jquery - count values of checked checkbox

Question

I want to get the total value of all checked checkboxes. What i've tried is this:

$("input[type=checkbox]:checked").each(function() {
            total_modules += parseFloat($(this).val());
        });
        $("#total_modules").text(total_modules.toFixed(2));

This didn't work.

I hope someone can help me.

Thanks in advance!

PS: I fixed it, this is my new code:

function calculation()
    {
    $("input[type=checkbox]:checked").each(function() {
            total_modules += parseFloat($(this).val());
        });
        $("#total_modules").text(total_modules.toFixed(2)); 
    }
    calculation();

    $("input[type=checkbox]").click(function()
    {
        calculation();
    });

Thank you all

Answer 1

You can do $("input[type=checkbox]:checked").length to get the number of checked checkboxes.

Check out this jsFiddle