change confirm alert

gistfile1.txt

  $(".buhs").on "change paste keyup", (e) ->
    thistable = this.parentElement.parentElement.parentElement.parentElement.parentElement.parentElement
    caseid = $(thistable).find('#case_id')[0].value
    buysell =  $(thistable).find('#buysell')[0].value
    varcursum = $(this)[0].value
    $.ajax '/render_alert_text',
        type: 'GET'
        data: {case_id: caseid, buysell: buysell, varcursum: varcursum }
        dataType: 'text'
        success: (data, textStatus, jqXHR) ->
            outer = $(thistable).find('#btn-buh')[0].outerHTML
            pos_beg = outer.indexOf('onfirm="') + 8
            pos_end = outer.indexOf('пись?"') + 5

            current_message = outer.substring(pos_beg, pos_end)
            outer2 = outer.replace(current_message, data)

            $(thistable).find('#btn-buh')[0].outerHTML = outer2