\u30b3\u30d4\u30da\u3067OK\uff01\u30ed\u30fc\u30ab\u30eb\u74b0\u5883\u306bHTTPS\u3092\u5c0e\u5165\u3059\u308b\uff08nginx\u7de8\uff09<\/a>\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\u3067\u306f\u3001\u6b21\u306e\u9805\u76ee\u304b\u3089\u5b9f\u969b\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\uff01<\/p>\n
\u57fa\u672c\u5f62\u3092\u3064\u304f\u308b<\/h1>\n
\u307e\u305a\u306f\u57fa\u672c\u306b\u306a\u308b\u90e8\u5206\u306eHTML<\/code>\u3068JavaScript<\/code>\u3067\u3059\u3002<\/p>\n<html>\r\n<head>\r\n <link href=\"https:\/\/stackpath.bootstrapcdn.com\/bootstrap\/4.3.1\/css\/bootstrap.min.css\" rel=\"stylesheet\">\r\n<\/strong><\/head>\r\n<body>\r\n<div id=\"app\" class=\"p-3\">\r\n\r\n <!-- \u3053\u3053\u306b\u753b\u50cf\u30ea\u30b5\u30a4\u30ba\u30fb\u30b3\u30f3\u30c6\u30f3\u30c4 -->\r\n\r\n<\/div>\r\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/vue@2.6.0\"><\/script>\r\n<\/strong><script>\r\n\r\n new Vue({\r\n el: '#app',\r\n data: {\r\n imageData: null,\r\n resizingWidth: 0,\r\n resizingHeight: 0\r\n }<\/strong>\r\n });\r\n\r\n<\/script>\r\n<\/body>\r\n<\/html><\/pre>\n\u3053\u3053\u3067\u306f\u3001Vue<\/code>\u3068Bootstrap<\/code>\uff08CSS\u306e\u307f\uff09\u304c\u4f7f\u3048\u308b\u3088\u3046\u306bCDN<\/code>\u3067\u8aad\u307f\u8fbc\u307f\u3001\u3055\u3089\u306bVue<\/code>\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u5909\u6570\u3092\u7528\u610f\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n- imageData\u3000\u30fb\u30fb\u30fb\u3000\u9078\u629e\u3055\u308c\u305f\u753b\u50cf\u306e\u30c7\u30fc\u30bf\u304c\u5165\u308b<\/li>\n
- resizingWidth, resizingHeight\u3000\u30fb\u30fb\u30fb\u3000\u30ea\u30b5\u30a4\u30ba\u3059\u308b\u7e26\u6a2a\u30b5\u30a4\u30ba<\/li>\n<\/ul>\n
\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3059\u308b\u90e8\u5206\u3092\u3064\u304f\u308b<\/h1>\n
\u3067\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u74b0\u5883\u306b\u3042\u308b\u753b\u50cf\u3092\u9078\u629e\u3059\u308b\u90e8\u5206\u3092\u4f5c\u3063\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
<div id=\"app\" class=\"p-3\">\r\n <button class=\"btn btn-primary\" @click=\"chooseFile\">\u30ea\u30b5\u30a4\u30ba\u3059\u308b\u753b\u50cf\u3092\u9078\u629e<\/button><\/strong>\r\n<\/div><\/pre>\nHTML\u5074\u306b\u306f\u30dc\u30bf\u30f3\u3092\u4f5c\u308a\u3001\u30af\u30ea\u30c3\u30af\u3057\u305f\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u30e1\u30bd\u30c3\u30c9\u3092Vue<\/code>\u5074\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\nnew Vue({\r\n\r\n \/\/ \u7701\u7565\r\n\r\n computed: {\r\n imageContents() {<\/strong>\r\n\r\n if(this.imageData !== null) {<\/strong>\r\n\r\n \/\/ img \u30bf\u30b0\u304c\u8aad\u307f\u8fbc\u3081\u308b\u5f62\u5f0f\u306b\u5909\u63db<\/strong>\r\n return URL.createObjectURL(this.imageData);<\/strong>\r\n\r\n }<\/strong>\r\n\r\n }<\/strong>\r\n },\r\n methods: {\r\n async chooseFile() {<\/strong>\r\n\r\n const options = {<\/strong>\r\n accepts: [{<\/strong>\r\n mimeTypes: ['image\/png', 'image\/jpeg', 'image\/gif'] \/\/ \u753b\u50cf\u3060\u3051\u8a31\u53ef<\/strong>\r\n }],<\/strong>\r\n };<\/strong>\r\n const handle = await window.chooseFileSystemEntries(options);<\/strong>\r\n this.imageData = await handle.getFile();<\/strong>\r\n\r\n let img = new Image();<\/strong>\r\n img.onload = () => {<\/strong>\r\n\r\n \/\/ \u753b\u50cf\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97<\/strong>\r\n this.resizingWidth = img.width;<\/strong>\r\n this.resizingHeight = img.height;<\/strong>\r\n\r\n };<\/strong>\r\n img.src = this.imageContents;<\/strong>\r\n\r\n }<\/strong>\r\n }\r\n});<\/pre>\n\u307e\u305a\u3001\u3053\u306e\u4e2d\u3067\u91cd\u8981\u306a\u306e\u304ccomputed<\/code>\u306b\u3042\u308bimageContents()<\/code>\u3067\u3059\u3002<\/p>\n\u3053\u3053\u3067\u306f\u3001\u9078\u629e\u3055\u308c\u305f\u753b\u50cf\u30c7\u30fc\u30bf\u306f\u305d\u306e\u307e\u307e\u3067\u306f<img><\/code>\u30bf\u30b0\u3067\u306f\u8868\u793a\u3067\u304d\u306a\u3044\u306e\u3067\u3001URL.createObjectURL()<\/code>\u3092\u4f7f\u3063\u3066\u5909\u63db\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\u305d\u3057\u3066\u3001chooseFileSystemEntries()<\/code>\u304c\u753b\u50cf\u3092\u9078\u629e\u3059\u308b\u90e8\u5206\u3067\u3001\u3082\u3057\u9078\u629e\u3055\u308c\u305f\u3089getFile()<\/code>\u3092\u5b9f\u884c\u3057\u3001\u4e2d\u8eab\u3092\u5909\u6570imageData<\/code>\u306b\u683c\u7d0d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\u203b \u3053\u306eimageData<\/code>\u304c\u5143\u306b\u306a\u3063\u3066imageContents()<\/code>\u3067\u30c7\u30fc\u30bf\u5909\u63db\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\u3055\u3089\u306b\u3001\u3053\u306e\u307e\u307e\u3067\u306f\u9078\u629e\u3055\u308c\u305f\u753b\u50cf\u306e\u7e26\u6a2a\u30b5\u30a4\u30ba\u304c\u308f\u304b\u308a\u307e\u305b\u3093\u306e\u3067\u3001new Image()<\/code>\u3092\u4f7f\u3063\u3066\u305d\u308c\u3089\u3092\u53d6\u5f97\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\u9078\u629e\u753b\u50cf\u306e\u30d7\u30ec\u30d3\u30e5\u30fc\u90e8\u5206\u3092\u3064\u304f\u308b<\/h1>\n
\u7d9a\u3044\u3066\u306f\u3001\u9078\u629e\u3055\u308c\u305f\u753b\u50cf\u3092\u30d7\u30ec\u30d3\u30e5\u30fc\u8868\u793a\u3059\u308b\u90e8\u5206\u3067\u3059\u3002<\/p>\n
<div id=\"app\" class=\"p-3\">\r\n\r\n <!-- \u7701\u7565 -->\r\n\r\n <div v-if=\"imageContents\"><\/strong>\r\n <hr><\/strong>\r\n <div class=\"my-3\"><\/strong>\r\n \u5909\u66f4\u5f8c\u306e\u30b5\u30a4\u30ba\u306f\uff1f\uff1f<br><\/strong>\r\n <input type=\"number\" min=\"1\" v-model=\"resizingWidth\"> \u00d7 <input type=\"number\" min=\"1\" v-model=\"resizingHeight\"><\/strong>\r\n <\/strong>\r\n <button class=\"btn btn-success\" @click=\"save\">\u4fdd\u5b58\u3059\u308b<\/button><\/strong>\r\n <\/div><\/strong>\r\n <strong>\u753b\u50cf\u30d7\u30ec\u30d3\u30e5\u30fc<\/strong><\/strong>\r\n <br><\/strong>\r\n <img :style=\"previewStyles\" :src=\"imageContents\"><\/strong>\r\n <\/div><\/strong>\r\n<\/div><\/pre>\n\u3053\u3053\u3067\u3084\u3063\u3066\u3044\u308b\u306e\u306f\u3001\u307e\u305a\u5148\u307b\u3069\u3064\u304f\u3063\u305fimageContents()<\/code><\/p>\n\u306e\u4e2d\u8eab\u304c\u5b58\u5728\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092v-if<\/code>\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3001\u3082\u3057\u5b58\u5728\u3057\u3066\u3044\u308c\u3070\uff08\u3064\u307e\u308a\u3001\u753b\u50cf\u304c\u9078\u629e\u3055\u308c\u3066\u3044\u308c\u3070\uff09\u30d7\u30ec\u30d3\u30e5\u30fc\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\u307e\u305f\u3001\u30d7\u30ec\u30d3\u30e5\u30fc\u753b\u50cf\u306e\u4e0a\u306b\u306f\u7e26\u6a2a\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3067\u304d\u308b\u3088\u3046\u5165\u529b\u30dc\u30c3\u30af\u30b9\u3092\uff12\u3064\u7528\u610f\u3057\u3001v-model<\/code>\u3092\u4f7f\u3063\u3066Vue<\/code>\u306e\u5909\u6570\u3068\u9023\u52d5\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n![\"\"](\"https:\/\/blog.capilano-fw.com\/wp-content\/uploads\/2019\/10\/native_file_system_api_3-1.png\")
<\/p>\n
\u305d\u3057\u3066\u3001\u3053\u306e\u7e26\u6a2a\u30b5\u30a4\u30ba\u306f\u6307\u5b9a\u3055\u308c\u305f\u6570\u5024\u306b\u3088\u3063\u3066\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u30d7\u30ec\u30d3\u30e5\u30fc\u753b\u50cf\u306b\u53cd\u6620\u3055\u308c\u308b\u3088\u3046\u306bpreviewStyles<\/code>\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u6307\u5b9a\u3059\u308b\u3088\u3046\u306b\u3057\u3001\u3055\u3089\u306b\u3001\u753b\u50cf\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306e\u30dc\u30bf\u30f3\u306b\u306fsave<\/code>\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u3082\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\u3053\u308c\u3089\uff12\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3053\u3046\u306a\u308a\u307e\u3059\u3002<\/p>\n
new Vue({\r\n\r\n \/\/ \u7701\u7565\r\n\r\n computed: {\r\n\r\n \/\/ \u7701\u7565\r\n\r\n previewStyles() {<\/strong>\r\n\r\n let styles = {};<\/strong>\r\n\r\n if(this.resizingWidth > 0) {<\/strong>\r\n\r\n \/\/ \u6a2a\u5e45\u3092 300px \u306b\u3057\u305f\u3068\u304d\u306e\u9ad8\u3055\u3092\u8a08\u7b97<\/strong>\r\n const width = 300;<\/strong>\r\n const height = width \/ this.resizingWidth * this.resizingHeight;<\/strong>\r\n styles = {<\/strong>\r\n width: width +'px',<\/strong>\r\n height: height +'px',<\/strong>\r\n border: '3px solid #000'<\/strong>\r\n };<\/strong>\r\n\r\n }<\/strong>\r\n\r\n return styles;<\/strong>\r\n\r\n }<\/strong>\r\n },\r\n methods: {\r\n\r\n \/\/ \u7701\u7565\r\n\r\n async save() {<\/strong>\r\n\r\n let canvas = document.createElement('canvas');<\/strong>\r\n let ctx = canvas.getContext('2d');<\/strong>\r\n canvas.width = this.resizingWidth;<\/strong>\r\n canvas.height = this.resizingHeight;<\/strong>\r\n\r\n let img = new Image();<\/strong>\r\n img.onload = () => {<\/strong>\r\n\r\n \/\/ canvas\u306b\u30ea\u30b5\u30a4\u30ba\u3057\u305f\u753b\u50cf\u3092\u63cf\u753b<\/strong>\r\n ctx.drawImage(img, 0, 0, this.resizingWidth, this.resizingHeight);<\/strong>\r\n canvas.toBlob(this.saveImage);<\/strong>\r\n\r\n };<\/strong>\r\n img.src = this.imageContents;<\/strong>\r\n\r\n },<\/strong>\r\n async saveImage(resizedImageData) {<\/strong>\r\n\r\n const options = {<\/strong>\r\n type: 'saveFile', \/\/ \u30bb\u30fc\u30d6\u30e2\u30fc\u30c9<\/strong>\r\n accepts: [{<\/strong>\r\n mimeTypes: ['image\/png']<\/strong>\r\n }],<\/strong>\r\n };<\/strong>\r\n const handle = await window.chooseFileSystemEntries(options);<\/strong>\r\n const writer = await handle.createWriter();<\/strong>\r\n await writer.truncate(0);<\/strong>\r\n await writer.write(0, resizedImageData);<\/strong>\r\n await writer.close();<\/strong>\r\n\r\n }<\/strong>\r\n }\r\n});<\/pre>\n\u307e\u305apreviewStyles()<\/code>\u3067\u306f\u3001\u6a2a\u5e45\u3092300px\u306b\u56fa\u5b9a\u3057\u305f\u5834\u5408\u9ad8\u3055\u304c\u3044\u304f\u3089\u306b\u306a\u308b\u304b\u3092\u8a08\u7b97\u3057\u3001\u305d\u308c\u3092\u30b9\u30bf\u30a4\u30eb\u30b7\u30fc\u30c8\u306b\u53cd\u6620\u3059\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\u307e\u305f\u3001save()<\/code>\u3067\u306f\u3001JavaScript\u5185\u3067<canvas><\/canvas><\/code>\u3092\u4f5c\u6210\u3057\u3001\u305d\u3053\u306b\u9078\u629e\u3055\u308c\u305f\u753b\u50cf\u3092\u63cf\u753b\u3059\u308b\u3053\u3068\u3067\u30ea\u30b5\u30a4\u30ba\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\u3055\u3089\u306b\u3001\u5b9f\u969b\u306b\u753b\u50cf\u3092\u4fdd\u5b58\u3059\u308b\u90e8\u5206\u306fsaveImage()<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u3001\u3053\u3053\u3067\u306f\u30bb\u30fc\u30d6\u30e2\u30fc\u30c9\u3092\u6307\u5b9a\u3057\u305fchooseFileSystemEntries()<\/code>\u3092\u4f7f\u3063\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u66f8\u304d\u8fbc\u3080\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\u203b \u4eca\u56de\u306f\u8aac\u660e\u304c\u8907\u96d1\u306b\u306a\u308b\u305f\u3081image\/png<\/code>\u306e\u307f\u3092\u6709\u52b9\u306b\u3057\u307e\u3057\u305f\u304c\u3001toBlob()<\/code>\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3059\u308b\u3068jpeg<\/code>\u3082\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u3001\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306a\u3069\u3067png<\/code>\u3084jpeg<\/code>\u306a\u3069\u753b\u50cf\u5f62\u5f0f\u304c\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u3068\u3044\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\ncanvas.toBlob(this.saveImage, 'image\/jpeg'<\/strong>);<\/pre>\n\u304a\u75b2\u308c\u69d8\u3067\u3057\u305f\uff01<\/p>\n
\u30c6\u30b9\u30c8\u3057\u3066\u307f\u308b<\/h1>\n
\u3067\u306f\u3001\u4eca\u56de\u958b\u767a\u3057\u305f\u5185\u5bb9\u3092\u5b9f\u969b\u306b\u30c6\u30b9\u30c8\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
![\"\"](\"https:\/\/blog.capilano-fw.com\/wp-content\/uploads\/2019\/04\/no_1.png\")
<\/p>\n![\"\"](\"https:\/\/blog.capilano-fw.com\/wp-content\/uploads\/2019\/10\/native_file_system_api_1.png\")
<\/p>\n![\"\"](\"https:\/\/blog.capilano-fw.com\/wp-content\/uploads\/2019\/10\/native_file_system_api_2.png\")
<\/p>\n