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JavaScript jQuery Basics (2014) Creating a Mobile Drop Down Menu Perform: Part 1

gaby ibarlucea
gaby ibarlucea
4,213 Points

What is the purpose of var $anchor = $(this); ? and what exactly is the keyword 'this'?

Thank you for your help in advance!

3 Answers

Aleksandr Antonov
Aleksandr Antonov
15,876 Points

it depends on the context (No code to reference) in most cases $(this) references the instance of a target being selected.

Say I have an unordered list with few list items

<ul>
    <li></li>
    <li></li>
     <li></li>
</ul>

Then if I Iterate over them

    $('ul li').each(function(){
           let item = $(this);
    });

In this scenario $(this) references the specific li that is curently being iterated over.

Hope this some what helps

So, is the code used in the example above valid for a "for loop"?

Like so:

          var $listItems = $('ul li');
          for (var i = 0; i < $listItems.length; i += 1) {
                var item = listItems[i];
               // and so on.....
          }

Steven Parker , as many times before - looking forward to your expertise!

Steven Parker
Steven Parker
229,582 Points

:bell: I got notified by your tag. But I'm not sure what you're asking here. Aleksandr's example isn't a "for loop", but a jQuery function that iterates through an array (sort of a "loop substitute"). He seems to be using it as an example of appyling "$(this)".

But your exampe is a for loop, but it doesn't illustrate using "$(this)", which seems to be the topic Gaby's original question.

Steven Parker , I'm simply asking can I use a "for loop" instead of ".each()" method on $('ul li').

Steven Parker
Steven Parker
229,582 Points

For general practice, you certainly can. But when you get to the code challenge, it will want you to specifically create a solution using the jQuery "each" function.