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Background Image Carousel

Author: Dynamic Drive

Description: Background Carousel script is an image carousel that displays its images as background images. The advantage of this is the ability to easily modify the way each image is presented per CSS's background attribute. Use CSS's background-position property to easily center each image inside the container, or CSS3's background-size property to intelligently scale the image so it fits the container perfectly (using the values "contain" or "cover"), for example.

Here's a list of the script's main features:

  • Displays images one at a time with no breaks between the first and last slide (and visa versa).
  • Displays each image as a background image, affording you all the display options possible using CSS's background property.
  • The reel can display the slides horizontally (left to right), or vertically (top down).
  • Carousel can be set to automatically rotate the images and optionally stopping after x cycles.
  • Persistence of last viewed slide supported, so when the user reloads the page, the carousel resumes from the last slide.
  • Carousel automatically pauses onMouseover.

Demo:


Directions Developer's View

Step 1: Add the following SCRIPT to the <head> section of your page:

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The code references the following files, which you should download below:

Step 2: Add a blank DIV with a unique ID and CSS class defined where you wish the carousel to appear. The script will populate this DIV with the carousel.

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That's it for installation! Lets look at the available customization options for each instance of Background Image Carousel on your page.

Initialization of the script

To initialize the script to display an instance of Background Image Carousel, call new bgcarousel() in the HEAD section of your page:

var uniquevariable=new bgcarousel(options)

Where "uniquevariable" should be an arbitrary but unique variable (for each instance of Background Carousel), and options is an object literal containing the desired settings. For example:

var firstbgcarousel=new bgCarousel({
 wrapperid: 'mybgcarousel', //ID of blank DIV on page to house carousel
 imagearray: [
  ['autumnpark.jpg', '<h2>Autumn Day</h2>The sun peaks through the trees.'], // ["image_path", "optional description"]
  ['chime.jpg', '<h2>Wind Chime</h2>The bellweather of the sky, the chime speaks of impending turmoil.'],
  ['girlportrait.jpg', 'The scent of spring invigorates her as she inhales whilst the warm breeze brings a wave of tranquility.'],
  ['redbench.jpg', 'Alone and Lonliness- Peace and Inner Struggle'] //<--no trailing comma after very last image element!
 ],
 displaymode: {type:'auto', pause:3000, cycles:2, stoponclick:false, pauseonmouseover:true},
 navbuttons: ['left.gif', 'right.gif', 'up.gif', 'down.gif'], // path to nav images
 activeslideclass: 'selectedslide', // CSS class that gets added to currently shown DIV slide
 orientation: 'h', //Valid values: "h" or "v"
 persist: true, //remember last viewed slide and recall within same session?
 slideduration: 500 //transition duration (milliseconds)
})

Here's an explanation of each setting:

options Description
wrapperid

Required

The ID of an empty DIV container on your page that will show a Background Image Carousel. The corresponding DIV on the page should carry a matching unique ID and a specific CSS class:

<div id="mybgcarousel" class="bgcarousel"></div>

imagearray

Required

An array containing the images you wish to show. Each array element contains 2 parts:

["path_to_image", "optional textual description"]

displaymode

defaults to {type:'auto', pause:2000, stoponclick:false, cycles:2, pauseonmouseover:true}

Sets the primary attributes of your carousel, from whether this is an automatic or manual carousel, the pause between slides, the number of cycles before the carouselstops in automatic mode, to whether the carouselshould pause onMouseover:

{type:'auto', pause:3000, cycles:2, stoponclick:false, pauseonmouseover:true},

The "type" option should be set to either "auto" or "manual", for automatic or manual rotation, respectively.

The "cycles" option when set to 0 will cause the carousel to rotate perpetually in automatic mode, while any number larger than 0 means it will stop after x cycles.

The "pausemouseover" option when set to true will cause the slideshow to pause when the mouse rolls over it in automatic mode.

navbuttons

Required

An array pointing to the paths of the 4 images that make up the navigational buttons that get automatically added to the carousel, in that order:

['left.gif', 'right.gif', 'up.gif', 'down.gif'], // path to nav images

activeslideclass

Defaults to "selectedslide"

An arbitrary CSS class that gets added to the currently shown slide's DIV (in addition to the shared "slide" class). This class is removed when the slide is no longer the active one. It lets you apply additional styling via CSS to the currently shown slide.
orientation

Defaults to "h"

Set to either "h" or "v" to cause the carousel to scroll the slides from left to right (horizontally), or up down (vertically) instead.
persist

Defaults to true

Boolean variable that decides whether the slideshow should remember and recall the last viewed slide within a browser session when the page is reloaded.
slideduration

Defaults to 500

The duration of the sliding effect when transitioning from one image to the next, in milliseconds.

Additional customization via the CSS of the script

Some important aspects of the carousel must be specified via the CSS of the script. The "bgcarousel" and "slide" selectors contain properties you'll want to customize:

div.bgcarousel{ /* CSS for main carousel container */
background: black url(ajaxload.gif) center center no-repeat; /* loading gif while caoursel is loading */
width:700px; /* default dimensions of carousel */
height:500px;

}

div.slide{ /* CSS for each image's DIV container within main container */
background-color: black;
background-position: center center; /* center image within carousel */
background-repeat: no-repeat;
background-size: cover; /* CSS3 property to scale image within container? "cover" or "contain" */
color: black;
}

Pay special attention to the parts in bold, which control everything from the path of the loading gif, the dimensions of the carousel, to how the background image is positioned within the carousel.