How do I force certain input fields in my form to accept only positive values with up to two decimal points?

I am using jquery calx to create a form that works out several company expenses for an ecommerce site.
In some of the fields - all those with class checkNegative (or marked with #A2#, #A18#, #A19#, #A20#, #A28# - I would like to force users to insert only positive values with up to two decimal places.

How do I do it?

I have tried using this function but it sort of does not work.
$(".checkNegative").bind("change paste input", function(){
	$(this).val( Math.abs($(this).val()) );
});				

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With this code I cannot enter any negative values because as soon as I try it gives me NaN error (whereas I would like like to remove the "-" sign when typed). However I am unable to add any numbers that are not whole (like with decimal places)

Please help

thanks in advance

I am attaching the code for testing.
calx-formulae.zip
badwolfffAsked:
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RobOwner (Aidellio)Commented:
Here you go: http://jsbin.com/qapequ/1/edit?js,output

$(".checkNegative").on("input", function(e){
	var t = isNaN(Number(e.target.value)) ? 0 : e.target.value;
    $(e.target).val(Math.abs(Number(t)));
});

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badwolfffAuthor Commented:
Hi,

it doesn't work right. When I try to add a normal positive number like 11.55 it forces me to take it as 1155.
I need to be able to put in

11
11.55
11.5 (this already becomes 11.50)

if instead I were to put in

-11 > becomes > 11
-11.55 > becomes > 11.55
-11.5 > becomes > 11.50

there is another problem with your function. If you try to add any values to A18 - A20, I get strange numbers automatically in A28 (while it should not change at all)

I think we need a Regex here but I don't know how to write it.

thanks
badwolfffAuthor Commented:
I managed it myself

thanks anyways

$("#valoredonazione").bind("change paste input", function () {
    if ($(this).val() < 0) {
        window.console && console.log('condition met');
        $(this).val(function (index, value) {
            return value.replace('-', '');
        });
    }
});

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RobOwner (Aidellio)Commented:
Cool. Glad you got your answer :)
Michel PlungjanIT ExpertCommented:
Or just

$("#valoredonazione").on("change paste input", function () {
   var val = $(this).val();
    if (parseFloat(val) < 0) {
        window.console && console.log('condition met');
        $(this).val(val.replace('-', ''));
    }
});

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badwolfffAuthor Commented:
I solved it myself
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