Untitled

<!DOCTYPE html>
<html>
<head>
	<title>BTVN2</title>
	<meta charset="utf-8">
	<script type="text/javascript" src="jquery/jquery-3.1.1.js"></script>
	<script type="text/javascript">
		$(document).ready(function(){
			var Username=$("#Username").val();
			var Password=$("#Password").val();
			var RePassword=$("#RePassword").val();
			var FullName=$("#FullName").val();
			var Email=$("#Email").val();
		if (Username.length<6) {
			$("#error").html("username it nhat phai co 6 ki tu");
			$("#Username").forcus();
			return false;
		}
		if (Password.length<1) {
			$("#error").html("Password khong duoc de trong");
			$("#Password").forcus();
			return false;
		}
		if ( RePassword != Password) {
			$("#error").html("Nhap lai sai");
			$("#RePassword").forcus();
			return false;
		}
		if (FullName<1) {
			$("#error").html("FullName khong duoc de trong");
			$("#username").forcus();
			return false;
		}
		if (Email.indexOf("@")) {
			$("#error").html("Email khong dung dinh dang");
			$("#Email").forcus();
			return false;
		}
		alert("Ban da dang ki xong.");


		})
	</script>

	<style type="text/css">

		input{
			width: 400px;
			height: 30px;
			margin: 20px;
		}
	</style>
</head>
<body>
	<form>
		<fieldset style="text-align: center;padding:10px;" >
		<legend>Thông tin dang kí</legend>
		<input id="Username" type="text" name="Username" placeholder="User name" ><br>
		<input id="Password" type="Password" name="Password" placeholder="Password(khong duoc rong) " ><br>
		<input id="RePassword" type="Password" name="RePassword" placeholder="RePassword " ><br>
		<input id="FullName" type="text" name="FullName" placeholder="FullName"><br>
		<input id="Email" type="text" name="Email" placeholder="Email"><br>
		<button id="Submit" type="submit" name="submit" >Submit</button>
		<div id="error" style="color: red;"></div>
		</fieldset>

	</form>

</body>
</html>