Passing JavaScript Variables to PHP Session

Question

Why I do not get any printing on the screen (m1, m2 or m3)?

i.e. how can I pass JavaScript var to PHP Session.

<?php session_start(); ?>

<html>
<head>

<script type="text/javascript">
function disp_text()
   {
      var p = document.myform.mylist.value;
      <?php $_SESSION['color'] ?> = p;
      <?php echo $_SESSION['color'] ?>;
   }
</script>

</head>
<body>

<FORM NAME="myform">
<SELECT NAME="mylist" onChange="disp_text()">
<OPTION VALUE="m1">Red
<OPTION VALUE="m2">Blue
<OPTION VALUE="m3">Green
</SELECT>
</FORM>

Thanks for any help.

This has been answered here: stackoverflow.com/questions/15067335/… — Luqman Adris
– Luqman Adris, Commented Nov 4, 2013 at 6:10

Niet the Dark Absol · Accepted Answer · 2012-06-30 14:40:29Z

5

And another one for the count... JavaScript runs on the user's computer, PHP runs on the server. View the page source (right-click, View Source) and you will see exactly why it doesn't work:

<script type="text/javascript">
function disp_text()
   {
      var p = document.myform.mylist.value;
      = p;
      ;
   }
</script>

The only way to get JS variables into PHP is via a form (which I am using loosely to include AJAX).

answered Jun 30, 2012 at 14:40

Niet the Dark Absol

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4 Comments

blsn Over a year ago

I’m not familiar with Ajax. Could you please give a small tip of how do I get this done (via a form). Thanks again.

Niet the Dark Absol Over a year ago

Google has about 12,900,000 results for "ajax tutorials". Pick one.

blsn Over a year ago

Thank you all for your support, but I thought to get here a simple answer to a simple question which is related to PHP and Javascript. I didn’t except an answer of go study Ajax. I would appreciate it, if anybody has a solution for me with PHP and Javascript,

Niet the Dark Absol Over a year ago

PHP can pass whatever it wants to JavaScript, because it runs before the JS does. However, to get JS stuff back into PHP you have to use AJAX.

User · Accepted Answer · 2014-04-26 15:57:11Z

0

Try this

<html>
<head>
<script type="text/javascript">
function disp_text()
   {
      var e = document.getElementsByName("mylist")[0];
      var p = e.options[e.selectedIndex].value;
      sessionStorage.color = p;
      document.write(p);
   }
</script>
</head>
<body>
<FORM NAME="myform">
<SELECT NAME="mylist" onChange="disp_text()">
<OPTION VALUE="m1">Red</OPTION>
<OPTION VALUE="m2">Blue</OPTION>
<OPTION VALUE="m3">Green</OPTION>
</SELECT>
</FORM>
</body>
</html>

edited Apr 26, 2014 at 15:57

answered Apr 3, 2014 at 15:36

User

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Comments

Marvin Fischer · Accepted Answer · 2021-09-29 22:35:29Z

0

index.php:

<script type="text/javascript">
    var time = "OK then, let's do this!";
    sessionStorage.setItem("time", time);
    window.location.href = "test.php";
</script>

test.php

<script type="text/javascript">
    var time = sessionStorage.getItem("time");
    console.log(time);
    <?php $abc = "<script>document.write(time)</script>"?> 
</script>

<?php
    echo $abc;
?>

edited Sep 29, 2021 at 22:35

Marvin Fischer

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answered Sep 29, 2021 at 21:58

Kenneth Jimmerson

1

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