JavaScript validation for username and password not working in html file

I am creating a program called “Login & Sign-up Form”. The program involve Java Servlet, HTML, CSS which are working fine and JavaScript which i am having problem. I am using JavaScript to validate the username, password and email before submitting them. However, when i click on the “Submit” button, it directly goes to page showing “log @ register success” without checking the three fields. I noticed that the email filed is only checked as it will be done by the browser automatically. Please help me to solve this issue as i do not know what is the problem. Thank you very much. Below is the html code followed by css code. I also add the java servlet code too add below. Your help is much appreciated.

INDEX.HTML

<!DOCTYPE html>
<html lang="en">
    <head>
         <meta charset="UTF-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
         
         <link rel="stylesheet" href="Style.css" />
         <title>Sign in & Sign up Form</title>
    </head>
    
    <script src="https://kit.fontawesome.com/64d58efce2.js" crossorigin="anonymous" ></script>
  
    <body>
        <div class="container">
            <div class="forms-container">
            
<!---------------------------- this is for login form ------------------------------------->
                
                <div class="login-signup">
                
                    <form action="Logsuccess" class="log-in-form" method="get">
                        <h2 class="title">Log-in</h2>
                        <div class="input-field">
                            <i class="fas fa-user"></i>
                            <input type="text" name="username" placeholder="Username" />
                        </div>
                        
                        <br>
                        <span id = "user" class = "text-danger"> </span>
                        
                        <div class="input-field">
                            <i class="fas fa-lock"></i>
                            <input type="password" name="password" placeholder="Password" />
                        </div>
                        
                        <br>
                        <span id = "pass" class = "text-danger"> </span>
                        
                        
                        <input type="submit" value="Login" class="btn solid" />
                        <p class="social-text">Or Sign in with social platforms</p>
                        
                        <div class="social-media">
                            <a href="#" class="social-icon"> <i class="fab fa-facebook-f"> </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-twitter">    </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-google">     </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-linkedin-in"></i> </a>
                        </div>
                    </form>
                    
<!---------------------------- this is for signup form ------------------------------------->
                    
                    <!-- <form action="#" class="sign-up-form" method="post" onsubmit="return validation()">  -->
                    <form action="RegSuccess" class="sign-up-form" method="post">
                        <h2 class="title">Sign up</h2>
                        <div class="input-field">
                            <i class="fas fa-user"></i>
                            <input type="text" name="Username" placeholder="Username" />
                        </div>
                        
                        <br>
                        <span id = "user" class = "text-danger"> </span>
                        
                        <div class="input-field">
                            <i class="fas fa-envelope"></i>
                            <input type="email" placeholder="Email" />
                        </div>
                        
                        <br>
                        <span id = "emailAddress" class = "text-danger"> </span>
                        
                        <div class="input-field">
                            <i class="fas fa-lock"></i>
                            <input type="password" name="Password"  placeholder="Password" />
                        </div>
                        
                        <br>
                        <span id = "pass" class = "text-danger"> </span>
                                                
                        <input type="submit" class="btn" value="Sign up" />
                        <p class="social-text">Or Sign up with social platforms</p>
                        
                        <div class="social-media">
                            <a href="#" class="social-icon"> <i class="fab fa-facebook-f"> </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-twitter">    </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-google">     </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-linkedin-in"></i> </a>
                        </div>
                    </form>
                </div>
            </div>

<!---------------------------- this is in login page for asking to signup------------------------------------->

            <div class="panels-container">
                <div class="panel left-panel">
                    <div class="content">
                        <h3>Don't Have An Account ?</h3>
                        <p>
                            Your are always welcome to join us!!!
                        </p>
                        
                        <button class="btn transparent" id="sign-up-btn"> Sign up </button>
                    </div>
                    <img src="img/log.svg" class="image" alt="" />
                </div>

<!---------------------------- this is in signup page for asking to login------------------------------------->

                <div class="panel right-panel">
                    <div class="content">
                        <h3>Are You One of Us ?</h3>
                        <p>
                            Let's Log In Then !!!
                        </p>
                        
                        <button class="btn transparent" id="sign-in-btn"> Log in </button>
                    </div>
                    <img src="img/register.svg" class="image" alt="" />
                </div>
            </div>
        </div>




        <script>
            //---------------------------- this is javascript for the buttons -------------------------------------//
            const sign_in_btn = document.querySelector("#sign-in-btn");
            const sign_up_btn = document.querySelector("#sign-up-btn");
            const container = document.querySelector(".container");
            
            sign_up_btn.addEventListener("click", () => {
              container.classList.add("sign-up-mode");
            });
            
            sign_in_btn.addEventListener("click", () => {
              container.classList.remove("sign-up-mode");
            });
        
            //---------------------------- start of javascript for validation -------------------------------------//
        function validation()
        {
            var username = document.getElementById('username').value;  
            var password = document.getElementById('password').value;  
            
            //validation for username
            if (username == null || username == "")
            { 
                document.getElementById('user').innerHTMl = "Username cannot be empty";                 
                    return false;  
            }
            else if(username.length < 3 || username.length > 30)
            {  
                document.getElementById('user').innerHTMl = "Username must be at least 3 characters long.";  
                return false;  
            }
            else
            {
                document.getElementById('user').innerHTMl = "";
            }
                
                
            //validation for password
            if (password == null || password == "")
            { 
                document.getElementById('pass').innerHTMl = "Password cannot be empty";                 
                return false;  
            }
            else if(password.length <= 4 || password.length >= 20)
            {  
                document.getElementById('pass').innerHTMl = "Password must be at least 4 characters long.";  
              return false;  
            }
            else
            {
                document.getElementById('pass').innerHTMl = "";
            }
                
                
            //validation for email
            if (email == null || email == "")
            { 
                document.getElementById('emailAddress').innerHTMl = "Email cannot be empty";                    
                return false;  
            }
            else if(email.indexOf('@') <= 0)
            {  
                document.getElementById('emailAddress').innerHTMl = " @ symbol is on invalid position";  
              return false;  
            }
            else
            {
                document.getElementById('emailAddress').innerHTMl = "";
            }
        }
        //---------------------------- end of javascript for validation -------------------------------------//
            
        </script>
    
    </body>
</html>

JavaScript
​x
 
<!DOCTYPE html>
<html lang="en">
    <head>
         <meta charset="UTF-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
         
         <link rel="stylesheet" href="Style.css" />
         <title>Sign in & Sign up Form</title>
    </head>
    
    <script src="https://kit.fontawesome.com/64d58efce2.js" crossorigin="anonymous" ></script>
  
    <body>
        <div class="container">
            <div class="forms-container">
            
<!---------------------------- this is for login form ------------------------------------->
                
                <div class="login-signup">
                
                    <form action="Logsuccess" class="log-in-form" method="get">
                        <h2 class="title">Log-in</h2>
                        <div class="input-field">
                            <i class="fas fa-user"></i>
                            <input type="text" name="username" placeholder="Username" />
                        </div>
                        
                        <br>
                        <span id = "user" class = "text-danger"> </span>
                        
                        <div class="input-field">
                            <i class="fas fa-lock"></i>
                            <input type="password" name="password" placeholder="Password" />
                        </div>
                        
                        <br>
                        <span id = "pass" class = "text-danger"> </span>
                        
                        
                        <input type="submit" value="Login" class="btn solid" />
                        <p class="social-text">Or Sign in with social platforms</p>
                        
                        <div class="social-media">
                            <a href="#" class="social-icon"> <i class="fab fa-facebook-f"> </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-twitter">    </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-google">     </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-linkedin-in"></i> </a>
                        </div>
                    </form>
                    
<!---------------------------- this is for signup form ------------------------------------->
                    
                    <!-- <form action="#" class="sign-up-form" method="post" onsubmit="return validation()">  -->
                    <form action="RegSuccess" class="sign-up-form" method="post">
                        <h2 class="title">Sign up</h2>
                        <div class="input-field">
                            <i class="fas fa-user"></i>
                            <input type="text" name="Username" placeholder="Username" />
                        </div>
                        
                        <br>
                        <span id = "user" class = "text-danger"> </span>
                        
                        <div class="input-field">
                            <i class="fas fa-envelope"></i>
                            <input type="email" placeholder="Email" />
                        </div>
                        
                        <br>
                        <span id = "emailAddress" class = "text-danger"> </span>
                        
                        <div class="input-field">
                            <i class="fas fa-lock"></i>
                            <input type="password" name="Password"  placeholder="Password" />
                        </div>
                        
                        <br>
                        <span id = "pass" class = "text-danger"> </span>
                                                
                        <input type="submit" class="btn" value="Sign up" />
                        <p class="social-text">Or Sign up with social platforms</p>
                        
                        <div class="social-media">
                            <a href="#" class="social-icon"> <i class="fab fa-facebook-f"> </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-twitter">    </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-google">     </i> </a>
                            <a href="#" class="social-icon"> <i class="fab fa-linkedin-in"></i> </a>
                        </div>
                    </form>
                </div>
            </div>
​
<!---------------------------- this is in login page for asking to signup------------------------------------->
​
            <div class="panels-container">
                <div class="panel left-panel">
                    <div class="content">
                        <h3>Don't Have An Account ?</h3>
                        <p>
                            Your are always welcome to join us!!!
                        </p>
                        
                        <button class="btn transparent" id="sign-up-btn"> Sign up </button>
                    </div>
                    <img src="img/log.svg" class="image" alt="" />
                </div>
​
<!---------------------------- this is in signup page for asking to login------------------------------------->
​
                <div class="panel right-panel">
                    <div class="content">
                        <h3>Are You One of Us ?</h3>
                        <p>
                            Let's Log In Then !!!
                        </p>
                        
                        <button class="btn transparent" id="sign-in-btn"> Log in </button>
                    </div>
                    <img src="img/register.svg" class="image" alt="" />
                </div>
            </div>
        </div>
​
​
​
​
        <script>
            //---------------------------- this is javascript for the buttons -------------------------------------//
            const sign_in_btn = document.querySelector("#sign-in-btn");
            const sign_up_btn = document.querySelector("#sign-up-btn");
            const container = document.querySelector(".container");
            
            sign_up_btn.addEventListener("click", () => {
              container.classList.add("sign-up-mode");
            });
            
            sign_in_btn.addEventListener("click", () => {
              container.classList.remove("sign-up-mode");
            });
        
            //---------------------------- start of javascript for validation -------------------------------------//
        function validation()
        {
            var username = document.getElementById('username').value;  
            var password = document.getElementById('password').value;  
            
            //validation for username
            if (username == null || username == "")
            { 
                document.getElementById('user').innerHTMl = "Username cannot be empty";                 
                    return false;  
            }
            else if(username.length < 3 || username.length > 30)
            {  
                document.getElementById('user').innerHTMl = "Username must be at least 3 characters long.";  
                return false;  
            }
            else
            {
                document.getElementById('user').innerHTMl = "";
            }
                
                
            //validation for password
            if (password == null || password == "")
            { 
                document.getElementById('pass').innerHTMl = "Password cannot be empty";                 
                return false;  
            }
            else if(password.length <= 4 || password.length >= 20)
            {  
                document.getElementById('pass').innerHTMl = "Password must be at least 4 characters long.";  
              return false;  
            }
            else
            {
                document.getElementById('pass').innerHTMl = "";
            }
                
                
            //validation for email
            if (email == null || email == "")
            { 
                document.getElementById('emailAddress').innerHTMl = "Email cannot be empty";                    
                return false;  
            }
            else if(email.indexOf('@') <= 0)
            {  
                document.getElementById('emailAddress').innerHTMl = " @ symbol is on invalid position";  
              return false;  
            }
            else
            {
                document.getElementById('emailAddress').innerHTMl = "";
            }
        }
        //---------------------------- end of javascript for validation -------------------------------------//
            
        </script>
    
    </body>
</html>
​

***LOGINFAIL.HTML

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
        <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
        <title>Registration Success</title>     
    </head>

    <script src="https://kit.fontawesome.com/64d58efce2.js" crossorigin="anonymous" ></script>

    <style>
        body {
          background: #041C32;
        }
        
        #card {
          position: relative;
          width: 400px;
          display: block;
          margin: 150px auto;
          text-align: center;
          font-family: 'Source Sans Pro', sans-serif;
        }
        
        #upper-side {
          padding: 2em;
          background-color: #ECB365;
          display: block;
          color: #fff;
          border-top-right-radius: 8px;
          border-top-left-radius: 8px;
        }
        
        #checkmark {
          font-weight: lighter;
          fill: #fff;
          margin: -3.5em auto auto 20px;
        }
        
        #status {
          font-weight: lighter;
          text-transform: uppercase;
          letter-spacing: 2px;
          font-size: 1em;
          margin-top: auto;
          margin-bottom: 0;
        }
        
        #lower-side {
          padding: 2em 2em 5em 2em;
          background: #fff;
          display: block;
          border-bottom-right-radius: 8px;
          border-bottom-left-radius: 8px;
        }
        
        #message {
          margin-top: -.5em;
          color: #757575;
          letter-spacing: 1px;
        }
        
        #contBtn {
          position: relative;
          top: 1.5em;
          text-decoration: none;
          background: #064663;
          color: #fff;
          margin: auto;
          padding: .8em 3em;
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          border-radius: 25px;
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
        
        #contBtn:hover {
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
    
    </style>

    <body>      
        <section>
            <div class="rt-container">
                  <div class="col-rt-12">
                      <div class="Scriptcontent">                     
                        <div id='card' class="animated fadeIn">
                              <div id='upper-side'>
                                   <i class="fa fa-check"></i>
                                   <br>
                                   <h3 id='status'> Login Failed </h3> 
                                </div>
                              <div id='lower-side'>
                                <p id='message'>
                                  Your login has failed due to an invalid username or password <br><br>
                                  Please try again!!!!
                                </p>
                                <a href="index.html" id="contBtn">Continue</a>
                              </div>
                        </div>                 
                    </div>
                </div>
            </div>
        </section>
    </body>
</html>

JavaScript
 
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
        <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
        <title>Registration Success</title>     
    </head>
​
    <script src="https://kit.fontawesome.com/64d58efce2.js" crossorigin="anonymous" ></script>
​
    <style>
        body {
          background: #041C32;
        }
        
        #card {
          position: relative;
          width: 400px;
          display: block;
          margin: 150px auto;
          text-align: center;
          font-family: 'Source Sans Pro', sans-serif;
        }
        
        #upper-side {
          padding: 2em;
          background-color: #ECB365;
          display: block;
          color: #fff;
          border-top-right-radius: 8px;
          border-top-left-radius: 8px;
        }
        
        #checkmark {
          font-weight: lighter;
          fill: #fff;
          margin: -3.5em auto auto 20px;
        }
        
        #status {
          font-weight: lighter;
          text-transform: uppercase;
          letter-spacing: 2px;
          font-size: 1em;
          margin-top: auto;
          margin-bottom: 0;
        }
        
        #lower-side {
          padding: 2em 2em 5em 2em;
          background: #fff;
          display: block;
          border-bottom-right-radius: 8px;
          border-bottom-left-radius: 8px;
        }
        
        #message {
          margin-top: -.5em;
          color: #757575;
          letter-spacing: 1px;
        }
        
        #contBtn {
          position: relative;
          top: 1.5em;
          text-decoration: none;
          background: #064663;
          color: #fff;
          margin: auto;
          padding: .8em 3em;
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          border-radius: 25px;
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
        
        #contBtn:hover {
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
    
    </style>
​
    <body>      
        <section>
            <div class="rt-container">
                  <div class="col-rt-12">
                      <div class="Scriptcontent">                     
                        <div id='card' class="animated fadeIn">
                              <div id='upper-side'>
                                   <i class="fa fa-check"></i>
                                   <br>
                                   <h3 id='status'> Login Failed </h3> 
                                </div>
                              <div id='lower-side'>
                                <p id='message'>
                                  Your login has failed due to an invalid username or password <br><br>
                                  Please try again!!!!
                                </p>
                                <a href="index.html" id="contBtn">Continue</a>
                              </div>
                        </div>                 
                    </div>
                </div>
            </div>
        </section>
    </body>
</html>
​

REGISTERSUCCESS.HTML

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
        <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
        <title>Registration Success</title>     
    </head>

    <script src="https://kit.fontawesome.com/64d58efce2.js" crossorigin="anonymous" ></script>

    <style>
        body {
          background: #041C32;
        }
        
        #card {
          position: relative;
          width: 400px;
          display: block;
          margin: 150px auto;
          text-align: center;
          font-family: 'Source Sans Pro', sans-serif;
        }
        
        #upper-side {
          padding: 2em;
          background-color: #ECB365;
          display: block;
          color: #fff;
          border-top-right-radius: 8px;
          border-top-left-radius: 8px;
        }
        
        #checkmark {
          font-weight: lighter;
          fill: #fff;
          margin: -3.5em auto auto 20px;
        }
        
        #status {
          font-weight: lighter;
          text-transform: uppercase;
          letter-spacing: 2px;
          font-size: 1em;
          margin-top: auto;
          margin-bottom: 0;
        }
        
        #lower-side {
          padding: 2em 2em 5em 2em;
          background: #fff;
          display: block;
          border-bottom-right-radius: 8px;
          border-bottom-left-radius: 8px;
        }
        
        #message {
          margin-top: -.5em;
          color: #757575;
          letter-spacing: 1px;
        }
        
        #contBtn {
          position: relative;
          top: 1.5em;
          text-decoration: none;
          background: #064663;
          color: #fff;
          margin: auto;
          padding: .8em 3em;
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          border-radius: 25px;
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
        
        #contBtn:hover {
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
    
    </style>

    <body>      
        <section>
            <div class="rt-container">
                  <div class="col-rt-12">
                      <div class="Scriptcontent">                     
                        <div id='card' class="animated fadeIn">
                              <div id='upper-side'>
                                   <i class="fa fa-check"></i>
                                   <br>
                                   <h3 id='status'> Register Success </h3> 
                                </div>
                              <div id='lower-side'>
                                <p id='message'>
                                  Congratulations, your account has been successfully created. <br><br>
                                  Log-in to your account now !!!!
                                </p>
                                <a href="index.html" id="contBtn">Continue</a>
                              </div>
                        </div>                 
                    </div>
                </div>
            </div>
        </section>
    </body>
</html>

JavaScript
 
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
        <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
        <title>Registration Success</title>     
    </head>
​
    <script src="https://kit.fontawesome.com/64d58efce2.js" crossorigin="anonymous" ></script>
​
    <style>
        body {
          background: #041C32;
        }
        
        #card {
          position: relative;
          width: 400px;
          display: block;
          margin: 150px auto;
          text-align: center;
          font-family: 'Source Sans Pro', sans-serif;
        }
        
        #upper-side {
          padding: 2em;
          background-color: #ECB365;
          display: block;
          color: #fff;
          border-top-right-radius: 8px;
          border-top-left-radius: 8px;
        }
        
        #checkmark {
          font-weight: lighter;
          fill: #fff;
          margin: -3.5em auto auto 20px;
        }
        
        #status {
          font-weight: lighter;
          text-transform: uppercase;
          letter-spacing: 2px;
          font-size: 1em;
          margin-top: auto;
          margin-bottom: 0;
        }
        
        #lower-side {
          padding: 2em 2em 5em 2em;
          background: #fff;
          display: block;
          border-bottom-right-radius: 8px;
          border-bottom-left-radius: 8px;
        }
        
        #message {
          margin-top: -.5em;
          color: #757575;
          letter-spacing: 1px;
        }
        
        #contBtn {
          position: relative;
          top: 1.5em;
          text-decoration: none;
          background: #064663;
          color: #fff;
          margin: auto;
          padding: .8em 3em;
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.21);
          border-radius: 25px;
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
        
        #contBtn:hover {
          -webkit-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -moz-box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          box-shadow: 0px 15px 30px rgba(50, 50, 50, 0.41);
          -webkit-transition: all .4s ease;
                -moz-transition: all .4s ease;
                -o-transition: all .4s ease;
                transition: all .4s ease;
        }
    
    </style>
​
    <body>      
        <section>
            <div class="rt-container">
                  <div class="col-rt-12">
                      <div class="Scriptcontent">                     
                        <div id='card' class="animated fadeIn">
                              <div id='upper-side'>
                                   <i class="fa fa-check"></i>
                                   <br>
                                   <h3 id='status'> Register Success </h3> 
                                </div>
                              <div id='lower-side'>
                                <p id='message'>
                                  Congratulations, your account has been successfully created. <br><br>
                                  Log-in to your account now !!!!
                                </p>
                                <a href="index.html" id="contBtn">Continue</a>
                              </div>
                        </div>                 
                    </div>
                </div>
            </div>
        </section>
    </body>
</html>
​

css code

@charset "ISO-8859-1";

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700;800&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  color: #ECB365;
}

body,
input {
  font-family: "Poppins", sans-serif;
}


.container {
  position: relative;
  width: 100%;
  background-color: #041C32;
  min-height: 100vh;
  overflow: hidden;
}

.forms-container {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}

.login-signup {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  left: 75%;
  width: 50%;
  transition: 1s 0.7s ease-in-out;
  display: grid;
  grid-template-columns: 1fr;
  z-index: 5;
}

form {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 0rem 5rem;
  transition: all 0.2s 0.7s;
  overflow: hidden;
  grid-column: 1 / 2;
  grid-row: 1 / 2;
}

form.sign-up-form {
  opacity: 0;
  z-index: 1;
}

form.log-in-form {
  z-index: 2;
}

.title {
  font-size: 2.2rem;
  color: #ECB365;
  margin-bottom: 10px;
}

.input-field {
  max-width: 380px;
  width: 100%;
  background-color: #ECB365;
  margin: 10px 0;
  height: 55px;
  border-radius: 55px;
  display: grid;
  grid-template-columns: 15% 85%;
  padding: 0 0.4rem;
  position: relative;
}

.input-field i {
  text-align: center;
  line-height: 55px;
  color: #444444;
  transition: 0.5s;
  font-size: 1.1rem;
}

.input-field input {
  background: none;
  outline: none;
  border: none;
  line-height: 1;
  font-weight: 600;
  font-size: 1.1rem;
  color: #041C32;
}

.input-field input::placeholder {
  color: #444444;
  font-weight: 500;
}

.social-text {
  padding: 0.7rem 0;
  font-size: 1rem;
}

.social-media {
  display: flex;
  justify-content: center;
}

.social-icon {
  height: 46px;
  width: 46px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 0.45rem;
  color: #ECDBBA;
  border-radius: 50%;
  border: 1px solid #fff;
  text-decoration: none;
  font-size: 1.1rem;
  transition: 0.3s;
}


.social-icon:hover {
  color: #ECB365;
  border-color: #ECB365;
}

.btn {
  width: 150px;
  background-color: #064663;
  border: none;
  outline: none;
  height: 49px;
  border-radius: 49px;
  color: #fff;
  text-transform: uppercase;
  font-weight: 600;
  margin: 10px 0;
  cursor: pointer;
  transition: 0.5s;
}

.btn:hover {
  background-color: #4d84e2;
}
.panels-container {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

.container:before {
  content: "";
  position: absolute;
  height: 2000px;
  width: 2000px;
  top: -10%;
  right: 48%;
  transform: translateY(-50%);
  background-image: linear-gradient(-45deg, #064663 0%, #064663 100%);
  transition: 1.8s ease-in-out;
  border-radius: 50%;
  z-index: 6;
}

.image {
  width: 100%;
  transition: transform 1.1s ease-in-out;
  transition-delay: 0.4s;
}

.panel {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-around;
  text-align: center;
  z-index: 6;
}

.left-panel {
  pointer-events: all;
  padding: 3rem 17% 2rem 12%;
}

.right-panel {
  pointer-events: none;
  padding: 3rem 12% 2rem 17%;
}

.panel .content {
  color: #fff;
  transition: transform 0.9s ease-in-out;
  transition-delay: 0.6s;
}

.panel h3 {
  font-weight: 600;
  line-height: 1;
  font-size: 1.5rem;
}

.panel p {
  font-size: 0.95rem;
  padding: 0.7rem 0;
}

.btn.transparent {
  margin: 0;
  background: #041C32;
  /*border: 2px solid #fff;*/
  width: 130px;
  height: 41px;
  font-weight: 600;
  font-size: 0.8rem;
}

.btn.transparent:hover {
  background-color: #4d84e2;
}

.right-panel .image,
.right-panel .content {
  transform: translateX(800px);
}

/* ANIMATION */

.container.sign-up-mode:before {
  transform: translate(100%, -50%);
  right: 52%;
}

.container.sign-up-mode .left-panel .image,
.container.sign-up-mode .left-panel .content {
  transform: translateX(-800px);
}

.container.sign-up-mode .login-signup {
  left: 25%;
}

.container.sign-up-mode form.sign-up-form {
  opacity: 1;
  z-index: 2;
}

.container.sign-up-mode form.log-in-form {
  opacity: 0;
  z-index: 1;
}

.container.sign-up-mode .right-panel .image,
.container.sign-up-mode .right-panel .content {
  transform: translateX(0%);
}

.container.sign-up-mode .left-panel {
  pointer-events: none;
}

.container.sign-up-mode .right-panel {
  pointer-events: all;
}

@media (max-width: 870px) {
  .container {
    min-height: 800px;
    height: 100vh;
  }
  .login-signup {
    width: 100%;
    top: 95%;
    transform: translate(-50%, -100%);
    transition: 1s 0.8s ease-in-out;
  }

  .login-signup,
  .container.sign-up-mode .login-signup {
    left: 50%;
  }

  .panels-container {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 2fr 1fr;
  }

  .panel {
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    padding: 2.5rem 8%;
    grid-column: 1 / 2;
  }

  .right-panel {
    grid-row: 3 / 4;
  }

  .left-panel {
    grid-row: 1 / 2;
  }

  .image {
    width: 200px;
    transition: transform 0.9s ease-in-out;
    transition-delay: 0.6s;
  }

  .panel .content {
    padding-right: 15%;
    transition: transform 0.9s ease-in-out;
    transition-delay: 0.8s;
  }

  .panel h3 {
    font-size: 1.2rem;
  }

  .panel p {
    font-size: 0.7rem;
    padding: 0.5rem 0;
  }

  .btn.transparent {
    width: 110px;
    height: 35px;
    font-size: 0.7rem;
  }

  .container:before {
    width: 1500px;
    height: 1500px;
    transform: translateX(-50%);
    left: 30%;
    bottom: 68%;
    right: initial;
    top: initial;
    transition: 2s ease-in-out;
  }

  .container.sign-up-mode:before {
    transform: translate(-50%, 100%);
    bottom: 32%;
    right: initial;
  }

  .container.sign-up-mode .left-panel .image,
  .container.sign-up-mode .left-panel .content {
    transform: translateY(-300px);
  }

  .container.sign-up-mode .right-panel .image,
  .container.sign-up-mode .right-panel .content {
    transform: translateY(0px);
  }

  .right-panel .image,
  .right-panel .content {
    transform: translateY(300px);
  }

  .container.sign-up-mode .login-signup {
    top: 5%;
    transform: translate(-50%, 0);
  }
}

@media (max-width: 570px) {
  form {
    padding: 0 1.5rem;
  }

  .image {
    display: none;
  }
  .panel .content {
    padding: 0.5rem 1rem;
  }
  .container {
    padding: 1.5rem;
  }

  .container:before {
    bottom: 72%;
    left: 50%;
  }

  .container.sign-up-mode:before {
    bottom: 28%;
    left: 50%;
  }
}

JavaScript
 
@charset "ISO-8859-1";
​
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700;800&display=swap");
​
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  color: #ECB365;
}
​
body,
input {
  font-family: "Poppins", sans-serif;
}
​
​
.container {
  position: relative;
  width: 100%;
  background-color: #041C32;
  min-height: 100vh;
  overflow: hidden;
}
​
.forms-container {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}
​
.login-signup {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  left: 75%;
  width: 50%;
  transition: 1s 0.7s ease-in-out;
  display: grid;
  grid-template-columns: 1fr;
  z-index: 5;
}
​
form {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 0rem 5rem;
  transition: all 0.2s 0.7s;
  overflow: hidden;
  grid-column: 1 / 2;
  grid-row: 1 / 2;
}
​
form.sign-up-form {
  opacity: 0;
  z-index: 1;
}
​
form.log-in-form {
  z-index: 2;
}
​
.title {
  font-size: 2.2rem;
  color: #ECB365;
  margin-bottom: 10px;
}
​
.input-field {
  max-width: 380px;
  width: 100%;
  background-color: #ECB365;
  margin: 10px 0;
  height: 55px;
  border-radius: 55px;
  display: grid;
  grid-template-columns: 15% 85%;
  padding: 0 0.4rem;
  position: relative;
}
​
.input-field i {
  text-align: center;
  line-height: 55px;
  color: #444444;
  transition: 0.5s;
  font-size: 1.1rem;
}
​
.input-field input {
  background: none;
  outline: none;
  border: none;
  line-height: 1;
  font-weight: 600;
  font-size: 1.1rem;
  color: #041C32;
}
​
.input-field input::placeholder {
  color: #444444;
  font-weight: 500;
}
​
.social-text {
  padding: 0.7rem 0;
  font-size: 1rem;
}
​
.social-media {
  display: flex;
  justify-content: center;
}
​
.social-icon {
  height: 46px;
  width: 46px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0 0.45rem;
  color: #ECDBBA;
  border-radius: 50%;
  border: 1px solid #fff;
  text-decoration: none;
  font-size: 1.1rem;
  transition: 0.3s;
}
​
​
.social-icon:hover {
  color: #ECB365;
  border-color: #ECB365;
}
​
.btn {
  width: 150px;
  background-color: #064663;
  border: none;
  outline: none;
  height: 49px;
  border-radius: 49px;
  color: #fff;
  text-transform: uppercase;
  font-weight: 600;
  margin: 10px 0;
  cursor: pointer;
  transition: 0.5s;
}
​
.btn:hover {
  background-color: #4d84e2;
}
.panels-container {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}
​
.container:before {
  content: "";
  position: absolute;
  height: 2000px;
  width: 2000px;
  top: -10%;
  right: 48%;
  transform: translateY(-50%);
  background-image: linear-gradient(-45deg, #064663 0%, #064663 100%);
  transition: 1.8s ease-in-out;
  border-radius: 50%;
  z-index: 6;
}
​
.image {
  width: 100%;
  transition: transform 1.1s ease-in-out;
  transition-delay: 0.4s;
}
​
.panel {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: space-around;
  text-align: center;
  z-index: 6;
}
​
.left-panel {
  pointer-events: all;
  padding: 3rem 17% 2rem 12%;
}
​
.right-panel {
  pointer-events: none;
  padding: 3rem 12% 2rem 17%;
}
​
.panel .content {
  color: #fff;
  transition: transform 0.9s ease-in-out;
  transition-delay: 0.6s;
}
​
.panel h3 {
  font-weight: 600;
  line-height: 1;
  font-size: 1.5rem;
}
​
.panel p {
  font-size: 0.95rem;
  padding: 0.7rem 0;
}
​
.btn.transparent {
  margin: 0;
  background: #041C32;
  /*border: 2px solid #fff;*/
  width: 130px;
  height: 41px;
  font-weight: 600;
  font-size: 0.8rem;
}
​
.btn.transparent:hover {
  background-color: #4d84e2;
}
​
.right-panel .image,
.right-panel .content {
  transform: translateX(800px);
}
​
/* ANIMATION */
​
.container.sign-up-mode:before {
  transform: translate(100%, -50%);
  right: 52%;
}
​
.container.sign-up-mode .left-panel .image,
.container.sign-up-mode .left-panel .content {
  transform: translateX(-800px);
}
​
.container.sign-up-mode .login-signup {
  left: 25%;
}
​
.container.sign-up-mode form.sign-up-form {
  opacity: 1;
  z-index: 2;
}
​
.container.sign-up-mode form.log-in-form {
  opacity: 0;
  z-index: 1;
}
​
.container.sign-up-mode .right-panel .image,
.container.sign-up-mode .right-panel .content {
  transform: translateX(0%);
}
​
.container.sign-up-mode .left-panel {
  pointer-events: none;
}
​
.container.sign-up-mode .right-panel {
  pointer-events: all;
}
​
@media (max-width: 870px) {
  .container {
    min-height: 800px;
    height: 100vh;
  }
  .login-signup {
    width: 100%;
    top: 95%;
    transform: translate(-50%, -100%);
    transition: 1s 0.8s ease-in-out;
  }
​
  .login-signup,
  .container.sign-up-mode .login-signup {
    left: 50%;
  }
​
  .panels-container {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 2fr 1fr;
  }
​
  .panel {
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    padding: 2.5rem 8%;
    grid-column: 1 / 2;
  }
​
  .right-panel {
    grid-row: 3 / 4;
  }
​
  .left-panel {
    grid-row: 1 / 2;
  }
​
  .image {
    width: 200px;
    transition: transform 0.9s ease-in-out;
    transition-delay: 0.6s;
  }
​
  .panel .content {
    padding-right: 15%;
    transition: transform 0.9s ease-in-out;
    transition-delay: 0.8s;
  }
​
  .panel h3 {
    font-size: 1.2rem;
  }
​
  .panel p {
    font-size: 0.7rem;
    padding: 0.5rem 0;
  }
​
  .btn.transparent {
    width: 110px;
    height: 35px;
    font-size: 0.7rem;
  }
​
  .container:before {
    width: 1500px;
    height: 1500px;
    transform: translateX(-50%);
    left: 30%;
    bottom: 68%;
    right: initial;
    top: initial;
    transition: 2s ease-in-out;
  }
​
  .container.sign-up-mode:before {
    transform: translate(-50%, 100%);
    bottom: 32%;
    right: initial;
  }
​
  .container.sign-up-mode .left-panel .image,
  .container.sign-up-mode .left-panel .content {
    transform: translateY(-300px);
  }
​
  .container.sign-up-mode .right-panel .image,
  .container.sign-up-mode .right-panel .content {
    transform: translateY(0px);
  }
​
  .right-panel .image,
  .right-panel .content {
    transform: translateY(300px);
  }
​
  .container.sign-up-mode .login-signup {
    top: 5%;
    transform: translate(-50%, 0);
  }
}
​
@media (max-width: 570px) {
  form {
    padding: 0 1.5rem;
  }
​
  .image {
    display: none;
  }
  .panel .content {
    padding: 0.5rem 1rem;
  }
  .container {
    padding: 1.5rem;
  }
​
  .container:before {
    bottom: 72%;
    left: 50%;
  }
​
  .container.sign-up-mode:before {
    bottom: 28%;
    left: 50%;
  }
}
​

RegSucess.java

package com.assignmentwpj;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;



public class RegSuccess extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegSuccess() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Servlet#init(ServletConfig)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at : ").append(request.getContextPath());
    
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            response.setContentType("text/html");
          String Username = request.getParameter("Username");
            String Password = request.getParameter("Password");
        
            ServletContext context = getServletContext();
            
            context.setAttribute("Username", Username);
            context.setAttribute("Password", Password);
        
             
            
            
             RequestDispatcher req = request.getRequestDispatcher("registersuccess.html");
            req.forward(request, response);
            
        
    }
        
}

JavaScript
 
package com.assignmentwpj;
​
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
​
​
​
public class RegSuccess extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public RegSuccess() {
        super();
        // TODO Auto-generated constructor stub
    }
​
    /**
     * @see Servlet#init(ServletConfig)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at : ").append(request.getContextPath());
    
    }
​
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            response.setContentType("text/html");
          String Username = request.getParameter("Username");
            String Password = request.getParameter("Password");
        
            ServletContext context = getServletContext();
            
            context.setAttribute("Username", Username);
            context.setAttribute("Password", Password);
        
             
            
            
             RequestDispatcher req = request.getRequestDispatcher("registersuccess.html");
            req.forward(request, response);
            
        
    }
        
}
​

LogSucess.java

package com.assignmentwpj;


import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;





public class Logsuccess extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Logsuccess() {
        super();
        // TODO Auto-generated constructor stub
    }

    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        PrintWriter writer = response.getWriter();
        ServletContext context = getServletContext();
        
        String UserName =(String)context.getAttribute("Username");
        String PassWord =(String)context.getAttribute("Password");
        
        if(username.equals(UserName) && password.equals(PassWord))
        {
    
            RequestDispatcher req = request.getRequestDispatcher("loginsuccess.html");
            req.forward(request, response);
        }
        else
        {
            RequestDispatcher req = request.getRequestDispatcher("LoginFail.html");
            req.forward(request, response);
        }
        
        
        
}
    
}

JavaScript
 
package com.assignmentwpj;
​
​
import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
​
​
​
​
​
public class Logsuccess extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Logsuccess() {
        super();
        // TODO Auto-generated constructor stub
    }
​
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        PrintWriter writer = response.getWriter();
        ServletContext context = getServletContext();
        
        String UserName =(String)context.getAttribute("Username");
        String PassWord =(String)context.getAttribute("Password");
        
        if(username.equals(UserName) && password.equals(PassWord))
        {
    
            RequestDispatcher req = request.getRequestDispatcher("loginsuccess.html");
            req.forward(request, response);
        }
        else
        {
            RequestDispatcher req = request.getRequestDispatcher("LoginFail.html");
            req.forward(request, response);
        }
        
        
        
}
    
}
​

Answer

In addition to Jon P’s answer adding “required” in your html like:

<input type="password" name="password" placeholder="Password" required/>

JavaScript
 
<input type="password" name="password" placeholder="Password" required/>
​

will make it a required field for submission, this wont fix the validation problem but right now you would not need to give any response to continue

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Answer