Calc/index.html at master · spider8/Calc · GitHub

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<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta name="theme-color" content="#73DAEB" />
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
    <title>Calc</title>
</head>

<body>
    <link rel="stylesheet" type="text/css" href="style.css">
    <div id="calc">
        <textarea type="text" v-model="expr" class="screen"></textarea>
        <div class=keyboard>
            <div class='numericKey'>
                <button type="button" class="key num">7</button>
                <button type="button" class="key num">8</button>
                <button type="button" class="key num">9</button>

                <button type="button" class="key num">4</button>
                <button type="button" class="key num">5</button>
                <button type="button" class="key num">6</button>

                <button type="button" class="key num">1</button>
                <button type="button" class="key num">2</button>
                <button type="button" class="key num">3</button>

                <button type="button" class="key num">.</button>
                <button type="button" class="key num">0</button>
                <button type="button" class="key num">=</button>
            </div>

            <div class="operationKey">
                <button type="button" class='key op'>C</button>
                <button type="button" class='key op'>/</button>
                <button type="button" class='key op'>*</button>
                <button type="button" class='key op'>-</button>
                <button type="button" class='key op'>+</button>
            </div>
        </div>
    </div>
    <script src="vue.js" charset="utf-8"></script>
    <script type="text/javascript">
        calc = new Vue({
            el: "#calc",
            data: {
                expr: "",
                isOp: false
            }
        })

        function keyPress(caracter) {
            switch (caracter) {
                case '=':
                    calc.expr = eval(calc.expr);
                    break;
                case 'C':
                    calc.expr = "";
                    break;

                case '+':
                case '-':
                case '*':
                case '/':
                    if (calc.isOp)
                        break;
                    if (calc.expr == "" && caracter != '-')
                        break;
                    calc.expr += caracter;
                    calc.isOp = true;
                    break;

                default:
                    calc.expr += caracter;
                    calc.isOp = false;
            }
        }

        buttons = document.getElementsByClassName('key');
        for (let b in buttons) {
            buttons[b].onclick = function() {
                keyPress(buttons[b].innerText);
            }
        }
    </script>
    <script>
        (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
        m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
        })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

        ga('create', 'UA-89543591-1', 'auto');
        ga('send', 'pageview');

    </script>
</body>

</html>