Alternative ways of accessing PHP variables from Javascript file

Question

I have a Javascript file with the code I need to run my PHP project, but since it's a .js file I can't embed the PHP variables (such paths, config variables etc...) using the the <?php ... ?> way.

So I thought that one possible way would be using AJAX requests or a REST API.

Then two questions came in my mind:

Could that lead to some performance issues? - I have to wait the server's response so I guess it's yes.
Which are the possible alternatives?

Edit:

The config variables are stored in a PHP class for easy access from the PHP code. If you can tell me a better way I would really appreciate it.

You could add all your variables as a json string or whatever to your HTML page and access them with JS. — putvande
– putvande, Commented Dec 30, 2013 at 21:40
Performance issues don't really come to mind if you're just grabbing a PHP variable, it's basically instantaneous (depending on the server speed...I guess my point was it's not like your querying the DB for a massive amount of data) — tymeJV
– tymeJV, Commented Dec 30, 2013 at 21:40
Right now I have a file that is included in the HTML head which acts as communication between the PHP and javascript, so I can have the heavy work in javascript in a separated javascript.js. However this is not the best as I'm mixing PHP, HTML and javascript in just few lines, so good question +1 — Francisco Presencia
– Francisco Presencia, Commented Dec 30, 2013 at 21:40

Suthan Bala · Accepted Answer · 2013-12-30 21:45:29Z

2

You can put the following in your .htaccess file, then your javascript files should be able to compile php inside js.

<FilesMatch "\.(js)$">
AddHandler application/x-httpd-php .js
</FilesMatch>

answered Dec 30, 2013 at 21:45

Suthan Bala

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Jite · Accepted Answer · 2013-12-30 21:40:57Z

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You could create a php file that outputs javascript and use php code inside it:

<?php header('Content-Type: application/javascript'); ?>
alert('<?php echo "test"; ?>');

answered Dec 30, 2013 at 21:40

Jite

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3 Comments

siannone Over a year ago

And now the question is: Will that work with RequireJS? I don't know but i can try it (and I will tomorrow).

Jite Over a year ago

The browser will see it as a javascript file, so if including a js file from the server works with RequireJS this should too.

siannone Over a year ago

Yep, I know that, but I'm not sure how RequireJS configuration will do. I'll let you know if it works :)

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