Calculator/calaculator.html at main · upandey0/Calculator · GitHub

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<!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>Calculator</title>
    <style>
        body{
            background-color: rgba(42, 33, 33, 0.8);
        }
        #val{
            width: 810px;
            height: 3rem;
            justify-content: center;
            background-color: rgb(79, 59, 59);
            border: none;
            text-align: center;
            font-size: 2.5rem;
            color: blueviolet;
        }
        .ans{
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 30px;
            text-align: right;
        }
        #calc{
            display: flex;
            justify-content: center;
            align-items: center;
            box-sizing: border-box;
        }
        #val:focus{
            outline: none;
        }

        button{
            height: 80px;
            width: 200px;
            /* padding: 20px 80px; */
            background-color: white;
            font-size: 3rem;
            border-radius: 10px;
            box-sizing: border-box;

        }
    </style>
</head>
<body>
    <h1 style="color:#ccad20;text-align:center;">CALCULATOR</h1>
    <div id="container">
            <div class="ans"><input type="text" id="val" readonly></div>
    </div>
    <div id="calc">
        <table>
            <tr>
                <td><button>(</button></td>
                <td><button>)</button></td>
                <td><button style="background-color: #f01600; font-weight: bold; color: #ecf0f1;">C</button></td>
                <td><button>%</button></td>
            </tr>
            <tr>
                <td><button>7</button></td>
                <td><button>8</button></td>
                <td><button>9</button></td>
                <td><button>X</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>0</button></td>
                <td><button style="font-weight: bold;">.</button></td>
                <td><button>/</button></td>
                <td><button style="background-color: #25db72; font-weight: bold; color: #ecf0f1;">=</button></td>
            </tr>
        </table>
    </div>
    <script>
        let screen = document.getElementById('val'); // Taken Input Field
        let buttons = document.querySelectorAll('button'); // selected all button
        let screenValue = "";
        for(item of buttons)
        {
            item.addEventListener("click",(e)=>{
                buttonText = e.target.innerText;
                if(buttonText=="X")
                {
                    buttonText = "*";
                    screenValue +=buttonText;
                    console.log(screenValue);
                    screen.value = screenValue; // display in Input
                }
                else if(buttonText == "C"){

                    screenValue = "";
                    screen.value = screenValue;
                }
                else if(buttonText == "=")
                {
                    checkforBracket();
                }
                else{
                    screenValue += buttonText;
                    screen.value = screenValue;
                }

            });
        }

        document.addEventListener("keydown",(e)=>{
            console.log(e.which);
            if(e.shiftKey==57)
            {
                e.key = "(";
            }
            else if(e.shiftKey == 48)
            {
                e.key = ")";
            }
            else if(e.shiftKey == 53){
                e.key = "%";
            }
            if(e.keyCode == 88)
            {
                screenValue += "*";
                screen.value = screenValue;
            }

            if (
                 e.key <= 9 ||
                 e.key == "+" ||
                 e.key == "-" ||
                 e.key == "*" ||
                 e.key == "." ||
                 e.key == "/" ||
                 e.key == "%" ||
                 e.key == "(" ||
                 e.key == ")"
    ) {
        screenValue += e.key;
        screen.value = screenValue;
    }

    if(e.keyCode == 13 || e.keyCode == 187)
                {
                    checkforBracket();
                }
                else if(e.keyCode == 46)
                {
                    screenValue = "";
                    screen.value = screenValue;
                    console.clear();
                }
        });

        window.onerror =  function(){
            alert('Enter Valid Expression');
            screenValue = "";
            screen.value = screenValue;
        }

        window.onBracketMultiplication = function(){
            screenValue = addStr(screen.value,screen.value.indexof("("),"*");
            screen.value = eval(screenValue);
        }
        function addStr(str,index,stringToAdd){
            return (str.substring(0,index) + stringToAdd + str.substring(index,str.length));
        }
        function checkforBracket() {
    // Check if there's a number directly infront of a bracket
            if (
        screen.value.includes("(") &&
        !isNaN(screen.value.charAt(screen.value.indexOf("(") - 1))
             ) {
            window.onBracketMultiplication();
                return;
            } else {
            screen.value = eval(screenValue);
    }

}
    </script>
</body>
</html>