Add this to your plugin file: (you can also add it on the theme’s functions file)
function ajax_wp_editor()
{
?>
your html form here
<?php
}
//for all users
add_action('wp_ajax_nopriv_ajax_wp_editor', 'ajax_wp_editor');
// for logged in users
add_action('wp_ajax_ajax_wp_editor', 'ajax_wp_editor');
Request Ajax using this URL:
[BLOG_ADDRESS]/wp-admin/admin-ajax.php?action=ajax_wp_editor