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I am trying to add infinite scroll functionality into my Wordpress theme.

I started my exploration of infinite scroll in Wordpress by going here and here.

My question is, I don't understand the codex code, and I also don't understand why it appears that Jetpack's infinite scroll circumvents //calling admin-ajax as explained in their source code.

In Jetpack's implementation, I don't see any wp_ajax_nopriv() calls.

I also really don't understand why I could check if_admin() if the point is that the nopriv() runs for unauthenticated users.

if ( is_admin() ) {
    add_action( 'wp_ajax_my_frontend_action', 'my_frontend_action_callback' );
    add_action( 'wp_ajax_nopriv_my_frontend_action', 'my_frontend_action_callback' );
    add_action( 'wp_ajax_my_backend_action', 'my_backend_action_callback' );
    // Add other back-end action hooks here
} else {
    // Add non-Ajax front-end action hooks here
}

I've employed infinite scroll in a custom PHP application before, and it was very easy, but this is currently lost on me.

I simply want to understand how to generate an ajax url to the backend to connect to a function that will handle the output for me, by returning data to the view. How do I go about doing that for unauthenticated users?

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is_admin() runs when you are logged in as admin in the backend. So you need to do !is_admin() to run for normal users.

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