jquery $.post

Are you receiving any JS errors?

This should answer your question:

https://codex.www.ads-software.com/Function_Reference/wp_enqueue_script#jQuery_noConflict_Wrappers

@andrew, nope. No errors. I fixed the URL problem, still it seems drugi.php doesn’t even get activated.
@samuel, wrappers didn’t solve the problem.

Sorry, now it does output some error, but the error’s about wpdb insert. I don’t know what made it change…

I’m getting this:

Fatal error: Call to a member function insert() on a non-object in /home/a2865846/public_html/wp-content/themes/twentyeleven-dijete/trazilica_jedan.php on line 4

This is the whole code from trazilica_jedan.php

<?php
if (isset($_POST['znamen'])){
  $lepo = $_POST['znamen'];
  $update = $wpdb->insert('users', array('user_id' => 12, 'uporabniki' => 'trajj'),array("%d", "%s"));
  echo "$update";
}
else {
  echo "napaka! :(";
}
?>

It is activated from the template file trazilica_dva.php. This is the part:

$.post('https://sklopnjak.uni.me/wp-content/themes/twentyeleven-dijete/trazilica_jedan.php', {znamen:znamen},function (data){
			$('#save_status').text(data);
			 });

Some ideas?

You’re calling a PHP file in the theme directly and then attempting to use the $wpdb object, but because you called the file directly, WordPress isn’t loaded, and $wpdb is undefined.

You need to learn to use AJAX calls correctly in WordPress:
https://codex.www.ads-software.com/AJAX_in_Plugins

Hm, I read it and tried to alter the code, but it didn’t work…
Any further help would be greatly appreciated.