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I am trying to separate a part of my code from the functions.php file to make it easier to understand and maintain. So I want to put all my "ajax" related code in a different PHP file.

Here is the require in my functions.php file:

require_once( __DIR__ . '/includes/ajax.php');

And here is some of the content of the ajax.php file:

function theme_enqueue_ajax(){
    wp_localize_script( 'myJSScript', 'ajaxUrl', array( 'url' => admin_url( 'admin-ajax.php' ) ) );
}
add_action( "wp_enqueue_scripts", "theme_enqueue_ajax");

If I put the code from ajax.php directly in my functions.php file, everything works fine, but once I move it to ajax.php the ajaxUrl variable doesnt exist anymnore.

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Of course there can be many reasons, but if you require ajax.php in functions.php above the hook with wp_enqueue_script( 'myJSScript' ...); - it will not work.

wp_localize_script()
Works only if the script has already been added.

function theme_enqueue_ajax(){
    //try to add wp_enqueue_script( 'myJSScript' ...); here
    wp_localize_script( 'myJSScript', 'ajaxUrl', array( 'url' => admin_url( 'admin-ajax.php' ) ) );
}
add_action( "wp_enqueue_scripts", "theme_enqueue_ajax");
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  • Well, that was it! I feel somewhat dumb for not noticing it myself, but thanks! Commented May 13, 2021 at 11:47

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