How to Animate Box-Shadow with jQuery: Direct or CSS Animation?

How to Properly Animate Box-Shadow with jQuery

Understanding the Issue

The box-shadow property, which adds visual depth to elements, can be challenging to animate with jQuery. The standard approach involves modifying the individual facets of the shadow (such as color, offset, blur radius, and spread radius) separately. However, this can be complex and error-prone.

Direct Solution

A convenient solution is to utilize Edwin Martin's jQuery plugin for shadow animation. It seamlessly extends the animate method, allowing you to specify "boxShadow" as the animated property. Every aspect of the shadow, including color, offsets, and radii, will be animated accordingly.

<code class="js">$(element).animate({ 
    boxShadow: "0px 0px 5px 3px hsla(100, 70%, 60%, 0.8)"
});</code>

Alternative Approach: CSS Animations

Alternatively, consider using CSS animations to control the box-shadow effect. This approach keeps style information within your stylesheets and avoids potential specificity issues.

<code class="css">@keyframes shadowPulse {
    0% {
        box-shadow: 0px 0px 10px 0px hsla(0, 0%, 0%, 1);
    }

    100% {
        box-shadow: 0px 0px 5px 0px hsla(0, 0%, 0%, 0);
    }
}

.shadow-pulse {
    animation-name: shadowPulse;
    animation-duration: 1.5s;
    animation-iteration-count: 1;
    animation-timing-function: linear;
}</code>

Once the CSS animation is defined, you can apply it using JavaScript or jQuery. When the animation finishes, the animationend event can be used to trigger subsequent actions.

element.classList.add('shadow-pulse');
element.addEventListener('animationend', event => {  
    element.classList.remove('shadow-pulse');
    // do something else...
});

$(element).addClass('shadow-pulse');
$(element).on('animationend', function(){    
    $(element).removeClass('shadow-pulse');
    // do something else...
});

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