How to limit the textarea to only hold numbers?

Question

I'm trying to make a date textbox on my blog, and the date is only numbers. I don't want anybody making a mistake typing a letter. Is there any way to limit the characters to only numerals? Thanks!

Answer 1

If you use jQuery, you can do it like in this jsfiddle

$('input').keypress(function(e) {
    var a = [];
    var k = e.which;

    for (i = 48; i < 58; i++)
        a.push(i);

    if (!(a.indexOf(k)>=0))
        e.preventDefault();
});