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Bắt sự kiện checkbox trong javascript - Freetuts
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Bắt sự kiện checkbox trong javascript
Cho một checkbox, hãy viết chương trình xử lý khi người dùng thay đổi trạng thái của checkbox từ uncheck sang checked thì thông báo là "bạn vừa chọn checkbox này", và ngược lại thì thông báo là "bạn vừa bỏ chọn checkbox này".
Bài viết này được đăng tại freetuts.net , không được copy dưới mọi hình thức.
Thực ra trong Javascript không hề có sự kiện checked
hay unchecked
mà chỉ có sự kiện onclick
hoặc onchange
. Như trong trường hợp này thì chúng ta sẽ sử dụng sự kiện onclick
, khi người dùng click vào checkbox thì ta sẽ kiểm tra trạng thái của checkbox, nếu checked = true
thì tức là đã chọn và checked = false
tức là bỏ chọn.
Đề bài hơi khó hiểu nên mình sẽ làm ví dụ hỏi các thành viên có thích blog freetuts.net không nhé :)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Javascript Example</title>
</head>
<body>
<h2>Bắt sự kiện checkbox trong Javascript</h2>
<p>Viết chương trình bắt sự kiện check và uncheck của Javascript.</p>
<input type="checkbox" id="action" value="1"/> <label>Bạn có thích blog freetuts.net không?</label>
<script language="javascript">
document.getElementById('action').onclick = function(e){
if (this.checked){
alert("Bạn vừa thích freetuts.net");
}
else{
alert("Bạn vừa bỏ thích freetuts.net");
}
};
</script>
</body>
</html>
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