JavaScript_test/FormEvent.html at master · andychiu923/JavaScript_test · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Form Event</title>
	<style type = "text/css">
		.highline {
			border: 3px solid red;
		}
		.hidden {
			display: none;
		}
	</style>
	<script src="jquery-3.2.1.min.js"></script>
	<script>
		$(document).ready(function() {
			$('p').addClass('hidden');
			$('#name').focus(function() {
				$(this).addClass('highline');
			}).blur(function() {
				$(this).removeClass('highline');
			});
			$('#memo').focus(function() {
				$('p').addClass('hidden');
			}).blur(function() {
				var msg = $(this).val();
				var numChar = msg.length;
				$('#counter').text(numChar);
				$('p').removeClass('hidden');
			});
		});
	</script>
</head>
<body>
	姓名: <input type="text" id="name"><hr/>
	留言:
	<textarea id="memo" cols="50" rows="5"></textarea>
	<p>字元數: <span id="counter"></span></p>
</body>
</html>