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<html> <head> <script type="text/javascript"> function validate() { x=document.myForm input=x.myInput.value if (input.length>5) { alert("The field cannot contain more than 5 characters!") return false } else { return true } } </script> </head> <body> <form name="myForm" action="http://www.w3schools.com/JS/tryjs_submitpage.htm" onsubmit="return validate()"> Enter some text (you will get a message if you add more than 5 characters): <input type="text" name="myInput" size="20"> <input type="submit" value="Submit"> </form> </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.