diff options
Diffstat (limited to 'files/ja/web/api/filereader/load_event')
| -rw-r--r-- | files/ja/web/api/filereader/load_event/index.html | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/files/ja/web/api/filereader/load_event/index.html b/files/ja/web/api/filereader/load_event/index.html new file mode 100644 index 0000000000..2cbb63289a --- /dev/null +++ b/files/ja/web/api/filereader/load_event/index.html @@ -0,0 +1,171 @@ +--- +title: 'FileReader: load イベント' +slug: Web/API/FileReader/load_event +tags: + - API + - Event + - FileReader + - Web + - load +translation_of: Web/API/FileReader/load_event +--- +<div>{{APIRef}}</div> + +<p><code>load</code> イベントは、ファイルが正常に読み込めたときに発生します。</p> + +<table class="properties"> + <tbody> + <tr> + <th scope="row">バブリング</th> + <td>なし</td> + </tr> + <tr> + <th scope="row">キャンセル可能</th> + <td>いいえ</td> + </tr> + <tr> + <th scope="row">インターフェイス</th> + <td>{{domxref("ProgressEvent")}}</td> + </tr> + <tr> + <th scope="row">イベントハンドラープロパティ</th> + <td>{{domxref("FileReader.onload")}}</td> + </tr> + </tbody> +</table> + +<h2 id="Examples" name="Examples">例</h2> + +<h3 id="Live_example" name="Live_example">ライブデモ</h3> + +<h4 id="HTML">HTML</h4> + +<pre class="brush: html"><div class="example"> + + <div class="file-select"> + <label for="avatar">Choose a profile picture:</label> + <input type="file" + id="avatar" name="avatar" + accept="image/png, image/jpeg"> + </div> + + <img src="" class="preview" height="200" alt="Image preview..."> + + <div class="event-log"> + <label>Event log:</label> + <textarea readonly class="event-log-contents"></textarea> + </div> + + </div></pre> + +<div class="hidden"> +<h4 id="CSS">CSS</h4> + +<pre class="brush: css">img.preview { + margin: 1rem 0; +} + +.event-log-contents { + width: 18rem; + height: 5rem; + border: 1px solid black; + margin: .2rem; + padding: .2rem; +} + +.example { + display: grid; + grid-template-areas: + "select log" + "preview log"; +} + +.file-select { + grid-area: select; +} + +.preview { + grid-area: preview; +} + +.event-log { + grid-area: log; +} + +.event-log>label { + display: block; +} + +.event-log-contents { + resize: none; +}</pre> +</div> + +<h4 id="JS">JS</h4> + +<pre class="brush: js">const fileInput = document.querySelector('input[type="file"]'); +const preview = document.querySelector('img.preview'); +const eventLog = document.querySelector('.event-log-contents'); +const reader = new FileReader(); + +function handleEvent(event) { + eventLog.textContent = eventLog.textContent + `${event.type}: ${event.loaded} bytes transferred\n`; + + if (event.type === "load") { + preview.src = reader.result; + } +} + +function addListeners(reader) { + reader.addEventListener('loadstart', handleEvent); + reader.addEventListener('load', handleEvent); + reader.addEventListener('loadend', handleEvent); + reader.addEventListener('progress', handleEvent); + reader.addEventListener('error', handleEvent); + reader.addEventListener('abort', handleEvent); +} + +function handleSelected(e) { + eventLog.textContent = ''; + const selectedFile = fileInput.files[0]; + if (selectedFile) { + addListeners(reader); + reader.readAsDataURL(selectedFile); + } +} + +fileInput.addEventListener('change', handleSelected); +</pre> + +<h4 id="Result" name="Result">結果</h4> + +<p>{{ EmbedLiveSample('Live_example', '100%', '300px') }}</p> + +<h2 id="Specifications" name="Specifications">仕様書</h2> + +<table class="standard-table"> + <thead> + <tr> + <th scope="col">仕様書</th> + <th scope="col">状態</th> + </tr> + </thead> + <tbody> + <tr> + <td>{{SpecName('File API', '#dfn-load-event')}}</td> + <td>{{Spec2('File API')}}</td> + </tr> + </tbody> +</table> + +<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの対応</h2> + +<div class="hidden">このページの互換性一覧表は構造化データから生成されています。データに協力していただけるのであれば、 <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> をチェックアウトしてプルリクエストを送信してください。</div> + +<p>{{Compat("api.FileReader.load_event")}}</p> + +<h2 id="See_also" name="See_also">関連情報</h2> + +<ul> + <li>関連イベント: {{domxref("FileReader.loadstart_event")}}, {{domxref("FileReader.loadend_event")}}, {{domxref("FileReader.progress_event")}}, {{domxref("FileReader.error_event")}}, {{domxref("FileReader.abort_event")}}</li> +</ul> |