Posts tagged with: "jquery"

I love the any? and empty? convenience methods that Rails and Ruby provide, they make conditional statements much easier to read. I also really dislike the default method of checking this behavior in jQuery:

if ($('some.element').length > 0) {
  // ...do something
}

Well, luckily jQuery is ridiculously easy to extend, so why not just mix that functionality in with a couple of quick shot plugin methods? Just add this javascript sometime after you include jQuery:

jQuery.fn.any = function() {
  return (this.length > 0);
}

jQuery.fn.none = function() {
  return (this.length == 0);
}

That’s all you have to do! Now we can make the same call as before, but it looks a little cleaner:

if ($('some.element').any()) {
  // do something more readably...
}

UPDATE: Apologies, I added in the empty bit as a last-second update to the post and forgot to check and realize that empty() is part of jQuery core. Updated the name to none instead.

I just finished giving my “Hacking the Mid-End” talk at the Great Lakes Ruby Bash. It was a bit longer format, so I updated the slides a bit and added a third example to the code. The slides are embedded below and the new code is available in the GitHub Repository.

I’m still at the conference, but I wanted to post up the slides and code immediately! Enjoy.