Identify a CSS style or attribute that is being dynamically assigned using JavaScript

While using the Jquery Cycle plugin for my slideshow, I'm looking to trigger an event when a specific slide is active. The Cycle plugin handles this by adjusting the opacity of images within a div in this manner:

<div style="position: absolute; top: 0px; z-index: 9; display: none; opacity: 0;">

When a particular image becomes active or serves as the current slide, its opacity changes to 1 and display switches to "block".

I have experimented with various methods such as detecting the CSS style/attribute of the div or assigning a class to the div in question before executing an action:

if($("#slideshow > div:nth-child(2)").hasClass('fadeOut') == 1) {
    alert('Hello');
}

or

if($("#slideshow > div:nth-child(2)").css('opacity') == 1) {
    alert('Hello');
}

and also

if($(".fadeOut").css('opacity') == 1) {
    alert('Hello');
}

The issue lies in JavaScript failing to detect the "opacity: 1" style when it's dynamically applied through the Cycle plugin. Conversely, it functions correctly when the style is directly added inline in the CSS file. However, triggering the event upon page load isn't desirable; instead, the goal is for the event to activate exclusively when the second image is considered active - meaning either the "opacity" is set to 1 or "display" is set to block. Unfortunately, finding a solution has proven to be quite challenging.

javascriptcssdynamic

Answer №1

Your ability to accurately assess the current state of an element is crucial in solving this issue. It seems like the challenge lies in timing your evaluations correctly.

Simply put: Monitoring changes to style properties or class attributes is not a straightforward task. The most effective approach would involve listening for DOMModification events, albeit a less elegant solution.

Therefore, consider using a different plugin that specifically triggers [custom] events when there are changes to the elements, such as slideshow plugins designed for this purpose.

Answer №2

Do you think this solution could meet your needs?

HTML

<p></p>
<div class="carousel">
    <img id="1" src="http://example.com/img/1.jpg" />
    <img id="2" src="http://example.com/img/2.bmp" />
    <img id="3" src="http://example.com/img/3.png" />
</div>

CSS

.carousel { position:relative; }
.carousel img { position:absolute; left:0; top:0; }​

JavaScript

$(function(){
    $('.carousel img:gt(0)').hide();
    setInterval(function(){
        var currentSlide=$('.carousel :first-child');

        if ( currentSlide.attr('id') === '1' )
            $("p:last").html('Loading slide 2...');
        else
            $("p:last").html('');

        currentSlide.fadeOut(2000).next('img').fadeIn(2000).end().appendTo('.carousel');
    }, 4000);
});​

Demo link provided below

http://jsfiddle.net/examplelink

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