CODEWITHSUNDEEP
jquery
geoyws
geoyws

Reputation: 3697

What does jQuery(function($){something}); do?

I've never seen anyone do this before. Could anyone enlighten me on this? This was taken from here.

jQuery(function ($) { //What's with the $ as an argument?
    $('#flux').bind('scroll', function () {
        if ($(this).scrollTop() + $(this).innerHeight() >= $(this)[0].scrollHeight) {
            alert('end reached');
        }
    })
});

It appears he can declare a function and run it at the same time.

Upvotes: 2

Views: 58

Answers (2)

Thilo
Thilo

Reputation: 262860

It appears he can declare a function and run it at the same time.

The function is not run here, it is just passed to jQuery (which will run it when the document is ready).

function ($) { //What's with the $ as an argument?

This is the Javascript concept of a module:

Instead of having the function refer to a global $ (which may end up being something unexpected), you pass in the $ as a parameter (jQuery will do that for you here). Then within the function body $ refers to that local object.

I just tested the function without the $ argument and it works regardless.

Yes, but that is because you also have a global object $. The idea of passing it in explicitly is to avoid having the function access the global scope.

Upvotes: 0

Misiur
Misiur

Reputation: 5307

It's shorthand for http://api.jquery.com/ready/

The argument $ is in fact jQuery - it's often used to avoid conflicts with some other global $ variable

See: http://api.jquery.com/jQuery/#jQuery3

Upvotes: 2

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