updaing a page continuously using ajax

I had written a small web app that gets the date(or any data) from a
external device and print it on screen(browser screen) continously
without refreshing the page.

I am using below form_tag inside view file
(myapp/app/views/index.html.erb):

<%= form_tag(channel_get_dates_path(@channel, :write => 1), :remote =>
true) do %>
     <input type="submit" value="Get Today's Date">
     <input id="get_date" type="text" value="<%=@write_date%>">
<% end %>

and javascript method in view file (myapp/app/views/create.js.erb):
  $("#get_date").val("<%= @get_date %>")

Here, when i press the button it will call the method in controller and
display the date in text field without any page refresh.

My question, Is it possible to make the date to display in text field
continuously by pressing the button only once? I tried calling the
Controller method inside a loop and ended with Double render error. is
it correct way or to make changes in view file?

my controller file(maapp/app/controller/get_dates_controller.rb):

class GetDatesController < ApplicationController
include DateUtilities

  before_filter :require_user, :set_channels_menu

  def index
    @channel = current_user.channels.find(params[:channel_id])
          @write_date = @channel.get_dates.write_dates.first
  end

        def destroy
    current_user.get_dates.find_by_get_date(params[:id]).try(:destroy)
    redirect_to :back
  end

  def create

                @channel =
current_user.channels.find(params[:channel_id])
    @get_date = @channel.get_dates.write_dates.first

    if (@get_date.nil?)
      @get_date = GetDate.new
      @get_date.channel_id = @channel.id
      @get_date.user_id = current_user.id
      @get_date.write_flag = params[:write]
    end

    @get_date.get_date = generate_get_date

                respond_to do |format|
                   @get_date.save
                   format.html { redirect_to
channel_get_dates_path(@channel) }
                   format.js
                end
  end
end

and i have date generation file(myapp/app/lib/date_utilities) as:

module DateUtilities

  def generate_get_date
    require 'rubygems'
    require 'socket'

    hostname = '127.0.0.1'
    port = 2000
    streamSock = TCPSocket.new( hostname, port )
    streamSock.write "ON"
    while line = streamSock.gets
        k = line
    end
    k
  end
end

Deepak A. wrote in post #1105859:

My question, Is it possible to make the date to display in text field
continuously by pressing the button only once? I tried calling the
Controller method inside a loop and ended with Double render error. is
it correct way or to make changes in view file?

You need a bit of JavaScript to accomplish what you want. Read up on
setInterval() function:

http://www.w3schools.com/jsref/met_win_setinterval.asp

Then use JQuery to update your input field in the function called each
time the setInterval() fires:

$('#get_date').val(current_date);

How you get "current_date" is up to you. You can get the current date
directly in JavaScript or get it from the server using AJAX (Jquery).

http://api.jquery.com/jQuery.get/

Robert Walker wrote in post #1105861:

Deepak A. wrote in post #1105859:

My question, Is it possible to make the date to display in text field
continuously by pressing the button only once? I tried calling the
Controller method inside a loop and ended with Double render error. is
it correct way or to make changes in view file?

You need a bit of JavaScript to accomplish what you want. Read up on
setInterval() function:

http://www.w3schools.com/jsref/met_win_setinterval.asp

Then use JQuery to update your input field in the function called each
time the setInterval() fires:

$('#get_date').val(current_date);

How you get "current_date" is up to you. You can get the current date
directly in JavaScript or get it from the server using AJAX (Jquery).

http://api.jquery.com/jQuery.get/

thanks for your precious suggestions, i have used setinterval function
in view file. And now i able to get date from the device continuously
without page refresh.