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Convert PHP session cookie to JS

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Last Modified: 2020-02-14
Hey there,  I have a PHP session cookie on our site which sets when a visitor comes to our site from a paid ad, and follows them through the site, and passes the variable to our CRM when they fill out a form.

See the PHP code below. Works!

function set_ad_cookies() {
	
	$vars = array('wordpress_sourcetagji');
	foreach ($vars as $k) {
		if (isset($_GET[$k]) && !isset($_COOKIE[$k])) {
			setcookie($k, $_GET[$k], 0, '/', $domains['cookie_domain']);
		}
	}
	
	  if (!isset($_COOKIE['wordpress_sourcetagji'])) {
		setcookie('wordpress_sourcetagji', $_GET['wordpress_sourcetagji'], 0, '/', $domains['cookie_domain']);
	  }
  }
  add_action('init', 'set_ad_cookies');

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We are now finding that caching is stripping the cookie value when they navigate to a different page. Flywheel have said that this will happen as it's php and need to keep the caching on, and the only solution is to create the cookie in JS.

I've got very basic js skills, so how could i convert the above PHP code into JS so that   Scenario :
User1 comes into the site from an ad  https://mysite.com/?wordpress_sourcetagji=this-monster-cookie
User 1 visits varous pages on our site, and then fills out a form.
Cookie is still active and keeps it's value until the session ends.
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Systems architect
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