Check If Cookies Are Enabled

Check if cookies are enabled

JavaScript

In JavaScript you simple test for the cookieEnabled property, which is supported in all major browsers. If you deal with an older browser, you can set a cookie and check if it exists. (borrowed from Modernizer):

if (navigator.cookieEnabled) return true;

// set and read cookie
document.cookie = "cookietest=1";
var ret = document.cookie.indexOf("cookietest=") != -1;

// delete cookie
document.cookie = "cookietest=1; expires=Thu, 01-Jan-1970 00:00:01 GMT";

return ret;

• Modernizer cookie check commit
• Checking if Cookies are Enabled

PHP

In PHP it is rather "complicated" since you have to refresh the page or redirect to another script. Here I will use two scripts:

somescript.php

<?php
session_start();
setcookie('foo', 'bar', time()+3600);
header("location: check.php");

check.php

<?php echo (isset($_COOKIE['foo']) && $_COOKIE['foo']=='bar') ? 'enabled' : 'disabled';

• Detecting if the cookies are enabled with PHP
• PHP and Cookies, A Good Mix!

How to detect that JavaScript and/or Cookies are disabled?

For checking cookies you can use:

function checkCookie(){
    var cookieEnabled = navigator.cookieEnabled;
    if (!cookieEnabled){ 
        document.cookie = "testcookie";
        cookieEnabled = document.cookie.indexOf("testcookie")!=-1;
    }
    return cookieEnabled || showCookieFail();
}

function showCookieFail(){
  // do something here
}


// within a window load,dom ready or something like that place your:
checkCookie();

And for checking JavaScript use a <noscript> tag with some kind of message inside

How to detect server-side whether cookies are disabled

Send a redirect response with the cookie set; when processing the (special) redirected URL test for the cookie - if it's there redirect to normal processing, otherwise redirect to an error state.

Note that this can only tell you the browser permitted the cookie to be set, but not for how long. My FF allows me to force all cookies to "session" mode, unless the site is specifically added to an exception list - such cookies will be discarded when FF shuts down regardless of the server specified expiry. And this is the mode I run FF in always.

How to check if cookies are enabled or disabled in asp.net?

See the following link.

http://forums.asp.net/t/1044823.aspx?How+to+check+cookies+enabled+in+a+web+browser+

The only way to check is set a cookie then redirect it and again check if you are able to access it or not. So try below method mentioned in above link.

protected void Page_Load(object sender, EventArgs e)
{
    if (this.IsCookieDisabled())
      errorMsgLabel.Text = Resources.Resource.BrowserDontSupportCookies;

}


private bool IsCookieDisabled()
{
 string currentUrl = Request.RawUrl;

 if (Request.QueryString["cookieCheck"] == null)
 {
     try
     {
            HttpCookie c = new HttpCookie("SupportCookies", "true");
            Response.Cookies.Add(c);

            if (currentUrl.IndexOf("?") > 0)
                currentUrl = currentUrl + "&cookieCheck=true";
            else
                currentUrl = currentUrl + "?cookieCheck=true";

            Response.Redirect(currentUrl);
       }
       catch(Exception ex)
       {
          return false;
       }
 }

 if (!Request.Browser.Cookies || Request.Cookies["SupportCookies"] == null)
      return true;

return false;
}

Detect if cookies are enabled in PHP

I think its better to make one file set cookie and redirect to another file. Then the next file can check the value and determine if cookie is enabled. See the example.

Create two files, cookiechecker.php and stat.php

// cookiechecker.php
// save the referrer in session. if cookie works we can get back to it later.
session_start();
$_SESSION['page'] = $_SERVER['HTTP_REFERER'];
// setting cookie to test
setcookie('foo', 'bar', time()+3600);
header("location: stat.php");

and

stat.php

<?php if(isset($_COOKIE['foo']) && $_COOKIE['foo']=='bar'): 
// cookie is working
session_start();
// get back to our old page
header("location: {$_SESSION['page']}");
else:            // show the message ?>
cookie is not working
<? endif; ?>

Load cookiechecker.php in browser it'll tell cookie is working. Call it with command line like curl. It'll say, cookie is not working

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Update

Here is a single file solution.

session_start();

if (isset($_GET['check']) && $_GET['check'] == true) {
    if (isset($_COOKIE['foo']) && $_COOKIE['foo'] == 'bar') {
        // cookie is working
        // get back to our old page
        header("location: {$_SESSION['page']}");
    } else {
        // show the message "cookie is not working"
    }
} else {
    // save the referrer in session. if cookie works we can get back to it later.
    $_SESSION['page'] = $_SERVER['HTTP_REFERER'];
   // set a cookie to test
    setcookie('foo', 'bar', time() + 3600);
    // redirecting to the same page to check 
    header("location: {$_SERVER['PHP_SELF']}?check=true");
}

Check if cookies are enabled without redirect

It's not possible because Cookies are in the browser, and PHP send them when the page has render, so will be available just in the second page.
A possible way to fix this is using javascript.
If you really should do it in PHP, for some crazy reason, send all your request to a main controller and save the state using other method, for example, write a var into a file, then redirect and in the next redirections you'll know if the cookies are enabled without needed any other redirection. Example:

$file = 'cookie_fake_'.$userIP;
if( !isset($_COOKIE['COOK_CHK']) && !file_exists($file) ){
    file_put_contents($file, 'dummy');
    setcookie('COOK_CHK',uniqid(),time()+60*60*24);
    header('Location:/');
    exit;
}
if(!isset($_COOKIE['COOK_CHK'])){
    setcookie('COOK_CHK',uniqid(),time()+60*60*24);
    echo"Cookies are disabled!";
    exit;
}

Then you should write something to clean old files every hour or so, of course you can use a cache layer or a database or anything like that instead of writing a file.

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Edit: The previous code will be really f** up if the user enables cookies and refresh the page, now I've fixed so it works at the second time it refresh. Not perfect but... You really should do this using javascript.

Cheers.

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