beautifulSA-jekyll/assets/js/beautifuljekyll.js

115 lines
3.7 KiB
JavaScript

// Dean Attali / Beautiful Jekyll 2020
var BeautifulJekyllJS = {
bigImgEl : null,
numImgs : null,
init : function() {
setTimeout(BeautifulJekyllJS.initNavbar, 10);
// Shorten the navbar after scrolling a little bit down
$(window).scroll(function() {
if ($(".navbar").offset().top > 50) {
$(".navbar").addClass("top-nav-short");
} else {
$(".navbar").removeClass("top-nav-short");
}
});
// On mobile, hide the avatar when expanding the navbar menu
$('#main-navbar').on('show.bs.collapse', function () {
$(".navbar").addClass("top-nav-expanded");
});
$('#main-navbar').on('hidden.bs.collapse', function () {
$(".navbar").removeClass("top-nav-expanded");
});
// show the big header image
BeautifulJekyllJS.initImgs();
},
initNavbar : function() {
// Set the navbar-dark/light class based on its background color
const rgb = $('.navbar').css("background-color").replace(/[^\d,]/g,'').split(",");
const brightness = Math.round(( // http://www.w3.org/TR/AERT#color-contrast
parseInt(rgb[0]) * 299 +
parseInt(rgb[1]) * 587 +
parseInt(rgb[2]) * 114
) / 1000);
if (brightness <= 125) {
$(".navbar").removeClass("navbar-light").addClass("navbar-dark");
}
},
initImgs : function() {
// If the page was large images to randomly select from, choose an image
if ($("#header-big-imgs").length > 0) {
BeautifulJekyllJS.bigImgEl = $("#header-big-imgs");
BeautifulJekyllJS.numImgs = BeautifulJekyllJS.bigImgEl.attr("data-num-img");
// 2fc73a3a967e97599c9763d05e564189
// set an initial image
var imgInfo = BeautifulJekyllJS.getImgInfo();
var src = imgInfo.src;
var desc = imgInfo.desc;
BeautifulJekyllJS.setImg(src, desc);
// For better UX, prefetch the next image so that it will already be loaded when we want to show it
var getNextImg = function() {
var imgInfo = BeautifulJekyllJS.getImgInfo();
var src = imgInfo.src;
var desc = imgInfo.desc;
var prefetchImg = new Image();
prefetchImg.src = src;
// if I want to do something once the image is ready: `prefetchImg.onload = function(){}`
setTimeout(function(){
var img = $("<div></div>").addClass("big-img-transition").css("background-image", 'url(' + src + ')');
$(".intro-header.big-img").prepend(img);
setTimeout(function(){ img.css("opacity", "1"); }, 50);
// after the animation of fading in the new image is done, prefetch the next one
//img.one("transitioned webkitTransitionEnd oTransitionEnd MSTransitionEnd", function(){
setTimeout(function() {
BeautifulJekyllJS.setImg(src, desc);
img.remove();
getNextImg();
}, 1000);
//});
}, 6000);
};
// If there are multiple images, cycle through them
if (BeautifulJekyllJS.numImgs > 1) {
getNextImg();
}
}
},
getImgInfo : function() {
var randNum = Math.floor((Math.random() * BeautifulJekyllJS.numImgs) + 1);
var src = BeautifulJekyllJS.bigImgEl.attr("data-img-src-" + randNum);
var desc = BeautifulJekyllJS.bigImgEl.attr("data-img-desc-" + randNum);
return {
src : src,
desc : desc
}
},
setImg : function(src, desc) {
$(".intro-header.big-img").css("background-image", 'url(' + src + ')');
if (typeof desc !== typeof undefined && desc !== false) {
$(".img-desc").text(desc).show();
} else {
$(".img-desc").hide();
}
}
};
// 2fc73a3a967e97599c9763d05e564189
document.addEventListener('DOMContentLoaded', BeautifulJekyllJS.init);