Enqueueing scripts if a file exists - php

Question

I work with wordpress on my child theme.
My site is installed into mydomain.xx/install, but runs from mydomain.xx.
My functions.php works and looks like this:
<?php
/* Script in head */
function carica_scripts() {
/* Common scripts */
// insert scripts here, if some
/* Page-based script */
$pageId = get_the_ID();
$pageType = get_post_type();
$myBaseURL = get_stylesheet_directory_uri() . '/js/';
/* Page-type scripts */
if($pageType == "product") {
wp_enqueue_script('CondAll', $myBaseURL . 'CondAll.js', array('jquery'));
wp_enqueue_script('CondShipping', $myBaseURL . 'CondShipping.js', array('jquery'));
}
/* Page-id scripts */
if($pageId == "1") {
wp_enqueue_script('Cond1', $myBaseURL . 'Cond1.js', array('jquery'));
}
if($pageId == "294") {
wp_enqueue_script('Cond294', $myBaseURL . 'Cond294.js', array('jquery'));
}
if($pageId == "318") {
wp_enqueue_script('Cond318', $myBaseURL . 'Cond318.js', array('jquery'));
}
if($pageId == "232") {
wp_enqueue_script('Cond232', $myBaseURL . 'Cond232.js', array('jquery'));
}
/* END of page-based script */
}
add_action( 'wp_enqueue_scripts', 'carica_scripts' );
?>
What I want to achieve is avoiding all the ifs on $pageId, and to auto-enqueue jQuery script CodXXX.js on page id XXX if the relative file exists in the subdirectory /js/ of my child theme.

Answer 1

file_exists() expects an absolute path to a file rather than a URL.
Use get_stylesheet_directory() to get the path you need. Also get_the_ID() shouldn't be used outside of the loop.
Example:
/*
* Enqueue CondXXX.js on page XXX if file CondXXX.js exists
*/
function carica_scripts() {
global $post;
// Check we're on a page.
if ( ! is_page() ) {
return false;
}
// Build the filename to check.
$handle = 'Cond' . $post->ID;
$relpath = '/js/' . $handle . '.js';
// Get path + url to file.
$file_path = get_stylesheet_directory() . $relpath;
$file_url = get_stylesheet_directory_uri() . $relpath;
if ( file_exists( $file_path ) ) {
wp_enqueue_script( $handle, $file_url, array( 'jquery' ) );
}
}
add_action( 'wp_enqueue_scripts', 'carica_scripts' );

Answer 2

The answer given by Nathan Dawson does not work in my case, I had to do some workarounds. I ended up with the following code:
/* Load scripts in head */
function carica_scripts() {
/* Common scripts */
/* END of common scripts */
/* Page-based script */
$pageId = get_the_ID();
$pageType = get_post_type();
$handle = 'Cond' . $pageId;
$file = $handle .'.js';
$relPath = '/js/';
$styleSheet_path = get_stylesheet_directory();
$domain_base = 'mydomain.it/public_html/';
$start_pos = strpos ( $styleSheet_path, $domain_base) + strlen ($domain_base);
$basePath = substr ( $styleSheet_path, $start_pos); // I need everything after 'mydomain.it/public_html/'
$file_path = $basePath. $relPath . $file;
$enqueue_path = get_stylesheet_directory_uri() . $relPath;
$enqueue_file = $enqueue_path . $file;
/* if page-type is ... (product, in this case) */
if($pageType == "product") {
wp_enqueue_script('CondAll', $enqueue_path . 'CondAll.js', array('jquery'));
wp_enqueue_script('CondShipping', $enqueue_path . 'CondShipping.js', array('jquery'));
}
/* If page id is... (1, in this case - because page 1 is not product but I want CondAll here too) */
if($pageId == "1") {
wp_enqueue_script('CondAll', $enqueue_path . 'CondAll.js', array('jquery'));
}
/* auto load script CondXXX.js from subdir js/ if file exists */
if ( file_exists( $file_path ) ) {
wp_enqueue_script( $handle, $enqueue_file, array( 'jquery' ) );
}
/* END of page-based script */
}
add_action( 'wp_enqueue_scripts', 'carica_scripts' );
Now the the scripts load.