Bootstrap Snippet calculator using HTML CSS Javascript

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div id="calculator">
    <!-- Screen and clear key -->
    <div class="top">
        <span class="clear">C</span>
        <div class="screen"></div>
    </div>
    
    <div class="keys">
        <!-- operators and other keys -->
        <span>7</span>
        <span>8</span>
        <span>9</span>
        <span class="operator">+</span>
        <span>4</span>
        <span>5</span>
        <span>6</span>
        <span class="operator">-</span>
        <span>1</span>
        <span>2</span>
        <span>3</span>
        <span class="operator">÷</span>
        <span>0</span>
        <span>.</span>
        <span class="eval">=</span>
        <span class="operator">x</span>
    </div>
</div>
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/* Basic reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    
    /* Better text styling */
    font: bold 14px Arial, sans-serif;
}
/* Finally adding some IE9 fallbacks for gradients to finish things up */
/* A nice BG gradient */
html {
    height: 100%;
    background: white;
    background: radial-gradient(circle, #fff 20%, #ccc);
    background-size: cover;
}
/* Using box shadows to create 3D effects */
#calculator {
    width: 325px;
    height: auto;
    
    margin: 100px auto;
    padding: 20px 20px 9px;
    
    background: #9dd2ea;
    background: linear-gradient(#9dd2ea, #8bceec);
    border-radius: 3px;
    box-shadow: 0px 4px #009de4, 0px 10px 15px rgba(0, 0, 0, 0.2);
}
/* Top portion */
.top span.clear {
    float: left;
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// Get all the keys from document
var keys = document.querySelectorAll('#calculator span');
var operators = ['+', '-', 'x', '÷'];
var decimalAdded = false;
// Add onclick event to all the keys and perform operations
for(var i = 0; i < keys.length; i++) {
    keys[i].onclick = function(e) {
        // Get the input and button values
        var input = document.querySelector('.screen');
        var inputVal = input.innerHTML;
        var btnVal = this.innerHTML;
        
        // Now, just append the key values (btnValue) to the input string and finally use javascript's eval function to get the result
        // If clear key is pressed, erase everything
        if(btnVal == 'C') {
            input.innerHTML = '';
            decimalAdded = false;
        }
        
        // If eval key is pressed, calculate and display the result
        else if(btnVal == '=') {
            var equation = inputVal;
            var lastChar = equation[equation.length - 1];
            
            // Replace all instances of x and ÷ with * and / respectively. This can be done easily using regex and the 'g' tag which will replace all instances of the matched character/substring
            equation = equation.replace(/x/g, '*').replace(/÷/g, '/');
            
            // Final thing left to do is checking the last character of the equation. If it's an operator or a decimal, remove it
            if(operators.indexOf(lastChar) > -1 || lastChar == '.')
                equation = equation.replace(/.$/, '');
            
            if(equation)
                input.innerHTML = eval(equation);
                
            decimalAdded = false;
        }
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"calculator"
Bootstrap 3.3.0 Snippet by Opeyemi15

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"calculator" Bootstrap 3.3.0 Snippet by Opeyemi15

Related: See More

Questions / Comments:

"calculator"
Bootstrap 3.3.0 Snippet by Opeyemi15