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js.js
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js.js
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/*
Original work by Thomas Hardern. https://www.behance.net/thomasaeh126fb
*/
var currentSlide = 0; // number of current slide - 0 is info at start, 1 is slide 1, 2 is slide 2....
var TOTALSLIDES = 19; // total number of slides, starting from 1 when excluding the info, references, and "the end" slides
var billion = 1000000000;
var million = 1000000;
var thousand = 1000;
var total = 13.8 * billion;
function removeContentWrapperBackground() { // switch to dark theme
"use strict";
document.body.style.color = "#FFFFFF";
document.getElementById("contentWrapper").style.background = "none";
document.getElementById("contentWrapper").style.boxShadow = "none";
}
function addContentWrapperBackground() { // switch to light theme
"use strict";
document.body.style.color = "#262626";
document.getElementById("contentWrapper").style.backgroundColor = "rgba(250,250,250,0.5)";
document.getElementById("contentWrapper").style.boxShadow = "0px 0px 1px 2px #888";
}
function addWrapperBackgroundMouseOver() {
document.getElementById("addWrapperBackground").style.bottom = "0px";
document.getElementById("addWrapperBackground").style.right = "0px";
}
function addWrapperBackgroundMouseOut() {
"use strict";
document.getElementById("addWrapperBackground").style.bottom = "2px";
document.getElementById("addWrapperBackground").style.right = "2px";
}
function removeWrapperBackgroundMouseOver() {
"use strict";
document.getElementById("removeWrapperBackground").style.bottom = "0px";
document.getElementById("removeWrapperBackground").style.right = "62px";
}
function removeWrapperBackgroundMouseOut() {
"use strict";
document.getElementById("removeWrapperBackground").style.bottom = "2px";
document.getElementById("removeWrapperBackground").style.right = "64px";
}
function setProgressValue(noIn) {
"use strict";
if (noIn > 0) {
var slideNoValueToSet = 0;
switch(noIn) {
case 1: // overview
slideNoValueToSet = 0;
break;
case 2: // Big Bang
slideNoValueToSet = 0;
break;
case 3: // creation of Earth
slideNoValueToSet = total - 4.5 * billion;
break;
case 4: // first life
slideNoValueToSet = total - 3.5 * billion;
break;
case 5: // aerobic photo. & GOE
slideNoValueToSet = total - 2.4 * billion;
break;
case 6: // development of eukaryotes
slideNoValueToSet = total - 1.8 * billion;
break;
case 7: // first multicellular animals
slideNoValueToSet = total - 850 * million;
break;
case 8: // 2nd snowball earth
slideNoValueToSet = total - 700 * million;
break;
case 9: // 1st chordates and vertebrates
slideNoValueToSet = total - 525 * million;
break;
case 10: // cambrian explosion and GOBE
slideNoValueToSet = total - 482.5 * million;
break;
case 11: // 1st plants and animals on Earth
slideNoValueToSet = total - 430 * million;
break;
case 12: // P/T extinction
slideNoValueToSet = total - 251 * million;
break;
case 13: // T/J extinction
slideNoValueToSet = total - 201.4 * million;
break;
case 14: // Montromemes, birds, and placental mammals
slideNoValueToSet = total - 160 * million;
break;
case 15: // Cretaceous-Paleogene (K/Pg) extinction
slideNoValueToSet = total - 66 * million;
break;
case 16: // Mammals develop into primates
slideNoValueToSet = total - 55 * million;
break;
case 17: // Palaeocene/Eocene extinction
slideNoValueToSet = total - 55 * million;
break;
case 18: // Development of humans
slideNoValueToSet = total - 100 * thousand;
break;
case 19: // Culture and society develop
slideNoValueToSet = total - 0.5 * thousand;
break;
case 20: // finish
slideNoValueToSet = total;
break;
default: // info or before
slideNoValueToSet = 0;
break;
}
document.getElementById("slideNo").value = slideNoValueToSet;
showProgressBar();
}
else {
hideProgressBar();
}
}
function showProgressBar() {
"use strict";
document.getElementById("slideNo").style.visibility = "visible";
document.getElementById("slideNoLabel").style.visibility = "visible";
}
function hideProgressBar() {
"use strict";
document.getElementById("slideNo").style.visibility = "hidden";
document.getElementById("slideNoLabel").style.visibility = "hidden";
}
function backMouseOver() {
"use strict";
document.getElementById("backButton").style.position="absolute";
document.getElementById("backButton").style.margin="-22px 0px 0px 2px";
}
function forwardMouseOver() {
"use strict";
document.getElementById("forwardButton").style.position="absolute";
document.getElementById("forwardButton").style.margin="-22px 2px 0px 0px";
}
function backMouseOut() {
"use strict";
document.getElementById("backButton").style.position = "absolute";
document.getElementById("backButton").style.margin = "-25px 0px 0px 0px";
}
function forwardMouseOut() {
"use strict";
document.getElementById("forwardButton").style.position = "absolute";
document.getElementById("forwardButton").style.margin = "-25px 0px 0px 0px";
}
function hideAllSlides() {
"use strict";
var slides = document.getElementsByClassName("slide");
for (var i=0; i < slides.length; i = i + 1) {
slides[i].style.visibility = "hidden";
}
document.getElementById("backButton").style.visibility = "visible";
document.getElementById("forwardButton").style.visibility = "visible";
document.getElementById("slideNo").innerHTML="";
}
function showReferences() {
"use strict";
hideAllSlides();
document.getElementById("forwardButton").style.visibility = "hidden";
document.getElementById("references").style.visibility = "visible";
currentSlide = -1;
hideProgressBar();
setProgressValue(0);
}
function showInfo() {
"use strict";
hideAllSlides();
document.getElementById("backButton").style.visibility = "hidden";
document.getElementById("info").style.visibility = "visible";
currentSlide = 0;
hideProgressBar();
setProgressValue(0);
}
function goBack() {
"use strict";
if (currentSlide == -1 || currentSlide == 1) { // going back from references or slide 1
showInfo();
}
else {
var slideToBeNo = currentSlide - 1;
var slideToBe = "slide" + slideToBeNo;
hideAllSlides();
setProgressValue(slideToBeNo);
document.getElementById(slideToBe).style.visibility = "visible";
currentSlide = slideToBeNo;
}
}
function goForward() {
"use strict";
var slideToBeNo = currentSlide + 1;
var slideToBe = "slide" + slideToBeNo;
hideAllSlides();
setProgressValue(slideToBeNo);
document.getElementById(slideToBe).style.visibility = "visible";
if (slideToBeNo == TOTALSLIDES + 1) {
document.getElementById("forwardButton").style.visibility = "hidden";
}
currentSlide = slideToBeNo;
}
function checkKey(e) {
"use strict";
e = e || window.event;
if (e.keyCode == '37') { // left arrow
if (currentSlide != 0) { // can move left
goBack();
}
}
else if (e.keyCode == '39') { // right arrow
if (currentSlide != -1 && currentSlide != TOTALSLIDES + 1) { // can move right
goForward();
}
}
else if (e.keyCode == '109' || e.keyCode == '189') { // minus sign on diff keys
removeContentWrapperBackground();
}
else if (e.keyCode == '107' || e.keyCode == '187') { // plus sign on diff keys
addContentWrapperBackground();
}
}
document.onkeydown = checkKey;