4. Next slide 1 - Why do we not add the full stop for removeClass and addClass)


#1



Why do we not add the full stop for removeClass and addClass), where the fade in & out is on the last couple of paragraphs in the parentheses?


var main = function() {
    $('.dropdown-toggle').click(function() {
        $('.dropdown-menu').toggle();    
    });
    
    $('.arrow-next').click(function() {
        var currentSlide = $('.active-slide');
        var nextSlide = currentSlide.next();
        
        currentSlide.fadeOut(600).removeClass('active-slide')
        nextSlide.fadeIn(600).addClass('active-slide');
    });
};

$(document).ready(main);


#2

@tomistrouble

+++++ addClass removeClass

Every HTML-Element has so called attributes.
One of the possible attributes, is the class-attribute.

If you write the HTML-document, you add the class-attribute
within the Element-Tag by using the syntax
class-keyword = then a string
containing the class-name
OR mutliple class-names which are =separated=from=eachother= by a space

Thus with

 <div class="myClass1 myClass2 myClass3" ></div>

you now have a DIV-Element carrying 3 classes myClass1, myClass2 and myClass3

As part of its CSS-category-of-Methods jQuery gives you the ability
to manipulate this class-attribute
by providing the addClass()-, removeClass()-, toggleClass()-Methods.
You will have to provide the Method at least 1 argument
which is the string VALUE of the class-name.
Thus you have to change
currentSlide.fadeOut(600).removeClass('.active-slide')
into
currentSlide.fadeOut(600).removeClass('active-slide')

The confusion when to use a pre-pending dot or NOT...
In the Cascading Style Sheet syntax,
you have to prepend-a-dot to the classname
so the CSS will interpret it as a class-attribute
So in the file style.css you will find an object
identified by .active-slide,
In this .active-slide object
the background property-key is set to a particular VALUE

jQuery uses the same syntax to identify a class-attribute
like in the jQuery-selector
$('.active-slide') by which this HTML-Element and all it's CHILDREN
are selected into a jQuery-object,

This parent-HTML-Element carries the class-attribute with class-name 'active-slide'

Reference::

google search
class site:jquery.com
https://api.jquery.com/category/selectors/
http://api.jquery.com/class-selector/
https://api.jquery.com/element-selector/
http://www.w3schools.com/jquery/trysel.asp <<== play around