(编辑:jimmy 日期: 2024/11/19 浏览:2)
aria-label
正常情况下,form表单的input组件都有对应的label.当input组件获取到焦点时,屏幕阅读器会读出相应的label里的文本。
<!DOCTYPE html> <html> <head> <meta charset = "utf-8"> <title>demo</title> <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="external nofollow" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous"> <script src="/UploadFiles/2021-04-02/jquery.slim.min.js">但是如果我们没有给输入框设置label时,当其获得焦点时,屏幕阅读器会读出aria-label属性的值,aria-label不会在视觉上呈现效果。
<body> <form role = "form"> <div class="form-group col-lg-3 form-horizontal"> <div class="col-lg-7"> <input type = "text" id = "idCard" class="form-control" aria-label = "身份证号"> </div> </div> </form> </body> aria-labelledby <body> <div class="dropdown"> <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" data-toggle="dropdown"> 选择您的职位 <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1"> <li role="presentation"> <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >测试工程师</a> </li> <li role="presentation"> <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >开发工程师</a> </li> <li role="presentation"> <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" >销售工程师</a> </li> </ul> </div> </body>注:
如果一个元素同时有aria-labelledby和aria-label,读屏软件会优先读出aria-labelledby的内容
总结
以上所述是小编给大家介绍的Bootstrap的aria-label和aria-labelledby属性实例详解,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!