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Parallax using Translate3d

Use translate for parallax to utilize the user's hardware to make for smoother scrolling across browsers.
This also allows for transition effects and greater CSS styling abilities since it's not using a background image but instead using an img element.

Settings
Option Type Default Possible Values Description
image String /public/images/parallax.jpg Path to the image
centerElement Boolean true true/false Center the image if larger than window
boundaries Boolean true true/false Give the parallax container boundaries
stayInBoundaries Boolean true true/false Stay in the boundaries of the parallax container
scrollSpeed Number 0 The amount the parallax scrolls (boundaries: false)
offset Number 0 The offset of the image when parallax is centered on screen (boundaries: false)
overflow String hidden hidden/visible Control the overflow on the parent element
direction Object
direction.move String y x/y/xy Direction to move the parallax element
direction.y String up up/down Move up or down
direction.x String ltr ltr/rtl Move left-to-right(ltr) or right-to-left(rtl
onLoad Function null Function to run when the plugin is setup but before it runs
beforeMove Function null Function to run before the image moves
afterMove Function null Function to run after the image moves
step Object
step.forward Function null Function to run on each movement of the parallax while scrolling down the page
step.backward Function null Function to run on each movement of the parallax while scrolling up the page
onResize Function null Function to run when window resizes
HTML

Give the parent element the parallax class and set the attribute data-parallax-image with the value of where the image is located.
You can also set the image inside the initialization call, but if there are multiple parallax sections on the same page, you'll want to use
the data-parallax-image method so you can have different images for each section.

You can also change how the parallax function using html data attributes.

HTML SETTINGS

Option JS Equivalent
data-parallax-image image
data-parallax-center-element centerElement
data-parallax-boundaries boundaries
data-parallax-stay-in-boundaries stayInBoundaries
data-parallax-scroll-speed scrollSpeed
data-parallax-offset offset
data-parallax-overflow overflow
data-parallax-direction-move direction.move
data-parallax-direction-y direction.y
data-parallax-direction-x direction.x
data-parallax-instance N/A; Give that instance of parallax a name for easier debugging
<section class="parallax one" data-parallax-image="/public/images/parallax/parallax1.jpg">
    <div class="container">
        <div class="row">
            <div class="col-xs-12">
                <!-- HTML CONTENT -->
            </div>
        </div>
    </div>
</section>
CSS

Grab the CSS from the "style.css" in the "css" folder
Adjust the padding on .parallax .row as necessary to give the best effect for your site

JavaScript

Initialize parallax

<script>
    $(document).ready(function () {
        $('.parallax').parallax();
    });
</script>
Complex Installation

For a more complex installation and to demonstrate the step functionality.
Use the step.forward and step.backward callbacks to change the image from black & white to colored when
the parallax has completed a certain percent.

<section id="parallax-complex" class="parallax two flyin" data-parallax-instance="image-swap">
    <img class="parallax-element" src="/public/images/parallax/parallax1.jpg" />
    <div class="parallax-wrap">
        <img class="parallax-element swap-image" src="/public/images/parallax/parallax1.jpg" />
    </div>
    <div class="container">
        <div class="row">
            <div class="col-xs-12" >
                <!-- Content -->
            </div>
        </div>
    </div>
</section>
.parallax .parallax-wrap {
    position: absolute;
    top: 0;
    overflow: hidden;
    width: 100%;
}
.parallax .parallax-element.swap-image {
    opacity: 0;
    transition: 1s opacity ease;
}
.parallax .parallax-element.swap-image.swapped {
    opacity: 1;
    transition: 1s opacity ease;
}

.parallax .parallax-element:not(.swap-image) {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
    filter: gray; /* IE6-9 */
    filter: grayscale(100%);
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -o-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
}
$('.parallax').parallax({
    step: {
        forward: function (e) {
            if (e.instance === 'image-swap') {
                if (e.percentComplete > 40 && !imageSwapped) {
                    imageSwapped = true;
                    $(e.el).find('.parallax-element').addClass('swapped');
                    $(e.el).find('.parallax-element.swap-image').width(e.geo.parallax.element.width).height(e.geo.parallax.element.height).parent('.parallax-wrap').animate({
                        height: e.geo.parallax.viewport.height + 'px'
                    }, {
                        duration: 2000
                    });
                }
            }
        },
        backward: function (e) {
            if (e.instance === 'image-swap') {
                if (e.percentComplete < 30 && imageSwapped) {
                    imageSwapped = false;
                    $(e.el).find('.parallax-element').removeClass('swapped');
                    $(e.el).find('.parallax-wrap').animate({
                        height: '0px'
                    }, {
                        duration: 2000
                    });
                }
            }
        }
    }
});