如何使用JavaScript将<input type=

中的实际文件显示在

标签中？" />
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<h1 class="entry-title">如何使用JavaScript将<input type="file>中的实际文件显示在<textarea>标签中？</h1>						</header>
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</span><span class="single-meta-area"><span class="meta-date"><time datetime="2023-03-09 18:55:11">2023年3月9日 18:55:11</time></span><span class="meta-cat"><a href="https://go.coder-hub.com/category/go" rel="category tag">go</a></span><span class="comment"><a href="https://go.coder-hub.com/75683630.html#respond"><i class="be be-speechbubble ri"></i><span class="comment-qa"></span><em>评论</em></a></span><span class="views"><i class="be be-eye ri"></i>77</span><span class="word-time"></span><span class="reading-open">阅读模式</span></span></div><span class="reading-close"><i class="be be-cross"></i></span><span class="s-hide" title="侧边栏"><span class="off-side"></span></span>			
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<details>
<summary>英文:</summary>
<p>How can I get the actual file in an <input type=file>, to be displayed in the <textarea> tag with JavaScript?<br />
</details>
<h1 id="heading">问题</h1>
<p>以下是翻译好的代码部分：</p>
<pre tabindex="0" style="color:#f8f8f2;background-color:#272822;"><code><span style="display:flex;"><span><span style="color:#66d9ef">let</span> <span style="color:#a6e22e">textfile</span> <span style="color:#f92672">=</span> document.<span style="color:#a6e22e">getElementById</span>(<span style="color:#e6db74">'file'</span>);
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">let</span> <span style="color:#a6e22e">textarea</span> <span style="color:#f92672">=</span> document.<span style="color:#a6e22e">getElementById</span>(<span style="color:#e6db74">'compose'</span>);
</span></span><span style="display:flex;"><span><span style="color:#a6e22e">console</span>.<span style="color:#a6e22e">log</span>(<span style="color:#a6e22e">textarea</span>);
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#a6e22e">textfile</span>.<span style="color:#a6e22e">addEventListener</span>(<span style="color:#e6db74">'change'</span>, (<span style="color:#a6e22e">e</span>) => {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">let</span> <span style="color:#a6e22e">fil</span> <span style="color:#f92672">=</span> <span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">target</span>.<span style="color:#a6e22e">files</span>[<span style="color:#ae81ff">0</span>];
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">if</span> (<span style="color:#a6e22e">fil</span>) {
</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">let</span> <span style="color:#a6e22e">reader</span> <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> <span style="color:#a6e22e">FileReader</span>();
</span></span><span style="display:flex;"><span>        <span style="color:#a6e22e">reader</span>.<span style="color:#a6e22e">readAsDataURL</span>(<span style="color:#a6e22e">fil</span>);
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span>    <span style="color:#a6e22e">textarea</span>.<span style="color:#a6e22e">value</span> <span style="color:#f92672">=</span> <span style="color:#a6e22e">fil</span>;
</span></span><span style="display:flex;"><span>});
</span></span></code></pre>
<p>如果您需要关于代码的进一步解释或帮助，请随时提出。</p>
<details>
<summary>英文:</summary>
<p>I have an input tag with type=file and I want to take the data it selects to display inside a textarea tag. I do not want to display just the file title but the entire file. Like how uploading attachments to emails before they are sent works.<br />
How do I do this with javascript? There is no backend or server-side code in this work yet. I have tried to change the value but it only displayed the object type of the file to the textarea</p>
<pre><code>let textfile = document.getElementById(&#39;file&#39;)
let textarea = document.getElementById(&#39;compose&#39;)
console.log(textarea);

textfile.addEventListener(&#39;change&#39;, (e) =&gt;{
    let fil = e.target.files[0];

if(fil){
        let reader = new FileReader();
        reader.readAsDataURL(fil);
    }

textarea.value = fil 
})
</code></pre>
</details>
<h1 id="1">答案1</h1>
<p><strong>得分</strong>: 1</p>
<p>以下是翻译好的部分：</p>
<p>使用<code>FileReader</code> API，它将读取文件的内容，然后您应该添加<code>onload</code>函数，以便在<code>FileReader</code>加载后才获取数据，然后将<code>textarea</code>元素的值属性设置为文件的内容。</p>
<pre tabindex="0" style="color:#f8f8f2;background-color:#272822;"><code><span style="display:flex;"><span><span style="color:#66d9ef">let</span> <span style="color:#a6e22e">textfile</span> <span style="color:#f92672">=</span> document.<span style="color:#a6e22e">getElementById</span>(<span style="color:#e6db74">'file'</span>);
</span></span><span style="display:flex;"><span><span style="color:#66d9ef">let</span> <span style="color:#a6e22e">textarea</span> <span style="color:#f92672">=</span> document.<span style="color:#a6e22e">getElementById</span>(<span style="color:#e6db74">'compose'</span>);
</span></span><span style="display:flex;"><span>
</span></span><span style="display:flex;"><span><span style="color:#a6e22e">textfile</span>.<span style="color:#a6e22e">addEventListener</span>(<span style="color:#e6db74">'change'</span>, (<span style="color:#a6e22e">e</span>) => {
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">let</span> <span style="color:#a6e22e">file</span> <span style="color:#f92672">=</span> <span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">target</span>.<span style="color:#a6e22e">files</span>[<span style="color:#ae81ff">0</span>];
</span></span><span style="display:flex;"><span>    <span style="color:#66d9ef">if</span> (<span style="color:#a6e22e">file</span>) {
</span></span><span style="display:flex;"><span>        <span style="color:#66d9ef">let</span> <span style="color:#a6e22e">reader</span> <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> <span style="color:#a6e22e">FileReader</span>();
</span></span><span style="display:flex;"><span>        <span style="color:#a6e22e">reader</span>.<span style="color:#a6e22e">readAsText</span>(<span style="color:#a6e22e">file</span>);
</span></span><span style="display:flex;"><span>        <span style="color:#a6e22e">reader</span>.<span style="color:#a6e22e">onload</span> <span style="color:#f92672">=</span> <span style="color:#66d9ef">function</span>(<span style="color:#a6e22e">e</span>) {
</span></span><span style="display:flex;"><span>            <span style="color:#a6e22e">textarea</span>.<span style="color:#a6e22e">value</span> <span style="color:#f92672">=</span> <span style="color:#a6e22e">e</span>.<span style="color:#a6e22e">target</span>.<span style="color:#a6e22e">result</span>;
</span></span><span style="display:flex;"><span>        }
</span></span><span style="display:flex;"><span>    }
</span></span><span style="display:flex;"><span>});
</span></span></code></pre>
<pre tabindex="0" style="color:#f8f8f2;background-color:#272822;"><code><span style="display:flex;"><span><<span style="color:#f92672">div</span>>
</span></span><span style="display:flex;"><span>  <<span style="color:#f92672">input</span> <span style="color:#a6e22e">type</span><span style="color:#f92672">=</span><span style="color:#e6db74">"file"</span> <span style="color:#a6e22e">id</span><span style="color:#f92672">=</span><span style="color:#e6db74">"file"</span>>
</span></span><span style="display:flex;"><span></<span style="color:#f92672">div</span>>
</span></span><span style="display:flex;"><span><<span style="color:#f92672">div</span>>
</span></span><span style="display:flex;"><span>  <<span style="color:#f92672">textarea</span> <span style="color:#a6e22e">id</span><span style="color:#f92672">=</span><span style="color:#e6db74">"compose"</span> <span style="color:#a6e22e">rows</span><span style="color:#f92672">=</span><span style="color:#e6db74">"5"</span> <span style="color:#a6e22e">cols</span><span style="color:#f92672">=</span><span style="color:#e6db74">"50"</span>></<span style="color:#f92672">textarea</span>>
</span></span><span style="display:flex;"><span></<span style="color:#f92672">div</span>>
</span></span></code></pre>
<details>
<summary>英文:</summary>
<p>Here is an example:</p>
<p>Using the <code>FileReader</code> <code>API</code>, So it will read the contents of the file and then you should add <code>onload</code> function to get the data only after the load of <code>FileReader</code>, then set the value property of the <code>textarea</code> element to the contents of the file.</p>
<p></p>
<p></p>
<pre><code>let textfile = document.getElementById(&#39;file&#39;);
let textarea = document.getElementById(&#39;compose&#39;);

textfile.addEventListener(&#39;change&#39;, (e) =&gt; {
    let file = e.target.files[0];
    if (file) {
        let reader = new FileReader();
        reader.readAsText(file);
        reader.onload = function(e) {
            textarea.value = e.target.result;
        }
    }
});
</code></pre>
<p></p>
<pre><code>&lt;div&gt;
  &lt;input type=&quot;file&quot; id=&quot;file&quot;&gt;
&lt;/div&gt;
&lt;div&gt;
  &lt;textarea id=&quot;compose&quot; rows=&quot;5&quot; cols=&quot;50&quot;&gt;&lt;/textarea&gt;
&lt;/div&gt;
</code></pre>
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