Can You Monitor Style Changes in JavaScript?

Can You Monitor Style Changes with an Event Listener?

In the realm of front-end development, being able to respond to style changes dynamically can be invaluable. In the past, there has been a desire to create a jQuery event listener that tracks any style changes. However, this feature has not been natively available.

Instead, a workaround was developed. By overriding jQuery's internal CSS method, a trigger could be added at the end of the method to fire an event whenever a style change occurred:

(function() {
    var ev = new $.Event('style'),
        orig = $.fn.css;
    $.fn.css = function() {
        $(this).trigger(ev);
        return orig.apply(this, arguments);
    }
})();

This solution provided a way to bind event listeners to style changes:

$('p').bind('style', function(e) {
    console.log( $(this).attr('style') );
});

$('p').width(100);
$('p').css('color','red');

Modern Techniques with MutationObservers

Since then, technology has progressed, and MutationObservers provide a more modern and standard-compliant approach to detect changes in the 'style' attribute. No jQuery is required now:

var observer = new MutationObserver(function(mutations) {
    mutations.forEach(function(mutationRecord) {
        console.log('style changed!');
    });    
});

var target = document.getElementById('myId');
observer.observe(target, { attributes : true, attributeFilter : ['style'] });

This approach is supported in most modern browsers, including Internet Explorer 11 . By utilizing a MutationObserver, you can monitor style changes effectively and respond appropriately in your applications.

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