Allowing Only Numbers into a Text Box : Formatted TextField « Form Control « JavaScript DHTML

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JavaScript DHTML » Form Control » Formatted TextField 




Allowing Only Numbers into a Text Box

/*
JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001
*/

<HTML>
<HEAD>
<TITLE>Letting Only Numbers Pass to a Form Field</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function checkIt(evt) {
    evt = (evt? evt : window.event
    var charCode = (evt.which? evt.which : evt.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        status = "This field accepts numbers only."
        return false
    }
    status = ""
    return true
}
</SCRIPT>
</HEAD>

<BODY>
<H1>Letting Only Numbers Pass to a Form Field</H1>
<HR>
<FORM onSubmit="return false">
Enter any positive integer: <INPUT TYPE="text" NAME="numeric" 
    onKeyPress="return checkIt(event)">
</FORM>
</BODY>
</HTML>


           
       














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