javascript - multiple dynamic drop down lists in form -


i have form drop down lists in each row. change in dropdown list on column must result in hiding field in column b in same row. here trimmed-down version of 1 row in table.

<form class="form-horizontal">   <div class="form-group">     <div class="duration">       <select id="session_attributes_0_duration">         <option value="0">15 minute block</option>         <option value="1">30 minute block</option>         <option value="2">1 hour block</option>       </select>     </div>     <div class="cost>       <input id="session_attributes_0_cost">     </div>   </div>

and here coffeescript try hide cost in case of '15 minute block'

set_duration_changes = () ->   durations = find_all_duration_drop_downs()   duration in durations     if duration.firstchild.tagname == "select"       $(duration).on 'change', duration, (evt) ->         hide_cost(duration)  hide_cost = (duration) ->   duration_in_words = find_choice(duration.firstchild)     if duration_in_words == '15 minute block'       cost = duration.nextsibling       cost.style.display = "none"

unfortunate event affects last row in table. need strategy explains steps should follow. can share me example of how define event occur on select element of correct table row?

i have solved problem defining jquery change event. have still plenty learn not surprised if following code can refactored:

set_session_duration_change_event = () ->   $('.session-duration').on 'change', (e) ->     durationlist = $(this)     durlistid = durationlist.attr('id')     if !durlistid        return     duration_value = durationlist.val();     rowid = durlistid.charat(46)     customdurid = 'care_service_care_service_sessions_attributes_' + rowid + '_custom_duration_4i'     if (duration_value == "0") || (duration_value == "1") || (duration_value == "2")       customdur = document.getelementbyid(customdurid)       customdur.parentelement.classname += " hidden"     else       customdur = document.getelementbyid(customdurid)       customdur.parentelement.classname = "custom-duration"     return

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