How to change the styles of the active link in the menu in MODX?

Question

MODX

The output of resources is done through pdoResourses
Each article has its own link in the menu. How can I change the appearance of the link (add class="active") if it is currently open, active?

<ul class="nav-main ">


              
</ul>

<li>
     <a href="">
             <span class="xn-text "></span>
            <img class="icons_menu" src="">
      </a>
    </li>

Answer 1

In the chunk add
+ why not PDOmenu ?