Using Cookies in Google Web App

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DreamDelerium

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Aug 17, 2020, 2:34:06 PM8/17/20
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Hello,
I wanted to ask if it is possible to use Cookies in a Google Web App?  I believe I had this working a few weeks back, but now when I try to read/write a Cookie, it is undefined.  I have tried using a jquery library, as well as doing this in javascript, but the console always returns a null or undefined response.  In my document load event, I run this code:

       $.cookie("test","some value");
       console.log($.cookie("test"))

and the response is "undefined".  If I try using vanilla javascript, like this:

      document.cookie = "test=some value";
      console.log(document.cookie)

then the output is a blank line. 

Are cookies blocked by Google Web Apps?  Or, am I doing something wrong?

Thanks

EDIT - I was asked to provide a minimal example. This is a basic example that still does not display cookies.


In a Google Sheet, I go to Tools-->Script Editor. Here, I have two files:


Code.js:


function doGet(e) { 
   output = HtmlService.createTemplateFromFile('index'); 
   return output.evaluate(); 
}

index.html:

<!DOCTYPE html>
<html>
  <head>
    <base target="_top">
    
    <script>
    document.cookie = "username=John Doe";
    var x = document.cookie;
     console.log( "Hello World" );
     console.log( x );
    </script>
  </head>
  <body>
    index
  </body>
</html>

When the site loads, only "Hello World" is printed to the console

DreamDelerium

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Aug 18, 2020, 3:02:09 PM8/18/20
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I am not sure if this a recent change (the way I used cookies two weeks ago worked fine) but I have found that if I better define my cookies as:

document.cookie = "user=John; SameSite=none; secure"; (ensuring the SameSite and Secure options are added)

the cookies work fine.

Martin Hawksey

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Aug 19, 2020, 6:40:28 AM8/19/20
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thanks for the update - appears to be a result of a change in the way Chrome handles cookies  https://duo.com/decipher/google-rolls-out-samesite-cookie-changes-to-chrome

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