Add Content to DIV with Specific Class Name - php

Question

I am trying to alter Wordpress <?php wp_nav_menu( array( 'theme_location' => 'primary' ) ); ?> default output. What I wish to do:
Pages that have a submenu looks like this:
<li class="menu-item-has-children">
Page with Submenu
<ul class="sub-menu">
<li class="menu-item-has-children">
Level 1 Submenu Page
<ul class="sub-menu">
<li>Level 2 Submenu Page</li>
</ul>
</li>
</ul>
</li>
What I need it to look like:
<li class="menu-item-has-children">
Page with Submenu <i class="fa fa-caret-down"></i>
<ul class="sub-menu">
<li class="menu-item-has-children">
Level 1 Submenu Page <i class="fa fa-angle-right"></i>
<ul class="sub-menu">
<li>Level 2 Submenu Page</li>
</ul>
</li>
</ul>
</li>
Any ideea on how can I achieve this by CSS, jQuery or PHP?

Answer 1

If you're adding the extra markup just to add a down arrow, why not do this with CSS:
.menu-item-has-children > a {
padding-right:20px;
position:relative;
}
.menu-item-has-children > a:after {
content:"";
border:5px solid transparent;
border-top-color:grey;
position:absolute;
right:0;
top:50%;
}
Here's a JSfiddle.

Answer 2

To answer your specific question: you'll need PHP. Then some CSS styling.
To be more specific, you'll need to use a Custom Walker. With a custom walker, you can tell WordPress to use different styling for a menu, then another style for a sub-menu and so on, which is your exact case. You even have an example code there, which I'm pasting below:
class themeslug_walker_nav_menu extends Walker_Nav_Menu {
// add classes to ul sub-menus
function start_lvl( &$output, $depth = 0, $args = array() ) {
// depth dependent classes
$indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent
$display_depth = ( $depth + 1); // because it counts the first submenu as 0
$classes = array(
'sub-menu',
( $display_depth % 2 ? 'menu-odd' : 'menu-even' ),
( $display_depth >=2 ? 'sub-sub-menu' : '' ),
'menu-depth-' . $display_depth
);
$class_names = implode( ' ', $classes );
// build html
$output .= "\n" . $indent . '<ul class="' . $class_names . '">' . "\n";
}
// add main/sub classes to li's and links
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
global $wp_query;
$indent = ( $depth > 0 ? str_repeat( "\t", $depth ) : '' ); // code indent
// depth dependent classes
$depth_classes = array(
( $depth == 0 ? 'main-menu-item' : 'sub-menu-item' ),
( $depth >=2 ? 'sub-sub-menu-item' : '' ),
( $depth % 2 ? 'menu-item-odd' : 'menu-item-even' ),
'menu-item-depth-' . $depth
);
$depth_class_names = esc_attr( implode( ' ', $depth_classes ) );
// passed classes
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$class_names = esc_attr( implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item ) ) );
// build html
$output .= $indent . '<li id="nav-menu-item-'. $item->ID . '" class="' . $depth_class_names . ' ' . $class_names . '">';
// link 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 .= ' class="menu-link ' . ( $depth > 0 ? 'sub-menu-link' : 'main-menu-link' ) . '"';
$item_output = sprintf( '%1$s<a%2$s>%3$s%4$s%5$s</a>%6$s',
$args->before,
$attributes,
$args->link_before,
apply_filters( 'the_title', $item->title, $item->ID ),
$args->link_after,
$args->after
);
// build html
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
it looks you know some coding, so I won't extend on this, but it's easy to see you only need to modify this:
$classes = array(
'sub-menu',
( $display_depth % 2 ? 'menu-odd' : 'menu-even' ),
( $display_depth >=2 ? 'sub-sub-menu' : '' ),
'menu-depth-' . $display_depth
);
and/ or
// depth dependent classes
$depth_classes = array(
( $depth == 0 ? 'main-menu-item' : 'sub-menu-item' ),
( $depth >=2 ? 'sub-sub-menu-item' : '' ),
( $depth % 2 ? 'menu-item-odd' : 'menu-item-even' ),
'menu-item-depth-' . $depth
);
according to your needs. However, I STRONGLY RECOMMEND you read the page so you understand how it works, how you use it and when to use it.