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Editorial Team
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Asked: 2026-05-23T08:59:17+00:00

<html> <form action=update.php method=POST name=ID> <input type=text name=ID > <input type=Submit value=Submit> </form> </html>

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<html>
<form action="update.php" method="POST" name="ID">
<input type="text" name="ID" ">
<input type="Submit" value="Submit">
</form>
</html>

How can this form accept only numbers and not “a-z” or “,./’;[])(-=” ?

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1 Answer

  1. Editorial Team

    You can use the javascript function isNAN to check if the value of the field “is not a number”. So, I added a onclick event to the submit button to call a function that checks it:

    <html>
<head>
<script type="text/javascript">

    function validate() {

        if (isNaN(document.forms[0].ID.value)) { 
            alert("Please enter only numbers.")
            return false;
        }
        return true;
    }


</script>
</head>
<form action="update.php" method="POST" name="ID">
<input type="text" name="ID">
<input type="Submit" value="Submit" onclick="return validate();">
</form>
</html>

    Hope it helps!

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