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    <p>Look at this answer, it explains how to add custom HTML to the wordpress menus: <a href="https://stackoverflow.com/a/12251157/1627227">https://stackoverflow.com/a/12251157/1627227</a></p> <p><strong>EDIT:</strong></p> <p>I've put together an example to fit your question. You can place it into <strong>functions.php</strong>. Note the comments, they explain where to add your custom code.</p> <pre><code>class Custom_Walker_Nav_Menu extends Walker_Nav_Menu { function start_lvl(&amp;$output, $depth) { $indent = str_repeat("\t", $depth); //$output .= "\n$indent&lt;ul class=\"sub-menu\"&gt;\n"; // Change sub-menu to dropdown menu $output .= "\n$indent&lt;ul class=\"dropdown-menu\"&gt;\n"; } function start_el ( &amp;$output, $item, $depth = 0, $args = array(), $id = 0 ) { // Most of this code is copied from original Walker_Nav_Menu global $wp_query, $wpdb; $indent = ( $depth ) ? str_repeat( "\t", $depth ) : ''; $class_names = $value = ''; $classes = empty( $item-&gt;classes ) ? array() : (array) $item-&gt;classes; $classes[] = 'menu-item-' . $item-&gt;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-&gt;ID, $item, $args ); $id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : ''; $has_children = $wpdb-&gt;get_var("SELECT COUNT(meta_id) FROM wp_postmeta WHERE meta_key='_menu_item_menu_item_parent' AND meta_value='".$item-&gt;ID."'"); $output .= $indent . '&lt;li' . $id . $value . $class_names .'&gt;'; $attributes = ! empty( $item-&gt;attr_title ) ? ' title="' . esc_attr( $item-&gt;attr_title ) .'"' : ''; $attributes .= ! empty( $item-&gt;target ) ? ' target="' . esc_attr( $item-&gt;target ) .'"' : ''; $attributes .= ! empty( $item-&gt;xfn ) ? ' rel="' . esc_attr( $item-&gt;xfn ) .'"' : ''; $attributes .= ! empty( $item-&gt;url ) ? ' href="' . esc_attr( $item-&gt;url ) .'"' : ''; // Check if menu item is in main menu if ( $depth == 0 &amp;&amp; $has_children &gt; 0 ) { // These lines adds your custom class and attribute $attributes .= ' class="dropdown-toggle"'; $attributes .= ' data-toggle="dropdown"'; } $item_output = $args-&gt;before; $item_output .= '&lt;a'. $attributes .'&gt;'; $item_output .= $args-&gt;link_before . apply_filters( 'the_title', $item-&gt;title, $item-&gt;ID ) . $args-&gt;link_after; // Add the caret if menu level is 0 if ( $depth == 0 &amp;&amp; $has_children &gt; 0 ) { $item_output .= ' &lt;b class="caret"&gt;&lt;/b&gt;'; } $item_output .= '&lt;/a&gt;'; $item_output .= $args-&gt;after; $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args ); } } </code></pre> <p>After you have this in place, you have to go to the point where your menu (<code>wp_nav_menu()</code>) is called. In the answer I've linked to, there's the full function call to <code>wp_nav_menu</code>. However you'll have to add this line: <code>'walker' =&gt; new Custom_Walker_Nav_Menu</code> to the arguments array, to use your custom walker object on that specific menu.</p> <p>Hope you got it ;)</p>
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    1. POHow to add class and element to <a>-tag in sub-menu of "wp_nav_menu" in WordPress?
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    1. COSorry, i don't get it. Where should i insert the "class="dropdown-toggle" data-toggle="dropdown"" for a parent element? and where the b-tag inside the link?
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    2. COI've added an example which applies the changes you want to the code. If there's still anything unclear, would you please tell me, if you handcoded your theme, or if you're using a downloaded theme. Also the code requires, you're using the [WordPress Menus](http://codex.wordpress.org/Navigation_Menus) and `wp_nav_menu` to call your menus.
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    3. COAh, thanks a lot! But i need the class "dropdown-menu" only in parent menu items. The attribute "data-toggle="dropdown"" should only appear in links of parent menu items. And inside this link, i need this code: `<b class="caret"></b>` In the `<ul>` of the sub-menu i need the class "dropdown-menu" The question is: how can i check if there is a submenu or if the menu item is a parent item?
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