In vue: usage of class

The :class attribute in Vue is used to dynamically set the CSS class of an element. It can add or remove classes, bound class arrays, or objects based on conditions. It accepts an object, array, or string containing a CSS class name as a value, can only be applied to elements with a class attribute, and does not override existing classes.

Usage of class in Vue

:class attribute

:class is a property in Vue that allows dynamically setting the CSS class of an element. It accepts an object, array, or string containing the CSS class name as a value.

Syntax

<code>:class="['class1', 'class2', { 'class3': true }]"</code>

Usage

: The class attribute is mainly used to dynamically add or remove CSS classes based on data. It can implement the following functions:

• Add or remove classes based on conditions: :class="{ 'active': isVisible }"
• Based on data values Add class: :class="['class-' propValue]"
• Bind class array: :class="classArray"
• Binding class object: :class="{ 'class1': true, 'class2': false }"

Example

<div :class="{ 'active': isVisible, 'error': hasError }"></div>

The above example will dynamically add or remove the active and error classes based on the values ​​of isVisible and hasError.

<div :class="classArray"></div>

The above example will bind an array of classes containing the class names to be added to the element.

Note

• : The class attribute can only be applied to elements with the class attribute.
• :The class attribute does not overwrite the element's existing class, but adds it to the existing class.
• If the value is a Boolean value, the corresponding value will be set in the class object with the class name as the key.

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