The menu scrolls to the top of the page when the script is triggered, how to fix it?

Question

JavaScript

Hello, there is a fixed menu, but when you click on the tab switch for example (or when you click on the search), the menu just scrolls up and that's it.

The problem is in this code

container.addEventListener( clickevent, function( ev ) {
            classie.add(container, 'transform');
      if( classie.has( perspectiveWrapper, 'animate') ) {
        var onEndTransFn = function( ev ) {
          if( support && ( ev.target.className !== 'container' || ev.propertyName.indexOf( 'transform' ) == -1 ) ) return;
          this.removeEventListener( transEndEventName, onEndTransFn );
          classie.remove( perspectiveWrapper, 'modalview' );
                    classie.remove(container, 'transform');
          // mac chrome issue:
          document.body.scrollTop = document.documentElement.scrollTop = docscroll;
          // change top of contentWrapper
          contentWrapper.style.top = '0px';
        };
        if( support ) {
          perspectiveWrapper.addEventListener( transEndEventName, onEndTransFn );
        }
        else {
          onEndTransFn.call();
        }
        classie.remove( perspectiveWrapper, 'animate' );
      }
    });

If you remove it, everything is fine, the menu remains fixed. Please tell me how to fix this? Thanks in advance

classie.add(container, 'transform');