JC Fant IV
About
JC Fant IV is a Software Engineer at Amazon.com. He has been working as a Web Developer for the last 10 years. Currently he is diving into performance and other technologies around JavaScript.
Current Projects
Currently I am working on test for JSPerf and what it means for Javascript in General. Many things we think we know to be true, may in the end be incorrect. Do this, not that!
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Tag Archives: jQuery
Getting A Class From a DOM Element
Lately, if I am searching for a way to do something in Javascript the only results I am getting ways of doing the procedure using jQuery. While, its true jQuery is pretty much the de facto standard for writing JavaScript anymore, understanding the underlying technology is a must. As well as alot of times, I [...]
Writing and Updating DOM Elements in a Frame
Handling writing and updating objects in an iframe can be bothersome in most browsers. Sure things like jQuery tend to help, but not always. A normal way to access a frame in jQuery is below: $("#FRAME").contents() Now, lets say you actually want to get another element inside of the frame, lets get the HEAD element. [...]
Expanding the jQuery Plugin Development Pattern
Doing research on a recent project, I came across an article by Mike Alsup on a "jQuery Plugin Development Pattern". If you haven't seen it already its worth a trip to learningjquery.com to checkout the implementation of his pattern. "There are a few requirements that I feel this pattern handles nicely:" Claim only a single [...]
jQuery 1.5 Deferreds
Eric Hynds on his blog the other day gave a very good run down of jQuery 1.5 Deferreds. From the post: Deferreds, new in jQuery 1.5, decouple logic dependent on the outcome of a task from the task itself. They’re nothing new to the JavaScript scene; Mochikit and Dojo have implemented them for some time, [...]
$(“#ID”) is fast enough
We all know that the fastest selector to use is the ID. Something like $("#id") is better than using a class. However, after looking at the last test we did on The Great Assumption - JavaScript I noticed a large discrepancy in $("#ID") versus the native document.getElementById(). Now, I always assumed it was slower, but [...]
The Great Assumption – Javascript
A couple of weeks ago I was sitting down with a Google Frontend Engineer friend of mine, talking about some of the JavaScript best practices we all have come to know and abide by. I found myself in agreement with 90% of everything we were talking about. However, something kept eating at me. Why do [...]
JavaScript Performance Testing – An Indispensable Tool
Over the course of the last couple of weeks I have been looking into various tools to test Javascript Pefromance. I needed a way to test various JavaScript code snippets to see the overall latency/run time of each. I started looking for a way to manage the tests and be able to reference them in [...]
Underscore.js Templates
After the post about why Underscore.js, I think it is best to follow up on one of the best parts of the library. Now, I haven’t had a chance to go through the new templating in jQuery, however what I have found with Underscore.js has allowed me to complete some very complicated tasks in my [...]
Underscore.js
Coming from a more technical backend role, and moving into JavaScript many people tend to look for very common functions to make their life easier. However, since JavaScript is considered a "functional" programming language, most of those little conveniences are currently unsupported. So I went searching a bit. Turns out there is a nice little [...]
Finding an Element outside of your current iframe
Sometimes you are working within an iframe and need to be able to check for an element outside of that frame. It sounds simple enough, and you are right. The following bit of code grabs an element outside of your current iframe: if (typeof window.parent != "undefined"){ window.parent.document.getElementById("SOMEID"); } Pretty simple! Now, lets look at [...]