Question

For example, if I were to use this code:

$(".Class").children(:last).click(function(){
    $(this).siblings(":not(:last)").toggle();
}

Would “this” refer to the “.Class” class, or would it refer to the last child of the specified “.Class” class?

Answer 1

this would refer to the DOM element that results matched in the final selector in the chain that triggers the event; in this case, the :last child of .Class. So, the event would trigger if you click the last child of the last .Class class. See in this fiddle how only foo2 triggers the alert.

<div class="Class">
    <div> </div>
    <div> </div>
    <div> </div>
   <div> </div> <!--This is the last child of .Class-->

</div>

Except, it won’t work as you’ve posted it, since :last should be in quotes as a string.