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Detailed explanation of Bootstrap's aria-label and aria-labelledby applications_javascript skills
Detailed explanation of Bootstrap's aria-label and aria-labelledby applications_javascript skills
aria-label
Under normal circumstances, the input component of the form has a corresponding label. When the input component gets focus, the screen reader will read the text in the corresponding label.
Such as:
<!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> 
But if we do not set a label for the input box, when it gains focus, the screen reader will read the value of the aria-label attribute, and the aria-label will not have a visual effect.
Such as:
<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 attribute
When the desired label text already exists in other elements, you can use aria-labelledby and set its value to the id of all read elements. As follows:
When ul gets focus, the screen reader will read: "Select your position"
<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> 
PS: If an element has both aria-labelledby and aria-label, the screen reading software will read the content of aria-labelledby first
The above content is related to the aria-label and aria-labelledby applications of Bootstrap introduced by the editor. I hope that sharing this article can help you. At the same time, thank you for your continued support of the Script House website.
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