Web Inspector and Firefox Dollar Functions
Many of you probably didn't know this but WebKit-based like Safari and Chrome, in addition to Firefox, contain special dollar functions within the console object that allow you to grab elements within the current page. While I've not determined the use of each method, a few of them are obvious:
// Dollar method
// Returns an element by ID
$ = function (id) {
return document.getElementById.apply(document, arguments);
}
// Bling-Bling method
// Returns array of nodes found by QSA
$$ = function(selector) {
return document.querySelectorAll.apply(document, arguments);
}
// Broke method
// returns the currently selected element within the console HTML pane
$0 = function toString() { [native code] }
The $1 - $4 methods are returning undefined, oddly enough.
It's not clear to me what the last few methods do. Maybe they're placeholders for feature methods but they continue to be undefined for now.
![5 More HTML5 APIs You Didn’t Know Existed]()
The HTML5 revolution has provided us some awesome JavaScript and HTML APIs. Some are APIs we knew we've needed for years, others are cutting edge mobile and desktop helpers. Regardless of API strength or purpose, anything to help us better do our job is a...
![Create a CSS Flipping Animation]()
CSS animations are a lot of fun; the beauty of them is that through many simple properties, you can create anything from an elegant fade in to a WTF-Pixar-would-be-proud effect. One CSS effect somewhere in between is the CSS flip effect, whereby there's...
![Chris Coyier’s Favorite CodePen Demos II]()
Hey everyone! Before we get started, I just want to say it's damn hard to pick this few favorites on CodePen. Not because, as a co-founder of CodePen, I feel like a dad picking which kid he likes best (RUDE). But because there is just so...
![Fancy FAQs with jQuery Sliders]()
Frequently asked questions can be super boring, right? They don't have to be! I've already shown you how to create fancy FAQs with MooTools -- here's how to create the same effect using jQuery.
The HTML
Simply a series of H3s and DIVs wrapper...
$0 returns whatever you have selected in the Elements tab.
These all work in Firebug too, by the way.
Line #15 in the first code segment shows this.
$0 and $1 return the currently selected DOM element and the previously selected DOM element, respectively. I haven’t yet found a use for this while debugging, mainly because selecting elements in the inspector and debugging in the console seem (for me at least) to be disconnected tasks, but maybe there will be a reason some day? ^_^
Not sure about webkit’s inspector, but you can find the API for firebug’s CLI here: http://getfirebug.com/wiki/index.php/Command_Line_API
Perhaps if they plan to use it in the future, they have to reserve it now so that the dom-modifying frameworks don’t start using it :)
Didn’t know about this, the bling-bling method is cool though, haha.
Here you can find all Answers ;) (At the bottom)
http://developer.euro.apple.com/library/safari/documentation/AppleApplications/Conceptual/Safari_Developer_Guide/DebuggingYourWebsite/DebuggingYourWebsite.html
Now I get it, this is why Douglas Crockford says you shouldn’t use $ functions.