{"id":3412,"date":"2021-07-26T13:29:15","date_gmt":"2021-07-26T04:29:15","guid":{"rendered":"https:\/\/taitan916.info\/blog\/?p=3412"},"modified":"2024-01-12T19:45:24","modified_gmt":"2024-01-12T10:45:24","slug":"post-3412","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/3412","title":{"rendered":"FileReader API\u3092\u7528\u3044\u3066\u753b\u50cf\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u305b\u305a\u306b\u30b5\u30e0\u30cd\u30a4\u30eb\u8868\u793a"},"content":{"rendered":"

\u4ee5\u524d\u306bFile API\u3092\u7528\u3044\u3066\u30d5\u30a1\u30a4\u30eb\u540d\u3084\u30b5\u30a4\u30ba\u3001\u5f62\u5f0f(\u62e1\u5f35\u5b50)\u3092\u53d6\u5f97\u3059\u308b\u30e1\u30e2<\/a>\u3092\u66f8\u3044\u305f\u304c\u3001\u3053\u306e\u5fdc\u7528\u3067\u753b\u50cf\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u305b\u305a\u306b\u30b5\u30e0\u30cd\u30a4\u30eb\u8868\u793a\u3067\u304d\u308b\u3093\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3063\u305f\u3002\u8abf\u3079\u3066\u307f\u305f\u3068\u3053\u308dFileReader API\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u5bfe\u5fdc\u3067\u304d\u305f\u3002\u4ee5\u4e0b\u306b\u5b9f\u88c5\u65b9\u6cd5\u3092\u30e1\u30e2\u3002<\/p>\n

 <\/p>\n

FileReader API\u306e\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9<\/h2>\n

https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/FileReader<\/a><\/p>\n

 <\/p>\n

\u30b5\u30f3\u30d7\u30eb<\/h2>\n

https:\/\/taitan916.info\/sample\/fileapi\/index2.php<\/a><\/p>\n

\u4e0a\u8a18\u30da\u30fc\u30b8\u3067\u753b\u50cf\u3092\u9078\u629e\u3059\u308b\u3068\u30b5\u30e0\u30cd\u30a4\u30eb\u304c\u8868\u793a\u3055\u308c\u308b\u3002<\/p>\n

 <\/p>\n

\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/h2>\n
<html lang="ja">\r\n<head>\r\n<meta http-equiv="Content-Type" content="text\/html; charset=UTF-8">\r\n<title>File API\u3067\u30b5\u30e0\u30cd\u30a4\u30eb\u8868\u793a<\/title>\r\n<\/head>\r\n<style>\r\n.thumb img{\r\n\tmax-width: 150px;\r\n\tmargin-bottom: 10px;\r\n}\r\n<\/style>\r\n<body>\r\n\r\n<input type="file" name="img_1" id="img_1" class="img">\r\n<div id="thumb_1" class="thumb"><\/div>\r\n\r\n<input type="file" name="img_2" id="img_2" class="img">\r\n<div id="thumb_2" class="thumb"><\/div>\r\n\r\n<script type="text\/javascript" src="\/\/code.jquery.com\/jquery-3.5.1.js"><\/script>\r\n<script type="text\/javascript">\r\n$(function(){\r\n\t$('.img').change(function(){\r\n\r\n\t\t\/\/ID\u53d6\u5f97\r\n\t\tlet tmp_id = $(this).attr('id');\r\n\t\ttmp_id = tmp_id.split('_');\r\n\t\tconst id = tmp_id[1];\r\n\r\n\t\t\/\/\u753b\u50cf\u53d6\u5f97\r\n\t\tconst img = $('#img_' + id).prop('files')[0];\r\n\t\tconst type = img.type;\r\n\r\n\t\t\/\/\u753b\u50cf\u304b\u3069\u3046\u304b\u30c1\u30a7\u30c3\u30af\r\n\t\tif( !type.match(\/^image\/) ){\r\n\t\t\talert('\u753b\u50cf\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044');\r\n\t\t\t$(this).val('');\r\n\t\t\treturn false;\r\n\t\t}\r\n\r\n\t\t\/\/FileReader\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\r\n\t\tlet reader = new FileReader();\r\n\r\n\t\t\/\/\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\r\n\t\treader.readAsDataURL(img);\r\n\r\n\t\t\/\/\u8aad\u307f\u8fbc\u307f\u5931\u6557\u6642\r\n\t\treader.onerror = function(){\r\n\t\t\talert('\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u53d6\u308a\u306b\u5931\u6557\u3057\u307e\u3057\u305f');\r\n\t\t\t$(this).val('');\r\n\t\t\treturn false;\r\n\t\t}\r\n\r\n\t\t\/\/\u753b\u50cf\u3092\u8868\u793a\r\n\t\treader.onload = function() {\r\n\t\t\t$('#thumb_' + id).html('<img src="' + reader.result + '">')\r\n\t\t}\r\n\r\n\t});\r\n})\r\n<\/script>\r\n<\/body>\r\n<\/html><\/pre>\n
 <\/p>\n
\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6<\/h2>\n
\u4ee5\u4e0b\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9\u3092\u78ba\u8a8d\u3057\u305f\u3068\u3053\u308d\u3001\u304a\u304a\u3088\u305d\u306ePC \/ SP\u30d6\u30e9\u30a6\u30b6\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u6a21\u69d8\u3002<\/p>\n
https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/FileReader#browser_compatibility<\/a><\/p>\n
 <\/p>\n
\u6240\u611f<\/h2>\n
\u753b\u50cf\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u3053\u3068\u306a\u304f\u30b5\u30e0\u30cd\u30a4\u30eb\u8868\u793a\u3067\u304d\u308b\u306e\u306f\u975e\u5e38\u306b\u4fbf\u5229\u304b\u3082\u3057\u308c\u306a\u3044\u3002\u3055\u3089\u306b\u304a\u304a\u3088\u305d\u306e\u30d6\u30e9\u30a6\u30b6\u306b\u3082\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u3088\u3046\u306a\u306e\u3067\u5b9f\u7528\u6027\u304c\u3042\u308a\u305d\u3046\u3002<\/p>\n
 <\/p>\n
\u53c2\u8003\u30b5\u30a4\u30c8<\/h2>\n
http:\/\/tech.innovation.co.jp\/2017\/02\/25\/image-File-Reader.html<\/a><\/p>\n
https:\/\/cly7796.net\/blog\/javascript\/use-the-file-api-to-display-a-thumbnail-of-the-image-that-is-referenced-from-the-local\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u4ee5\u524d\u306bFile API\u3092\u7528\u3044\u3066\u30d5\u30a1\u30a4\u30eb\u540d\u3084\u30b5\u30a4\u30ba\u3001\u5f62\u5f0f(\u62e1\u5f35\u5b50)\u3092\u53d6\u5f97\u3059\u308b\u30e1\u30e2\u3092 ... <\/p>\n","protected":false},"author":1,"featured_media":1069,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4,9],"tags":[91],"class_list":["post-3412","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","category-html","tag-image"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/3412","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/comments?post=3412"}],"version-history":[{"count":0,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/3412\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media\/1069"}],"wp:attachment":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media?parent=3412"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/categories?post=3412"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/tags?post=3412"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}