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JavaScript

Posted by Will Waplington
Will Waplington
4,590 Points

JavaScripy, JSON, AJAX and PHP help

Hello, I am building a website to improve my programming confidence. I'm making great progress, but there is just one problem I can't seem to over some.

I have two variables in JavaScript that I require to access in a PHP file when a form is submitted to that PHP file. I have tried numerous attempts using various methods and I just keep failing.

2 Answers

Ron McCranie
Ron McCranie
7,837 Points
Ron McCranie
Ron McCranie
7,837 Points

Have you tried using the php inside the javascript like:

<script type="text/javascript">
       var message = 'start';
       <?php if(isset($_GET['message']) && $_GET['message'] != '') { echo "message = '".$_GET['message']."';\n"; } ?>
       alert(message);
    </script>
Will Waplington
Will Waplington
4,590 Points

Hi Ron, that did work but in the case I am trying to implement the Javascript is in a separate file to the PHP. I don't know if you could give any advice on this could you? I have tried using various AJAX and JSON methods (all work when working with the same file), but I cannot get them to work with separate JS files to PHP and then being able to use the PHP once it's been passed back to the server.

Will Waplington
Will Waplington
4,590 Points
Will Waplington
Will Waplington
4,590 Points

Hi Ron, that did work but in the case I am trying to implement the Javascript is in a separate file to the PHP. I don't know if you could give any advice on this could you? I have tried using various AJAX and JSON methods (all work when working with the same file), but I cannot get them to work with separate JS files to PHP and then being able to use the PHP once it's been passed back to the server.

Ron McCranie
Ron McCranie
7,837 Points

You can make your external javascript file a PHP file. Then that javascript can be dynamic every time you call it. Here's a post talking about how to do that: http://bit.ly/dynamic-javascript-with-php

PROS: 1) you can have javascript that is dynamically generated based on the php CONS: 2) your javascript can not be cached causing potential performance issues. 2) mixing front-end and back-end code can open up security risks.