Check if third-party cookies are enabled

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既然无缘 2020-11-27 10:58

I have an application that needs to check whether the client browser has third-party-cookies enabled. Does anyone know how to do this in JavaScript?

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星月不相逢 (楼主)

2020-11-27 11:31

⚠️ Update: Multiple browsers are now implementing stricter privacy controls that may cause this test to give a "false negative" result, meaning that it will conclude that third-party cookies are disabled when they may in fact be enabled but blocked in use-cases similar to that of the test.

Here's a pure JS solution not requiring any server-side code, so it can work from a static CDN: https://github.com/mindmup/3rdpartycookiecheck - the first script sets the cookie in the code, then redirects to a second script that will post a message to the parent window.

You can try out a live version using https://jsfiddle.net/tugawg8y/

client-side HTML:

third party cookies are 

</code></pre>
<p>client-side JS:</p>
<pre><code> var receiveMessage = function (evt) {
   if (evt.data === 'MM:3PCunsupported') {
     document.getElementById('result').innerHTML = 'not supported';
   } else if (evt.data === 'MM:3PCsupported') {
     document.getElementById('result').innerHTML = 'supported';
   }
 };
 window.addEventListener("message", receiveMessage, false);
</code></pre>
<p>Of course, this requires that the client runs JavaScript which is a downside compared to the server-based solutions; on the other hand, it's simpler, and you were asking about a JS solution.</p>
    </p>
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