parseFloat, double, toFixed(2), jquery keypress format number double

parseFloat, double, toFixed(2), jquery keypress format number double

HTML

<input type="input" id="preco-1" maxlength="10" />

CSS

[id^=preco]{border:1px solid #000; text-align:right;}
[id^=preco]:hover{background:cyan;}
body{background:#272822;}

JavaScript

$(document).on('keypress', '[id^=preco]', function(e) {
    if (validateNumberDouble(e) == false) {
        return false;
    }
});

function validateNumberDouble(event) {
    var n = event.key;
    k = event.keyCode;
    v = event.target.value;

    if (k === 8 || k === 37 || k === 39 || k === 9 || k === 13) {
        return true;
    } else {
        var dot = v.split('.').length;

        if ((dot > 1 && n == '.') || (v.length == 0 && dot >= 1 && n == '.')) {
            return false;
        } else {
            if (n.match(/[^0-9.]/)) {
                return false;
            }else{
            	if(v.indexOf('.')>0 && v.length - v.indexOf('.')>=3){
                	return false;
                }
            }
        }
    }
}