how to add dynamic focus to bootstrap navbar li?

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1. I notice you are using the old wp_list_pages function to create a navigation. I recommend you use the newer wp_nav_menu which works almost the same, but better (even has fallback support for wp_list_pages.

   Either way, what you are looking to add is a Walker to the array, just remember that in the walker you don’t pass a string, but an object.

   I successfully added my WordPress and Bootstrap menu to work well like so:

   Add this to your functions.php

   // Bootstrap Dropdown Menus
   
   add_action( 'after_setup_theme', 'bootstrap_setup' );
   
   if ( ! function_exists( 'bootstrap_setup' ) ):
   
   function bootstrap_setup(){
   
       add_action( 'init', 'register_menu' );
   
       function register_menu(){
           register_nav_menu( 'top-bar', 'Bootstrap Top Menu' ); 
       }
   
       class Bootstrap_Walker_Nav_Menu extends Walker_Nav_Menu {
   
   
           function start_lvl( &$output, $depth ) {
   
               $indent = str_repeat( "t", $depth );
               $output    .= "n$indent<ul class="dropdown-menu">n";
   
           }
   
           function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
   
               $indent = ( $depth ) ? str_repeat( "t", $depth ) : '';
   
               $li_attributes = '';
               $class_names = $value = '';
   
               $classes = empty( $item->classes ) ? array() : (array) $item->classes;
               $classes[] = ($args->has_children) ? 'dropdown' : '';
               $classes[] = ($item->current || $item->current_item_ancestor) ? 'active' : '';
               $classes[] = 'menu-item-' . $item->ID;
   
               $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
               $class_names = ' class="' . esc_attr( $class_names ) . '"';
   
               $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
               $id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : '';
   
               $output .= $indent . '<li' . $id . $value . $class_names . $li_attributes . '>';
   
               $attributes  = ! empty( $item->attr_title ) ? ' title="'  . esc_attr( $item->attr_title ) .'"' : '';
               $attributes .= ! empty( $item->target )     ? ' target="' . esc_attr( $item->target     ) .'"' : '';
               $attributes .= ! empty( $item->xfn )        ? ' rel="'    . esc_attr( $item->xfn        ) .'"' : '';
               $attributes .= ! empty( $item->url )        ? ' href="'   . esc_attr( $item->url        ) .'"' : '';
               $attributes .= ($args->has_children)        ? ' class="dropdown-toggle" data-toggle="dropdown"' : '';
   
               $item_output = $args->before;
               $item_output .= '<a'. $attributes .'>';
               $item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
               $item_output .= ($args->has_children) ? ' <b class="caret"></b></a>' : '</a>';
               $item_output .= $args->after;
   
               $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
           }
   
           function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output ) {
               if ( !$element )
                   return;
               $id_field = $this->db_fields['id'];
               //display this element
               if ( is_array( $args[0] ) ) 
                   $args[0]['has_children'] = ! empty( $children_elements[$element->$id_field] );
               else if ( is_object( $args[0] ) ) 
                   $args[0]->has_children = ! empty( $children_elements[$element->$id_field] ); 
               $cb_args = array_merge( array(&$output, $element, $depth), $args);
               call_user_func_array(array(&$this, 'start_el'), $cb_args);
               $id = $element->$id_field;
               // descend only when the depth is right and there are childrens for this element
               if ( ($max_depth == 0 || $max_depth > $depth+1 ) && isset( $children_elements[$id]) ) {
                   foreach( $children_elements[ $id ] as $child ){
                       if ( !isset($newlevel) ) {
                           $newlevel = true;
                           //start the child delimiter
                           $cb_args = array_merge( array(&$output, $depth), $args);
                           call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
                       }
                       $this->display_element( $child, $children_elements, $max_depth, $depth + 1, $args, $output );
                   }
                       unset( $children_elements[ $id ] );
               }
               if ( isset($newlevel) && $newlevel ){
                   //end the child delimiter
                   $cb_args = array_merge( array(&$output, $depth), $args);
                   call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
               }
               //end this element
               $cb_args = array_merge( array(&$output, $element, $depth), $args);
               call_user_func_array(array(&$this, 'end_el'), $cb_args);    
           }   
       }
   }
   endif;
   

   I found how to do this from a gist that John Megahan has here.

   Your PHP would look like this instead of wp_list_pages:

   <?php            
     $main_menu = array(
       'menu' => 'main-menu',
       'container' => false,
       'depth' => 2,
       'walker' => new Bootstrap_Walker_Nav_Menu()
     );
     wp_nav_menu( $main_menu );
   ?>
   

   Notice that I’m using the ‘menu’ and setting it to ‘main-menu’ (this is the name of my menu that I can manage through the WP dashboard). Check out the codex to see exactly what parameters you can pass on wp_nav_menu … but the bottom line here I think is that the Walker should help you extend to use the .active class that Bootstrap uses.

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