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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
commit310fd066e91f454b990372ffa30e803cc8120975 (patch)
treed5d900deb656a5da18e0b60d00f0db73f3a2e88e /files/zh-cn/web/api/filereader/中止事件(abort)/index.html
parent8260a606c143e6b55a467edf017a56bdcd6cba7e (diff)
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----
-title: 'FileReader: 中止事件(abort)'
-slug: Web/API/FileReader/中止事件(abort)
-tags:
- - API
- - FileReader
- - ProgressEvent
- - Reference
- - Web
- - abort
- - 中止
- - 事件
-translation_of: Web/API/FileReader/abort_event
----
-<div>{{APIRef}}</div>
-
-<p>在中止读取时会触发 <code>abort</code> 事件: 例如程序调用{{domxref("FileReader.abort()")}}.</p>
-
-<table class="properties">
- <tbody>
- <tr>
- <th scope="row">Bubbles</th>
- <td>No</td>
- </tr>
- <tr>
- <th scope="row">可取消</th>
- <td>No</td>
- </tr>
- <tr>
- <th scope="row">接口</th>
- <td>{{domxref("ProgressEvent")}}</td>
- </tr>
- <tr>
- <th scope="row">事件处理属性</th>
- <td>{{domxref("FileReader.onabort")}}</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="例子">例子</h2>
-
-<h3 id="实例">实例</h3>
-
-<h4 id="HTML">HTML</h4>
-
-<pre class="brush: html notranslate">&lt;div class="example"&gt;
-
- &lt;div class="file-select"&gt;
- &lt;label for="avatar"&gt;选择你的头像:&lt;/label&gt;
- &lt;input type="file"
- id="avatar" name="avatar"
- accept="image/png, image/jpeg"&gt;
- &lt;/div&gt;
-
- &lt;img src="" class="preview" height="200" alt="图像预览..."&gt;
-
- &lt;div class="event-log"&gt;
- &lt;label&gt;事件日志:&lt;/label&gt;
- &lt;textarea readonly class="event-log-contents"&gt;&lt;/textarea&gt;
- &lt;/div&gt;
-
- &lt;/div&gt;</pre>
-
-<div class="hidden">
-<h4 id="CSS">CSS</h4>
-
-<pre class="brush: css notranslate">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&gt;label {
- display: block;
-}
-
-.event-log-contents {
- resize: none;
-}</pre>
-</div>
-
-<h4 id="JS">JS</h4>
-
-<pre class="brush: js notranslate">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);
- }
- reader.abort();
-}
-
-fileInput.addEventListener('change', handleSelected);返回返回发的
-</pre>
-
-<h4 id="返回结果">返回结果</h4>
-
-<p>{{ EmbedLiveSample('Live_example', '100%', '300px') }}</p>
-
-<h2 id="参数">参数</h2>
-
-<table class="standard-table">
- <thead>
- <tr>
- <th scope="col">参数</th>
- <th scope="col">状态</th>
- </tr>
- </thead>
- <tbody>
- <tr>
- <td>{{SpecName('File API', '#dfn-abort-event')}}</td>
- <td>{{Spec2('File API')}}</td>
- </tr>
- </tbody>
-</table>
-
-<h2 id="浏览器兼容性">浏览器兼容性</h2>
-
-<div class="hidden">此页上的兼容性表是从结构化数据生成的。如果你想对数据有所贡献,请查看https://github.com/mdn/browser-compat-data并向我们发送请求。</div>
-
-<p>{{Compat("api.FileReader.abort_event")}}</p>
-
-<h2 id="另请参见">另请参见</h2>
-
-<ul>
- <li>相关事件: {{domxref("FileReader.loadstart_event", "loadstart")}}, {{domxref("FileReader.loadend_event", "loadend")}}, {{domxref("FileReader.progress_event", "progress")}}, {{domxref("FileReader.error_event", "error")}}, {{domxref("FileReader.load_event", "load")}}.</li>
-</ul>