HTML5表单的属性有哪些

前言：

HTML5表单是指通过HTML5中定义的新属性和元素来增强和扩展表单的功能和交互性。在本文中，我将介绍一些HTML5表单中常用的属性，并解释它们的用途和规范。

1. required

required属性用于指定表单字段是否为必填项，即用户必须填写该字段才能成功提交表单。可以将required属性应用在、和等元素上。</p> <pre class="brush:html;toolbar:false"> <input type="text" name="username" required> <select name="gender" required> <option value="">请选择性别</option> <option value="male">男</option> <option value="female">女</option> </select> </pre> <p>在上面的示例中，用户名字段是必填项，因此用户必须填写用户名才能成功提交表单。性别字段同样也是必填项，用户必须选择一个选项才能继续操作。</p> <h4>2. placeholder</h4> <p>placeholder属性用于在表单字段中显示一段提示文本，以向用户提供输入格式或期望的内容。该属性的值将在用户开始输入时自动清除。</p> <pre class="brush:html;toolbar:false"> <input type="text" name="username" placeholder="请输入用户名"> <input type="password" name="password" placeholder="请输入密码"> </pre> <p>在上面的示例中，用户名字段和密码字段都使用了placeholder属性。当用户将焦点放在这些字段上时，相应的提示文本将显示在字段中。</p> <h4>3. autofocus</h4> <p>autofocus属性用于指定浏览器加载页面后，自动将焦点设置在指定的表单字段上，从而方便用户进行输入。</p> <pre class="brush:html;toolbar:false"> <input type="text" name="username" autofocus> </pre> <p>在上面的示例中，页面加载后，用户名字段将自动获得焦点，用户可以立即开始输入而无需手动选择该字段。这样可以提升用户的输入效率和体验。</p> <h4>总结：</h4> <p>以上介绍了HTML5表单中的一些常用属性，包括required、placeholder和autofocus。这些属性能够增强表单的交互性、用户体验和数据完整性。使用这些属性可以使用户更方便地填写和提交表单。</p> </div> <div class="share" id="down"> <div class="share-text"> <p>本文如果侵犯了你的权益请联系站长整改删除</p> <p>转载请注明出处</p> <p>本文地址：<a href="https://www.radbuilder.com/marketing/Python/25096.html" target="_blank">https://www.radbuilder.com/marketing/Python/25096.html</a></p> </div> </div> </div> </div> <div class="clear blank"></div> <div class="down-links whitebg"> <div class="news-title"> <h2></h2> </div> <ul> </ul> </div> <div class="clear blank"></div> <div class="down-otherlink whitebg"> <div class="news-title"> <h2>图文推荐</h2> </div> <ul> <li><a href="https://www.radbuilder.com/marketing/Python/2052.html" target="_blank"><i><img src="/d/file/p/2023/07-01/small6647a07de5915ca25dce66845345e784.jpg"></i> <p>如何在php中对json对象的值进行输出</p> <span class="down-info"></span></a></li> <li><a href="https://www.radbuilder.com/marketing/Python/2007.html" target="_blank"><i><img src="/d/file/p/2023/07-01/small1c14fee124197f8a8d8d542f6468c434.jpg"></i> <p>jquery min js指的是什么</p> <span class="down-info"></span></a></li> <li><a href="https://www.radbuilder.com/marketing/Python/2049.html" target="_blank"><i><img src="/d/file/p/2023/07-01/small3b228fd92e9008dce070ca2578c632ff.jpg"></i> <p>正在执行的SQL语句怎么在postgresql中结束</p> <span class="down-info"></span></a></li> <li><a href="https://www.radbuilder.com/marketing/Python/1995.html" target="_blank"><i><img src="/d/file/p/2023/07-01/small1b9fcb9991e07208298c92968b167cbe.jpg"></i> <p>PHP中is+numeric与ctype+digit有什么不同</p> <span class="down-info"></span></a></li> <li><a href="https://www.radbuilder.com/marketing/Python/2109.html" target="_blank"><i><img src="/d/file/p/2023/07-02/small27f3e50affd2acd5029588ed2c1111ab.jpg"></i> <p>利用php如何对非法字符进行过滤</p> <span class="down-info"></span></a></li> <li><a href="https://www.radbuilder.com/marketing/Python/2102.html" target="_blank"><i><img src="/d/file/p/2023/07-02/smalle75ad5f22e9a604e3a9a83f0dd057d19.jpg"></i> <p>怎么在Java中使用LinkedList</p> <span class="down-info"></span></a></li> </ul> </div> <div class="pinglun-box whitebg"> <div class="news-title"> <h2></h2> </div> </div> </div> <aside class="side-section right-box"> <div class="whitebg down-tuijian"> </div> <div class="blank clear" ></div> <div class="whitebg down-paihang"> <h2 class="side-title">热门排行</h2> <ul> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/2052.html" title="如何在php中对json对象的值进行输出" target="_blank">如何在php中对json对象的值进行输出</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/3489.html" title="ps如何把皮肤通透白嫩" target="_blank">ps如何把皮肤通透白嫩</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/989.html" title="怎么使用PHP进行人工智能开发" target="_blank">怎么使用PHP进行人工智能开发</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/11784.html" title="js中怎么用文件流下载csv文件" target="_blank">js中怎么用文件流下载csv文件</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/1008.html" title="XML文档不能使用css样式表如何办" target="_blank">XML文档不能使用css样式表如何办</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/1174.html" title="uniapp实现定位权限" target="_blank">uniapp实现定位权限</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/1244.html" title="Python实现热加载配置文件的方法" target="_blank">Python实现热加载配置文件的方法</a></li> <li><i></i><a href="https://www.radbuilder.com/marketing/Python/2007.html" title="jquery min js指的是什么" target="_blank">jquery min js指的是什么</a></li> </ul> </div> <div class="blank clear" ></div> <div class="whitebg cloud"> <h2 class="side-title">标签云</h2> <ul> <a href="https://www.radbuilder.com/e/tags/?tagid=102&tempid=8" target="_blank">c语言(750)</a> <a href="https://www.radbuilder.com/e/tags/?tagid=73&tempid=8" target="_blank">PHP(1)</a> <a href="https://www.radbuilder.com/e/tags/?tagid=64&tempid=8" target="_blank">C(6)</a> <a href="https://www.radbuilder.com/e/tags/?tagid=63&tempid=8" target="_blank">C++(7)</a> </ul> </div> <div class="ad ad-small"></div> <div class="whitebg down-suiji"> <h2 class="side-title">猜你喜欢</h2> <ul> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/14292.html"><i><img src=""></i> <p>人工智能领域的6大关键创新是什么</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/1409.html"><i><img src=""></i> <p>XML解析基础</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/21068.html"><i><img src=""></i> <p>怎么使用Python Flask构建高效API应用并实现后台任务</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/22894.html"><i><img src=""></i> <p>Python in Python 用Python实现Python语言的基础功能</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/2745.html"><i><img src=""></i> <p>集成缓存PHP高性能的秘密</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/15393.html"><i><img src=""></i> <p>HTML5 地理定位</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/17527.html"><i><img src=""></i> <p>python里append方法有什么用</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/9161.html"><i><img src=""></i> <p>c语言如何用scanf输入字符串</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/16642.html"><i><img src=""></i> <p>怎么使用OpenCV和像素处理图像灰度化</p> <span class="down-info"></span></a></li> <li><a target="_blank" href="https://www.radbuilder.com/marketing/Python/18581.html"><i><img src=""></i> <p>bootstrap如何快速入门</p> <span class="down-info"></span></a></li> </ul> </div> </aside> </article> <div class="clear blank"></div> <footer> <div class="footer box"> <div class="wxbox"> <ul> <li><span> </span></li> <li><span> </span></li> </ul> </div> <div class="endnav"> <p>备案号：<a href="https://beian.miit.gov.cn/" target="_blank" rel="nofollow">粤ICP备2023061792号-2</a> <a href="https://www.radbuilder.com/sitemap.xml" target="_blank">网站地图</a></p> </div> </div> </footer> <div class="toolbar-open"></div> <div class="toolbar"> <div class="toolbar-close"><span id="closed"></span></div> <div class="toolbar-nav"> <ul id="toolbar-menu"> <li><i class="side-icon-user"></i> <section> <div class="userinfo"> <script src="https://www.radbuilder.com/e/member/login/loginjs.php"></script> </div> </section> </li> <li><i class="side-icon-qq"></i> <section class="qq-section"> <div class="qqinfo"><a href="http://wpa.qq.com/msgrd?v=3&uin=19801987&site=qq&menu=yes">站长QQ</a></div> </section> </li> <li><i class="side-icon-weixin"></i> <section class="weixin-section"> <div class="weixin-info"> <p>个人微信</p> <p class="text12">工作时间</p> <p class="text12">周一至周日 9:00-21:00</p> </div> </section> </li> <li><i class="side-icon-dashang"></i> <section class="dashang-section"> <p></p> <ul> <li></li> <li></li> </ul> </section> </li> </ul> </div> </div> <div class="endmenu"> <ul> <li><a href="https://www.radbuilder.com/"><i class="iconfont icon-shouye"></i>首页</a></li> <li><a href="https://www.radbuilder.com/phone-fenlei.html"><i class="iconfont icon-fenlei"></i>分类</a></li> <li><a href="https://www.radbuilder.com/phone-list.html"><i class="iconfont icon-navicon-wzgl"></i>所有</a></li> <li><a href="https://www.radbuilder.com/e/member/my/"><i class="iconfont icon-My"></i>我的</a></li> </ul> </div> <a href="#" title="返回顶部" class="icon-top"></a> </body> </html><script src="https://www.radbuilder.com/e/public/onclick/?enews=donews&classid=20&id=25096"></script>