ajax wp_query conditional tags not working

Question

I'm trying to ajax wp_query, I got success getting posts for home page with the following code.

Then I added conditional tags to modify the query for the other pages like Category page

the problem that all conditional tags are not working inside this function, it keeps giving me the same posts of the home page.

I'm using this code in function.php file:

add_action( 'wp_ajax_wp_ajax_posts', 'wp_ajax_posts_init' );
function wp_ajax_posts_init() {
  /** Made Query */
    $numPosts = (isset($_POST['numPosts'])) ? $_POST['numPosts'] : 0;
    $page = (isset($_POST['pageNumber'])) ? $_POST['pageNumber'] : 0;
    $args = array(
        'posts_per_page'=>  $numPosts,
        'paged'         =>  $page,
    );
if(is_post_type_archive('projects')){
    $args['post_type'] = 'projects';
}
if(is_category()){
    $category   =   get_category( get_query_var( 'cat' ) );
    $cat_id     =   $category->cat_ID;
    $args['cat'] = $cat_id;
}
$theme_post_query = new WP_Query( $args );
while( $theme_post_query->have_posts() ) : $theme_post_query->the_post();
//--html content
endwhile;   
wp_reset_query();
}

the weird thing that conditional tags are working in all other functions like where I enqueue the ajax script

if(is_home() || is_category() || is_search() || is_tag() || is_post_type_archive('projects')){
    wp_register_script( 'ajaxLoop-js', "{$ss_url}/js/ajaxLoop.js", array('jquery'));
    $php_array = array( 'admin_ajax' => admin_url( 'admin-ajax.php' ) );
    wp_localize_script( 'ajaxLoop-js', 'php_array', $php_array );
    wp_enqueue_script( 'ajaxLoop-js' );
}

any ideas how to get conditional tags work at wp_ajax_posts_init()?

Answer 1

An ajax request happens in completely separate load, it will have no awareness about which page you are making request from and will have no main query or query conditionals.

If you want to retrieve something based on the context of page you are making request from then you need to pass that information in your ajax request and retrieve posts based on it.