Command Line Polling
In an ideal world, we wouldn't have to poll for anything; we would always have events to trigger other functions. This isn't an ideal world, however, so it's important to know how to poll in multiple programming languages. I've covered JavaScript polling (with and without Promises), but what about command line polling? For example, ensuring MYSQL is up before attempting to perform more operations.
Here's the basic syntax:
# while ! (command here); do
while ! mysql -uroot; do
sleep 1
done
The example above performs the mysql -uroot operation (which will fail until mysqld is up) every second. Keep in mind the poll operation you run should be as simple as possible, just enough to know that what you want to use is available!
![fetch API]()
One of the worst kept secrets about AJAX on the web is that the underlying API for it, XMLHttpRequest, wasn't really made for what we've been using it for. We've done well to create elegant APIs around XHR but we know we can do better. Our effort to...
![JavaScript Promise API]()
While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why "hold up the show" when you can trigger numerous requests at once and then handle them when each is ready? Promises are becoming a big part of the JavaScript world...
![CSS content and attr]()
CSS is becoming more and more powerful but in the sense that it allows us to do the little things easily. There have been larger features added like transitions, animations, and transforms, but one feature that goes under the radar is generated content. You saw a...
![Spyjax: Ajax For Evil Using Dojo]()
The idea of Spyjax is nothing new. In pasts posts I've covered how you can spy on your user's history with both MooTools and jQuery. Today we'll cover how to check user history using the Dojo Toolkit.
The HTML
For the sake of this...
