Robert Gravelle

My organization’s applications make extensive use of the RxJS library to subscribe to APIs that shuttle data to and from databases and information providers. If you’ve spent any amount of time on the Internet, you are no doubt all-too aware that making calls across the wire are prone to all manner of hiccups. These can […]

Did you know that every time you adjust your clock forward or backward for Daylight Savings Time (assuming your region follows it), you’re performing a Time Zone Conversion? In my case, I’m converting between Eastern Standard Time (EST) and Eastern Daylight Time (EDT). In fact, that’s what Time Zone Conversion is all about: adjusting your […]

Everyone knows what a bookmark is. It’s just a link to a Web resource that usually begins with the “http:”, “file:”, or “ftp:” protocol. There is another special prefix that browsers recognize as well: “javascript:”. It tells the browser to execute everything that comes after as JavaScript code. Bookmarks that employ the “javascript:” prefix are […]

Display JSON Data Using the JsRender Template Engine In my recent article on JavaScript Template Engines, we learned how Template Engines help us separate HTML from JavaScript, thereby reducing the outputting of HTML within JavaScript strings. Having observed their benefits and how to work with them, the time has come to try a light-weight but […]

In the “Advanced Data Hiding Techniques” article on emulating Class member encapsulation in JavaScript, we built on our Person class from the introduction article by adding a prototype interface, created a variable scope using a closure, as well as added constructor arguments and default values. Recall that Encapsulation is the ability of an object to […]

Fetching Extended Product Attributes using the WooCommerce API WooCommerce is a great eCommerce plugin for WordPress, made even greater by dozens of third-party extensions. The only drawback to using them is that there is no direct way to work with them via the WooCommerce API. In the Using the WooCommerce Rest API tutorial we learned […]

What to Test The W3C’s Web Content Accessibility Guidelines (WCAG – pronounced as a word “wuh-cag”) 1.0 consists of three priority levels that act as an industry standard. The first level, Priority 1, covers items on web pages that must be made accessible in order for individuals with disabilities to access the content at all. […]

Handling Errors when Processing WP_Ajax_Response XML Data A short time ago, I wrote how to deliver an XML response to the browser using WordPress’s built-in WP_Ajax_Response object. In that article, called Serve Up XML Using WP_Ajax_Response, we saw how to generate an XML-formatted response using the WP_Ajax_Response object, as well as how to parse the […]

Display Secure Atom Feeds in WordPress WordPress’s built-in ability to broadcast and subscribe to RSS (short for “Rich Site Summary” or “Really Simple Syndication”) and Atom feeds has led to a veritable “feeding” frenzy among WordPress users. This has in turn opened people’s servers and devices to malevolent individuals. The possibility exists for a hacker […]

As mentioned in my article entitled What’s New in HTML5 Forms: New Email, URL, and Telephone Input Types, the HTML5 spec introduces a number of updated form elements that promise to make web developers’ lives easier. Although browser support is still far from universal, there is little downside to using the new form controls–at least […]

When I was first starting my career as a Web Developer in the nineties, we were all about saving bandwidth. We compressed images, removed newline characters, whatever we could do to decrease the size of our downloads. As the World Wide Web grew to what it is today, bandwith increased, browsers became more efficient in […]

12/21/12 JSLint is a code quality tool for JavaScript developed by Douglas Crockford. He’s a senior JavaScript architect at PayPal and writer that helped popularize JavaScript Object Notation (JSON), among other things. Originally released in 2002, Crockford modeled JSLint on lint, an old C utility for catching common programming errors that were not detected by […]