passing value of checkbox to jquery function

I have a simple form with several bootstrap toggle checkboxes like so:

<input type="checkbox" value="8" name="fee_hidden8" id="fee_hidden8" class="btoggle" data-toggle="toggle" data-on="<i class='glyphicons glyphicons-eye-close'></i> Hidden" data-off="<i class='glyphicons glyphicons-eye-open'></i> Visible" data-onstyle="danger" data-offstyle="success">
<input type="checkbox" value="9" name="fee_hidden9" id="fee_hidden9" class="btoggle" data-toggle="toggle" data-on="<i class='glyphicons glyphicons-eye-close'></i> Hidden" data-off="<i class='glyphicons glyphicons-eye-open'></i> Visible" data-onstyle="danger" data-offstyle="success">

Where the 'id' of the record to be updated is the 'value' of the checkbox.

I want to pass the "value" of the checkbox to my jquery function -- or -- grab the assigned value that contains the id of the record to update:

  $(function() {

    $('.btoggle').change(function() {
        if($(this).prop('checked'))
        {var st = 'Yes'}
        else
        {var st = 'No'};

        // not sure what to do here
        //var fx = $(this).val();
        var fx = $(this).attr('value');
        alert(fx);

        $.post("tsafunctions.cfc", {
            method: 'visiblehidden',
            fc: fx,
            status: st
            });

    })
  });