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<html> <head> <script type="text/javascript"> function validate() { x=document.myForm at=x.email.value.indexOf("@") if (at == -1) { alert("Not a valid e-mail") return false } } </script> </head> <body> <form name="myForm" action="http://www.w3schools.com/JS/tryjs_submitpage.htm" onsubmit="return validate()"> Enter your E-mail: <input type="text" name="email" size="20"> <input type="submit" value="Submit"> </form> <p><b>Note:</b> This example ONLY tests if the e-mail address contains an "@" character. A "real-life" code would have to test for punctuations, spaces and other things as well.</p> </body> </html>
Edit the text above, and click on the button to see the result.

Edit the text above, and click on the button to see the result.