react-examples/professional_javascript_for_web/ch14/InputFieldEmailValidationExample01.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Input Field Email Example</title>
    <script type="text/javascript" src="EventUtil.js"></script>
</head>
<body>
    <p>Try submitting the following form without entering an email address. This only works in HTML5-compliant browsers.</p>
    <script>
        (function(){
            var message = "Your browser does not support the email input type.",
                input = document.createElement("input");

            input.type = "email";

            if (input.type=="email"){
                message = "Your browser supports the email input type";
            }
            document.write("<p>" + message + "</p>");

        })();
    </script>
    <form method="post" action="javascript:alert('Form submitted!')" id="myForm">
        <label for="email">Email:</label> <input type="email" name="email" id="email" required>
        <input type="submit" value="Submit Form"><br>
        <input type="button" value="Check Validity" id="btnCheck"><input type="button" value="Will Validate?" id="btnWill">
    </form>
    <script>
        EventUtil.addHandler(document.getElementById("btnCheck"), "click", function(event){
            alert(document.forms[0].elements[0].checkValidity());
        });
        EventUtil.addHandler(document.getElementById("btnWill"), "click", function(event){
            alert(document.forms[0].elements[0].willValidate);
        });
    </script>
</body>
</html>