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script.js
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script.js
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var keys = document.querySelectorAll("#calc span");
var operators = ["+", "-", "x", "÷"];
var decimalAdded = false;
for (var i = 0; i < keys.length; i++) {
keys[i].onclick = function (e) {
var input = document.querySelector(".display");
var inputVal = input.innerHTML;
var btnVal = this.innerHTML;
if (btnVal == "C") {
input.innerHTML = "";
decimalAdded = false;
} else if (btnVal == "=") {
var equation = inputVal;
var lastChar = equation[equation.length - 1];
equation = equation.replace(/x/g, "*").replace(/÷/g, "/");
if (operators.indexOf(lastChar) > -1 || lastChar == ".")
equation = equation.replace(/.$/, "");
if (equation) input.innerHTML = eval(equation);
decimalAdded = false;
} else if (operators.indexOf(btnVal) > -1) {
var lastChar = inputVal[inputVal.length - 1];
if (inputVal != "" && operators.indexOf(lastChar) == -1)
input.innerHTML += btnVal;
else if (inputVal == "" && btnVal == "-") input.innerHTML += btnVal;
if (operators.indexOf(lastChar) > -1 && inputVal.length > 1) {
input.innerHTML = inputVal.replace(/.$/, btnVal);
}
decimalAdded = false;
} else if (btnVal == ".") {
if (!decimalAdded) {
input.innerHTML += btnVal;
decimalAdded = true;
}
} else {
input.innerHTML += btnVal;
}
// prevent page jumps
e.preventDefault();
};
}
const toggleSwitch = document.querySelector(
'.theme-switch input[type="checkbox"]'
);
function switchTheme(e) {
if (e.target.checked) {
document.documentElement.setAttribute("data-theme", "dark");
} else {
document.documentElement.setAttribute("data-theme", "light");
}
}
toggleSwitch.addEventListener("change", switchTheme, false);