how to change view's vairable in js of rails

how to change view's variable value in javascript. I mean when i select April from dropdown table will show only April's data and current table data will disappear and refreshed. How can i do it? Help me
My JS

:javascript
    var updateMonth = function(){
        var month_id = $("#select_other_month").val();
        console.log(month_id)
    }

here is my select tag (dropdown)

%select{:name => "options", :id=>"select_other_month",:onchange=>"updateMonth()"}
            %option.placeholder{:disabled => "", :selected => "", :value => ""} see other months
            %option{:value => "0"} this month
            -a=@this_month - 1.month
            %option{:value => "5"}=a.strftime('%Y-%m')
            -b=@this_month - 2.month
            %option{:value => "4"}=b.strftime('%Y-%m')
            -c=@this_month - 3.month
            %option{:value => "3"}=c.strftime('%Y-%m')
            -d=@this_month - 4.month
            %option{:value => "2"}=d.strftime('%Y-%m')
            -e=@this_month - 5.month
            %option{:value => "1"}=e.strftime('%Y-%m')

and my table looks like this

.table{:id=>"time_table"}
        %table{:border=>"1"}
            %thead
                %tr
                    %th No
                    %th Name
                    -(@xmonth.at_beginning_of_month..@xmonth.at_end_of_month).each do |day|
                        -if (day.saturday? || day.sunday?)==false
                            %th=day.strftime("%d")
                    %th Total days
                    %th Total time

I want change my @xmonth vairable from JS
Note: @this_month = Date.today