Need to fire JS Link back with captured variable

[n1concepts]

Requirements & Objectives:

 

Ensure $x is populated (not empty) and fires $x variable if TRUE back to http://domain2.com/log.php?x=$_REQUEST['a'] on page (success.php) load.

 

http://domain2.com/log.php        // This is the page that needs to receive appended variable from http://domain1.com/success.php via JS

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START OF PROCESS:
http://domain1.com/index.php?id=test123    

// this is the receiving domain with appended variable 'id' sent to www.domain1.com/index.php


http://domain1.com/success.php?a=$_REQUEST['id']            
// variable 'id' is then captured & passed, from inbound.php to success.php to which I, then, need that page (success.php) to fire the captured var $a back to domain2.com/log.php as var 'x' via JS.

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Again, the objective is to get 'success.php' to assign $x to link and fire as: http://domain2.com/log.php?x=$_REQUEST['a'] on page (success.php) load via JS. I have the variable capture process, via PHP worked out - just need help with the JS part on success.php to fire the url back to www.domain2.com with captured var $x if populated.

 

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Any help appreciated - thx!

[dalecosp]

Sounds like AJAX, not rocket science.  What do you have so far?  Javascript works in the DOM, and you're showing no code.

[n1concepts]

Yeah, that's for responding - I was just thinking AJAX earlier.

I have the logic in my head and will throw - what I think required - together in just a bit for you to review and advise.

 

Appreciate the response and will provide the code for review shortly - thx!