WP Ajax check is user logged in - http://wordpress.stackexchange.com/questions/69814/check-if-user-is-logged-in-using-jquery/69819#69819
<?php
function ajax_check_user_logged_in() {
echo is_user_logged_in()?'yes':'no';
die();
}
add_action('wp_ajax_is_user_logged_in', 'ajax_check_user_logged_in');
add_action('wp_ajax_nopriv_is_user_logged_in', 'ajax_check_user_logged_in');
?>
var data = {
action: 'is_user_logged_in'
};
jQuery.post(ajaxurl, data, function(response) {
if(response == 'yes') {
// user is logged in, do your stuff here
} else {
// user is not logged in, show login form here
}
});