wcag/working-examples/aria-invalid-required-fields/index.html at e338c8fd80cbe11f354c2adc3a7648e1827b439c · w3c/wcag · GitHub

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<!DOCTYPE HTML>
<html lang="en">
 <head> <title>Input Error Notification with aria-live=assertive and aria-invalid using jQuery: WCAG 2</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script>
$(document).ready(function(e) {
	$('#signup').submit(function() {
		$('#errText').html('');
$('input').removeAttr("aria-invalid");
$('label').removeAttr("class");
var eFlag = 0;
		if ($('#first').val() === '') {
			$('#first').attr("aria-invalid", "true");
$("label[for='first']").addClass('failed');
eFlag++;
		}
		if ($('#last').val() === '') {
			$('#last').attr("aria-invalid", "true");
$("label[for='last']").addClass('failed');
eFlag++;
		}
		if ($('#email').val() === '') {
			$('#email').attr("aria-invalid", "true");
$("label[for='email']").addClass('failed');
eFlag++;
		}
if (eFlag > 0) {
		$('#errText').html("Please complete  all required fields (" + eFlag + ") and retry").focus();
}
		return false;
	});
});
</script>
<style>
body{
	background:#fff;
	color:#000;
	font:100% / 1.5 sans-serif;
}
label.failed {
	border: red thin solid;
}
</style>

</head>
<body>
<h2 tabindex="-1" id="errText" aria-live="assertive"></h2>
<form name="signup" id="signup" method="post" action="#">
 <p>
    <label for="first">First Name (required)</label><br>
    <input type="text" name="first" id="first">
  </p>
  <p>
    <label for="last">Last Name (required)</label><br>
    <input type="text" name="last" id="last">
  </p>
  <p>
    <label for="email">Email (required)</label><br>
    <input type="text" name="email" id="email">
  </p>
  <p>
    <input type="submit" name="button" id="button" value="Submit">
  </p>
</form>
</body>
</html>