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Enter Numeric Values In Textbox

This code restricts the user from accidentally typing characters into a, say, phone number field...

The javascript goes like:

function isNumber(e)
    var code, num, regex;
    code = e.keyCode;
    num = String.fromCharCode(code);
    regex = /\d/;
    return regex.test(num);

The html code goes like:

For firefox/netscape/opera instead of window.event.keyCode use window.event.which

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}