CODEWITHSUNDEEP
rubyruby-on-rails-4cookiescontroller
user7383466
user7383466

Reputation:

Ruby on Rails - Read Cookie value after page load

In my application in one of my views, I add a Cookie from my Controller and based on this Cookie, I set a value to my variable (which will be used in my view).

class SomeController < ApplicationController

  def a_action
    if params[:utm] == 'a'
       cookies[:user_cookie] = {value: 'a', expires: 1.day.from_now}
    else
       cookies[:user_cookie] = {value: 'b', expires: 1.day.from_now}
    end

    if cookies[:user_cookie] == 'a'
       @variable = 'a'
    else
       @variable = 'b'
    end
  end

In my view a_action#some, I'm doing:

%h1= @variable

When user is coming to a_action#some view, cookies[:user_cookie] is set to user's browser cookie, but my view or controller doesn't read Cookie value until next refresh. So @variable in my view becomes wrong value/no value at all.

Is it possible to read Cookie after page is loaded so my @variable always has a value and don't need to wait for next refresh?

Upvotes: 0

Views: 1989

Answers (1)

DiegoSalazar
DiegoSalazar

Reputation: 13521

Cookies are a client side feature. You server can only read cookies when there is a request, i.e in your controller action.

The only way to read a cookie after the page has loaded is with Javascript: document.cookie

https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie

http://clubmate.fi/setting-and-reading-cookies-with-javascript/

Upvotes: 1

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