php - base_url doesn't work in external js and css file -

i trying call "base_url()" inside of external .js file. 'test.js' file path "js/test.js".

my test.js code was:

    function download(s){         var w=window.open('<?php base_url(); ?>home/download?f='+s+'.ogg','download','height=100,width=100');     } 

and linked file(my js file working fine when trying simple javascript codes) :

<script src="<?php echo base_url(); ?>js/test.js" type="text/javascript"></script> 

but said access denied , asked server permission.

i tried 'site_url()' too, tried echo "hello" in 'download' function didn't work. when add code inside of header.php view file like:

<script type="text/javascript">     function download(s){         var w=window.open('<?php base_url(); ?>home/download?f='+s+'.ogg','download','height=100,width=100');     } </script> 

then worked.

and in case of external css when write:

background:url('<?php base_url(); ?>images/side.png'); 

that doesn't work. if write:

background:url('../images/side.png'); 

then works.

so how can call "base_url()" inside of external .js file , .css file ?

you can't call base_url() in javascript / css file.

you need put relative path in these js/css files. php scripts aren't aren't run unless they're in .php file.