Question

94

$ Variable (Dollar Sign) in Chrome?

rated 0 times [ 97] [ 3] / answers: 1 / hits: 15606 / 12 Years ago, thu, august 2, 2012, 12:00:00

I was working with the developer tools of google chrome on a page without jQuery (or any other library that uses the $ sign as a shortcut).
When I inspected $ by the console (by just typing it in and hitting enter), i got this:

$

function () { [native code] }

So, chrome has some native function that can be referenced by $. Only chrome seems to have this one and i cannot access it via window['$'] nor via document['$'] or this['$'].

I was not able to find out what this function is. Do you know what it does and maybe have some background information on this?
Thanks in advance!

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davion

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3 Years ago

answered 12 Years ago hallie · Accepted Answer

This has changed yet again, even since just last year.

The devtools console provides $ as an alias to document.querySelector, along with many other things; here's an excerpted list:

$(selector) returns the reference to the first DOM element with the specified CSS selector. This function is an alias for the document.querySelector() function.

$$(selector) returns an array of elements that match the given CSS selector. This command is equivalent to calling document.querySelectorAll().

$_ returns the value of the most recently evaluated expression.

The $0, $1, $2, $3 and $4 commands work as a historical reference to the last five DOM elements inspected within the Elements panel or the last five JavaScript heap objects selected in the Profiles panel.

...and a bunch of others.

Note how it calls $ an alias of document.querySelector, but says $$ is "equivalent" to calling document.querySelectorAll. Neither seems to be literally true; $ === document.querySelector is false, and $$ returns an array, not a NodeList.