'What does the "$" sign mean in jQuery or JavaScript? [duplicate]

Possible Duplicate:
What is the meaning of “$” sign in JavaScript

Why do we use the dollar ($) symbol in jQuery and JavaScript? I always put a dollar in my scripts but I actuary don't know why.

For an example:

$('#Text').click(function () {
  $('#Text').css('color', 'red')
});

This just changes the text colour when you click it, but it demonstrates my point.

javascript jquery

Solution 1:^[1]

In JavaScript it has no special significance (no more than a or Q anyway). It is just an uninformative variable name.

In jQuery the variable is assigned a copy of the jQuery function. This function is heavily overloaded and means half a dozen different things depending on what arguments it is passed. In this particular example you are passing it a string that contains a selector, so the function means "Create a jQuery object containing the element with the id Text".

Solution 2:^[2]

The $ is just a function. It is actually an alias for the function called jQuery, so your code can be written like this with the exact same results:

jQuery('#Text').click(function () {
  jQuery('#Text').css('color', 'red');
});

Solution 3:^[3]

In jQuery, the $ sign is just an alias to jQuery(), then an alias to a function.

This page reports:

Basic syntax is: $(selector).action()

A dollar sign to define jQuery

A (selector) to "query (or find)" HTML elements

A jQuery action() to be performed on the element(s)

Solution 4:^[4]

The jQuery syntax is tailor made for selecting HTML elements and perform some action on the element(s).

Basic syntax is: $(selector).action()

A dollar sign to define jQuery A (selector) to "query (or find)" HTML elements A jQuery action() to be performed on the element(s)

Solution 5:^[5]

The $ symbol simply invokes the jQuery library's selector functionality. So $("#Text") returns the jQuery object for the Text div which can then be modified.

Solution 6:^[6]

Additional to the jQuery thing treated in the other answers there is another meaning in JavaScript - as prefix for the RegExp properties representing matches, for example:

"test".match( /t(e)st/ );
alert( RegExp.$1 );

will alert "e"

But also here it's not "magic" but simply part of the properties name

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Quentin
Solution 2	dflemstr
Solution 3
Solution 4	Anuj Balan
Solution 5	Jeankowkow
Solution 6	Matmarbon

'What does the "$" sign mean in jQuery or JavaScript? [duplicate]

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