🌐 Basic BOM (Browser Object Model)

Last Updated: 09 Oct 2025

BOM (Browser Object Model) allows JavaScript to interact with the browser window and control browser features (like alerts, location, history, and navigator).

Hinglish Tip 🗣: BOM ka matlab hai “browser ka model” — jaise browser ka control hum JS ke through le sakte hain.

BOM Popup?

  • A popup is a window that appears on top of the current window.
  • JavaScript provides simple popup dialogs to interact with users directly in the browser.
  • These include:
    1. alert() → show message
    2. confirm() → ask yes/no question
    3. prompt() → take input from user

🔔 1. alert()

  • Displays a message box with OK button.
  • No return value.
alert("Hello User!");
alert("Welcome to JavaScript BOM Tutorial!");

Hinglish Tip 🗣: Ye sirf message dikhata hai — user koi value return nahi karta.

✅ 2. confirm()

  • Displays a dialog box with OK and Cancel buttons.
  • Returns true if OK clicked, false if Cancel clicked.
let isSure = confirm("Are you sure you want to continue?");
console.log(isSure); // true or false depending on user click

Hinglish Tip 🗣: Confirm se user ka yes/no ya true/false milta hai.

📝 3. prompt()

  • Displays a popup input box for the user to enter text.
  • Returns the entered string, or null if Cancel clicked.
let name = prompt("Enter your name:");
console.log(name);

Hinglish Tip 🗣: Browser me ek chhota input box show karta hai.

💡 Quick Practice

  1. Show an alert with "Welcome to JS BOM".
  2. Ask user "Do you like JavaScript?" using confirm() and print the result.
  3. Take user name using prompt() and greet them using console.log.
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