How to Use jQuery to Add and Remove CSS Classes on Click?-CSS Tutorial-php.cn

How to Use jQuery to Add and Remove CSS Classes on Click?

Linda Hamilton

Release： 2024-11-26 03:47:11

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How to Use jQuery to Add and Remove CSS Classes on Click?

How to Add and Remove Classes on Click Using jQuery?

In jQuery, you can dynamically manipulate CSS classes on elements with the addClass(), removeClass(), and toggleClass() methods. This can be useful for implementing dynamic behavior, such as adding or removing active states or highlighting menu items.

Example: Adding and Removing a Class on Click

Suppose you have a menu with

elements. You want to add a "current" class to the clicked element while removing it from all other elements. This ensures that only one element has the "current" class at a time.

Here's a jQuery solution:

$('#menu li').on('click', function() {
    $(this).addClass('current').siblings().removeClass('current');
});

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This code uses event delegation to attach a click handler to all

elements within the container with ID "menu." When an element is clicked, it adds the "current" class to itself and removes the same class from all its siblings using the siblings() method.

Additional Consideration: Initializing the "current" Class

Initially, you'll want to set the "current" class on one of the menu items. You can do this using:

$('#about-link').addClass('current');

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This adds the "current" class to the element with the ID "about-link," ensuring it starts off as the active item.

Improved Solution

Here's an improved solution that simplifies the code:

$('#menu li a').on('click', function(){
    $('#menu li a.current').removeClass('current');
    $(this).addClass('current');
});

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This works similarly to the previous code but targets the elements within

items. By default,

elements do not have href attributes, so the click event is not triggered on them directly.

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