Created
July 4, 2013 10:31
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ブラウザにファイルをドロップし、情報と内容を表示するhtmlとjs
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| (function(global, $) { | |
| "use strict"; | |
| var util = { | |
| // ブラウザのデフォルトの動作と、イベントの伝播をキャンセルする | |
| stop: function(e) { | |
| e.preventDefault(); | |
| e.stopPropagation(); | |
| }, | |
| // strを指定の長さで切り取る | |
| cutoff: function(str, len, tail) { | |
| tail = tail || ""; | |
| return str.slice(0, len) + tail; | |
| } | |
| } | |
| $(function() { | |
| var $dropArea = $("#dropable"); | |
| // ドラッグ関連のイベントをすべてキャンセルして、ドロップイベントを設定 | |
| $dropArea.on({ | |
| "dragenter": util.stop, | |
| "dragover": util.stop, | |
| "dragleave": util.stop, | |
| "drop": function(e) { | |
| util.stop(e); | |
| // filesはargumentsのようなオブジェクトなので配列に変換 | |
| var tmp = e.originalEvent.dataTransfer.files, | |
| files = Array.prototype.slice.call(tmp, 0, tmp.length); | |
| files.forEach(function(file) { | |
| var reader = new FileReader(); | |
| // 読み込みが完了した時のイベントを設定 | |
| $(reader).one('load', function(e) { | |
| var fn = "ドロップされたファイル名：" + file.name, | |
| ft = "ファイルの形式：" + file.type, | |
| fs = "ファイルサイズ：" + file.size + " Byte", | |
| fv = "内容：" + util.cutoff(e.target.result, 80, "...[略]"), | |
| msg = [fn, ft, fs, fv].join("\n"); | |
| $dropArea.append( $("<pre></pre>").text(msg) ); | |
| }); | |
| // ファイルをテキストとして読み込む | |
| reader.readAsText(file); | |
| }); | |
| } | |
| }); | |
| }); | |
| }(this, jQuery)); |
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| <!DOCTYPE html> | |
| <html lang="ja"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>ファイルドロップをキャンセルするサンプル</title> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script> | |
| <script src="filedrop.js"></script> | |
| </head> | |
| <body> | |
| <div id="dropable">ここにファイルをドロップしてみて下さい</div> | |
| </body> | |
| </html> |
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