{"id":4281,"date":"2023-03-24T03:32:28","date_gmt":"2023-03-23T18:32:28","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=4281"},"modified":"2023-03-24T03:33:25","modified_gmt":"2023-03-23T18:33:25","slug":"javascript-queryselectorall","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript-queryselectorall\/","title":{"rendered":"JavaScript\u3067\u6700\u3082\u8fd1\u3044\u5b50\u5b6b\u8981\u7d20\u3092\u53d6\u5f97\u30fb\u64cd\u4f5c\u30fb\u5224\u5225\u3059\u308b\u65b9\u6cd5\uff08closest()\u306e\u9006\u30e1\u30bd\u30c3\u30c9\uff09\u3010querySelectorAll()\u3011"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-queryselectorall\/#querySelectorAll%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E7%9B%B4%E8%BF%91%E3%81%AE%E5%AD%90%E5%AD%AB%E8%A6%81%E7%B4%A0%E3%82%92%E6%8C%87%E5%AE%9A%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95\" >querySelectorAll()\u3092\u4f7f\u3063\u3066\u76f4\u8fd1\u306e\u5b50\u5b6b\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-queryselectorall\/#querySelectorAll%E3%81%A7%E6%8C%87%E5%AE%9A%E3%81%A7%E3%81%8D%E3%82%8B%E3%81%AE%E3%81%AF%E7%9B%B4%E8%BF%91%E3%81%AE%E5%AD%90%E5%AD%AB%E3%80%8C%E3%81%9F%E3%81%A1%E3%80%8D\" >querySelectorAll()\u3067\u6307\u5b9a\u3067\u304d\u308b\u306e\u306f\u76f4\u8fd1\u306e\u5b50\u5b6b\u300c\u305f\u3061\u300d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-queryselectorall\/#%E7%9B%B4%E8%BF%91%E3%81%AE%E5%AD%90%E5%AD%AB%E3%80%8C%E3%81%9F%E3%81%A1%E3%80%8D%E3%81%AE1%E3%81%A4%E3%81%AB%E3%82%AF%E3%83%A9%E3%82%B9%E5%90%8D%E3%82%92%E4%BB%98%E4%B8%8E%E3%81%97%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\" >\u76f4\u8fd1\u306e\u5b50\u5b6b\u300c\u305f\u3061\u300d\u306e1\u3064\u306b\u30af\u30e9\u30b9\u540d\u3092\u4ed8\u4e0e\u3057\u305f\u3044\u5834\u5408<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-queryselectorall\/#%E5%AD%90%E5%AD%AB%E8%A6%81%E7%B4%A0%E3%81%AB%E7%89%B9%E5%AE%9A%E3%81%AE%E8%A6%81%E7%B4%A0%E3%81%8C%E5%AD%98%E5%9C%A8%E3%81%99%E3%82%8B%E3%81%8B%E5%88%A4%E5%88%A5%E3%81%99%E3%82%8B%E5%A0%B4%E5%90%88\" >\u5b50\u5b6b\u8981\u7d20\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5225\u3059\u308b\u5834\u5408<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-queryselectorall\/#querySelectorAll%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6%E3%81%AE%E3%81%BE%E3%81%A8%E3%82%81\" >querySelectorAll()\u306b\u3064\u3044\u3066\u306e\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closest-ancestordom\/\">\u5148\u7956\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b<code>closest()<\/code>\u30e1\u30bd\u30c3\u30c9<\/a>\u3068\u306f\u53cd\u5bfe\u306b\u3001\u5b50\u5b6b\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f\u300c\u305d\u308c\u306f<code>find()<\/code>\u30e1\u30bd\u30c3\u30c9\u300d\u3067\u3059\u3001\u3068\u66f8\u3044\u3066\u3042\u308b\u30b5\u30a4\u30c8\u306f\u3059\u3050\u3055\u307e\u8aad\u3080\u306e\u3092\u6b62\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\uff0c3\u6b69\u8b72\u6b69\u3059\u308c\u3070\u5b8c\u5168\u306b\u9593\u9055\u3063\u3066\u306f\u3044\u307e\u305b\u3093\u304c\u3001<code>find()<\/code>\u3092\u4f7f\u3063\u3066\u5b50\u5b6b\u8981\u7d20\u3092\u53d6\u5f97\u3059\u308b\u306e\u306f\u300cjQuery\u300d\u3067\u3059\u3002\u5b9f\u306fjQuery\u3067\u306f\u76f4\u8fd1\u306e\u5148\u7956\u8981\u7d20\u3092\u8d70\u67fb\u3059\u308b\u969b\u306b\u3082<code>closest()<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u4f7f\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u5b50\u5b6b\u8981\u7d20\u306b\u95a2\u3057\u3066\u306f<code>find()<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u5229\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u3061\u306a\u307f\u306bJavaScript\u306b\u304a\u3051\u308b<code>find()<\/code>\u306f\u914d\u5217\u5468\u308a\u306e\u30e1\u30bd\u30c3\u30c9\u306a\u306e\u3067\u3053\u3053\u3067\u306f\u89e6\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"querySelectorAll%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E7%9B%B4%E8%BF%91%E3%81%AE%E5%AD%90%E5%AD%AB%E8%A6%81%E7%B4%A0%E3%82%92%E6%8C%87%E5%AE%9A%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95\"><\/span>querySelectorAll()\u3092\u4f7f\u3063\u3066\u76f4\u8fd1\u306e\u5b50\u5b6b\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-file=\"querryselectorall.html\" data-lang=\"HTML\"><code>&lt;div class=&quot;level0&quot;&gt;\n  &lt;div class=&quot;level-1&quot;&gt;\n    &lt;ul class=&quot;level-2&quot;&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p&gt;&lt;\/p&gt;&lt;\/li&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p class=&quot;targetElement&quot;&gt;&lt;\/p&gt;&lt;\/li&gt;\n    &lt;\/ul&gt;\n  &lt;\/div&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u4e0a\u8a18\u306e\u3088\u3046\u306a\u30b5\u30f3\u30d7\u30eb\u304c\u3042\u308b\u3068\u3059\u308b\u3068\u304d\u3001\u300cdiv.level0\u300d\u3092\u57fa\u6e96\u3068\u3057\u3066\u76f4\u8fd1\u306e\u300cp.tagetElement\u300d\u3092\u53d6\u5f97\u3057\u3066\u4f55\u304b\u3057\u3089\u306e\u64cd\u4f5c\u3092\u884c\u3046\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306b\u30bd\u30fc\u30b9\u3092\u66f8\u304f\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"querryselectorall.js\" data-lang=\"JavaScript\"><code>let target = document.getElementsByClassName(&#39;level0&#39;)[0].querySelectorAll(&#39;.targetElement&#39;);\nconsole.log(target);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3057\u304b\u3057\u305f\u3089\u521d\u5fc3\u8005\u306e\u65b9\u306b\u306f\u5206\u304b\u308a\u306b\u304f\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u306e\u3067\u3001\u3082\u3046\u5c11\u3057\u554f\u984c\u3092\u5207\u308a\u5206\u3051\u3066\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"querryselectorall-2.js\" data-lang=\"JavaScript\"><code>let ansestor = document.getElementsByClassName(&#39;level0&#39;)[0]; \/\/ \u610f\u56f3\u7684\u306bansestors\u3067\u306f\u306a\u304fansestor\u306b\u3057\u3066\u3044\u307e\u3059\nlet targets = ansestor.querySelectorAll(&#39;.targetElement&#39;); \/\/ \u610f\u56f3\u7684\u306btarget\u3092\u8907\u6570\u5f62\u306b\u3057\u3066\u3044\u307e\u3059\nconsole.log(targets);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u7c21\u5358\u3067\u3059\u306d\u3002\u300c<code>level0<\/code>\u300d\u3092\u8d77\u70b9\u3068\u3057\u3066<code>querySelectorAll<\/code>\u3092\u4f7f\u7528\u3057\u3066\u76f4\u8fd1\u306e\u5b50\u5b6b\u8981\u7d20\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3082\u3057\u3001<code>getElementsByClassName('level0')[0]<\/code>\u306e\u300c<code><strong>[0]<\/strong><\/code>\u300d\u304c\u5206\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u3001<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closest-ancestordom\/\">closest()\u306e\u8a18\u4e8b<\/a>\u3092\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3068\u304f\u306b\u8907\u96d1\u3067\u3082\u306a\u3044\u306e\u3067\u3053\u306e\u5f62\u3092\u982d\u306b\u7f6e\u3044\u3066\u304a\u3051\u3070\u3068\u308a\u3042\u3048\u305a\u306f\u306a\u3093\u3068\u304b\u306a\u308a\u307e\u3059\u306d\u3002\u305f\u3060\u3057\u3001\u975e\u5e38\u306b\u91cd\u8981\u306a\u76f2\u70b9\u304c\uff11\u3064\u3042\u308a\u307e\u3059\u306e\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"querySelectorAll%E3%81%A7%E6%8C%87%E5%AE%9A%E3%81%A7%E3%81%8D%E3%82%8B%E3%81%AE%E3%81%AF%E7%9B%B4%E8%BF%91%E3%81%AE%E5%AD%90%E5%AD%AB%E3%80%8C%E3%81%9F%E3%81%A1%E3%80%8D\"><\/span>querySelectorAll()\u3067\u6307\u5b9a\u3067\u304d\u308b\u306e\u306f\u76f4\u8fd1\u306e\u5b50\u5b6b\u300c\u305f\u3061\u300d<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5358\u5200\u76f4\u5165\u306b\u8a00\u3046\u3068\u3001<code>querySelectorAll()<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97\u3067\u304d\u308b\u306e\u306fElement\u305d\u308c\u81ea\u8eab\u3067\u306f\u306a\u304f\u3001\u300c<span class=\"marker\">\u8a72\u5f53\u3059\u308b\u30a8\u30ec\u30e1\u30f3\u30c8\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u914d\u5217<\/span>\u300d\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3069\u3046\u3044\u3046\u3053\u3068\u304b\uff1f\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-file=\"querryselectorall-2.html\" data-lang=\"HTML\"><code>&lt;div class=&quot;level0&quot;&gt;\n  &lt;div class=&quot;level-1&quot;&gt;\n    &lt;ul class=&quot;level-2&quot;&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p class=&quot;targetElement&quot;&gt;&lt;\/p&gt;&lt;\/li&gt;&lt;!-- targetElement\u30af\u30e9\u30b9\u4ed8\u4e0e --&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p class=&quot;targetElement&quot;&gt;&lt;\/p&gt;&lt;\/li&gt;\n    &lt;\/ul&gt;\n  &lt;\/div&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u4f8b\u3067\u306f\u5148\u307b\u3069\u3068\u9055\u3044\u3001\u300c<code>p.targetElement<\/code>\u300d\u304c2\u3064\u3042\u308a\u307e\u3059\u3002\u3069\u3061\u3089\u3082\u300c<code>div.level0<\/code>\u300d\u3092\u8d77\u70b9\u3068\u3059\u308b\u3068&#8221;\u76f4\u8fd1\u306e&#8221;\u300c<code>.targetElement<\/code>\u300d\u306b\u306a\u308a\u3001\u4e21\u65b9\u304c\u8a72\u5f53\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u304b\u3089\u304c\u30df\u30bd\u3067\u3001\u5358\u306b\u53d6\u5f97\u3057\u305f\u3082\u306e\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u305f\u308a\u3001\u4e2d\u8eab\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u6307\u5b9a\u3057\u305f\u308a\u3057\u3066\u3082\u4e0a\u624b\u304f\u3044\u304d\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u5fc5\u8981\u3068\u306a\u3063\u3066\u304f\u308b\u306e\u304c<span class=\"marker\">\u30eb\u30fc\u30d7\u51e6\u7406<\/span>\u3067\u3059\u3002\u6b21\u306e\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"querryselectorall-3.js\" data-lang=\"JavaScript\"><code>let ansestor = document.getElementsByClassName(&#39;level0&#39;)[0];\nlet targets = ansestor.querySelectorAll(&#39;.targetElement&#39;);\nconsole.log(targets);\n\n\/\/ \u5b9f\u306ftargets\u306e\u4e2d\u8eab\u306f\u914d\u5217 [ p.targetElement, p.targetElement ] \u306a\u3093\u3067\u3059\u3002<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3092\u3001\u4f8b\u3048\u3070\u5148\u982d\u306e<code>p.targetElement<\/code>\u3060\u3051\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u3001[0]\u3092\u30012\u756a\u76ee\u306e<code>p.targetElement<\/code>\u306b\u3092\u6307\u5b9a\u3057\u305f\u3044\u5834\u5408\u306f[1]\u3092\u4ed8\u3051\u306a\u3044\u3068\u3044\u3051\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"querryselectorall-3-2.js\" data-lang=\"JavaScript\"><code>let ansestor = document.getElementsByClassName(&#39;level0&#39;)[0];\nlet targets = ansestor.querySelectorAll(&#39;.targetElement&#39;);\n\nconsole.log(&#39;1:&#39;+ targets[0]); \/\/ \u5148\u982d\u306e\u8981\u7d20\nconsole.log(&#39;2:&#39;+ targets[1]); \/\/ 2\u756a\u76ee\u306e\u8981\u7d20<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u304c\u3001\u5384\u4ecb\u306a\u3053\u3068\u306b\u8a72\u5f53\u3059\u308b\u30a8\u30ec\u30e1\u30f3\u30c8\u304c10\u500b\u3042\u3063\u305f\u308a\u3059\u308b\u3068\u76ee\u8996\u3067[8]\u3068\u304b\u5165\u308c\u3066\u3044\u304f\u306e\u306f\u975e\u52b9\u7387\u3067\u3059\u3002\u305d\u3053\u3067\u30eb\u30fc\u30d7\u306e\u51fa\u756a\u3067\u3059\u3002\u3067\u306f\u30b5\u30f3\u30d7\u30eb\u3092\u3082\u3068\u306b\u30011\u756a\u76ee\u306e<code>p.targetElement<\/code>\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%9B%B4%E8%BF%91%E3%81%AE%E5%AD%90%E5%AD%AB%E3%80%8C%E3%81%9F%E3%81%A1%E3%80%8D%E3%81%AE1%E3%81%A4%E3%81%AB%E3%82%AF%E3%83%A9%E3%82%B9%E5%90%8D%E3%82%92%E4%BB%98%E4%B8%8E%E3%81%97%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\"><\/span>\u76f4\u8fd1\u306e\u5b50\u5b6b\u300c\u305f\u3061\u300d\u306e1\u3064\u306b\u30af\u30e9\u30b9\u540d\u3092\u4ed8\u4e0e\u3057\u305f\u3044\u5834\u5408<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-file=\"querryselectorall-fin.html\" data-lang=\"HTML\"><code>&lt;div class=&quot;level0&quot;&gt;\n  &lt;div class=&quot;level-1&quot;&gt;\n    &lt;ul class=&quot;level-2&quot;&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p class=&quot;targetElement&quot;&gt;&lt;\/p&gt;&lt;\/li&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p class=&quot;targetElement&quot;&gt;&lt;\/p&gt;&lt;\/li&gt;\n    &lt;\/ul&gt;\n  &lt;\/div&gt;\n&lt;\/div&gt;\n\n&lt;script&gt;\nlet ansestor = document.getElementsByClassName(&#39;level0&#39;)[0];\nlet targets = ansestor.querySelectorAll(&#39;.targetElement&#39;);\n\ntargets.forEach(function(elem, index){ \/\/ \u30eb\u30fc\u30d7\u51e6\u7406\u3002forEach\u3067\u3059\u3002each()\u3058\u3083\u306a\u3044\u3067\u3059\u3002\n  if(index == 0){\n    elem.classList.add(&#39;newClass&#39;);  \/\/ addClass()\u3068\u3057\u306a\u3044\u3088\u3046\u306bjQuery\u3067\u306f\u306a\u3044\u306e\u3067\u3002\n  } else {}\n});\n&lt;\/script&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u70b9\u306f2\u3064\u3042\u308a\u307e\u3059\u3002\u30eb\u30fc\u30d7\u306b\u306f<code>forEach()<\/code>\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u304c\u3001<code>each()<\/code>\u306f<code>jQuery<\/code>\u306a\u306e\u3067\u4f7f\u3048\u307e\u305b\u3093\u3002\u3082\u3057\u304f\u306f<code>for()<\/code>\u3092\u4f7f\u3063\u3066\u3082\u826f\u3044\u3067\u3059\u3002<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-foreach\/\">forEach()\u306b\u95a2\u3057\u3066\u306e\u8a18\u4e8b<\/a>\u3001<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/jquery-each\/\">each()\u306b\u95a2\u3057\u3066\u306e\u8a18\u4e8b<\/a>\u3082\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3046\u4e00\u3064\u306fjQuery\u3067\u983b\u51fa\u306e<code>addClass()<\/code>\u3082\u4f7f\u3048\u307e\u305b\u3093\u306e\u3067\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%AD%90%E5%AD%AB%E8%A6%81%E7%B4%A0%E3%81%AB%E7%89%B9%E5%AE%9A%E3%81%AE%E8%A6%81%E7%B4%A0%E3%81%8C%E5%AD%98%E5%9C%A8%E3%81%99%E3%82%8B%E3%81%8B%E5%88%A4%E5%88%A5%E3%81%99%E3%82%8B%E5%A0%B4%E5%90%88\"><\/span>\u5b50\u5b6b\u8981\u7d20\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5225\u3059\u308b\u5834\u5408<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-file=\"querryselectorall-fin2.html\" data-lang=\"HTML\"><code>&lt;div class=&quot;level0&quot;&gt;\n  &lt;div class=&quot;level-1&quot;&gt;\n    &lt;ul class=&quot;level-2&quot;&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p&gt;&lt;\/p&gt;&lt;\/li&gt;\n      &lt;li class=&quot;level-3&quot;&gt;&lt;p class=&quot;targetElement&quot;&gt;&lt;\/p&gt;&lt;\/li&gt;\n    &lt;\/ul&gt;\n  &lt;\/div&gt;\n&lt;\/div&gt;\n\n&lt;script&gt;\nlet ansestor = document.getElementsByClassName(&#39;level0&#39;)[0];\nlet targets = ansestor.querySelectorAll(&#39;.targetElement&#39;);\n\nif(targets.length == 0){\n  \/\/ \u3053\u3053\u306b\u8a72\u5f53\u304c\u306a\u3044\u6642\u306e\u51e6\u7406\n} else {\n  \/\/ \u3053\u3053\u306b\u8a72\u5f53\u304c\u3042\u308b\u5834\u5408\u306e\u51e6\u7406\n}\n&lt;\/script&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4fbf\u5b9c\u7684\u306b<code>p.targetElement<\/code>\u30921\u3064\u306b\u623b\u3057\u307e\u3057\u305f\u3002\u5b50\u5b6b\u8981\u7d20\u306b<code>p.targetElement<\/code>\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u306f\u3001<code>targets.length<\/code>\u304c0\u304b\u305d\u3046\u3067\u306a\u3044\u304b\u3067\u5206\u3051\u308b\u306e\u304c\u30d9\u30bf\u30fc\u3067\u3057\u3087\u3046\u3002<code>querySelectorAll()<\/code>\u3067\u53d6\u5f97\u3057\u305f\u8981\u7d20\u306f\u914d\u5217\u306b\u5165\u3063\u3066\u8fd4\u3055\u308c\u308b\u306e\u3067\u3001\u305d\u306e\u914d\u5217\u304c\u7a7a\u304b\u7a7a\u3067\u306a\u3044\u304b\u3067\u5224\u5225\u3059\u308b\u3068\u3088\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"querySelectorAll%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6%E3%81%AE%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>querySelectorAll()\u306b\u3064\u3044\u3066\u306e\u307e\u3068\u3081<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u7956\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308bclosest()\u3068\u306f\u53cd\u5bfe\u306bquerySelectorAll()\u306f\u5b50\u5b6b\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">querySelector()\u3084querySelectorAll()\u3067\u53d6\u5f97\u3059\u308b\u3053\u3068\u3067DOM\u64cd\u4f5c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5224\u5225\u306fquerySelectorAll()\u3067\u8fd4\u3063\u3066\u304d\u305f\u914d\u5217\u306e\u4e2d\u8eab\u304c\u7a7a\u304b\u3069\u3046\u304b\u3067\u884c\u3046\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u5168\u7136\u96e3\u3057\u3044\u3053\u3068\u306f\u306a\u3044\u306e\u30672,3\u5ea6\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u7406\u89e3\u3067\u304d\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5148\u7956\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308bclosest()\u30e1\u30bd\u30c3\u30c9\u3068\u306f\u53cd\u5bfe\u306b\u3001\u5b50\u5b6b\u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u4f55\u3067\u3057\u3087\u3046\u304b\uff1f\u300c\u305d\u308c\u306ffind()\u30e1\u30bd\u30c3\u30c9\u300d\u3067\u3059\u3001\u3068\u66f8\u3044\u3066\u3042\u308b\u30b5\u30a4\u30c8\u306f\u3059\u3050\u3055\u307e\u8aad\u3080\u306e\u3092\u6b62\u3081\u307e\u3057\u3087\u3046\u3002 2\uff0c3\u6b69\u8b72\u6b69\u3059\u308c\u3070\u5b8c\u5168\u306b\u9593\u9055\u3063\u3066\u306f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4334,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","_themeisle_gutenberg_block_has_review":false,"sitemap_hide":"","_veu_custom_css":"","veu_display_promotion_alert":"","vkexunit_cta_each_option":"","footnotes":""},"categories":[55],"tags":[8,48,90],"class_list":["post-4281","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-javascript","tag-48","tag-jquery"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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