Numerals Only : TextField « Form Control « JavaScript DHTML

Numerals Only

<TITLE>Numerals Only</TITLE>
function numeralsOnly(evt) {
    evt = (evt) ? evt : event;
    var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode : 
        ((evt.which) ? evt.which : 0));
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        alert("Enter numerals only in this field.");
        return false;
    return true;
<input type="text" ... onkeypress="return numeralsOnly(event)">

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