JavaScript-Projects/form-validation/index.html at main · amit265/JavaScript-Projects · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Simple Form Validation</title>
  <style>
    body {
      font-family: system-ui, Arial;
      background: #f9fafb;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
    form {
      background: white;
      padding: 25px 30px;
      border-radius: 12px;
      box-shadow: 0 5px 20px rgba(0,0,0,0.1);
      width: 320px;
    }
    h3 {
      text-align: center;
      margin-bottom: 15px;
    }
    input {
      width: 100%;
      padding: 10px;
      margin-bottom: 12px;
      border: 1px solid #d1d5db;
      border-radius: 5px;
    }
    button {
      width: 100%;
      background: #2563eb;
      color: white;
      border: none;
      padding: 10px;
      border-radius: 6px;
      cursor: pointer;
      font-weight: bold;
    }
    button:hover {
      background: #1e40af;
    }
    p {
      color: red;
      font-size: 13px;
      margin: 0 0 10px;
    }
  </style>
</head>
<body>
  <form id="signupForm">
    <h3>📝 Sign Up</h3>

    <input type="text" id="username" placeholder="Username">
    <p id="nameError"></p>

    <input type="email" id="email" placeholder="Email">
    <p id="emailError"></p>

    <input type="password" id="password" placeholder="Password">
    <p id="passError"></p>

    <button type="submit">Submit</button>
  </form>

  <script>
    const form = document.getElementById("signupForm");
    const username = document.getElementById("username");
    const email = document.getElementById("email");
    const password = document.getElementById("password");

    form.addEventListener("submit", (e) => {
      e.preventDefault(); // stop form from reloading
      let valid = true;

      // Reset previous error messages
      document.querySelectorAll("p").forEach(p => p.textContent = "");

      // Username validation
      if (username.value.trim() === "") {
        document.getElementById("nameError").textContent = "Username is required.";
        valid = false;
      }

      // Email validation (simple regex)
      const emailPattern = /^[^ ]+@[^ ]+\.[a-z]{2,3}$/;
      if (!email.value.match(emailPattern)) {
        document.getElementById("emailError").textContent = "Enter a valid email address.";
        valid = false;
      }

      // Password validation
      if (password.value.length < 6) {
        document.getElementById("passError").textContent = "Password must be at least 6 characters.";
        valid = false;
      }

      if (valid) {
        alert("🎉 Form submitted successfully!");
        form.reset();
      }
    });
  </script>
</body>
</html>