站长资源网络编程
详解Bootstrap的aria-label和aria-labelledby应用
简介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。如： demo<</div>
<div class="news_infos"><div id="MyContent"><p><strong>aria-label</strong></p>
<p>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。<br>
如：</p>
<div class="htmlcode">
<pre class="brush:js;">
<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8">
<title>demo</title>
<link href="bootstrap-3.3.4-dist/css/bootstrap.min.css" rel="stylesheet">
<style type="text/css">
body{padding: 20px;}
</style>
</head>
<body>
<form role = "form">
<div class="form-group col-lg-3 form-horizontal">
<label for = "idCard" class="control-label col-lg-5">身份证号：</label>
<div class="col-lg-7">
<input type = "text" id = "idCard" class="form-control">
</div>
</div>
</form>
</body>
</html> </pre>
</div>
<p><a href="javascript:;" onclick="showimg('/UploadFiles/2021-04-02/2016010411113618.png');"><img src="/UploadFiles/2021-04-02/2016010411113618.png" alt="详解Bootstrap的aria-label和aria-labelledby应用" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a></p>
<p>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。<br>
如：</p>
<div class="htmlcode">
<pre class="brush:js;">
<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> </pre>
</div>
<p><a href="javascript:;" onclick="showimg('/UploadFiles/2021-04-02/2016010411113619.png');"><img src="/UploadFiles/2021-04-02/2016010411113619.png" alt="详解Bootstrap的aria-label和aria-labelledby应用" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a></p>
<p><strong>aria-labelledby属性</strong></p>
<p>当想要的标签文本已在其他元素中存在时，可以使用aria-labelledby，并将其值为所有读取的元素的id。如下：<br>
当ul获取到焦点时，屏幕阅读器是会读：“选择您的职位”</p>
<div class="htmlcode">
<pre class="brush:js;">
<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="#">测试工程师</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">开发工程师</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">销售工程师</a>
</li>
</ul>
</div>
</body> </pre>
</div>
<p><a href="javascript:;" onclick="showimg('/UploadFiles/2021-04-02/2016010411113620.png');"><img src="/UploadFiles/2021-04-02/2016010411113620.png" alt="详解Bootstrap的aria-label和aria-labelledby应用" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a></p>
<p>PS：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</p>
<p>以上内容是小编给大家介绍的Bootstrap的aria-label和aria-labelledby应用相关内容，希望本文分享能够给大家带来帮助，同时感谢大家一直以来对网站的支持。</p></div>
</div>
</div>
<div class="share"> </div>
<div class="nextinfo">
<p>上一篇：<a href="http://m.paidiu.com/show/1/110349.html" title="Javascript基于对象三大特性（封装性、继承性、多态性）">Javascript基于对象三大特性（封装性、继承性、多态性）</a></p>
<p>下一篇：<a href="http://m.paidiu.com/show/1/110351.html" title="详解Bootstrap glyphicons字体图标">详解Bootstrap glyphicons字体图标</a></p>
</div>
<div class="otherlink">
<h2>最新资源</h2>
<ul>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619123.html" one-link-mark="yes" title="群星《奔赴！万人现场 第2期》[FLAC/分轨][518.87MB]"><span>群星《奔赴！万人现场 第2期》[FLAC/分轨][518.8</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619122.html" one-link-mark="yes" title="群星《奇妙浪一夏 (上海迪士尼度假区音乐)》[320K/MP3][43.91MB]"><span>群星《奇妙浪一夏 (上海迪士尼度假区音乐)》[32</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619121.html" one-link-mark="yes" title="群星《奇妙浪一夏 (上海迪士尼度假区音乐)》[FLAC/分轨][140.49MB]"><span>群星《奇妙浪一夏 (上海迪士尼度假区音乐)》[FL</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619120.html" one-link-mark="yes" title="【古典音乐】詹姆斯·高威《季节》1993[WAV+CUE]"><span>【古典音乐】詹姆斯·高威《季节》1993[WAV+CUE]</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619119.html" one-link-mark="yes" title="贝拉芳蒂《卡里普索之王》SACD[WAV+CUE]"><span>贝拉芳蒂《卡里普索之王》SACD[WAV+CUE]</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619118.html" one-link-mark="yes" title="小骆驼-《草原狼2(蓝光CD)》[原抓WAV+CUE]"><span>小骆驼-《草原狼2(蓝光CD)》[原抓WAV+CUE]</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619117.html" one-link-mark="yes" title="群星《欢迎来到我身边 电影原声专辑》[320K/MP3][105.02MB]"><span>群星《欢迎来到我身边 电影原声专辑》[320K/MP3</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619116.html" one-link-mark="yes" title="群星《欢迎来到我身边 电影原声专辑》[FLAC/分轨][480.9MB]"><span>群星《欢迎来到我身边 电影原声专辑》[FLAC/分轨</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619115.html" one-link-mark="yes" title="雷婷《梦里蓝天HQⅡ》 2023头版限量编号低速原抓[WAV+CUE][463M]"><span>雷婷《梦里蓝天HQⅡ》 2023头版限量编号低速原抓</span></a>
</li>
<li>
<i class="iconfont icon-point"></i>
<a class="text-sm" href="/show/1/619114.html" one-link-mark="yes" title="群星《2024好听新歌42》AI调整音效【WAV分轨】"><span>群星《2024好听新歌42》AI调整音效【WAV分轨】</span></a>
</li>
</ul>
</div>
</div>
<div class="sidebar">
<div class="cloud"><h2 class="hometitle">标签云</h2><ul><a href="/search.asp?key=1080P高清&m=1">1080P高清<span>(5)</span></a><a href="/search.asp?key=高清电影&m=1">高清电影<span>(5)</span></a><a href="/search.asp?key=百度云盘&m=1">百度云盘<span>(5)</span></a><a href="/search.asp?key=网盘下载&m=1">网盘下载<span>(4)</span></a><a href="/search.asp?key=破解软件&m=1">破解软件<span>(4)</span></a><a href="/search.asp?key=绿色软件&m=1">绿色软件<span>(4)</span></a><a href="/search.asp?key=磁力链接&m=1">磁力链接<span>(3)</span></a><a href="/search.asp?key=强度天梯&m=1">强度天梯<span>(3)</span></a><a href="/search.asp?key=福利资源&m=1">福利资源<span>(2)</span></a><a href="/search.asp?key=王者荣耀&m=1">王者荣耀<span>(2)</span></a><a href="/search.asp?key=黑钻活动&m=1">黑钻活动<span>(2)</span></a><a href="/search.asp?key=WPS会员&m=1">WPS会员<span>(2)</span></a><a href="/search.asp?key=刷图排行&m=1">刷图排行<span>(1)</span></a><a href="/search.asp?key=网盘限速&m=1">网盘限速<span>(1)</span></a><a href="/search.asp?key=鬼灭之刃&m=1">鬼灭之刃<span>(1)</span></a><a href="/search.asp?key=免费韩国漫画&m=1">免费韩国漫画<span>(1)</span></a><a href="/search.asp?key=宫本重做&m=1">宫本重做<span>(1)</span></a><a href="/search.asp?key=免费动漫&m=1">免费动漫<span>(1)</span></a></ul></div>
</div>
</article>
<footer>
<p style="font-size: 14px;">友情链接:<a href="http://www.imxmx.com/" title="杰晶网络" target="_blank">杰晶网络</a> <a href="http://www.ddrfans.com/" title="DDR爱好者之家" target="_blank">DDR爱好者之家</a> <a href="http://www.nqxw.com/" title="南强小屋" target="_blank">南强小屋</a> <a href="/" title="黑松山资源网" target="_blank">黑松山资源网</a> <a href="http://www.dyhadc.com/" title="白云城资源网" target="_blank">白云城资源网</a> <a href="/sitemap1.xml">站点地图</a> <a href="/sitemap.xml">SiteMap</a></p>
<p>Design by <a href="http://m.paidiu.com">黑松山资源网</a> <a href="/">http://m.paidiu.com</a></p>
</footer>
<script src="/images/nav.js"></script>
<script type="text/javascript">
jQuery.noConflict();
jQuery(function() {
var elm = jQuery('#left_flow2');
var startPos = jQuery(elm).offset().top;
jQuery.event.add(window, "scroll", function() {
var p = jQuery(window).scrollTop();
jQuery(elm).css('position', ((p) > startPos) ? 'fixed' : '');
jQuery(elm).css('top', ((p) > startPos) ? '0' : '');
});
});
</script>
</body>
</html>