Building a Simple jQuery Image Slider with Sliding and Opacity Effects

Creating a custom image slider in jQuery without relying on external plugins provides greater flexibility and control. Here's a simplified approach that offers both sliding and opacity transition effects.

jQuery Functions for Traversing and Manipulation

Before diving into the code, understanding two key jQuery functions is essential:

• index() returns the position of an element within its sibling elements.
• eq() selects an element based on its position (index value).

Opacity Effect

In the opacity effect, images are positioned absolutely and overlapped using CSS. When a trigger element is clicked, the corresponding image fades in while others fade out, relying on jQuery's fadeIn() and fadeOut() functions.

Sliding Effect

For the sliding effect, we use a double wrapper and mask technique. The images are placed inside a masked area, and a specific image is revealed by sliding the mask over it, giving the illusion of a sliding transition.

Common jQuery Response

Both the opacity and sliding effects share a common jQuery response that handles triggers (navigation elements), next/previous click events, and automatic timing transitions.

HTML Structure

<ul class="images">
    <li>
        <img src="images/1.jpg" alt="1" />
    </li>
    <li>
        <img src="images/2.jpg" alt="2" />
    </li>
    ...
</ul>

<ul class="triggers">
    <li>1</li>
    <li>2</li>
    ...
</ul>
<span class="control prev">Prev</span>
<span class="control next">Next</span>

Opacity Effect Code

ul.images { position:relative; }
ul.images li { position:absolute; }

var target;
var triggers = $('ul.triggers li');
var images = $('ul.images li');
var lastElem = triggers.length-1;

triggers.first().addClass('active');
images.hide().first().show();

function sliderResponse(target) {
    images.fadeOut(300).eq(target).fadeIn(300);
    triggers.removeClass('active').eq(target).addClass('active');
}

Sliding Effect Code

.mask { float:left; margin:40px; width:270px; height:266px; overflow:hidden;  }
ul.images { position:relative; top:0px;left:0px; }
/* this width must be total of the images, it comes from jquery */
    ul.images li { float:left; }

var target;
var triggers = $('ul.triggers li');
var images = $('ul.images li');
var lastElem = triggers.length-1;
var mask = $('.mask ul.images');
var imgWidth = images.width();

triggers.first().addClass('active');
mask.css('width', imgWidth*(lastElem+1) +'px');

function sliderResponse(target) {
    mask.stop(true,false).animate({'left':'-'+ imgWidth*target +'px'},300);
    triggers.removeClass('active').eq(target).addClass('active');
}

Common jQuery Response

triggers.click(function() {
    if ( !$(this).hasClass('active') ) {
        target = $(this).index();
        sliderResponse(target);
        resetTiming();
    }
});

$('.next').click(function() {
    target = $('ul.triggers li.active').index();
    target === lastElem ? target = 0 : target = target+1;
    sliderResponse(target);
    resetTiming();
});
$('.prev').click(function() {
    target = $('ul.triggers li.active').index();
    lastElem = triggers.length-1;
    target === 0 ? target = lastElem : target = target-1;
    sliderResponse(target);
    resetTiming();
});

function sliderTiming() {
    target = $('ul.triggers li.active').index();
    target === lastElem ? target = 0 : target = target+1;
    sliderResponse(target);
}

var timingRun = setInterval(function() { sliderTiming(); },5000);
function resetTiming() {
    clearInterval(timingRun);
    timingRun = setInterval(function() { sliderTiming(); },5000);
}

This codebase provides a fully functional jQuery image slider with sliding and opacity transition effects, customizable through CSS and various jQuery functions.

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