如何在javascript文件中访问php会​​话？

Question

Below is my code:

index.php file

javascript of index.php file

function Result()
{
  var marks = 55;
  document.getElementById("hdnmarks").innerHTML= marks; 
  window.location = "results.php";
}

HTML of index.php

<input type="hidden" name="hdnmarks" id="hdnmarks">

Description: I have a web page with url localhost/index.php . In index.php, I have a submit button on the click of which I call Result javascript method which sets the marks = 55 and put it into the hidden field and takes me to the results.php page.

In results.php , I have to insert value of marks in the database. But how should I access the marks as those were stored in the hidden field of index.php file?

I want to put marks in the session, but how should I maintain the PHP session in javascript function? I mean where and when should I put marks in the session before moving to results.php ?

Answer 1

you can start session on your page like <?php session_start();?> and create hidden field for session like this

<input type="hidden" name="mysession" id="mysession">

and modify javascript function some thing like this

function Result(){
  var marks = 55;
  document.getElementById("mysession").innerHTML= <?php echo session_id();?>; 
  document.getElementById("hdnmarks").innerHTML= marks; 
  document.getElementById('Form').submit();
}

change the Form name with your form name

Answer 2

your question have two parts

1)

But how should I access the marks as those were stored in the hidden field of index.php file?

the standard way is using a form

<form action="index.php" method=POST>
  <input type="hidden" name="hdnmarks" id="hdnmarks">
</form>

submit that form using a button or javascript to POST data to index.php

in index.php

<?php

$marks = $_POST['hdnmarks'];

?>

2)

I mean where and when should I put marks in the session before moving to results.php? you have to start session and make a session variable

index.php

<?php
session_start();
$marks = $_POST['hdnmarks'];
$_SESSION['marks'] = $marks;
?>

result.php

<?php session_start() ?>
...
//javascript code
var marks = <?php echo $_SESSION['marks'] ?>
...

NOTE: this isnt a very good way of passing data from one to another nor a good way of passing data from php to javascript and if you are using a database, session has no use in this as well

Answer 3

Just Javascript Use This:

function getCookie(name) {
  var value = "; " + document.cookie;
  var parts = value.split("; " + name + "=");
  if (parts.length == 2) return parts.pop().split(";").shift();
}

getCookie('PHPSESSID');