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.
![Write Better JavaScript with Promises]()
You've probably heard the talk around the water cooler about how promises are the future. All of the cool kids are using them, but you don't see what makes them so special. Can't you just use a callback? What's the big deal? In this article, we'll...
![Conquering Impostor Syndrome]()
Two years ago I documented my struggles with Imposter Syndrome and the response was immense. I received messages of support and commiseration from new web developers, veteran engineers, and even persons of all experience levels in other professions. I've even caught myself reading the post...
![Save Text Size Preference Using MooTools 1.2]()
Last time posting here I taught you how to change text-size with JavaScript. The problem with using the solution I presented as Ian Lloyd pointed out:
Increase the font size, follow a link to another web page on same site and … back...
![Fade Images with MooTools LazyLoad]()
I recently received an email from a MooTools developer asking a great question about my LazyLoad class:
"I'm using your LazyLoad MooTools plugin (which is great, by the way). I have been trying to figure out how to modify it so that once an image scrolls into...
$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.