Customizing fullpage.js to skip section(s) dynamically - toggle

Question

The question is simple but i'm not able to make a script by myself for what i need...
I am actually using a script ( fullpage.js ) who toggle some classes into a container ( in my case switching from fp-viewing-1 to fp-viewing-x ) when you scroll down/up between sections.
I need to make a script that listen from this container and toggle a new class into a div ONLY when a class ( in my case fp-viewing-3 ) is added to this container ( from the fullpage.js script of course ).
Any way to make it?

Answer 1

I need to make a script that listen from this container
That's not the way to go for it.
If you want to use the status class, then just create a new class based on the previous ones as explained in this fullpage.js tutorial.
Create a conditional CSS class that will only get applied when its parent class matches your requirement.
Something like this, for example, would only apply the red color to element with myClass when you are in section 1 slide 0.
.fp-viewing-1-0 .myClass{
color: red;
}
Having:
<div id="fullpage">
<div class="section"></div>
<div class="section myClass"></div>
<div class="section"></div>
<div>
If for some other reason (use of plugins etc) you really need to add the class dynamically, then go for fullpage.js callbacks onLeave or afterLoad:
$('#fullpage').fullpage({
onLeave: function(index, nextIndex, direction){
var destination = $('.section').eq(nextIndex - 1);
destination.find('.my-element').addClass('myClass');
}
});

Answer 2

This is the solution to my problem.
Fullpage works as intended except for section 2.
Section 2 will be usable only scrolling down, the script ignore it when scrolling up.
$(document).ready(function() {
$('#application').fullpage({
onLeave: function(index, nextIndex, direction){
var destinationToIgnore = $('.fp-section').hasClass('ignore');
if(destinationToIgnore && direction =='up'){
var destination = nextIndex = 1
$.fn.fullpage.moveTo(destination);
}
},
afterLoad: function(anchorLink, index){
var loadedSection = $(this);
if(index !== 1){
$('.section-intro').removeClass('ignore');
}
if(index == 3){
$('.section-intro').addClass('ignore');
}
}
});
});