How to get JavaScript variables in PHP?

Question

I builded my own online javascript editor, but when I submit form, javascript not work. Here are my codes:

editor.php

<form action="show.php" method="post" target="window">
HTML code:<br />
<textarea name="html"></textarea><br />
JavaScript code:
<textarea name="javascript"></textarea><br />
<input type="submit" value="Test javascript" />
</form>
<iframe src="show.php" width="880" height="600" name="window"></iframe>

show.php

<html>
<head>
</head>
<body>
<?php
  if(isset($_POST['html'])) echo $_POST['html'];
  echo "<br><br>";
  if(isset($_POST['javascript'])){
    echo "<script>";
    echo $_POST['js'];
    echo "</script>";
  }
?>
</body>
</html>

HTML works well, but when I say something in javascript textarea, javascript will not work in iframe. Please, help me.

What specifically doesn't work? What do you expect to happen? — Andrew Marshall
– Andrew Marshall, Commented Dec 22, 2012 at 23:02
WARNING! You're passing unfiltered, unvalidated user input right back out. This can create a cross-site scripting vulnerability, easily allowing malicious users to hijack your site for their own purposes. Hell, you're even doing this intentionally! — Charles
– Charles, Commented Dec 22, 2012 at 23:03
I want something like jsfiddle.net where you can say your HTML and JavaScript code and you can see output — user1924244
– user1924244, Commented Dec 22, 2012 at 23:06
not going to work unless you do some ajax stuff (if you want it to work it live). You need to send your datas behind the scene , stock them , and when the ajax response returns reload the iframe with new datas. You need to store them serverside somehow. — mpm
– mpm, Commented Dec 22, 2012 at 23:11
Take a look at how sites like jsfiddle.net and jsbin.com do it. — Barmar
– Barmar, Commented Dec 22, 2012 at 23:29

VisioN · Accepted Answer · 2012-12-22 23:03:23Z

5

From your code I see no input field with name js, hence I assume the following:

echo $_POST['js'];

should be:

echo $_POST['javascript'];

Otherwise, your code should work fine.

answered Dec 22, 2012 at 23:03

VisioN

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1 Comment

Diego Pino Over a year ago

I think @vision is right. I tested your code and it works with this fix. Put an "alert('hello world')" in the JS code and you'll see that it works.

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