{"id":6446,"date":"2026-04-14T12:00:19","date_gmt":"2026-04-14T03:00:19","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/?post_type=route&#038;p=6446"},"modified":"2026-10-14T12:00:27","modified_gmt":"2026-10-14T03:00:27","slug":"chartjs-responsive-canvas-size","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/6446\/","title":{"rendered":"Chart.js\u3067\u30b0\u30e9\u30d5\u30b5\u30a4\u30ba\u304c\u5408\u308f\u306a\u3044\u3068\u304d\u306e\u76f4\u3057\u65b9"},"content":{"rendered":"<p>Chart.js\u3067\u30b0\u30e9\u30d5\u306e\u9ad8\u3055\u304c\u5909\u308f\u3089\u306a\u3044\u3001\u89aa\u8981\u7d20\u304b\u3089\u306f\u307f\u51fa\u3059\u5834\u5408\u306f\u3001canvas\u81ea\u4f53\u306b\u76f8\u5bfe\u30b5\u30a4\u30ba\u3092\u76f4\u63a5\u6301\u305f\u305b\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u5c02\u7528\u306e\u89aa\u30b3\u30f3\u30c6\u30ca\u3067\u5e45\u30fb\u9ad8\u3055\u3092\u7ba1\u7406\u3059\u308b\u306e\u304c\u57fa\u672c\u3067\u3059\u3002Chart.js\u306f\u89aa\u30b3\u30f3\u30c6\u30ca\u306e\u30b5\u30a4\u30ba\u5909\u5316\u3092\u898b\u3066canvas\u3092\u30ea\u30b5\u30a4\u30ba\u3057\u307e\u3059\u3002\u9ad8\u3055\u3092\u30b3\u30f3\u30c6\u30ca\u306b\u5408\u308f\u305b\u3066\u81ea\u7531\u306b\u5909\u3048\u305f\u3044\u5834\u5408\u306f\u3001options\u3067responsive:true\u306b\u52a0\u3048\u3066maintainAspectRatio:false\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h2>\u307e\u305a\u5c02\u7528\u30b3\u30f3\u30c6\u30ca\u3067\u30b5\u30a4\u30ba\u3092\u7ba1\u7406\u3059\u308b<\/h2>\n<p>Chart.js\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u306f\u3001canvas\u306e\u63cf\u753b\u30b5\u30a4\u30ba\u3068CSS\u4e0a\u306e\u8868\u793a\u30b5\u30a4\u30ba\u306f\u5225\u7269\u3067\u3042\u308a\u3001canvas\u3078\u76f8\u5bfe\u7684\u306a\u9ad8\u3055\u30fb\u5e45\u3092\u76f4\u63a5\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u306f\u671f\u5f85\u3069\u304a\u308a\u306e\u30ea\u30b5\u30a4\u30ba\u306b\u306a\u3089\u306a\u3044\u5834\u5408\u304c\u3042\u308b\u3068\u8aac\u660e\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30b0\u30e9\u30d5\u5c02\u7528\u306e\u89aa\u8981\u7d20\u3092\u7528\u610f\u3057\u3001\u305d\u306e\u8981\u7d20\u306e\u30b5\u30a4\u30ba\u3092CSS\u3067\u6c7a\u3081\u307e\u3059\u3002<\/p>\n<pre><code>.chart-container {\r\n  position: relative;\r\n  width: 100%;\r\n  height: 320px;\r\n}\r\n\r\n.chart-container canvas {\r\n  display: block;\r\n}<\/code><\/pre>\n<pre><code>const config = {\r\n  type: &#39;line&#39;,\r\n  data,\r\n  options: {\r\n    responsive: true,\r\n    maintainAspectRatio: false\r\n  }\r\n};\r\n\r\nnew Chart(document.getElementById(&#39;salesChart&#39;), config);<\/code><\/pre>\n<p>HTML\u5074\u3067\u306fchart-container\u306e\u4e2d\u306bcanvas\u30921\u3064\u7f6e\u304d\u307e\u3059\u3002\u30b5\u30a4\u30ba\u5909\u66f4\u306fcanvas\u306e\u5c5e\u6027\u3067\u306f\u306a\u304f\u3001\u307e\u305a\u30b3\u30f3\u30c6\u30ca\u5074\u3092\u8abf\u6574\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<hr>\n<h2>responsive\u3068maintainAspectRatio\u306e\u5f79\u5272<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u8a2d\u5b9a<\/th>\n<th>\u5f79\u5272<\/th>\n<th>\u3088\u304f\u4f7f\u3046\u5834\u9762<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>responsive: true<\/td>\n<td>\u89aa\u30b3\u30f3\u30c6\u30ca\u306e\u30b5\u30a4\u30ba\u5909\u5316\u306b\u5408\u308f\u305b\u3066canvas\u3092\u30ea\u30b5\u30a4\u30ba<\/td>\n<td>\u901a\u5e38\u306e\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u8868\u793a<\/td>\n<\/tr>\n<tr>\n<td>maintainAspectRatio: true<\/td>\n<td>\u5143\u306e\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3092\u4fdd\u3064<\/td>\n<td>\u7e26\u6a2a\u6bd4\u3092\u56fa\u5b9a\u3057\u305f\u3044<\/td>\n<\/tr>\n<tr>\n<td>maintainAspectRatio: false<\/td>\n<td>\u89aa\u30b3\u30f3\u30c6\u30ca\u306e\u9ad8\u3055\u306b\u8ffd\u5f93\u3057\u3084\u3059\u304f\u3059\u308b<\/td>\n<td>\u9ad8\u3055\u3092CSS\u3067\u81ea\u7531\u306b\u6c7a\u3081\u305f\u3044<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>responsive\u306fChart.js\u306e\u65e2\u5b9a\u5024\u304ctrue\u3001maintainAspectRatio\u3082\u65e2\u5b9a\u5024\u304ctrue\u3067\u3059\u3002\u6a2a\u5e45\u306f\u5909\u308f\u308b\u306e\u306b\u9ad8\u3055\u304c\u671f\u5f85\u3069\u304a\u308a\u5909\u308f\u3089\u306a\u3044\u5834\u5408\u306f\u3001\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3092\u7dad\u6301\u3059\u308b\u8a2d\u5b9a\u304c\u52b9\u3044\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<blockquote>\n<p><strong>\u7528\u8a9e\u89e3\u8aac\uff1a\u30a2\u30b9\u30da\u30af\u30c8\u6bd4<\/strong><br \/>\u5e45\u3068\u9ad8\u3055\u306e\u6bd4\u7387\u3067\u3059\u3002maintainAspectRatio\u304ctrue\u306e\u3068\u304d\u3001Chart.js\u306f\u30ea\u30b5\u30a4\u30ba\u6642\u306b\u3053\u306e\u6bd4\u7387\u3092\u7dad\u6301\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002<\/p>\n<\/blockquote>\n<hr>\n<h2>\u9ad8\u3055\u3092\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5408\u308f\u305b\u305f\u3044\u5834\u5408<\/h2>\n<p>\u56fa\u5b9apx\u3067\u306f\u306a\u304f\u753b\u9762\u9ad8\u306b\u5fdc\u3058\u3066\u5909\u3048\u305f\u3044\u5834\u5408\u3082\u3001canvas\u3067\u306f\u306a\u304f\u89aa\u30b3\u30f3\u30c6\u30ca\u3078\u76f8\u5bfe\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<pre><code>.chart-container {\r\n  position: relative;\r\n  width: 100%;\r\n  height: 40vh;\r\n  min-height: 240px;\r\n  max-height: 520px;\r\n}<\/code><\/pre>\n<p>\u3053\u306e\u3068\u304d\u3082maintainAspectRatio:false\u304c\u5fc5\u8981\u3067\u3059\u3002\u30b3\u30f3\u30c6\u30ca\u304c\u5c02\u7528\u3067relative positioning\u3092\u6301\u3064\u3053\u3068\u3082\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<hr>\n<h2>\u307c\u3084\u3051\u308b\u30fb\u7e2e\u307f\u7d9a\u3051\u308b\u3068\u304d\u306b\u78ba\u8a8d\u3059\u308b<\/h2>\n<ul>\n<li>canvas\u3078CSS\u306e\u76f8\u5bfe\u30b5\u30a4\u30ba\u3092\u76f4\u63a5\u6307\u5b9a\u3057\u3066\u3044\u306a\u3044\u304b<\/li>\n<li>canvas\u3068\u89aa\u30b3\u30f3\u30c6\u30ca\u306e\u4e21\u65b9\u3067\u7af6\u5408\u3059\u308b\u9ad8\u3055\u6307\u5b9a\u3092\u3057\u3066\u3044\u306a\u3044\u304b<\/li>\n<li>\u30b0\u30e9\u30d5\u5c02\u7528\u30b3\u30f3\u30c6\u30ca\u304cposition: relative\u306b\u306a\u3063\u3066\u3044\u308b\u304b<\/li>\n<li>maintainAspectRatio:true\u306e\u307e\u307e\u9ad8\u3055\u3060\u3051\u3092\u5909\u66f4\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u306a\u3044\u304b<\/li>\n<li>\u89aa\u30b3\u30f3\u30c6\u30ca\u81ea\u4f53\u306e\u5e45\u30fb\u9ad8\u3055\u304c\u30ec\u30a4\u30a2\u30a6\u30c8\u4e0a0\u3084\u6975\u7aef\u306a\u5024\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b<\/li>\n<\/ul>\n<p>Chart.js\u306e\u554f\u984c\u306b\u898b\u3048\u3066\u3082\u3001\u89aa\u8981\u7d20\u306eFlexbox\u3084Grid\u8a2d\u5b9a\u3067\u9ad8\u3055\u304c\u6c7a\u307e\u3063\u3066\u3044\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u958b\u767a\u8005\u30c4\u30fc\u30eb\u3067chart-container\u306e\u5b9f\u969b\u306ewidth\u3068height\u3092\u5148\u306b\u78ba\u8a8d\u3059\u308b\u3068\u5207\u308a\u5206\u3051\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>JavaScript\u304b\u3089\u30b5\u30a4\u30ba\u3092\u5909\u3048\u308b\u5834\u5408<\/h2>\n<p>\u30e2\u30fc\u30c0\u30eb\u3084\u30c0\u30c3\u30b7\u30e5\u30dc\u30fc\u30c9\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u5909\u66f4\u306a\u3069\u3001\u5b9f\u884c\u6642\u306b\u89aa\u30b3\u30f3\u30c6\u30ca\u306e\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u5909\u66f4\u5f8c\u306bChart.js\u306eresize\u3092\u4f7f\u3046\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre><code>const container = chart.canvas.parentNode;\r\ncontainer.classList.add(&#39;chart-container--compact&#39;);\r\nchart.resize();<\/code><\/pre>\n<p>\u305f\u3060\u3057CSS\u3060\u3051\u3067\u89aa\u30b3\u30f3\u30c6\u30ca\u304c\u81ea\u7136\u306b\u30ea\u30b5\u30a4\u30ba\u3055\u308c\u3001Chart.js\u304c\u5909\u66f4\u3092\u691c\u77e5\u3067\u304d\u308b\u69cb\u6210\u306a\u3089\u3001\u6bce\u56de\u624b\u52d5\u3067resize\u3092\u547c\u3076\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u307e\u305a\u30ec\u30a4\u30a2\u30a6\u30c8\u5074\u3092\u5b89\u5b9a\u3055\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2>\u95a2\u9023\u3059\u308bChart.js\u30fb\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u8a2d\u8a08<\/h2>\n<p>Chart.js\u81ea\u4f53\u306e\u57fa\u672c\u7684\u306a\u63cf\u753b\u65b9\u6cd5\u306f\u5165\u9580\u8a18\u4e8b\u3001\u53e4\u3044\u63cf\u753b\u304c\u6b8b\u308b\u554f\u984c\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u7ba1\u7406\u306e\u8a18\u4e8b\u3001\u30da\u30fc\u30b8\u5168\u4f53\u306e\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u8a2d\u8a08\u306fCSS\u306e\u8a18\u4e8b\u304c\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<p>\uff08Chart.js\u306e\u57fa\u672c\u7684\u306a\u30b0\u30e9\u30d5\u63cf\u753b\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1031\/\">Chart.js\u3067\u30b0\u30e9\u30d5\u3092\u4f5c\u6210\uff01HTML\u306b\u8cbc\u308b\u3060\u3051\u3067\u52d5\u304f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u96c6<\/a>\u300f\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n<p>\uff08\u63cf\u753b\u304c\u6b8b\u308b\u30fb\u91cd\u306a\u308b\u554f\u984c\u3092\u76f4\u3059\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1496\/\">Chart.js\u3067\u63cf\u753b\u304c\u6b8b\u308b\u554f\u984c\u30923\u5206\u3067\u5373\u89e3\u6c7a\uff01\u539f\u56e0\u3068\u5bfe\u51e6<\/a>\u300f\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n<p>\uff08CSS\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u306e\u57fa\u790e\u3092\u78ba\u8a8d\u3059\u308b\u306b\u3064\u3044\u3066\u306f\u300e<a 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