Normally, flat post types such as the Post post type do not have parents. However, some people like to use pages for their hierarchy and want posts to be children of these pages. Typically, these pages have a description and then a post list based off of a category.
While I personally do not recommend this type of site structure, Breadcrumb NavXT has supported Pages as the parent of Posts for quite some time. The caveat has always been that setting the parent of the post was an exercise left to the user. I’ve just written a fairly basic plugin that removes that makes things easier. All it does is add a Parent metabox with a pages drop down to the edit screen for posts.
Unlike Google’s Breadcrumb micodata format, Schema.org’s microdata format for breadcrumbs is very easy to implement. There is no need for nested tags, or overly verbose and redundant tags. Instead, there is just two modifications from the standard Breadcrumb NavXT setup.
Breadcrumbs are a property of the Schema.org WebPage CreativeWork type. The first thing you must do to use the Schema.org microdata is declare the body of the (x)HTML page to be of type WebPage. You’ll need to modify your current WordPress theme so that the opening body tag is:
This is a really easy one. However, as I’ve been asked about it several times in the past few weeks, I’m going to post about it.
One way of using an image rather than just text for the home breadcrumb was covered in the Vista-Like Breadcrumbs for WordPress article back in 2009. However, that guide is more or less an advanced topic, and directly accesses the bcn_breadcrumb_trail class, something that is currently not recommended.
Since at least Breadcrumb NavXT 3.0, the settings page allows you to use valid HTML in some fields. In the future this will be more obvious due to settings page tweaks as it is not exactly obvious that this is possible. There are really only three steps to changing from text to an image for the home breadcrumb:
Go to the Breadcrumb NavXT settings page (under Settings > Breadcrumb NavXT).
On the “General” tab, look for the “Home Template” option.
Replace the text value of the “Home Template” option with the valid HTML for your image. e.g. <img src="http://YOUR_URL/YOUR_HOME_IMAGE" alt="Home"/> where YOUR_URL is the URL for your website, and YOUR_HOME_IMAGE is the name of the image, including file extension.
That’s it, and it also works for the “Blog Breadcrumb” and “Mainsite Breadcrumb” in setups that have these breadcrumb types.
Since Breadcrumb NavXT 3.5.0, two WordPress actions have been added into Breadcrumb NavXT. They are the bcn_before_fill and bcn_after_fill actions. As their names suggest, the first runs at the beginning of bcn_breadcrumb_trail::fill(), and the second runs at the end of the same function. Both actions pass a reference to the current bcn_breadcrumb_trail instance into the hooked function. This post quickly covers a use case for the bcn_after_fill action.
Believe it or not, Google has a rich snippits format for breadcrumbs. A user on the WordPress.org forums pointed it out to me. Is it cool? Sure. Is it useful? In its current form, probably not, and this is why.