How to determine whether an element has a class in jquery

Jquery method to determine whether an element has a class: 1. Determine whether an element has a certain class through the "hasClass('classname')" method; 2. Determine whether an element has a certain class through the "is('.classname')" method Whether it has a certain class.

The operating environment of this tutorial: Windows 10 system, jquery3.6 version, Dell G3 computer.

How does jquery determine whether an element has a class?

jquery determines whether an element has a certain class

Two methods are as follows:

1, hasClass('classname')

2, is('.classname')

Example:

1. Use is('.classname') method

$('div').is('.redColor')

2. Use hasClass('classname') Method (note that the lower version of jquery may be hasClass('.classname'))

$('div').hasClass('redColor')

Extended information:

About the hasclass( of jquery that appears above) ) and is() Introduction

1, is()

is(expr|obj|ele|fn)

Detects a set of matching elements based on a selector, DOM element or jQuery object, if at least one element matches the given The expression returns true.

If no element matches, or the expression is invalid, 'false' is returned. '''Note:''''Support for all expressions is only available in jQuery 1.3. In previous versions, if complex expressions, such as hierarchical selectors (for example, ~ and > ), were provided, they would always return true

2. hasclass()

checks the current Whether the element contains a specific class, if so, returns true.

This is actually is("." class).

Description: Perform an animation on an element containing a certain class.

Recommended learning: jQuery video tutorial

The above is the detailed content of How to determine whether an element has a class in jquery. For more information, please follow other related articles on the PHP Chinese website!