javascript_tutorial/javascriptTutorial.html at main · Schminat000/javascript_tutorial · GitHub

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<!--javascriptTutorial.html-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Javascript Tutorial</title>

    <!--This is the Javascript for the calcultor which
        utilizes the JQuery library.-->
        <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
        <script>

            // Defines a function to handle the calculating part of the
            // calculator.
            $(document).ready(function()
            {
                // Defines the variables.
                var num1 = "";
                var num2 = "";
                var operator = "";

                // Defines the clear function to clear the text.
                function clear()
                {
                    num1 = "";
                    num2 = "";
                    operator = "";
                    $("#result").text("");
                }

                // Defines the calculate function to do the calculations.
                function calculate()
                {
                    var result = 0;

                    // Uses a switch case function to handle the operators.
                    switch (operator)
                    {
                        case "+":
                            result = parseFloat(num1) + parseFloat(num2);
                            break;
                        case "-":
                            result = parseFloat(num1) - parseFloat(num2);
                            break;
                        case "*":
                            result = parseFloat(num1) * parseFloat(num2);
                            break;
                        case "/":
                            result = parseFloat(num1) / parseFloat(num2);
                            break;
                    }
                    $("#result").text(result);
                }

                // When a button is clicked, it runs a function.
                $("button").click(function()
                {
                    // Clears the text.
                    var val = $(this).text();
                    if (val == "C")
                    {
                        clear();
                    }

                    // Displays operators.
                    else if (val == "+" || val == "-" || val == "*" || val == "/")
                    {
                        operator = val;
                    }

                    // Displays the first number.
                    else if (operator == "")
                    {
                        num1 += val;
                        $("#result").text(num1);
                    }

                    // Displays the second number.
                    else
                    {
                        num2 += val;
                        $("#result").text(num2);
                    }

                    // If the first number, second number, and third number aren't
                    // empty, then it runs the calculator.
                    if (num1 !== "" && num2 !== "" && operator !== "")
                    {
                        calculate();
                    }
                });
            });
        </script>

        <!--This is the Javascript for finding a factorial.-->
        <script>

            // Defines a function to process and display results.
            function calculateFactorial()
            {
                const num = parseInt(document.getElementById("num").value);
                const output = document.getElementById("factorialOutput");

                // Determines if the number entered is an actual number.
                if (isNaN(num))
                {
                    output.innerHTML = "Please enter a valid number.";
                    return;
                }

                // Determines if the number is negative.
                if (num < 0)
                {
                    output.innerHTML = "Factorial is not defined for negative numbers.";
                    return;
                }
                output.innerHTML = `Factorial of ${num} is ${factorial(num)}.`;
            }

                // Defines the factorial function.
                function factorial(n)
                {
                    if (n == 0)
                    {
                        return 1;
                    }
                    else
                    {
                        return n * factorial(n - 1);
                    }
                }
        </script>

        <!--This is the Javascript for arrays.-->
        <script>
            // Define an array of numbers.
            const numbers = [1, 2, 3, 4, 5];

            // Modifies the array by adding a number.
            numbers.push(6);

            // Modifies the array by removing a specified number.
            numbers.splice(2, 1);

            // Define a function to display the numbers in the array.
            function showNumbers()
            {
                const outputDiv = document.getElementById("arrayOutput");
                outputDiv.innerHTML = 'The numbers are: ' + numbers.join(", ");
            }
        </script>
</head>
<body>
    <!--This creates the calculator buttons and displays the results.-->
    <h1>Calculator</h1>
    <div id="calculator">
        <div id="result"></div>
        <table>
        <tr>
            <td><button>7</button></td>
            <td><button>8</button></td>
            <td><button>9</button></td>
            <td><button>+</button></td>
        </tr>
        <tr>
            <td><button>4</button></td>
            <td><button>5</button></td>
            <td><button>6</button></td>
            <td><button>-</button></td>
        </tr>
        <tr>
            <td><button>1</button></td>
            <td><button>2</button></td>
            <td><button>3</button></td>
            <td><button>*</button></td>
        </tr>
        <tr>
            <td><button>C</button></td>
            <td><button>0</button></td>
            <td><button>.</button></td>
            <td><button>=</button></td>
            <td><button>/</button></td>
        </tr>
        </table>
    </div>

    <br>

    <!--This creates the factorial calculator button and displays the results.-->
    <h1>Factorial Calculator</h1>
    <div>
        <label for="num">Enter a number:</label>
        <input type="number" id="num">
        <br>
        <button onclick="calculateFactorial()">Calculate Factorial</button>
        <p id="factorialOutput"></p>
    </div>

    <br>

    <!--This creates the array example and displays the results.-->
    <h1>Array Example</h1>
    <div>
        <p>Click the button to display the numbers stored in the array:</p>
        <button onclick="showNumbers()">Show Numbers</button>
        <div id="arrayOutput"></div>
    </div>
</body>
</html>