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<link rel="import" href="//polygit.org/components/polymer/polymer.html" /> | |
<dom-module id="parallax-parent"> | |
<template> | |
<style> | |
:host { | |
position: relative; | |
overflow: hidden; | |
} | |
:host ::content [parallax-speed] { | |
position: relative; | |
} | |
</style> | |
<content></content> | |
</template> | |
</dom-module> | |
<script> | |
(function(dlwj){ | |
dlwj.ParallaxParentElement = Polymer({ | |
is: 'parallax-parent', | |
properties: {}, | |
ready: function() { | |
var parallaxParent = this; | |
var parallaxedElements = this.queryAllEffectiveChildren('[parallax-speed]'); | |
for (i = 0; i < parallaxedElements.length; i++) { | |
parallaxedElement = parallaxedElements[i]; | |
parallaxedElement.originalPosition = { | |
}; | |
} | |
window.addEventListener('scroll', function() { | |
var parallaxedElement, parallaxSpeed, i, parallaxParentTop; | |
parallaxParentTop = parallaxParent.getBoundingClientRect().top; | |
for (i = 0; i < parallaxedElements.length; i++) { | |
parallaxedElement = parallaxedElements[i]; | |
parallaxSpeed = parseInt(parallaxedElement.attributes['parallax-speed'], 10); | |
if (!isNaN(parallaxSpeed)) { | |
parallaxedElement.top = -1 * parallaxSpeed * parallaxParentTop; | |
} | |
} | |
}); | |
} | |
}); | |
}(window.davidlwatsonjr = window.davidlwatsonjr || {})); | |
</script> |
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