Creating a basic calculator involves creating a user interface with buttons for numbers and operations, and using JavaScript to handle the logic of calculations. Here’s a simple implementation:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Aravind Kreshna - Calculator | JavaScript Mini Projects</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="calculator">
<input type="text" id="display" readonly>
<div id="keys">
<button onclick="appendToDisplay('+')" class="operator-btn">+</button>
<button onclick="appendToDisplay('7')">7</button>
<button onclick="appendToDisplay('8')">8</button>
<button onclick="appendToDisplay('9')">9</button>
<button onclick="appendToDisplay('-')"class="operator-btn">-</button>
<button onclick="appendToDisplay('4')">4</button>
<button onclick="appendToDisplay('5')">5</button>
<button onclick="appendToDisplay('6')">6</button>
<button onclick="appendToDisplay('*')"class="operator-btn">*</button>
<button onclick="appendToDisplay('1')">1</button>
<button onclick="appendToDisplay('2')">2</button>
<button onclick="appendToDisplay('3')">3</button>
<button onclick="appendToDisplay('/')"class="operator-btn">/</button>
<button onclick="appendToDisplay('0')">0</button>
<button onclick="appendToDisplay('.')">.</button>
<button onclick="calculate()">=</button>
<button onclick="clearDisplay()"class="operator-btn">C</button>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
CSS (styles.css)
body{
margin: 0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: hsl(0, 0%, 90%);
}
#calculator{
font-family: Arial, sans-serif;
background-color: hsl(0, 0%, 15%);
border-radius: 15px;
max-width: 400px;
overflow: hidden;
}
#display{
width: 100%;
padding: 20px;
font-size: 5rem;
text-align: left;
border: none;
background-color: hsl(0, 0%, 25%);
color: white;
}
#keys{
display: grid;
grid-template-columns: repeat(4,1fr);
gap: 10px;
padding: 25px;
}
button{
width: 75px;
height: 75px;
border-radius: 50px;
border: none;
background-color: hsl(0, 0%, 30%);
color: white;
font-size: 3rem;
font-weight: bold;
cursor: pointer;
}
button:hover{
background-color: hsl(0, 0%, 40%);
}
button:active{
background-color: hsl(0, 0%, 50%);
}
.operator-btn{
background-color: hsl(35, 100%, 55%);
}
.operator-btn:hover{
background-color: hsl(35, 100%, 65%);
}
.operator-btn:active{
background-color: hsl(35, 100%, 75%);
}
JavaScript (script.js)
const display = document.getElementById('display');
function appendToDisplay(input){
display.value += input;
}
function clearDisplay(){
display.value = "";
}
function calculate(){
try{
display.value = eval(display.value);
}
catch(error){
display.value = "Error"
}
}
Explanation
- HTML:
- The structure includes an input field for the display and buttons for the digits, operators, and actions.
- Each button has a
data-valueattribute to store its value.
- CSS:
- Basic styling for the calculator layout, including a grid layout for the buttons.
- Different styles for number buttons, operator buttons, the equal button, and the clear button.
- JavaScript:
- Event listeners are added to each button to handle the click event.
- When a button is clicked, its value is appended to the display or an appropriate action (clear, calculate) is performed.
This setup provides a simple yet functional calculator. You can extend it further by adding more advanced features like keyboard support, scientific functions, or a more sophisticated UI.
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