How Can I Check for a CSS Class\'s Existence Using jQuery?

Detecting CSS Class Presence with jQuery

When working with web elements, it can be essential to determine whether a specific CSS class is associated with them. jQuery provides a straightforward solution for this task.

The hasClass method allows you to check if an element has a specified CSS class as part of its class list. Its usage is very simple:

jQueryCollection.hasClass(className);

Alternatively, you can use the shorter syntax:

$(selector).hasClass(className);

The className parameter is a string representing the class you wish to find. The method returns a boolean indicating the existence of that class on the element.

It's essential to note that this method performs a literal match against the element's className attribute. If the className contains whitespace, it will be matched against the entire string. For example, consider an element with a class attribute of "foo bar":

$('span').hasClass('foo bar') // true
$('span').hasClass('bar foo') // false

Therefore, remember to maintain a consistent order when comparing CSS classes using hasClass.

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