react-examples/professional_javascript_for_web/ch14/TextboxClipboardExample01.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <title>Textbox Clipboard Example</title>
    <script type="text/javascript" src="EventUtil.js"></script>
</head>
<body>
    <p>You can only paste strings that are comprised only of numbers in the textbox below.</p>
    <form method="post" action="javascript:alert('Form submitted!')" id="myForm">
        <div>
            <label for="txtPhone">Type a phone number:</label><br>
            <input type="text" id="txtPhone" name="phone" value="">
        </div>
    </form>
    <script type="text/javascript">
        (function(){

            var textbox = document.getElementById("txtPhone");
            EventUtil.addHandler(textbox, "paste", function(event){
                event = EventUtil.getEvent(event);
                var text = EventUtil.getClipboardText(event);

                if (!/^\d*$/.test(text)){
                    EventUtil.preventDefault(event);
                }

            });

        })();

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