calculator/script.js at main · rizalmohamad/calculator · GitHub

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const displayHistory = document.querySelector('.display-history');
const display = document.querySelector('.display-input');
const displayResult = document.querySelector('.display-result');
const numbers = document.querySelectorAll('.number');
const operations = document.querySelectorAll('.operator');
const equal = document.querySelector('.equal');
const clearAll = document.querySelector('.all-clear');
const clearLast = document.querySelector('.clear');

let dis1Num = "";
let dis2Num = "";
let result = null;
let lastOperation = "";
let haveDot = false;

numbers.forEach((number) => {
    number.addEventListener('click', (e) => {
        if(e.target.innerText === '.' && !haveDot) {
            console.log(e.target.innerText)
            haveDot = true;
        } else if(e.target.innerText === '.' && haveDot) {
            return;
        }
        dis2Num += e.target.innerText;
        display.innerHTML = dis2Num;
    })
});

operations.forEach((operation) => {
    operation.addEventListener('click', (e) => {
        if(!dis2Num) return;
        haveDot = false;
        const operationName = e.target.innerText;
        if(dis1Num && dis2Num && lastOperation) {
            mathOperation()
        } else {
            result = parseFloat(dis2Num);
        }
        clearVar(operationName)
        lastOperation = operationName;
    })
});

function clearVar(name = "") {
    dis1Num += dis2Num + " " + name + " ";
    displayHistory.innerText = dis1Num;
    display.innerText = "";
    dis2Num = "";
    displayResult.innerText = result;
};

function mathOperation() {
    if(lastOperation === 'x') {
        result = parseFloat(result) * parseFloat(dis2Num);
    } else if(lastOperation === '+') {
        result = parseFloat(result) + parseFloat(dis2Num);
    } else if(lastOperation === '-') {
        result = parseFloat(result) - parseFloat(dis2Num);
    } else if(lastOperation === '/') {
        result = parseFloat(result) / parseFloat(dis2Num);
    } else if(lastOperation === '%') {
        result = parseFloat(result) % parseFloat(dis2Num);
    }
};

equal.addEventListener('click', () => {
    if(!dis1Num || !dis2Num) return;
    haveDot = false;
    mathOperation()
    clearVar()
    display.innerText = result;
    displayResult.innerText = "";
    dis2Num = result;
    dis1Num = "";
});

window.addEventListener('keydown', (e) => {
    console.log(e.key)
    if (
        e.key === "0" ||
        e.key === "1" ||
        e.key === "2" ||
        e.key === "3" ||
        e.key === "4" ||
        e.key === "5" ||
        e.key === "6" ||
        e.key === "7" ||
        e.key === "8" ||
        e.key === "9"
    ) {
        clickButton(e.key);
    } else if(e.key === '+' || e.key === '-' || e.key === '/' || e.key === '%') {
        clickOperation(e.key);
    } else if(e.key === '*') {
        clickOperation("x");
    } else if(e.key === 'Enter' || e.key === '=') {
        clickEqual();
    } else if(e.key === 'Backspace') {
        clickClear()
    }
});

function clickButton(key) {
    numbers.forEach((button) => {
        if(button.innerText === key) {
            button.click();
        }
    })
};

function clickOperation(key) {
    operations.forEach((operation) => {
        if(operation.innerHTML === key) {
            operation.click();
        }
    })
};

function clickEqual() {
    equal.click()
};

function clickClear() {
    clearLast.click()
};

// function clickClearAll() {
//     clearAll.click()
// };