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Number Guessing Game using JavaScript

Last Updated : 22 Dec, 2023
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In this article, we will create a Number guessing game using JavaScript. The game is to guess a random number generated by a computer in the range 1 – 10 in a minimum number of Guesses. 

Prerequisites

Approach

  • HTML Structure:
    • Simple structure with a title, introductory text, input form, and a submit button.
  • CSS Styling:
    • Minimal styling for a clean and responsive layout.
  • JavaScript Logic:
    • Generates a random number between 1 and 10 using Math.random() and Math.floor().
    • Initializes a counter (guess) to track the number of user guesses.
  • User Interaction:
    • On button click, retrieves the user’s guessed number and compares it with the random number.
    • Displays appropriate alerts based on the comparison (correct guess, too high, or too low).
    • Increments the guess counter accordingly.

Example: Below is the implementation of above explained approach.

HTML




<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Number Guessing Game</title>
 
    <style>
        body {
            font-family: sans-serif;
            width: 50%;
            max-width: 800px;
            min-width: 480px;
            margin: 0 auto;
        }
    </style>
</head>
 
<body>
    <h1>Guess The Number</h1>
    <p>
        We have selected a random number
        between 1 - 10. See if you can
        guess it.
    </p>
 
    <div class="form">
        <label for="guessField">
            Enter a guess:
        </label>
         
        <input type="text" id="guessField"
            class="guessField">
         
        <input type="submit" value="Submit guess"
            class="guessSubmit" id="submitguess">
    </div>
 
    <script type="text/javascript">
 
        // Generate a Random Number
        let y = Math.floor(Math.random() * 10 + 1);
 
        // Counting the number of guesses
        // made for correct Guess
        let guess = 1;
 
        document.getElementById("submitguess").onclick = function () {
 
            // Number guessed by user   
            let x = document.getElementById("guessField").value;
 
            if (x == y) {
                alert("CONGRATULATIONS!!! YOU GUESSED IT RIGHT IN "
                    + guess + " GUESS ");
            }
 
            /* If guessed number is greater than actual number*/
            else if (x > y) {
                guess++;
                alert("OOPS SORRY!! TRY A SMALLER NUMBER");
            }
            else {
                guess++;
                alert("OOPS SORRY!! TRY A GREATER NUMBER")
            }
        }
    </script>
</body>
</html>


Output: 



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