Created
April 16, 2019 12:10
-
-
Save artursopelnik/68ea9b2db12c53399e0cbafe5d4263c7 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* Parallax | |
* | |
* Translate3d | |
* | |
* 1.0 | Muffin Group | |
*/ | |
var mfnSetup = { | |
translate: null | |
}; | |
(function( $ ){ | |
"use strict"; | |
/* ------------------------------------------------------------------------ | |
* | |
* mfnSetup | |
* | |
* --------------------------------------------------------------------- */ | |
// has3d ------------------------------------------------ | |
var has3d = function(){ | |
if ( ! window.getComputedStyle ) { | |
return false; | |
} | |
var el = document.createElement('div'), | |
has3d, | |
transforms = { | |
'webkitTransform':'-webkit-transform', | |
'OTransform':'-o-transform', | |
'msTransform':'-ms-transform', | |
'MozTransform':'-moz-transform', | |
'transform':'transform' | |
}; | |
document.body.insertBefore(el, null); | |
for (var t in transforms) { | |
if (el.style[t] !== undefined) { | |
el.style[t] = "translate3d(1px,1px,1px)"; | |
has3d = window.getComputedStyle(el).getPropertyValue(transforms[t]); | |
} | |
} | |
document.body.removeChild(el); | |
return( has3d !== undefined && has3d !== null && has3d.length > 0 && has3d !== "none" ); | |
}; | |
// browserPrefix ------------------------------------------------ | |
var browserPrefix = function(){ | |
var el = document.createElement('div'), | |
vendor = ["ms", "O", "Webkit", "Moz"], | |
i, prefix; | |
for (i in vendor) { | |
if (el.style[vendor[i] + "Transition"] !== undefined) { | |
prefix = vendor[i]; | |
break; | |
} | |
} | |
return prefix; | |
}; | |
// __construct ------------------------------------------------ | |
var __construct = function(){ | |
if( has3d() ){ | |
mfnSetup.translate = function( el, x, y ){ | |
el.css( '-' + browserPrefix() + '-transform', 'translate3d(' + x + ', ' + y + ', 0)' ); | |
}; | |
} else { | |
mfnSetup.translate = function( el, x, y ){ | |
el.css({ "left": x, "top": y }); | |
}; | |
} | |
}; | |
__construct(); | |
})(jQuery); | |
(function( $ ){ | |
"use strict"; | |
/* ------------------------------------------------------------------------ | |
* | |
* $.fn.mfnParallax | |
* | |
* --------------------------------------------------------------------- */ | |
$.fn.mfnParallax = function(){ | |
var el = $(this), | |
parent = el.parent(), | |
speed = 500, | |
element, parentPos, windowH; | |
// imageSize ------------------------------------------------ | |
var imageSize = function( img ){ | |
var w, h, l, t; // width, height, left, top | |
var imageW = img.get(0).naturalWidth; | |
var imageH = img.get(0).naturalHeight; | |
var parentW = img.parent().outerWidth(); | |
var parentH = img.parent().outerHeight(); | |
var windowH = $(window).height(); | |
// fix for small sections | |
if( windowH > parentH ){ | |
parentH = windowH; | |
} | |
var diff = imageW / parentW; | |
if( ( imageH / diff ) < parentH ){ | |
w = imageW / ( imageH / parentH ); | |
h = parentH; | |
if( w > imageW ){ | |
w = imageW; | |
h = imageH; | |
} | |
} else { | |
w = parentW; | |
h = imageH / diff; | |
} | |
l = ( parentW - w ) / 2; | |
t = ( parentH - h ) / 2; | |
return [w, h, l, t]; | |
}; | |
// parallax ------------------------------------------------ | |
var parallax = function(){ | |
var scrollTop = $(window).scrollTop(), | |
scrollDiff, ratio, translateTop; | |
if( parentPos !== undefined ){ | |
if( scrollTop >= parentPos.min && scrollTop <= parentPos.max ) { | |
scrollDiff = scrollTop - parentPos.min; | |
ratio = scrollDiff / parentPos.height; | |
translateTop = windowH + ( ratio * speed ) - scrollDiff - ( speed * ( windowH / parentPos.height ) ) ; | |
mfnSetup.translate( el, element.left + "px", -Math.round( translateTop ) + "px" ); | |
} | |
} | |
}; | |
// init ------------------------------------------------ | |
var init = function(){ | |
windowH = $(window).height(); | |
var initElement = function(){ | |
var size = imageSize( el ); | |
el.removeAttr( 'style' ).css({ | |
'width' : size[0], | |
'height' : size[1] | |
}); | |
mfnSetup.translate(el, size[2] + "px", size[3] + "px"); | |
return { | |
'width' : size[0], | |
'height' : size[1], | |
'left' : size[2], | |
'top' : size[3] | |
}; | |
}; | |
element = initElement(); | |
var initParent = function(){ | |
var min = parent.offset().top - $(window).height(); | |
var max = parent.offset().top + $(parent).outerHeight(); | |
return { | |
'min' : min, | |
'max' : max, | |
'height' : max - min | |
}; | |
}; | |
parentPos = initParent(); | |
}; | |
// reload ------------------------------------------------ | |
var reload = function(){ | |
setTimeout( function(){ | |
init(); | |
parallax(); | |
}, 50); | |
}; | |
// .bind() ------------------------------------------------ | |
$(window).bind( 'load resize', reload ); | |
$(window).bind( 'scroll', parallax ); | |
}; | |
/* ------------------------------------------------------------------------ | |
* | |
* $(document).ready | |
* | |
* --------------------------------------------------------------------- */ | |
$( document ).ready( function(){ | |
if( $(".mfn-parallax").length ) { | |
$(".mfn-parallax").each( function(){ | |
$(this).mfnParallax(); | |
}); | |
} | |
}); | |
})(jQuery); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment