js-function-demo/index.html at master · gc-codes/js-function-demo · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <title>JS Demo</title>
    </head>

    <body>
        <!-- Document Object Model / DOM -->
        <div id="calculator">
            <input id="firstNumber" type="text" placeholder="First Number">
            <br/>
            <br/>
            <input id="secondNumber" type="text" placeholder="Second Number">
            <br/>
            <br/>
            <input type="button" onclick="ram()" value="Add">
            <input type="button" onclick="shyam()" value="Substract">
            <br/>
            <div id="resultDiv"></div>
        </div>

        <script>
            // get reference to the objects or DOM elements
            debugger;
            var firstNumberInputTextElement = document.getElementById("firstNumber");
            var secondNumberInputTextElement = document.getElementById("secondNumber");
            var resultDivElement = document.getElementById("resultDiv");

            // event driven programming
            function ram() {
                debugger;
                var firstNumber = parseInt(firstNumberInputTextElement.value);
                var secondNumber = parseInt(secondNumberInputTextElement.value);

                // DOM manipulation
                resultDivElement.innerHTML = "The sum is " + (firstNumber + secondNumber);
            }

            function shyam() {
                debugger;
                var firstNumber = parseInt(firstNumberInputTextElement.value);
                var secondNumber = parseInt(secondNumberInputTextElement.value);

                // DOM manipulation
                resultDivElement.innerHTML = "The sum is " + (firstNumber - secondNumber);
            }

        </script>
    </body>
</html>