js-series/14-Forms-Handling-Validation.html at main · jdcodebase/js-series · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>14-Forms-Handling-Validation</title>

    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        height: 100vh;
        display: flex;
        justify-content: center;
        align-items: center;
      }

      form {
        width: 50%;
        padding: 35px 0;
        border: 1px solid #000;
        border-radius: 5px;
      }

      input {
        display: block;
        width: 70%;
        margin: auto;
        padding: 5px 10px;
        font-size: 18px;
        border: 1px solid #000;
        border-radius: 5px;
      }

      button {
        display: block;
        width: 50%;
        margin: 0 auto;
        padding: 10px;
        background-color: #000;
        color: #fff;
        border-radius: 5px;
        cursor: pointer;
      }

      #error {
        width: fit-content;
        margin: 10px auto;
        padding: 5px 20px;
        background-color: rgb(209, 64, 64);
        color: #fff;
        font-size: 20px;
        text-align: center;
      }
    </style>
  </head>

  <body>
    <form id="signupForm">
      <input type="text" id="username" placeholder="Enter username" />
      <br /><br />

      <input type="email" id="email" placeholder="Enter email" />
      <br /><br />

      <input type="password" id="password" placeholder="Enter password" />
      <br /><br />

      <button type="submit">Sign Up</button>

      <p id="error"></p>
    </form>

    <script>
      // Selecting the form element using its ID
      const form = document.getElementById("signupForm");

      // Selecting the paragraph element where error messages will be shown
      const error = document.getElementById("error");

      // Adding a submit event listener to the form
      form.addEventListener("submit", function (event) {
        // Prevents the default form behavior (page reload)
        event.preventDefault();

        // Getting values entered by the user
        const username = document.getElementById("username").value;
        const email = document.getElementById("email").value;
        const password = document.getElementById("password").value;

        // Printing input values in console (for debugging / learning)
        console.log(username, email, password);

        // Clearing any previous error message
        error.textContent = "";

        // Validation: Check if username is empty
        if (username === "") {
          error.textContent = "Username is required";
          return; // Stop further execution
        }

        // Validation: Check if email is empty
        if (email === "") {
          error.textContent = "Email is required";
          return;
        }

        // Validation: Check password length
        if (password.length < 6) {
          error.textContent = "Password must be at least 6 characters";
          return;
        }

        // If all validations pass
        alert("Form Submitted Successfully");

        // Logging success message in console
        console.log("Form Submitted");
      });
    </script>
  </body>
</html>