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How to Achieve a Seamless Infinity Loop Image Slider Using JavaScript/jQuery?
How to Achieve a Seamless Infinity Loop Image Slider Using JavaScript/jQuery?
Nov 01, 2024 pm 04:45 PM
Infinity Loop Slider Design Concepts Using JavaScript/jQuery
To create an infinity loop image slider with optimal code readability, maintainability, and reusability, consider the following blueprint:
Image Arrangement for Infinity Loop Effect
To achieve the illusion of an infinite loop, implement one of two approaches:
- Change z-Index: Adjust the z-index of each image as the next or previous image becomes visible.
- Modify DOM Position: Move the image within the DOM to create the appearance of scrolling or looping.
Cloning Images for Seamless Looping
To create an infinite loop, clone the first and last images in the sequence. Then, while scrolling:
- When transitioning from image n to image 1, move the container to the real first image's offset immediately after the animation completes.
- When transitioning from image 1 to image n, move the container to the real nth image's offset immediately after the animation completes.
Example Code
Consider the following JavaScript/jQuery code snippet as an example implementation:
$(function() {
var gallery = $('#gallery ul'),
items = gallery.find('li'),
len = items.length,
current = 1, /* the item we're currently looking */
first = items.filter(':first'),
last = items.filter(':last'),
triggers = $('button');
/* 1. Cloning first and last item */
first.before(last.clone(true));
last.after(first.clone(true));
/* 2. Set button handlers */
triggers.on('click', function() {
var cycle, delta;
if (gallery.is(':not(:animated)')) {
cycle = false;
delta = (this.id === "prev")? -1 : 1;
/* in the example buttons have id "prev" or "next" */
gallery.animate({ left: "+=" + (-100 * delta) }, function() {
current += delta;
/**
* we're cycling the slider when the the value of "current"
* variable (after increment/decrement) is 0 or when it exceeds
* the initial gallery length
*/
cycle = (current === 0 || current > len);
if (cycle) {
/* we switched from image 1 to 4-cloned or
from image 4 to 1-cloned */
current = (current === 0)? len : 1;
gallery.css({left: -100 * current });
}
});
}
});
});The above is the detailed content of How to Achieve a Seamless Infinity Loop Image Slider Using JavaScript/jQuery?. For more information, please follow other related articles on the PHP Chinese website!
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