How to pass Javascript variables to PHP variables


We'd like to perform the following code activities:

- Get values from text boxes of FORMS using javascript and XHTML code (we can do it successfully and we print out them to verify)
- We want to assign these values into PHP avariables like this

       $author = document.getElementById( 'author' ).value;
         // call php function

We tried and error occurs --> invalid call document.getElementById( 'author' ).value;
How can we do it?

If you've some idea, please help.

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You are actually using a javascript command into php code. That won't work.

It depends on the method you are using on your form. See below:

$author = $_POST['author'];
$author = $_GET['author'];

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Beverley PortlockCommented:
There are two ways to do this, one is fairly simple.

If you have a form that will be submitted then you can create a dummy DIV in the form and inject  <INPUT ../> tags in to the DIV so that when the form is submitted then your javascript variables go with the form

The second method is to communicate directly with the server using AJAX via the XMLHTTP object. This is more complicated but it requires no pressing of submit buttons.

Otherwise there is no DIRECT way to subsitiute javascript values into PHP variables as Javascript is a clientside script and PHP is a server-side script. They run only completely different computers.

Beverley PortlockCommented:
Here is a link to using an AJAX solution. It looks winded because I went out of my may to explain how it works. It could be adapted to your problem.
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