Add/remove textbox value when checkbox change

I have the following jquery code where i want to remove the value from the textfield if the checkbox is unchecked and add if it is checked.

initially all the values comes in the textbox as the ^ seperator. and all checkboxes checked

here is y piece of code:

$(document).on('change','._invoice',function() { 
    var mystr = $(this).attr('data-id').is(":checked");
    if(mystr) {
        var returnVal = confirm("Are you sure?");
        $(this).attr("checked", returnVal);
    }    
    });
});

Text field values and i also want to remove the separator and add the name at the last with ^ as separator.

Robert Berenson^Nancy Foster^Richard Gourhan^LORI HEDMAN^Pui Hoang^Linda Lee^Kristen McDonald^Matthew Miller^Tricia Roland^Terry West