Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trialLeandro Severino
12,674 PointsWhat does "$()" mean?
I was checking the docs of one library and it has codes like...
$().w2grid(config.grid2); URL: http://w2ui.com/web/demos/#!combo/combo-1
I want to know what the $() does.
Steven Parker
229,644 PointsIt is not a shorthand for "$(document).ready()
" unless it is given a callback function as an argument ("$(callback)
").
2 Answers
Steven Parker
229,644 Points"$()" is a shorthand for "jquery()".
Here's an excerpt from the jQuery API manual:
jQuery()
— which can also be written as$()
— searches through the DOM for any elements that match the provided selector and creates a new jQuery object that references these elements: If no elements match the provided selector, the new jQuery object is "empty"; that is, it contains no elements and has .length property of 0
In this case, the empty jQuery object is being used to access the w2grid method of the w2ui jQuery plug-in.
Leandro Severino
12,674 PointsThanks! I'm just confused coz I don't know the reason(yet) for using "$()" which just returns an empty set.
Unsubscribed User
3,074 PointsUnsubscribed User
3,074 PointsThat is most likely jQuery shorthand for $(document).ready();
So the script will only execute once the DOM has been fully loaded/finished loading