Rails redirect with collection_select and javascript -

i have collection_select fires js set id in url when click occurs. here code.

application.js

$(document).ready(function(){     $("#org_id").on("change", function(){       val = $(this).val();       window.location = '/sessions?org_id='+ val;     }); }); 

view

<div id="org-select">   <%= collection_select :org, :id, org.all, :id, :name %> </div> 

rendered html

<div id="org-select">   <select id="org_id" name="org[id]"><option value="1">bustas</option> <option value="2">wintas</option></select> 

what of give me url /sessions?org_id=2.

the issue having select box in page defaults first org, , when user changes option in select, page fires/refreshes, page defaults first org, id in url not change.

well, collection_select have option set default value. can see on last example provided user here:

http://apidock.com/rails/actionview/helpers/formoptionshelper/collection_select

what can set selected value params getting url, this:

<%= collection_select :org, :id, org.all, :id, :name, {:selected => params[:org_id]} %> 

the ?org_id=2 part of url translated params[:org_id] internally, can use example above.
give try , see if works.