Fade out a background image using jQuery

I am currently working on customizing a jQuery slider similar to NivoSlider. I want to replace the default images with my own controls.

Here is what I have in HTML:

<div id="slider" class="nivoSlider">
   <img src="img/slider/start1.jpg"  alt="" />
   <img src="img/slider/start2.jpg"  alt=""/>
   <img src="img/slider/start3.jpg"  alt="" />
</div>

<!--controls-->

<ul class="lista">
   <li class="first"></li><!--thumbnail here on background image-->
   <li class="second"></li>
   <li class="third"></li>  
</ul>

By clicking on, for example, the second li element, I aim to change the main image in the slider and its corresponding thumbnail. The code snippet below shows how I've managed so far (I'm relatively new to JavaScript):

    $('.first').click(function(){
    $(this).css('background', 'url(img/slider/1min_a.jpg)');
    $('.second').css('background', 'url(img/slider/2min.jpg)');
    $('.third').css('background', 'url(img/slider/3min.jpg)');
    }); 

   $('.second').click(function(){
    $(this).css('background', 'url(img/slider/2min_a.jpg)');    
    $('.first').css('background', 'url(img/slider/1min.jpg)');
    $('.third').css('background', 'url(img/slider/3min.jpg)');
    });     

   $('.third').click(function(){
    $(this).css('background', 'url(img/slider/3min_a.jpg)');
    $('.first').css('background', 'url(img/slider/1min.jpg)');
    $('.second').css('background', 'url(img/slider/2min.jpg)');
    }); 

I have two questions:
1. How can I simplify this code?
2. How can I incorporate a fadeOut/fadeIn effect to prevent the "blink" when changing backgrounds?

Answer №1

It's actually quite straightforward.

Step 1. Familiarize yourself with data attributes.

Step 2. Avoid coding in your usual manner. Opt for a dynamic slideshow instead.

In your HTML:

<div class="thumbnail" data-bigimg="image src of your main image">

Ensure to load all main image sources while looping by setting the data-bigimg attribute to the full path of the main image source for each thumbnail div.


$(document).on('click', '.thumbnail', function () {
    var img_src = $(this).attr('data-bigimg');
    $("#main_img").fadeOut(300,function(){
      $("#main_img").attr("src", img_src).fadeIn(500); // main_img is your main Slideshow image.
     });
});

Explanation:

  1. Upon clicking on a thumbnail, you retrieve its data attribute value.
  2. Next, assign this image source to the main slideshow image.

Revise your html:


<div class="nivoSlider">
   <img id="main_img" src="img/slider/start1.jpg" alt="" />
</div>

<!--controls-->

<ul class="lista">
   <li class="thumbnail" data-bigimg="src of main image to be displayed"></li> <!-- thumbnail here as background image -->
   <li class="thumbnail" data-bigimg="src of main image to be displayed"></li>
   <li class="thumbnail" data-bigimg="src of main imageto be displayed "></li>  
</ul>

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