js var from php var SOLVED with thanks

[niche]

In this external learning script (saved as a .js), why does the string of the php code display instead of the value of the url variable?

<?php$url = "http://localhost";?> var url = "<?php echo $url; ?>"; alert(url);

Edited October 1, 2012 by niche

[skaterdav85]

The code hasn't run through the PHP interpreter Save your file with a .php extension, and if you have a local web server with PHP installed, you will see the PHP code being interpreted.

[thescientist]

(saved as a .js)

well, there's your first problem. you would have to do something like this

<?php $url =  'http://localhost'; echo '<script type="text/javascript">';echo 'var newUrl = ' . $url;echo 'alert(newUrl)';echo '</script>'; ?>

Edited October 1, 2012 by thescientist

[niche]

Thanks big dave and thescientist. If that's as bad as the ridicule gets, I know I'm getting off easy. I work with very few external javascripts consequently I just couldn't see it. This just reminds me that I still haven't broken that habit I have of seeing what I expect to see. Six eyes were obviously better than two. EDIT Assuming we're all human (have to practice being alert to that seeing what I expect to see thing). lol.

Edited October 1, 2012 by niche

[Ingolme]

Even if you give a file a .php extension you can still load it as a Javascript file using the <script> tag. Just to ensure it's interpretted correctly you can send a javascript mime type header. <?phpheader('Content-type: text/javascript');?> In the HTML file:<script src="file.php"></script>

[niche]

Wow. Didn't know that. So, in the situation I'm working with, I would substitute <script type="text/javascript" src="file.php"></script> for <script type="text/javascript" src="subcat.js"></script> in the head of my index.php and run the javascript in subcat.js out of file.php. Is that what you're saying?

Edited October 1, 2012 by niche

[niche]

Building on post #6 How would the file.php look? I know this isn't right, but how should it read?

<?phpheader('Content-type: text/javascript');$url = "http://localhost";echo '<script type="text/javascript">';  var url = "<?php echo $url; ?>";  alert(url);echo '</script>';?>

[niche]

php within javascript within php is brand new to me as of today. Who would've thunk?

<?php$url = "http://localhost";header('Content-type: text/javascript');echo 'var url = "' . $url . '";';echo 'alert(url);';?>

Thanks ingolme