javascript to php in the same page

From	alex <alex@nomailno.it>
Newsgroups	comp.lang.php
Subject	javascript to php in the same page
Date	2016-02-14 12:48 +0100
Organization	Aioe.org NNTP Server
Message-ID	<n9pph5$1qss$1@gioia.aioe.org> (permalink)

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<html>
<body>
Select a file to upload:
<input type="file" id="myFile" onchange="myFunction()" size="50" >
<p id="demo"></p>
<script>
function myFunction() {
var vx = document.getElementById("myFile").value;
document.getElementById("demo").innerHTML = vx;
}
</script>
</body>
</html>

<?php
if (isset($value)){echo $value;}

?>


the variable vx I ned to use in the php $value

when I have this value the all page is loaded so is need to recall the 
page php, but so I lose the value already selected;
I find some solutions: akax, filed hidden, cookie; but not know how use 
in my code

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javascript to php in the same page alex <alex@nomailno.it> - 2016-02-14 12:48 +0100
  Re: javascript to php in the same page Tim Streater <timstreater@greenbee.net> - 2016-02-14 12:12 +0000
  Re: javascript to php in the same page Luuk <luuk@invalid.lan> - 2016-02-14 15:00 +0100
  Re: javascript to php in the same page Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-02-14 15:31 +0000
    Re: javascript to php in the same page alex <alex@nomailno.it> - 2016-02-14 16:45 +0100
      Re: javascript to php in the same page Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2016-02-14 11:08 -0500
      Re: javascript to php in the same page Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-02-14 16:43 +0000
        Re: javascript to php in the same page Luuk <luuk@invalid.lan> - 2016-02-14 17:50 +0100
          Re: javascript to php in the same page "Christoph M. Becker" <cmbecker69@arcor.de> - 2016-02-14 18:17 +0100
            Re: javascript to php in the same page Luuk <luuk@invalid.lan> - 2016-02-14 19:42 +0100
        Re: javascript to php in the same page Tim Streater <timstreater@greenbee.net> - 2016-02-14 19:21 +0000
          Re: javascript to php in the same page Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-02-14 21:40 +0000
            Re: javascript to php in the same page Erwin Moller <erwinmollerusenet@xs4all.nl> - 2016-02-15 14:49 +0100
              Re: javascript to php in the same page Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-02-15 19:20 +0000
      Re: javascript to php in the same page Arno Welzel <usenet@arnowelzel.de> - 2016-02-15 13:51 +0100
        Re: javascript to php in the same page praider650@gmail.com - 2016-08-17 03:23 -0700

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