<?php // Do not copy this.
function custom_footer_scripts() {
if ( is_home() || is_front_page() ) :
?>
<script type="text/javascript">
(function($){
// Cache selectors
var lastId,
topMenu = $("#menu-main-navigation"),
topMenuHeight = topMenu.outerHeight()+1,
// All list items
menuItems = topMenu.find("a"),
// Anchors corresponding to menu items
scrollItems = menuItems.map(function(){
var item = $($(this).attr("href"));
if (item.length) { return item; }
});
// Bind to scroll
$(window).scroll(function(){
// Get container scroll position
var fromTop = $(this).scrollTop()+topMenuHeight;
// Get id of current scroll item
var cur = scrollItems.map(function(){
if ($(this).offset().top < fromTop)
return this;
});
// Get the id of the current element
cur = cur[cur.length-1];
var id = cur && cur.length ? cur[0].id : "";
if (lastId !== id) {
lastId = id;
// Set/remove active class
menuItems
.parent().removeClass("current-menu-item")
.end().filter("[href='#"+id+"']").parent().addClass("current-menu-item");
}
});
})(jQuery);
</script>
<?php
endif;
}
add_action( 'wp_footer', 'custom_footer_scripts', 99 );