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Examples
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Example.2 using onkeypress HTML Element Attribute
<html>
    <head>
        <script type="text/javascript">
            function doit_onkeypress(event){
                if (event.keyCode == 13 || event.which == 13){
                    alert("You are clicked");
                }
            }
        </script>
    </head>
    <body>
         Username: <input type="text" id="txt_username" onkeypress="javascript:doit_onkeypress(event);" />
    </body>
</html>
Example
<html>
    <head>
        <script type="text/javascript">
            document.getElementById("txt_username").onkeypress = function(event){
                if (event.keyCode == 13 || event.which == 13){
                    alert("You are clicked");
                }
            };
        </script>
    </head>
    <body>
         Username: <input type="text" id="txt_username" />
    </body>
</html>
Demo & Output 
[Click here to see Demo]
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