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Submitted by 1bennettc
almost 9 years

What is the difference between classes that start with a period and classes that don't?

How do I differentiate the two? Thanks.

Answer 558cfbc576b8fe219600038f

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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 $(‘.article’).removeClass(‘.current’) $(this).addClass(‘.current’) into $(‘.article’).removeClass(‘current’) $(this).addClass(‘current’)

The confusion when to use a pre-pending dot or NOT… In the Cascading Style Sheet syntax, you have to prepend-a-dot to 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 .current, In this .current 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 $(“.current”) 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 “current”

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/

what is CSS explained site:developer.mozilla.org https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Getting_started/What_is_CSS

Some reference-material: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference https://developer.mozilla.org/en-US/docs/Web/CSS/Specificity

https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes

www.crockford.com

http://stackoverflow.com/questions/1795438/load-and-execution-sequence-of-a-web-page

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Submitted by Leon
almost 9 years