HTML-JS-CSS/formValidation.html at main · madanrajsagar/HTML-JS-CSS · GitHub

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<!DOCTYPE html>
<html>
<head>
  <title>Registration Form</title>
</head>
<body>
  <h2>Registration Form</h2>
  <form id="registrationForm">
    <label for="username">Username:</label>
    <input type="text" id="username" name="username" required><br><br>

    <label for="password">Password:</label>
    <input type="password" id="password" name="password" required><br><br>

    <label for="gender">Gender:</label>
    <input type="radio" id="male" name="gender" value="male" required  checked>
    <label for="male">Male</label>
    <input type="radio" id="female" name="gender" value="female"required >
    <label for="female">Female</label><br><br>

    <input type="submit" value="Submit" onclick ="myfun();">
  </input>
  </form>
<script>

        function myfun()
        {
            username=document.getElementById("username").value;
            password =document.getElementById("password").value;
            if (document.getElementById("male").checked)
            {
              var gender = document.getElementById("male").value;
            }
            else
            {
              var gender = document.getElementById("female").value;
            }
            if(!password || !username || !gender)
            {
                alert("please enter both things");
            }
            else{
                    alert(gender);
            }

        }
</script>
</body>
</html>