📄 login.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<title>
Login
</title>
<body>
<form action="manage_let" method="get" name="form1" onSubmit="return on_Submit()">
<a href="index.jsp">Back To Main</a><br><br>Login First!<br>
Username: <input type="text" name="username"><br>
Password: <input type="password" name="password"><br>
<input type="submit" name="submit" value="submit">
<script language="javascript" type="text/javascript" >
function ltrim(s){
return s.replace( /^\s*/, "");
}
function rtrim(s){
return s.replace( /\s*$/, "");
}
function trim(s){
return rtrim(ltrim(s));
}
function on_Submit(){
if(form1.username.value==""||trim(form1.username.value)==""){
alert("Username cannot be null!");
form1.username.focus();
return false;
}
if(form1.password.value==""||trim(form1.password.value)==""){
alert("Password cannot be null!");
form1.password.focus();
return false;
}
return true;
}
</script>
<br></form>
</body>
</html>
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