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.
![CSS vs. JS Animation: Which is Faster?]()
How is it possible that JavaScript-based animation has secretly always been as fast — or faster — than CSS transitions? And, how is it possible that Adobe and Google consistently release media-rich mobile sites that rival the performance of native apps?
This article serves as a point-by-point...
![Responsive Images: The Ultimate Guide]()
Chances are that any Web designers using our Ghostlab browser testing app, which allows seamless testing across all devices simultaneously, will have worked with responsive design in some shape or form. And as today's websites and devices become ever more varied, a plethora of responsive images...
![Introducing MooTools HeatMap]()
It's often interesting to think about where on a given element, whether it be the page, an image, or a static DIV, your users are clicking. With that curiosity in mind, I've created HeatMap: a MooTools class that allows you to detect, load, save, and...
![MooTools dwCheckboxes Plugin]()
Update / Fix: The checkboxes will no longer toggle when the "mouseup" event doesn't occur on a checkbox.
Every morning I wake up to a bunch of emails in my Gmail inbox that I delete without reading. I end up clicking so many damn checkboxes...
$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.