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September 12, 2017 12:51
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Creates a reading indicator
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| (function(){ | |
| var Indicator = function(){ | |
| var self = this, bar; | |
| this.init = function init() { | |
| self.createIndicator(); | |
| window.onscroll = onScroll; | |
| onScroll(); | |
| }; | |
| this.createIndicator = function createIndicator() { | |
| bar = document.createElement('div'); | |
| bar.style.position = "fixed"; | |
| bar.style.top = 0; | |
| bar.style.left = 0; | |
| bar.style.right = 0; | |
| bar.style.display = "block"; | |
| bar.style.width = "0%"; | |
| bar.style.height = "1px"; | |
| bar.style.backgroundColor = "#ff0000"; | |
| bar.style.zIndex = 99999999; | |
| document.body.appendChild(bar); | |
| }; | |
| function onScroll(e) { | |
| bar.style.width = Math.floor(((getScrollPosition() + getWindowHeight()) / getMaxDocumentHeight()) * 100) + "%"; | |
| } | |
| function getWindowHeight() { | |
| return window.innerHeight | |
| || document.documentElement.clientHeight | |
| || document.body.clientHeight | |
| || 0; | |
| } | |
| function getMaxDocumentHeight() { | |
| return Math.max( | |
| document.body.scrollHeight || 0 | |
| ,document.documentElement.scrollHeight || 0 | |
| ,document.body.offsetHeight || 0 | |
| ,document.documentElement.offsetHeight || 0 | |
| ,document.body.clientHeight || 0 | |
| ,document.documentElement.clientHeight || 0 | |
| ); | |
| } | |
| function getScrollPosition() { | |
| return window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop || 0; | |
| } | |
| self.init(); | |
| }; | |
| new Indicator(); | |
| })(); |
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