Articles for developers with how to posts, case studies, code snippets, and more.
Compatibility Notice: The following article and code applies to pre-WooCommerce 2.1 only. It is not compatible with WooCommerce 2.1+ As of version 1.6.5.2 at least, WooCommerce does not provide a way to automatically calculate the Line Subtotal and Line Total values for a given product quantity, when creating or updating an order through the Order Admin: As shown in the above image, there’s a button to calculate the line taxes for the order items, as…
A common WooCommerce question lately has been how to hide the “Free” price label in the product/category/shop pages. Thanks to WooCommerce’s judicious use of filters/actions, this is very easy request, yet if you’re new to WordPress/WooCommerce you might not necessarily know exactly where to look. Well look no further, because here’s an easy way to suppress that “Free” notice for regular/variable products: add_filter( ‘woocommerce_variable_free_price_html’, ‘hide_free_price_notice’ ); add_filter( ‘woocommerce_free_price_html’, ‘hide_free_price_notice’ ); add_filter( ‘woocommerce_variation_free_price_html’, ‘hide_free_price_notice’ ); /**…
The purpose of this article is to describe the WordPress XML-RPC API, explain how to use it, and demonstrate how to extend it to create custom API methods for interacting programmatically with WordPress. I assume a relative unfamiliarity with XML-RPC in general, WordPress XML-RPC, and spend time first covering the basics, if you want to skip straight to the section on extending the WordPress XML-RPC API, feel free to. What is XML-RPC? As defined by…
Writing a custom plugin that can be translated by WPML (WordPress Multilingual) using .mo files is actually quite simple once you figure out how to generate the .mo file. My first attempt to internationalize my plugin with WPML however was less than successful, WPML would not localize my plugins text strings. I knew my .mo file was correct, and could be loaded by WordPress because when I set WPLANG to my target locale in wp-config.php,…
WooCommerce provides some coarse control over displaying sub categories in your shop/category pages with the “Show subcategories on category pages” and “Show subcategories on the shop page” options on the WooCommerce > Settings > Catalog > Catalog Options section. These controls are all-or-nothing though: show all subcategories on the category pages, or show all subcategories on the shop page. If you want finer-grained control, for instance displaying only certain subcategories on the shop or particular…
This article details one method of creating a custom WordPress post type with the ability to upload and attach images using the built-in WordPress Media browser. This piece does not cover all the details and nuances of creating a custom post type, as this is covered well elsewhere. In addition to highlighting the most important methods and code required, I have attached a fully functional demo plugin which you may feel free to download and…
Sometimes when developing a WooCommerce plugin you want to output a snippet of HTML, and do so in such a way that the content can be easily overridden by a theme. It’s part of the process of crafting a well-engineered, customizable plugin. The best way to achieve this is by using WooCommerce’s own templating mechanism, and what once took some effort and some filters is now a snap thanks to one of the recent WooCommerce…
Adding one of those nifty WordPress admin menu notification number bubbles to your custom menu/submenu is quite easy. Just append the following snippet to your menu/submenu name and you’re good to go:
I always prefer it when plugins make it as easy as possible to find their configuration page. When I install a new plugin the last thing I want to do is hunt around for some hidden menu item, I want to play around with my new toy! And what better place to link to a plugin’s configuration than right from the admin Plugins page where the plugin is activated, deactivated or (the horror!) deleted. These…
The following are some techniques I use nearly every day for debugging WordPress and WooCommerce, and can be used for plugin or theme development equally. Echoing or printing to the screen will only get you so far when debugging, especially in a complex framework like WordPress; to really understand the code flow, and to trace and fix issues, you need to be able to log messages to a file. For this WordPress makes use of…