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index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculator</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<h1>Calculator</h1>
<strong>Answer: </strong><span id="answer">0</span>
<div id="buttons">
<div class="row">
<button class="special-button">Clear</button>
<button class="special-button">Backspace</button>
</div>
<div class="row">
<button class="keypad-button">7</button>
<button class="keypad-button">8</button>
<button class="keypad-button">9</button>
<button class="operation-button">*</button>
</div>
<div class="row">
<button class="keypad-button">4</button>
<button class="keypad-button">5</button>
<button class="keypad-button">6</button>
<button class="operation-button">-</button>
</div>
<div class="row">
<button class="keypad-button">1</button>
<button class="keypad-button">2</button>
<button class="keypad-button">3</button>
<button class="operation-button">+</button>
</div>
<div class="row">
<button class="keypad-button">0</button>
<button class="keypad-button" id="decimal-button">.</button>
<button class="operation-button">/</button>
<button class="operation-button">=</button>
</div>
</div>
<script type="module">
"use strict";
import { Calculator } from "./dist/bundle.js";
const calculator = new Calculator();
const buttons = document.querySelector("#buttons");
const answerSpan = document.querySelector("#answer");
const decimalButton = document.querySelector("#decimal-button");
function updateDisplay() {
answerSpan.innerText = calculator.getDisplayString();
decimalButton.disabled = calculator.isDecimalButtonDisabledInUi();
}
updateDisplay();
buttons.addEventListener("click", (event) => {
if (event.target.tagName === "BUTTON") {
const buttonText = event.target.innerText;
calculator.handleUiButtonPressed(buttonText);
updateDisplay();
}
});
document.addEventListener("keydown", (event) => {
const key = event.key;
calculator.pressKey(key);
updateDisplay();
});
</script>
</body>
</html>