How I can access POST and GET values with javascript in PHP is $_GET and $_POST but in Javascript Searched everywhere. I could not find
Unless I'm wrong (which is definitely possible) javascript cannot access that data. The data is sent to the server, so PHP can get to it. But as a client-side language javascript is out of luck.
hmm, if you're using PHP in conjunction with JS you can probably asign it to vars Ex: var jsVar = '<?php echo $phpVar; ?>';
For variables contained in a <form> you have to access them through the DOM or the form collection whether the form is a GET or POST form. There's a slight exception to this with GET forms. Note that there's no way to access POST variables once the form has passed the "onSubmit" event unless the server re-inserts them into the form. For GET variables on the querystring, which is where they'll be after a GET <form> has been submitted, you have to parse window.location.href yourself. It will be whatever you see in the address bar of your browser. Firefox gives you direct access to window.location.search which is only the querystring, but Firefox is the only one I know of that does that.
Also, if your data is in the least bit sensitive, don't use GET. All the login security and enforced strong passwords in the world won't matter if they're up in the address bar.