jquery - on change of textbox value, check condition on the basis of rails instance variable -

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in rails application, have text-area value changes on basis of checkbox. text-area

<%= f.text_area :sent_to, :class => 'form-control'%>

on change of content of text-area, want count number of comma separated values in text-area , check if exceeds number stored in instance variable @org_msg_limit. instance variable have field promo_limit on basis of want check number of comma separated values in text-area. if value in text-area exceeds number in promo_limit display alert/message. how this?

i tried make hidden field set value of variable instance vairable

<%= hidden_field "trans_limit", :value => limit.trans_limit.to_i %>

than made .change function follows not working.

<script type="text/javascript">     $(document).ready(function(){         $('#sent_to').val().change(function() {             alert("hello");         var limit = $('#trans_limit').val();         alert(limit);     });     }); </script>


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