What does the '#' sign mean in JavaScript?

Question

I\'m new to Javascript and I\'m try to understand some code. I don\'t understand and I can\'t find any documentation about the # sign.

$(function ()         


        

Answer 1

That isn't vanilla Javascript! That's jQuery!

In jQuery you can select elements via CSS style selectors. In this case, #x is a CSS selector to select all elements with the id x.

Answer 2

In JavaScript? Nothing special. It is just part of a string.

The $ function might do something with it, but it is hard to tell what the $ function is.

There are a lot of libraries which provide a $ function that acts as a kitchen sink for that library. They include Prototype, Mootools and jQuery. This one looks most like jQuery, in which case the argument is a string containing a CSS selector, so the # indicates the start of an id selector.

This "Selects a single element with the given id attribute".

Answer 3

That's just a string. The # is just part of a string. I'm assuming the $ is jQuery.

That means, that the string is a jQuery selector (or rather a CSS selector). The # means "ID". It's searching the DOM for the element with the ID `searchTerm.

Answer 4

Now # would/could mean private instance fields: https://tc39.github.io/proposal-class-fields/

Answer 5

That's the id selector for elements in HTML (in the DOM to be specific).

Answer 6

It's an element ID e.g: `...

When u need to access this div with JS or jQuery just call it $("#xyz").do something

for class <div class="abc">....</div> >> $(".abc")