Build a Beautiful Calculator in HTML5 CSS3 & Javascript – Harshad Chopra

Build a Beautiful Calculator in HTML5 CSS3 & Javascript – Harshad Chopra

Hi Friends in this post we will be building a beautiful Calculator in HTML5 CSS3 & Javascript . In the below Figure we will see there is a simple GUI interface which features simple operations. All the Source code is given below. Just write the code by yourself and make some modifications to extend this application.

Requirements for building this Application:

  1. Knockout.js
  2. Calculator.min.js

Source Code

index.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Calculator</title>
    <link href="style.css" rel="stylesheet" />
</head>
<body class="body">

    <div class="calculator demo">
        <div class="u4 display">
            <div class="display-inner"><div class="display-text" data-bind="text: display"></div></div>
        </div>
        <button id="calculator-button-c" class="u1 button button-red" data-bind="click: clear">c</button>
        <button id="calculator-button-backspace" class="u1 button button-backspace button-gray" data-bind="click: backspace">⇤</button>
        <button id="calculator-button-negate" class="u1 button button-gray" data-bind="click: negate">±</button>
        <button id="calculator-button-÷" class="u1 button button-gray" data-bind="click: operator">÷</button>
        <button id="calculator-button-7" class="u1 button button-gray" data-bind="click: number">7</button>
        <button id="calculator-button-8" class="u1 button button-gray" data-bind="click: number">8</button>
        <button id="calculator-button-9" class="u1 button button-gray" data-bind="click: number">9</button>
        <button id="calculator-button-x" class="u1 button button-gray" data-bind="click: operator">x</button>
        <button id="calculator-button-4" class="u1 button button-gray" data-bind="click: number">4</button>
        <button id="calculator-button-5" class="u1 button button-gray" data-bind="click: number">5</button>
        <button id="calculator-button-6" class="u1 button button-gray" data-bind="click: number">6</button>
        <button id="calculator-button--" class="u1 button button-gray" data-bind="click: operator">-</button>
        <button id="calculator-button-1" class="u1 button button-gray" data-bind="click: number">1</button>
        <button id="calculator-button-2" class="u1 button button-gray" data-bind="click: number">2</button>
        <button id="calculator-button-3" class="u1 button button-gray" data-bind="click: number">3</button>
        <button id="calculator-button-+" class="u1 button button-gray" data-bind="click: operator">+</button>
        <button id="calculator-button-0" class="u2 button button-gray" data-bind="click: number">0</button>
        <button id="calculator-button-." class="u1 button button-gray" data-bind="click: number">.</button>
        <button id="calculator-button-=" class="u1 button button-blue" data-bind="click: operator">=</button>            
    </div>

    <script src="knockout-2.1.0.js"></script>
    <script src="calculator.js"></script>

</body>
</html>

style.css

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}
/* End of CSS Reset */




/*  ######################### 
 *	### Calculator styles ###
 *  ######################### */

/* Grid units */
.u1,
.u2,
.u3,
.u4 {
    float: left;
    margin: 3px;
}
.u1 {
    width: 40px;
}
.u2 {
    width: 86px;
}
.u3 {
    width: 132px;
}
.u4 {
    width: 178px;
}

.calculator {
	-moz-border-radius: 5px;
	-webkit-border-radius: 5px;
	border-radius: 5px;
	-moz-box-shadow: inset 0px 1px #7b839b;
	-webkit-box-shadow: inset 0px 1px #7b839b;
	box-shadow: inset 0px 1px #7b839b;
	background-color: #3C4150;
	border: 1px solid #181A20;
	float: left;
	padding: 6px;
	width: 184px;
}

.display {
	-moz-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
	-moz-box-shadow: inset 0 1px 1px #0A0B0D, 0px 1px #5E6370;
	-webkit-box-shadow: inset 0 1px 1px #0A0B0D, 0px 1px #5E6370;
	box-shadow: inset 0 1px 1px #0A0B0D, 0px 1px #5E6370;
	-webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
	background-color: #17181E;
	border: 1px solid #181A20;
	padding: 0 10px;
	text-align: right;
}
.display-text {
	color: #fff;
	font-size: 22px;
	line-height: 42px;
	overflow: hidden;
	unicode-bidi: embed;
	width: 1000px;
    float: right;
}
.display-inner {
    width: 156px;
    overflow: hidden;
}
.button {
	-moz-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
	-webkit-touch-callout: none;
	-webkit-user-select: none;
	-khtml-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	border: 1px solid #181A20;
	color: #fff;
	cursor: pointer;
	float: left;
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	font-weight: bold;
	line-height: 25px;
	padding: 0 8px;
	text-align: center;
	text-decoration: none;
	vertical-align: middle;
}
.button:active,
.button-active {
	position: relative;
	top: 1px;
}
.button:active,
.button:focus {
	outline: 0;
}
/* Mozilla fix */
button::-moz-focus-inner {
	padding: 0;
	border: 0;
}

/* Buttons styling exceptions */
.button-backspace {
	font-size: 17px;
	font-weight: normal;
}


/* Button skins */
.button-gray {
	-moz-box-shadow: inset 0px 1px #9498A3, 0 1px 1px #323643;
	-webkit-box-shadow: inset 0px 1px #9498A3, 0 1px 1px #323643;
	box-shadow: inset 0px 1px #9498A3, 0 1px 1px #323643;
	background-color: #595E6B;
	background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#656976), to(#4B505E));
	background-image: -webkit-linear-gradient(top, #656976, #4B505E);
	background-image: -o-linear-gradient(top, #656976, #4B505E);
	background-image: linear-gradient(to bottom, #656976, #4B505E);
	background-image: -moz-linear-gradient(top, #656976, #4B505E);
	background-repeat: repeat-x;
	filter: progid:dximagetransform.microsoft.gradient(startColorstr='#ff656976', endColorstr='#ff4B505E', GradientType=0);
	text-shadow: 0px -1px #181A20;
}
	.button-gray:hover {
		background-color: #666B78;
		background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#757985), to(#545867));
		background-image: -webkit-linear-gradient(top, #757985, #545867);
		background-image: -o-linear-gradient(top, #757985, #545867);
		background-image: linear-gradient(to bottom, #757985, #545867);
		background-image: -moz-linear-gradient(top, #757985, #545867);
		background-repeat: repeat-x;
		filter: progid:dximagetransform.microsoft.gradient(startColorstr='#ff757985', endColorstr='#ff545867', GradientType=0);
	}
	.button-gray.active, 
	.button-gray:active {
		-webkit-box-shadow: inset 0 1px 1px #14171E, 0px 1px #5E6370;
		-moz-box-shadow: inset 0 1px 1px #14171E, 0px 1px #5E6370;
		box-shadow: inset 0 1px 1px #14171E, 0px 1px #5E6370;
		background-color: #292D3A;
		background-image: none;
		filter: progid:dximagetransform.microsoft.gradient(enabled=false);
	}
.button-red {
	-moz-box-shadow: inset 0px 1px #CA9883, 0 1px 1px #323643;
	-webkit-box-shadow: inset 0px 1px #CA9883, 0 1px 1px #323643;
	box-shadow: inset 0px 1px #CA9883, 0 1px 1px #323643;
	background-color: #965F48;
	background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#A46E57), to(#844D37));
	background-image: -webkit-linear-gradient(top, #A46E57, #844D37);
	background-image: -o-linear-gradient(top, #A46E57, #844D37);
	background-image: linear-gradient(to bottom, #A46E57, #844D37);
	background-image: -moz-linear-gradient(top, #A46E57, #844D37);
	background-repeat: repeat-x;
	filter: progid:dximagetransform.microsoft.gradient(startColorstr='#ffA46E57', endColorstr='#ff844D37', GradientType=0);
	text-shadow: 0px -1px #58372A;
}
	.button-red:hover {
		background-color: #A26B55;
		background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#B4806A), to(#915740));
		background-image: -webkit-linear-gradient(top, #B4806A, #915740);
		background-image: -o-linear-gradient(top, #B4806A, #915740);
		background-image: linear-gradient(to bottom, #B4806A, #915740);
		background-image: -moz-linear-gradient(top, #B4806A, #915740);
		background-repeat: repeat-x;
		filter: progid:dximagetransform.microsoft.gradient(startColorstr='#ffB4806A', endColorstr='#ff915740', GradientType=0);
	}
	.button-red.active, 
	.button-red:active {
		-webkit-box-shadow: inset 0 1px 1px #2A130C, 0px 1px #5E6370;
		-moz-box-shadow: inset 0 1px 1px #2A130C, 0px 1px #5E6370;
		box-shadow: inset 0 1px 1px #2A130C, 0px 1px #5E6370;
		background-color: #472619;
		background-image: none;
		filter: progid:dximagetransform.microsoft.gradient(enabled=false);
	}
.button-blue {
	-moz-box-shadow: inset 0px 1px #BCD6FF, 0 1px 1px #323643;
	-webkit-box-shadow: inset 0px 1px #BCD6FF, 0 1px 1px #323643;
	box-shadow: inset 0px 1px #BCD6FF, 0 1px 1px #323643;
	background-color: #598FE9;
	background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#6DA1F8), to(#427BD8));
	background-image: -webkit-linear-gradient(top, #6DA1F8, #427BD8);
	background-image: -o-linear-gradient(top, #6DA1F8, #427BD8);
	background-image: linear-gradient(to bottom, #6DA1F8, #427BD8);
	background-image: -moz-linear-gradient(top, #6DA1F8, #427BD8);
	background-repeat: repeat-x;
	filter: progid:dximagetransform.microsoft.gradient(startColorstr='#ff6DA1F8', endColorstr='#ff427BD8', GradientType=0);
	text-shadow: 0px -1px #2C4E88;
}
	.button-blue:hover {
		background-color: #6E9EED;
		background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#83B0FC), to(#578ADE));
		background-image: -webkit-linear-gradient(top, #83B0FC, #578ADE);
		background-image: -o-linear-gradient(top, #83B0FC, #578ADE);
		background-image: linear-gradient(to bottom, #83B0FC, #578ADE);
		background-image: -moz-linear-gradient(top, #83B0FC, #578ADE);
		background-repeat: repeat-x;
		filter: progid:dximagetransform.microsoft.gradient(startColorstr='#ff83B0FC', endColorstr='#ff578ADE', GradientType=0);
	}
	.button-blue.active, 
	.button-blue:active {
		-webkit-box-shadow: inset 0 1px 1px #0E192E, 0px 1px #5E6370;
		-moz-box-shadow: inset 0 1px 1px #0E192E, 0px 1px #5E6370;
		box-shadow: inset 0 1px 1px #0E192E, 0px 1px #5E6370;
		background-color: #1E3357;
		background-image: none;
		filter: progid:dximagetransform.microsoft.gradient(enabled=false);
	}

calculator.js

var Calculator = function () {

    // Helper variable declarations
    var self = this,
        decimalMark = ".",
        sum = 0,
        prevOperator;

    // Define default values
    self.display = ko.observable("0");
    self.isShowingResult = ko.observable(false);

    // Callback for each number button
    self.number = function (item, event) {   
        var button = event.target.innerText || event.target.textContent;

        // If a result has been shown, make sure we
        // clear the display before displaying any new numbers
        if (self.isShowingResult()) {
            self.clearDisplay();
            self.isShowingResult(false);
        }

        // Make sure we only add one decimal mark
        if (button == decimalMark && self.display().indexOf(decimalMark) > -1)
            return;

        // Make sure that we remove the default 0 shown on the display
        // when the user press the first number button
        var newValue = (self.display() === "0" && button != decimalMark) ? button : self.display() + button; 
        // Update the display
        self.display(newValue);
    };

    // Callback for each operator button
    self.operator = function (item, event) {
        var button = event.target.innerText || event.target.textContent;
        // Only perform calculation if numbers
        // has been entered since last operator button was pressed
        if (!self.isShowingResult()) {
            // Perform calculation
            switch (prevOperator) {
                case "+":
                    sum = sum + parseFloat(self.display(), 10);
                    break;
                case "-":
                    sum = sum - parseFloat(self.display(), 10);
                    break;
                case "x":
                    sum = sum * parseFloat(self.display(), 10);
                    break;
                case "÷":
                    sum = sum / parseFloat(self.display(), 10);
                    break;
                default:
                    sum = parseFloat(self.display(), 10);
            };
        }

        // Avoid showing a result until you have at least
        // two terms to perform calculation on
        if (prevOperator)
            self.display(sum);

        // Make sure we don't try to calculate with the equal sign
        prevOperator = (button === "=") ? null : button;
        // Always set the calculator into showing result state 
        // after an operator button has been pressed
        self.isShowingResult(true);
    };

    // Callback for negating a number
    self.negate = function () {
        // Disable the negate button when showing a result
        if (self.isShowingResult() || self.display() === "0")
            return;

        var newValue = (self.display().substr(0, 1) === "-") ? self.display().substr(1) : "-" + self.display();
        self.display(newValue);
    };

    // Callback for each backspace button
    self.backspace = function (item, event) {
        // Disable backspace if the calculator is shown a result
        if (self.isShowingResult())
            return;

        // Remove the last character, and make the display zero when
        // last character is removed
        if (self.display().length > 1) {
            self.display(self.display().substr(0, self.display().length - 1));
        } else {
            self.clearDisplay();
        }
    };

    // Clear the entire calculator
    self.clear = function () {
        prevOperator = null;
        self.clearDisplay();
        sum = 0;
    };

    // Clear just the display
    self.clearDisplay = function () {
        self.display("0");
    };
};

// Apply knockout bindings
ko.applyBindings(new Calculator());

// Enable keyboard controll
(function () {
    // Key codes and their associated calculator buttons
    var calculatorKeys = {
        48: "0", 49: "1", 50: "2", 51: "3", 52: "4", 53: "5", 54: "6",
        55: "7", 56: "8", 57: "9", 96: "0", 97: "1", 98: "2", 99: "3",
        100: "4", 101: "5", 102: "6", 103: "7", 104: "8", 105: "9",
        106: "x", 107: "+", 109: "-", 110: ".", 111: "÷", 8: "backspace",
        13: "=", 46: "c", 67: "c"
    };

    // Helper function to fire an event on an element
    function fireEvent(element, event) {
        if (document.createEvent) {
            // Dispatch for firefox + others
            var evt = document.createEvent("HTMLEvents");
            evt.initEvent(event, true, true);
            return !element.dispatchEvent(evt);
        } else {
            // Dispatch for IE
            var evt = document.createEventObject();
            return element.fireEvent('on' + event, evt)
        }
    }

    // Helper functions to add/remove HTML-element classes
    // as IE didn't support the classList property prior to IE10
    function hasClass(ele, cls) {
        return ele.className.match(new RegExp('(\\s|^)' + cls + '(\\s|$)'));
    }

    function addClass(ele, cls) {
        if (!hasClass(ele, cls)) ele.className += " " + cls;
    }

    function removeClass(ele, cls) {
        if (hasClass(ele, cls)) {
            var reg = new RegExp('(\\s|^)' + cls + '(\\s|$)');
            ele.className = ele.className.replace(reg, ' ');
        }
    }

    // Callback for every key stroke
    var keycallback = function (e) {
        // Check if the key was one of our calculator keys
        if (e.keyCode in calculatorKeys) {
            // Get button-element associated with key
            var element = document.getElementById("calculator-button-" + calculatorKeys[e.keyCode]);
            // Simulate button click on keystroke
            addClass(element, "active");
            setTimeout(function () { removeClass(element, "active"); }, 100);
            // Fire click event
            fireEvent(element, "click");
        }
    }

    // Attach a keyup-event listener on the document
    if (document.addEventListener) {
        document.addEventListener('keyup', keycallback, false);
    } else if (document.attachEvent) {
        document.attachEvent('keyup', keycallback);
    }
})();

Calculator.min.js

var Calculator = function () {
    var a = this, b = 0, e;
    a.display = ko.observable("0");
    a.isShowingResult = ko.observable(!1);
    a.number = function (b, e) {
        var d = e.target.innerText;
        a.isShowingResult() && (a.clearDisplay(), a.isShowingResult(!1));
        "." == d && -1 < a.display().indexOf(".") || (d = "0" === a.display() && "." != d ? d : a.display() + d, a.display(d))
    };
    a.operator = function (c, f) {
        var d = f.target.innerText;
        if (!a.isShowingResult()) {
            switch (e) {
                case "+":
                    b += parseFloat(a.display(), 10);
                    break;
                case "-":
                    b -= parseFloat(a.display(), 10);
                    break;
                case "x":
                    b *= parseFloat(a.display(), 10);
                    break;
                case "\u00f7":
                    b /= parseFloat(a.display(), 10);
                    break;
                default:
                    b = parseFloat(a.display(), 10)
            }
        }
        e && a.display(b);
        e = "=" === d ? null : d;
        a.isShowingResult(!0)
    };
    a.negate = function () {
        if (!(a.isShowingResult() || "0" === a.display())) {
            var b = "-" === a.display().substr(0, 1) ? a.display().substr(1) : "-" + a.display();
            a.display(b)
        }
    };
    a.backspace = function () {
        a.isShowingResult() || (1 < a.display().length ? a.display(a.display().substr(0, a.display().length - 1)) : a.clearDisplay())
    };
    a.clear = function () {
        e = null;
        a.clearDisplay();
        b = 0
    };
    a.clearDisplay = function () {
        a.display("0")
    }
};
ko.applyBindings(new Calculator);
(function () {
    var a = { 48: "0", 49: "1", 50: "2", 51: "3", 52: "4", 53: "5", 54: "6", 55: "7", 56: "8", 57: "9", 96: "0", 97: "1", 98: "2", 99: "3", 100: "4", 101: "5", 102: "6", 103: "7", 104: "8", 105: "9", 106: "x", 107: "+", 109: "-", 110: ".", 111: "\u00f7", 8: "backspace", 13: "=", 46: "c", 67: "c" }, b = function (b) {
        if (b.keyCode in a) {
            var c = document.getElementById("calculator-button-" + a[b.keyCode]);
            c.className.match(/(\s|^)active(\s|$)/) || (c.className += " active");
            setTimeout(function () {
                c.className.match(/(\s|^)active(\s|$)/) && (c.className = c.className.replace(/(\s|^)active(\s|$)/, " "))
            }, 100);
            document.createEvent ? (b = document.createEvent("HTMLEvents"), b.initEvent("click", !0, !0), c.dispatchEvent(b)) : (b = document.createEventObject(), c.fireEvent("onclick", b))
        }
    };
    document.addEventListener ? document.addEventListener("keyup", b, !1) : document.attachEvent && document.attachEvent("keyup", b)
})();

Knockout.js

(function(window,document,navigator,undefined){
function m(w){throw w;}var n=void 0,p=!0,s=null,t=!1;function A(w){return function(){return w}};function E(w){function B(b,c,d){d&&c!==a.k.r(b)&&a.k.S(b,c);c!==a.k.r(b)&&a.a.va(b,"change")}var a="undefined"!==typeof w?w:{};a.b=function(b,c){for(var d=b.split("."),f=a,g=0;g<d.length-1;g++)f=f[d[g]];f[d[d.length-1]]=c};a.B=function(a,c,d){a[c]=d};a.version="2.1.0";a.b("version",a.version);a.a=new function(){function b(b,c){if("input"!==a.a.o(b)||!b.type||"click"!=c.toLowerCase())return t;var e=b.type;return"checkbox"==e||"radio"==e}var c=/^(\s|\u00A0)+|(\s|\u00A0)+$/g,d={},f={};d[/Firefox\/2/i.test(navigator.userAgent)?
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