{"id":117963,"date":"2024-03-23T12:27:56","date_gmt":"2024-03-23T03:27:56","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/html-select%e3%81%aeselectedindex%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%81%af%e4%bd%95%e3%82%92%e3%81%99%e3%82%8b%ef%bc%9f\/"},"modified":"2024-04-04T10:40:59","modified_gmt":"2024-04-04T01:40:59","slug":"html-select%e3%81%aeselectedindex%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%81%af%e4%bd%95%e3%82%92%e3%81%99%e3%82%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/html-select%e3%81%aeselectedindex%e3%83%97%e3%83%ad%e3%83%91%e3%83%86%e3%82%a3%e3%81%af%e4%bd%95%e3%82%92%e3%81%99%e3%82%8b%ef%bc%9f\/","title":{"rendered":"HTML Select\u306eselectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4f55\u3092\u3059\u308b\uff1f"},"content":{"rendered":"

HTML Select\u8981\u7d20\u306eselectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u305d\u306e\u8981\u7d20\u306e\u4e2d\u3067\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u53d6\u5f97\u307e\u305f\u306f\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u78ba\u8a8d\u3057\u305f\u308a\u3001\u7279\u5b9a\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u9078\u629e\u72b6\u614b\u306b\u8a2d\u5b9a\u3057\u305f\u308a\u3059\u308b\u306e\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n

selectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u4f7f\u7528\u4f8b\uff1a<\/p>\n

    \n
  1. \u9078\u629e\u3057\u305f\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f:<\/li>\n<\/ol>\n
    const<\/span> select = document<\/span>.getElementById<\/span>(\"mySelect\"<\/span>);\r\nconst<\/span> selectedIndex = select.selectedIndex<\/span>;\r\nconsole<\/span>.log<\/span>(selectedIndex);  \/\/ \u8f93\u51fa\u88ab\u9009\u4e2d\u9009\u9879\u7684\u7d22\u5f15<\/span>\r\n<\/code><\/pre>\n
      \n
    1. \u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u30aa\u30f3\u306b\u3059\u308b\uff1a<\/li>\n<\/ol>\n
      const<\/span> select = document<\/span>.getElementById<\/span>(\"mySelect\"<\/span>);\r\nselect.selectedIndex<\/span> = 2<\/span>;  \/\/ \u5c06\u7d22\u5f15\u4e3a2\u7684\u9009\u9879\u8bbe\u7f6e\u4e3a\u88ab\u9009\u4e2d\u72b6\u6001<\/span>\r\n<\/code><\/pre>\n
      \u9078\u629e\u53ef\u80fd\u306a\u9805\u76ee\u306e\u7bc4\u56f2\u3092\u8d85\u3048\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u3001selectedIndex \u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u8a2d\u5b9a\u306f\u7121\u52b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
        \n
      1. selectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066select\u8981\u7d20\u5185\u306e\u9078\u629e\u3055\u308c\u305f\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u53d6\u5f97\u307e\u305f\u306f\u8a2d\u5b9a\u3057\u307e\u3059\uff1a<\/li>\n<\/ol>\n
        const<\/span> select = document<\/span>.getElementById<\/span>(\"mySelect\"<\/span>);\r\nconst<\/span> selectedValue = select.options<\/span>[select.selectedIndex<\/span>].value<\/span>;  \/\/ \u83b7\u53d6\u88ab\u9009\u4e2d\u9009\u9879\u7684\u503c<\/span>\r\nconsole<\/span>.log<\/span>(selectedValue);  \/\/ \u8f93\u51fa\u88ab\u9009\u4e2d\u9009\u9879\u7684\u503c<\/span>\r\n<\/code><\/pre>\n
        HTML Select \u8981\u7d20\u306e selectedIndex \u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u9078\u629e\u3055\u308c\u305f\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u53d6\u5f97\u3057\u305f\u308a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6307\u5b9a\u3057\u3066\u7279\u5b9a\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u9078\u629e\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        HTML Select\u8981\u7d20\u306eselectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u305d\u306e\u8981\u7d20\u306e\u4e2d\u3067\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u53d6\u5f97\u307e\u305f\u306f\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u78ba\u8a8d\u3057\u305f\u308a\u3001\u7279\u5b9a\u306e\u30aa […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-117963","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHTML Select\u306eselectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4f55\u3092\u3059\u308b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/html-select\u306eselectedindex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4f55\u3092\u3059\u308b\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HTML Select\u306eselectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4f55\u3092\u3059\u308b\uff1f\" \/>\n<meta property=\"og:description\" content=\"HTML Select\u8981\u7d20\u306eselectedIndex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001\u305d\u306e\u8981\u7d20\u306e\u4e2d\u3067\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u53d6\u5f97\u307e\u305f\u306f\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u78ba\u8a8d\u3057\u305f\u308a\u3001\u7279\u5b9a\u306e\u30aa […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/html-select\u306eselectedindex\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4f55\u3092\u3059\u308b\uff1f\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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