ruby on rails - Send_file does not down load the file -

i have application rails 3.2.22 , ruby 2.2. i'm trying implement send_file in application. download action triggered button click.

<input type='button' id='btn_save_log' value="save"/> 

corresponding ajax call implementation click event given below.

$("#btn_save_log").on('click', function () {     $.ajax({         url: "/a/b/save_trunk_logs?device_id="+deviceid+"&trunk_name="+trunkdevicename     }) }); 

controller action code given below

def save_trunk_logs    device_id = params['device_id']    trunk_name = params['trunk_name'] ||= "test"    data =""    file = "#{trunk_name}.txt"    trunk_logs = db taken(active record)     file.open(file, "w+") |afile|       afile.write("trunk name : #{trunk_name}\n")       afile.write("*"*100)       afile.write("\n")       afile.write("time stamp"+"\t"+"log message\n")       trunk_logs.each |msg|         data =format_log_messages msg         afile.write("#{data}\n")       end     end    send_file file, :type => 'application/text; charset=utf-8', :disposition => 'attachment' end 

every time hit action button click says file sent. not download in browser.

if manually hit route in browser, file getting downloaded.i want button click download file. i'm doing wrong.

any :)