JavaScript \u3067\u30da\u30fc\u30b8\u4e0a\u306e\u52d5\u304d\u3092\u62fe\u3046\u306b\u306f\u2026\uff1f<\/h1>\n

\u3053\u3093\u306b\u3061\u306f\u3001\u6c5f\u5d5c\u3067\u3059\u3002<\/p>\n

\u307f\u306a\u3055\u3093\u3001JavaScript \u66f8\u3044\u3066\u307e\u3059\u3088\u306d\uff01<\/p>\n

\u5927\u4f53 Web \u30a2\u30d7\u30ea\u4f5c\u3063\u3066\u308b\u3068\u304d\u306b JavaScript \u66f8\u304f\u3068\u306a\u308b\u3068\u3001\u3084\u308a\u305f\u3044\u3053\u3068\u3063\u3066
\n\u300c\u30c6\u30ad\u30b9\u30c8\u30dc\u30c3\u30af\u30b9\u306b\u6587\u5b57\u3092\u5165\u529b\u3055\u308c\u305f\u3068\u304d\u306b\u30fc\u300d\u3068\u304b\u3001
\n\u300c\u30dc\u30bf\u30f3\u62bc\u3055\u308c\u305f\u3068\u304d\u306b\u30fc\u300d\u3068\u304b\u3060\u3068\u601d\u3046\u3093\u3067\u3059\u3051\u3069\u3001
\n\u305d\u3046\u3044\u3063\u305f\u52d5\u304d\u306f\u3069\u3046\u3084\u3063\u3066 JavaScript \u3067\u691c\u77e5\u3057\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n

\u305d\u3046\u3067\u3059\u306d\u3001 on<\/code> \u3068\u304b addEventListener<\/code> \u3068\u304b\u3001
\n\u52d5\u4f5c\u6642\u306b\u767a\u751f\u3059\u308b\u30a4\u30d9\u30f3\u30c8\u3092\u76e3\u8996\u3057\u3066\u3001\u305d\u306e\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306b
\n\u4f55\u304b\u3057\u3089\u306e\u52d5\u4f5c\u3092\u3055\u305b\u308b\u2026\u3068\u3044\u3046\u306e\u304c\u666e\u901a\u306e\u3084\u308a\u65b9\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u4f8b\u3048\u3070\u3001\u30b5\u30f3\u30d7\u30eb\u306a\u3093\u304b\u3067\u3088\u304f\u3042\u308b\u300c\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u305f\u3068\u304d\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u300d\u3068\u304b\u3060\u3068<\/p>\n

\nconst hoge = getElementById(&#039;hoge&#039;);\nhoge.addEventListener(&#039;click&#039;, function () {\n  console.log(&#039;\u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\uff01&#039;);\n});\n<\/pre>\n
\u307f\u305f\u3044\u306a\u3084\u308a\u304b\u305f\u304c\u666e\u901a\u3001\u3067\u3059\u306d\u3002<\/p>\n
\u3053\u306e\u8fba\u3067\u30ab\u30f3\u306e\u826f\u3044\u65b9\u306f\u306a\u3093\u3068\u306a\u304f\u3001\u4eca\u65e5\u306e\u8a71\u984c\u304c\u5206\u304b\u3063\u3066\u304d\u307e\u3059\u306d\u3002
\n\u305d\u3046\u3067\u3059\u3002\u4eca\u56de\u306f\u305d\u306e\u3001\u666e\u901a\u306e\u65b9\u6cd5\u3067\u306f\u306a\u3044\u3084\u308a\u65b9\u3067\u3001\u30da\u30fc\u30b8\u4e0a\u306e\u52d5\u304d\u3092\u691c\u77e5\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
MutationObserver \u3068\u3044\u3046\u3082\u306e\u304c\u6700\u8fd1\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\uff01<\/h1>\n
\u30a4\u30d9\u30f3\u30c8\u3067\u306a\u3051\u308c\u3070\u3069\u3046\u3084\u308b\u306e\u2026\uff1f\u3068\u3044\u3046\u3068\u3053\u308d\u3067\u3001\u4eca\u56de\u306f\u3053\u3061\u3089\u3002
\n\u300cMutationObserver\u300d\u3092\u4f7f\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
\u3068\u308a\u3042\u3048\u305a JavaScript \u3067\u521d\u3081\u3066\u51fa\u4f1a\u3063\u305f\u3082\u306e\u306f\u3001 MDN \u3067\u3057\u3089\u3079\u3066\u307f\u307e\u3057\u3087\u3046\u3002
\nhttps:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/MutationObserver<\/p>\n
\n  MutationObserver \u3068\u306f\u3001\u6307\u5b9a\u3057\u305f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092 DOM \u306e\u5909\u66f4\u6642\u306b\u5b9f\u884c\u3055\u305b\u308b API \u3067\u3059\u3002\n<\/p><\/blockquote>\n
\u3064\u307e\u308a\u3001\u30a4\u30e1\u30fc\u30b8\u7684\u306b\u306f\u3001\u3053\u308c\u307e\u3067\u30a4\u30d9\u30f3\u30c8\u3092\u4f7f\u3063\u3066\u3044\u305f\u6642\u306f
\n\u300c\u6587\u5b57\u304c\u5165\u529b\u3055\u308c\u305f\uff01\u300d\u300c\u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\uff01\u300d\u3068\u3044\u3046\u4e8b\u67c4\u304c\u767a\u751f\u3057\u305f\u6642\u306b\u6307\u5b9a\u3057\u305f\u52d5\u4f5c\u3092\u3055\u305b\u3066\u3044\u307e\u3057\u305f\u304c\u3001
\n\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u3068\u3057\u3066\u300cDOM \u304c\u66f4\u65b0\u3055\u308c\u305f\uff01\u300d\u3068\u3044\u3046\u3053\u3068\u3092\u304d\u3063\u304b\u3051\u306b\u6307\u5b9a\u3057\u305f\u52d5\u4f5c\u3092\u5b9f\u884c\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n
\u2026\u3061\u3087\u3063\u3068\u8a00\u8449\u3067\u8aac\u660e\u3059\u308b\u306e\u96e3\u3057\u3044\u3093\u3067\u3001\u3068\u308a\u3042\u3048\u305a\u4f8b\u984c\u8a00\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u5b9f\u8df5<\/h1>\n
\u3055\u3066\u3001\u30b5\u30b5\u3063\u3068\u30b3\u30fc\u30c9\u66f8\u3044\u3066\u307f\u307e\u3059\u3002<\/p>\n
\u4eca\u56de\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u30fc\u2026<\/p>\n
HTML<\/p>\n
\n&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n&lt;head&gt;\n  &lt;meta charset=&quot;utf-8&quot;&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n  &lt;button id=&quot;btn&quot;&gt;click me&lt;\/button&gt;\n  &lt;div id=&quot;target&quot;&gt;\n  &lt;\/div&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre>\n
JS<\/p>\n
\nconst target = document.getElementById(&#039;target&#039;);\n\n\/\/ MutationObserver \u4f5c\u6210\nconst observer = new MutationObserver(function () {\n  console.log(target.children.length);\n});\n\nconst config = { attributes: true, childList: true, characterData: true };\n\n\/\/ \u76e3\u8996\u5b9f\u884c\nobserver.observe(target, config);\n\n\n\/\/ \u30dc\u30bf\u30f3\u3092\u62bc\u3057\u305f\u3089 target \u8981\u7d20\u5185\u306b div \u3092\u8ffd\u52a0\u3059\u308b\nconst btn = document.getElementById(&#039;btn&#039;);\n\nbtn.addEventListener(&#039;click&#039;, function (e) {\n  e.preventDefault();\n  const div = document.createElement(&#039;div&#039;);\n  div.textContent = &quot;added.&quot;\n  target.appendChild(div);\n})\n<\/pre>\n
\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u305f\u3089 target ID \u306e\u8981\u7d20\u5185\u306b
\ndiv \u304c\u4e00\u3064\u8ffd\u52a0\u3055\u308c\u308b\u3001\u3068\u3044\u3046\u5185\u5bb9\u3067\u3059\u306d\u3002<\/p>\n
\u4eca\u56de\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u524d\u534a\u90e8\u5206\u3002<\/p>\n
\nconst observer = new MutationObserver(function () {\n  console.log(target.children.length);\n});\n<\/pre>\n
\u3053\u3053\u3067\u306f MutationObserver \u3092\u4f5c\u6210\u3057\u3066\u3001
\n\u5909\u66f4\u304c\u8d77\u3053\u3063\u305f\u969b\u306b\u4f55\u3092\u3059\u308b\u304b\u3092\u95a2\u6570\u3067\u6e21\u3057\u3066\u3042\u3052\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
\u4eca\u56de\u306f target \u8981\u7d20\u5185\u306e\u8981\u7d20\u6570\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3055\u305b\u3066\u307f\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u3067\u306f MutationObserver \u3092\u4f5c\u6210\u3057\u3066\u3082\u3001
\n\u307e\u3060\u5b9f\u969b\u306b\u3069\u306e\u8981\u7d20\u3092\u76e3\u8996\u3059\u308b\u3079\u304d\u304b\u3001\u3068\u3044\u3046\u3053\u3068\u306b\u3064\u3044\u3066\u306f\u6307\u5b9a\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3002<\/p>\n
\nobserver.observe(target, config);\n<\/pre>\n
\u3067\u3001\u3053\u3061\u3089\u3067\u3059\u306d\u3002
\n\u4f5c\u6210\u3057\u305f MutationObserver \u306b\u5bfe\u3057\u3066\u3001 observe<\/code> \u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u306d\u3002
\n\u3053\u306e\u6642\u3001\u7b2c\u4e00\u5f15\u6570\u306e\u65b9\u306b\u76e3\u8996\u5bfe\u8c61\u3068\u306a\u308b\u8981\u7d20\u3092\u3001
\n\u7b2c\u4e8c\u5f15\u6570\u306e\u65b9\u306b\u306f\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u6e21\u3057\u3066\u3042\u3052\u307e\u3059\u3002<\/p>\n
\u5b9f\u969b\u306b\u3053\u308c\u3092\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u2026
\n( \u4eca\u56de\u306f https:\/\/jsbin.com\/ \u3067\u5b9f\u884c\u3057\u3066\u307f\u3066\u3044\u307e\u3059)<\/p>\n
\"\"<\/p>\n
\u78ba\u304b\u306b\u3001\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u3066\u8981\u7d20\u304c\u8ffd\u52a0\u3055\u308c\u308b\u3068\u540c\u6642\u306b\u3001
\n\u30b3\u30f3\u30bd\u30fc\u30eb\u306e\u65b9\u306b\u306f 1,2,3 … \u3068\u6570\u5b57\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u306d\uff01<\/p>\n
\u3044\u3044\u30ab\u30f3\u30b8\u3067\u3059\uff01<\/p>\n
MutationObserver \u306b\u6307\u5b9a\u3067\u304d\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306f
\nhttps:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/MutationObserver#MutationObserverInit
\n\u3053\u3061\u3089\u3092\u898b\u3066\u3082\u3089\u3063\u305f\u3089\u5206\u304b\u308a\u3084\u3059\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u8981\u306f\u5bfe\u8c61\u306e DOM \u306e\u5b50\u4f9b\u3082\u76e3\u8996\u3059\u308b\u304b\u3068\u304b\u3001 DOM \u306e\u5c5e\u6027\u3082\u76e3\u8996\u3059\u308b\u304b\u3068\u304b\u3001\u305d\u3046\u3044\u3063\u305f\u8a2d\u5b9a\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n
MutationObserver \u306e\u4f7f\u3044\u3069\u3053\u308d<\/h1>\n
\u3068\u3044\u3046\u3053\u3068\u3067\u3001DOM \u304c\u66f4\u65b0\u3055\u308c\u305f\u3053\u3068\u3092\u691c\u77e5\u3067\u304d\u308b MutationObserver \u3092\u7d39\u4ecb\u3044\u305f\u3057\u307e\u3057\u305f\u3002<\/p>\n
\u304c\u3001\u3082\u3057\u304b\u3057\u305f\u3089\u3053\u3046\u601d\u308f\u308c\u3066\u3044\u308b\u65b9\u3082\u3044\u3089\u3063\u3057\u3083\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u3067\u3059\u306d\u3002<\/p>\n
\u300cDOM \u306e\u66f4\u65b0\u3092\u691c\u77e5\u3067\u304d\u3066\u4f55\u304c\u3046\u308c\u3057\u3044\u306e\uff1f\u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u3060\u3063\u3066\u3001\u7d50\u5c40\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3068\u304d\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u4f7f\u3046\u306e\u3068\u5909\u308f\u3089\u306a\u304f\u306a\u3044\uff1f\u300d<\/p>\n
\u78ba\u304b\u306b\u305d\u3046\u3067\u3059\u306d\u3002
\n\u666e\u901a\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u66f8\u3044\u3066\u3044\u3066\u3001 MutationObserver \u4f7f\u3044\u305f\u3044\uff01\u3063\u3066\u601d\u3046\u3088\u3046\u306a\u3053\u3068\u306f\u307e\u305a\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u3067\u306f\u3044\u3064\u4f7f\u3046\u306e\u304b\u2026\u305d\u308c\u306f\u2026
\nBrowser extension\u3000\u306e\u4f5c\u6210\u6642\u3067\u3059\u306d\uff01<\/p>\n
\u3044\u308f\u3086\u308b\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u300c\u62e1\u5f35\u6a5f\u80fd\u300d\u3068\u547c\u3070\u308c\u3066\u3044\u308b\u30e4\u30c4\u3067\u3059\u3002<\/p>\n
\"\"<\/p>\n
Google Chrome \u306a\u3089\u3053\u3093\u306a\u611f\u3058\u3067\u3001\u53f3\u4e0a\u306b\u5c0f\u3055\u3044\u30a2\u30a4\u30b3\u30f3\u304c\u4e26\u3076\u3001
\n\u30d6\u30e9\u30a6\u30b6\u306e\u6a5f\u80fd\u3092\u62e1\u5f35\u3057\u3066\u304f\u308c\u308b\u30e4\u30c4\u3067\u3059\u3002<\/p>\n
\u5f7c\u3089\u306f\u73fe\u5728\u958b\u3044\u3066\u3044\u308b\u30da\u30fc\u30b8\u306b\u5bfe\u3057\u3066\u3001\u4fbf\u5229\u306a\u30dc\u30bf\u30f3\u3092\u8ffd\u52a0\u3057\u3066\u304f\u308c\u305f\u308a\u3001
\n\u60c5\u5831\u3092\u53ce\u96c6\u3057\u3066\u304f\u308c\u305f\u308a\u3068\u4fbf\u5229\u306a\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u304c\u3001\u3057\u304b\u3057\u3001\u5f7c\u3089\u306f\u8a00\u3063\u3066\u3057\u307e\u3048\u3070\u300c\u52dd\u624b\u306b\u300d\u30da\u30fc\u30b8\u306b\u4ecb\u5165\u3057\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u304b\u3089\u3001\u8a73\u7d30\u306a\u753b\u9762\u306e\u8a2d\u8a08\u306a\u3069\u306f\u5165\u624b\u3067\u304d\u307e\u305b\u3093\u3057\u3001\u305d\u308c\u306b\u3001\u69d8\u3005\u306a\u30da\u30fc\u30b8\u306b\u5bfe\u5fdc\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002
\n\u52d5\u7684\u306b\u753b\u9762\u304c\u5909\u308f\u308b\u30da\u30fc\u30b8\u3067\u306f\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u4f7f\u3063\u3066\u6b63\u3057\u304f\u5909\u5316\u306b\u8ffd\u5f93\u3059\u308b\u306e\u306f\u5c11\u3057\u96e3\u3057\u3044\u3068\u3053\u308d\u304c\u3042\u308b\u306e\u3067\u3059\u306d\u3002<\/p>\n
\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u3053\u306e MutationObserver \u3092\u4f7f\u3048\u3070\u3001\u78ba\u5b9f\u306b\u753b\u9762\u306e\u5909\u63db\u306b\u5bfe\u5fdc\u304c\u3067\u304d\u308b\u3001\u3068\u3044\u3046\u4e8b\u3067\u3001\u3068\u3066\u3082\u4fbf\u5229\u306b\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3059\uff01<\/p>\n
\u7686\u3055\u3093\u3082\u3001\u4f7f\u3063\u3066\u307f\u308b\u3068\u7d50\u69cb\u4fbf\u5229\u306a MutationObserver \u3001\u4f7f\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
JavaScript \u3067\u30da\u30fc\u30b8\u4e0a\u306e\u52d5\u304d\u3092\u62fe\u3046\u306b\u306f\u2026\uff1f \u3053\u3093\u306b\u3061\u306f\u3001\u6c5f\u5d5c\u3067\u3059\u3002 \u307f\u306a\u3055\u3093\u3001JavaScript \u66f8\u3044\u3066\u307e\u3059\u3088\u306d\uff01 \u5927\u4f53 Web \u30a2\u30d7\u30ea\u4f5c\u3063\u3066\u308b\u3068\u304d\u306b JavaScript \u66f8\u304f\u3068\u306a\u308b\u3068\u3001\u3084\u308a\u305f\u3044\u3053\u3068\u3063\u3066 \u300c […]<\/p>\n","protected":false},"author":15,"featured_media":12729,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10],"tags":[45],"class_list":["post-12684","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tech","tag-javascript"],"jetpack_featured_media_url":"https:\/\/www.agent-grow.com\/self20percent\/wp-content\/uploads\/2019\/01\/850c7612116999490846136e772ab7fd-3.png","jetpack_shortlink":"https:\/\/wp.me\/p7Bq4F-3iA","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/posts\/12684","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/comments?post=12684"}],"version-history":[{"count":0,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/posts\/12684\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/media\/12729"}],"wp:attachment":[{"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/media?parent=12684"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/categories?post=12684"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.agent-grow.com\/self20percent\/wp-json\/wp\/v2\/tags?post=12684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}