prevent minus number in input

by magizter

HTML

<input class="styck" />

JavaScript

$('.styck').blur(
    function(){
        var v = $(this).val(),
            t = parseInt(v,10),
            b = isNaN(t);
        if (b){
            $(this).val('');
        }
        else {
            $(this).val(Math.abs(t));
        }
    });