{"id":4223,"date":"2023-03-22T16:28:59","date_gmt":"2023-03-22T07:28:59","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=4223"},"modified":"2023-03-23T02:11:27","modified_gmt":"2023-03-22T17:11:27","slug":"javascript-closest-ancestordom","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closest-ancestordom\/","title":{"rendered":"JavaScript\u3067\u5148\u7956\u8981\u7d20\u306e\u53d6\u5f97\u3084\u64cd\u4f5c\u3001\u6709\u7121\u3092\u5224\u5225\u3059\u308b\u65b9\u6cd5\u3092\u521d\u5fc3\u8005\u306b\u3082\u5206\u304b\u308b\u3088\u3046\u306b\u89e3\u8aac\u3010closest()\u30e1\u30bd\u30c3\u30c9\u3011"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87_1 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-closest-ancestordom\/#closest%E3%83%A1%E3%82%BD%E3%83%83%E3%83%89%E3%81%AE%E4%BD%BF%E3%81%84%E6%96%B9\" >closest()\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/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-closest-ancestordom\/#closest%E3%81%A7%E5%8F%96%E5%BE%97%E3%81%97%E3%81%9F%E8%A6%81%E7%B4%A0%E3%81%AB%E3%82%AF%E3%83%A9%E3%82%B9%E3%82%92%E4%BB%98%E3%81%91%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\" >closest()\u3067\u53d6\u5f97\u3057\u305f\u8981\u7d20\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u3051\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-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closest-ancestordom\/#closest%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E5%85%88%E7%A5%96%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%97%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\" >closest()\u3092\u4f7f\u3063\u3066\u5148\u7956\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5225\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-closest-ancestordom\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">JavaScript\u3067\u81ea\u8eab\u306e\u8981\u7d20\u3088\u308a\u3082\u4e0a\u306e\u968e\u5c64\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3057\u305f\u308a\u3001\u305d\u306e\u8981\u7d20\u3092\u6307\u5b9a\u3057\u3066DOM\u64cd\u4f5c\u3059\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u306f<code>closest()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"closest%E3%83%A1%E3%82%BD%E3%83%83%E3%83%89%E3%81%AE%E4%BD%BF%E3%81%84%E6%96%B9\"><\/span>closest()\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DOM\u69cb\u9020\u306b\u304a\u3044\u3066\u6307\u5b9a\u306e\u8981\u7d20\u3088\u308a\u3082\u89aa\u8981\u7d20\u3088\u308a\u3082\u4e0a\u306e\u968e\u5c64\u306b\u3042\u308b\u30a8\u30ec\u30e1\u30f3\u30c8\u3092\u300c\u5148\u7956\u8981\u7d20\u300d\u3068\u3044\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306aHTML\u69cb\u9020\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-html\" data-file=\"closest.html\" data-lang=\"HTML\"><code>&lt;div class=&quot;level3&quot;&gt;\n  &lt;div class=&quot;level2&quot;&gt;\n    &lt;div class=&quot;level1&quot;&gt;\n      &lt;p class=&quot;level0&quot;&gt;\u3053\u3053\u306e\u8981\u7d20&lt;\/p&gt;\n    &lt;\/div&gt;\n  &lt;\/div&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u5834\u5408\u3001<code>&lt;p&gt;<\/code>\u306e\u89aa\u8981\u7d20\u306f<code>&lt;div class=\"level1\"&gt;<\/code>\u306b\u306a\u308a\u5148\u7956\u8981\u7d20\u306f<code>&lt;div class=\"level2\"&gt;<\/code>\u3068<code>&lt;div class=\"level3\"&gt;<\/code>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e<code>p.level0<\/code>\u3092\u57fa\u6e96\u3068\u3057\u3066\u3001\u305d\u306e\u4e0a\u306e\u968e\u5c64\u306b\u3042\u308b<code>div.level3<\/code>\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306b\u306f\u6b21\u306e\u3088\u3046\u306b<code>closest()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"level3\">\n  <div class=\"level2\">\n    <div class=\"level1\">\n      <p class=\"level0\"><\/p>\n    <\/div>\n  <\/div>\n<\/div>\n<script>\n\/\/window.addEventListener('DOMContentLoaded', (event) => {\n  let ancestorDOM = document.getElementsByClassName('level0')[0].closest('.level4');\n  console.log(ancestorDOM);\n  if(ancestorDOM == null){\n    console.log('\u5b58\u5728\u3057\u307e\u305b\u3093');\n  } else {\n    ancestorDOM.classList.add(\"newClass\");\n    console.log('\u3042\u308a\u307e\u3059');\n  }\n\/\/});\n<\/script>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"closest-class.js\" data-lang=\"JavaScript\"><code>let ancestorDOM = document.getElementsByClassName(&#39;level0&#39;)[0].closest(&#39;.level3&#39;);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u3067\u6ce8\u610f\u3059\u3079\u304d\u70b9\u304c\uff12\u3064\u3042\u308a\u307e\u3059\u3002<br>\uff11\u3064\u306f\u3001<code>getElementsByClassName<\/code>\u306fclass\u540d\u304clevel0\u306e\u8981\u7d20\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\u306e\u3067<code>[0]<\/code>\u306e\u3088\u3046\u306b\u4f55\u756a\u76ee\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\uff080\u306f\u5148\u982d\u3092\u793a\u3057\u307e\u3059\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>getElementById<\/code>\u3067\u6307\u5b9a\u3059\u308b\u5834\u5408\u306b\u306f\u3001\u539f\u5247\u3068\u3057\u3066<code>id<\/code>\u306f\u30da\u30fc\u30b8\u5185\u306b\uff11\u3064\u3057\u304b\u306a\u3044\u306f\u305a\u3067\u3059\u306e\u3067\u5358\u7d14\u306b<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"closest_id.js\" data-lang=\"JavaScript\"><code>document.getElementsById(&#39;anyID&#39;).closest(&#39;.level3&#39;);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u306e\u3088\u3046\u306b\u306a\u308a\u3001<code>[0]<\/code>\u306f\u4e0d\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3046\uff11\u3064\u306f\u3001closest(\u30bb\u30ec\u30af\u30bf) \u3067\u6307\u5b9a\u3059\u308b\u30bb\u30ec\u30af\u30bf\u306f\u300c\u30bb\u30ec\u30af\u30bf\u300d\u306a\u306e\u3067class\u306e\u5834\u5408\u306f\u300c<code>.<\/code>\u300did\u306e\u5834\u5408\u306f\u300c<code>#<\/code>\u300d\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u6c17\u3092\u4ed8\u3051\u3066\u4e0b\u3055\u3044\u3002\u3082\u3057\u5358\u306b<code>&lt;div&gt;<\/code>\u3067\u3042\u308c\u3070<code>closest('div')<\/code>\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"closest%E3%81%A7%E5%8F%96%E5%BE%97%E3%81%97%E3%81%9F%E8%A6%81%E7%B4%A0%E3%81%AB%E3%82%AF%E3%83%A9%E3%82%B9%E3%82%92%E4%BB%98%E3%81%91%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\"><\/span>closest()\u3067\u53d6\u5f97\u3057\u305f\u8981\u7d20\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u3051\u305f\u3044\u5834\u5408<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u304d\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u53d6\u5f97\u3057\u305f\u30a8\u30ec\u30e1\u30f3\u30c8\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u3051\u305f\u3044\u3068\u304d\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"closest_addclass.js\" data-lang=\"JavaScript\"><code>let ancestorDOM = document.getElementsByClassName(&#39;level0&#39;)[0].closest(&#39;.level3&#39;);\nancestorDOM.classList.add(&#39;newClass&#39;);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">jQuery\u3067\u306f.addClass()\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u30d7\u30ec\u30fc\u30f3\u306aJavaScript\u3067\u306f<code>.classList.add('\u30af\u30e9\u30b9\u540d')<\/code>\u306e\u3088\u3046\u306b\u3057\u3066\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"closest%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E5%85%88%E7%A5%96%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%97%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\"><\/span>closest()\u3092\u4f7f\u3063\u3066\u5148\u7956\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b\u5224\u5225\u3057\u305f\u3044\u5834\u5408<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u5b9a\u306e\u8981\u7d20\u306b\u5148\u7956\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3059\u308b\u3068\u304d\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plain\"><code>let ancestorDOM = document.getElementsByClassName(&#39;level0&#39;)[0].closest(&#39;.notExist&#39;);\nif(ancestorDOM == null){\n  \/\/ \u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306e\u51e6\u7406\n} else {\n  \/\/ \u5b58\u5728\u3059\u308b\u5834\u5408\u306e\u51e6\u7406\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">closest()\u30e1\u30bd\u30c3\u30c9\u306f\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306fnull\u3092\u8fd4\u3059\u306e\u3067\u3001null\u304b\u3069\u3046\u304b\u3067\u5224\u5225\u3059\u308b\u3068\u30b9\u30de\u30fc\u30c8\u3067\u3059\u306d\u3002<br>(\u53c2\u8003\uff1a<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Element\/closest#%E8%BF%94%E5%80%A4\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Element\/closest#%E8%BF%94%E5%80%A4<\/a>)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>\u307e\u3068\u3081<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070\u300c\u6307\u5b9a\u306e\u8981\u7d20\u306e\u5148\u7956\u306blevel3\u3068\u3044\u3046\u30af\u30e9\u30b9\u306e\u8981\u7d20\u304c\u3042\u308c\u3070\u3001newClass\u3068\u3044\u3046\u30af\u30e9\u30b9\u3092\u305d\u3053\u306b\u4ed8\u4e0e\u3057\u305f\u3044\u300d\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"closest_ifexsit_addclass.js\" data-lang=\"JavaScript\"><code>let ancestorDOM = document.getElementsByClassName(&#39;level0&#39;)[0].closest(&#39;.level3&#39;);\n\nif(ancestorDOM == null){ \n  \/\/ \u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306e\u51e6\u7406\n} else {\n  \/\/ \u5b58\u5728\u3059\u308b\u5834\u5408\u306e\u51e6\u7406\n  ancestorDOM.classList.add(&quot;newClass&quot;);\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u305a\u3063\u3068\u7c21\u5358\u306b<code>closest()<\/code>\u30e1\u30bd\u30c3\u30c9\u304c\u4f7f\u3048\u307e\u3059\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u3067\u81ea\u8eab\u306e\u8981\u7d20\u3088\u308a\u3082\u4e0a\u306e\u968e\u5c64\u306b\u7279\u5b9a\u306e\u8981\u7d20\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5225\u3057\u305f\u308a\u3001\u305d\u306e\u8981\u7d20\u3092\u6307\u5b9a\u3057\u3066DOM\u64cd\u4f5c\u3059\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u306fclosest()\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u306e\u304c\u4e00\u822c\u7684\u3067\u3059\u3002 close 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