react-examples/professional_javascript_for_web/ch14/FormFieldsExample01.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Form Fields Example</title>
    <script type="text/javascript" src="EventUtil.js"></script>
</head>
<body>
    <form method="post" action="javascript:alert('Form submitted!')" id="myForm">
        <ul>
            <li><input type="radio" name="color" value="red">Red</li>
            <li><input type="radio" name="color" value="green">Green</li>
            <li><input type="radio" name="color" value="blue">Blue</li>
        </ul>
    </form>
    <script type="text/javascript">
        (function(){
            var form = document.getElementById("myForm");

            var colorFields = form.elements["color"];
            alert(colorFields.length);  //3

            var firstColorField = colorFields[0];
            var firstFormField = form.elements[0];
            alert(firstColorField === firstFormField);   //true

        })();

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