关于html textarea标签。

HTML中的</code>标签定义了一个多行的文本输入控件，用于收集用户的输入。可以通过<code>cols</code>和<code>rows</code>属性来规定<code><span class="wpcom_tag_link"><a href="https://www.cwhello.com/tag/63583" title="textarea" target="_blank">textarea</a></span></code>的尺寸大小，不过更好的办法是使用CSS的<code>height</code>和<code>width</code>属性来设置。 </p> <p>HTML之textarea标签怎么使用</p> <p>HTML中的<code><textarea></code>标签用于创建多行文本输入框，可以让用户在其中输入长篇文本，下面我们详细介绍如何使用<code><textarea></code>标签。</p> <p style="text-align:center"><noscript><img decoding="async" alt="关于html textarea标签。" src="//img.cwhello.com/wp-content/uploads/2024/07/1720248386-20240706144626-6688e8427a835.jpg" /></noscript><img decoding="async" alt="关于html textarea标签。" class="j-lazy" src="https://www.cwhello.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="//img.cwhello.com/wp-content/uploads/2024/07/1720248386-20240706144626-6688e8427a835.jpg" /></p> <p>基本语法</p> <pre class="brush:html;toolbar:false"> <textarea rows="4" cols="50"> 在这里输入文本... </textarea> </pre> <p><code>rows</code>属性表示<span class="wpcom_tag_link"><a href="https://www.cwhello.com/tag/28027" title="文本框" target="_blank">文本框</a></span>的行数，<code>cols</code>属性表示文本框的列数，在上面的例子中，文本框的行数为4,列数为50。</p> <p>常用属性</p> <p><code>name</code>:为<code><textarea></code>标签设置一个名称，以便在表单提交时可以识别该文本框。</p> <p><code>id</code>:为<code><textarea></code>标签设置一个唯一的标识符，方便通过JavaScript或CSS进行操作。</p> <p><code>placeholder</code>:设置一个提示信息，当文本框为空时显示在该位置。</p> <p><code>disabled</code>:禁用文本框，用户无法编辑其中的内容。</p> <p><code>readonly</code>:只读模式，用户可以查看但无法编辑文本框中的内容。</p> <p style="text-align:center"><noscript><img decoding="async" alt="关于html textarea标签。" src="//img.cwhello.com/wp-content/uploads/2024/07/1720248388-20240706144628-6688e8447fada.jpg" /></noscript><img decoding="async" alt="关于html textarea标签。" class="j-lazy" src="https://www.cwhello.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="//img.cwhello.com/wp-content/uploads/2024/07/1720248388-20240706144628-6688e8447fada.jpg" /></p> <p><code>wrap</code>:设置换行方式，可选值有<code>hard</code>(硬换行)、<code>soft</code>(软换行)和<code>off</code>(不换行)。</p> <p>下面是一个包含多个属性的示例：</p> <pre class="brush:html;toolbar:false"> <textarea name="feedback" id="feedback" rows="4" cols="50" placeholder="请输入您的反馈意见" disabled readonly wrap="hard"></textarea> </pre> <p>事件处理</p> <p><code><textarea></code>标签支持一些常见的事件处理，例如获取文本框的值、失去焦点等，以下是一些常用的事件处理方法：</p> <p><code>onchange</code>:当文本框的内容发生变化时触发。</p> <p><code>onfocus</code>:当文本框获得焦点时触发。</p> <p><code>onblur</code>:当文本框失去焦点时触发。</p> <p><code>oninput</code>:当文本框的内容被输入时触发。</p> <p style="text-align:center"><noscript><img decoding="async" alt="关于html textarea标签。" src="//img.cwhello.com/wp-content/uploads/2024/07/1720248390-20240706144630-6688e8460e253.jpg" /></noscript><img decoding="async" alt="关于html textarea标签。" class="j-lazy" src="https://www.cwhello.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="//img.cwhello.com/wp-content/uploads/2024/07/1720248390-20240706144630-6688e8460e253.jpg" /></p> <p><code>onselect</code>:当文本框的内容被选中时触发。</p> <p><code>ondrop</code>:当拖放操作发生时触发。</p> <p><code>oncopy</code>:当复制操作发生时触发。</p> <p><code>onpaste</code>:当粘贴操作发生时触发。</p> <p>下面的代码会在用户点击文本框时弹出一个提示框显示当前的值：</p> <pre class="brush:html;toolbar:false"> <textarea id="myTextarea" oninput="showValue()"></textarea> <script> function showValue() { var textarea = document.getElementById("myTextarea"); alert("当前值为：" + textarea.value); } </script> </pre> <p>相关问题与解答</p> <p>1、如何限制用户只能输入字母和数字？可以使用正则表达式来验证用户输入的内容是否符合要求，示例代码如下：</p> <pre class="brush:html;toolbar:false"> <input type="text" pattern="[A-Za-z0-9]+"> </pre> <div class="entry-copyright"><p>本文来自投稿，不代表重蔚自留地立场，如若转载，请注明出处https://www.cwhello.com/481127.html</p> <p>如有侵犯您的合法权益请发邮件951076433@qq.com联系删除</p></div> </div> <div class="entry-tag"><a href="https://www.cwhello.com/tag/63583" rel="tag">textarea</a><a href="https://www.cwhello.com/tag/28027" 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