welcome to StackOverflow.
You should take more precautions when writing your question, and make sure that it is written in good English, and in a way so that someone who does not priorly know what you want to achieve can understand your goal when reading the question.
I’m gonna try to answer to the parts I think I understand.
if the div has that class it then X function (in this case it’s fadeout) happens
What I understand is that you would like to trigger the execution of function X when the
<div> receives a class (
thus clicking on it makes X function happen.
Maybe your goal is actually simpler. If you only want to trigger the execution of a function when you click on the
<div>, then you’ll have to look at mouse event handlers, especially
.click() that allows to