1 files changed, 71 insertions, 0 deletions
diff --git a/pydis_site/static/js/timeline/main.js b/pydis_site/static/js/timeline/main.js
new file mode 100644
index 00000000..a4bf4f31
--- /dev/null
+++ b/pydis_site/static/js/timeline/main.js
@@ -0,0 +1,71 @@
+(function(){
+  // Vertical Timeline - by CodyHouse.co
+	function VerticalTimeline( element ) {
+		this.element = element;
+		this.blocks = this.element.getElementsByClassName("cd-timeline__block");
+		this.images = this.element.getElementsByClassName("cd-timeline__img");
+		this.contents = this.element.getElementsByClassName("cd-timeline__content");
+		this.offset = 0.8;
+		this.hideBlocks();
+	};
+
+	VerticalTimeline.prototype.hideBlocks = function() {
+		if ( !"classList" in document.documentElement ) {
+			return; // no animation on older browsers
+		}
+		//hide timeline blocks which are outside the viewport
+		var self = this;
+		for( var i = 0; i < this.blocks.length; i++) {
+			(function(i){
+				if( self.blocks[i].getBoundingClientRect().top > window.innerHeight*self.offset ) {
+					self.images[i].classList.add("cd-timeline__img--hidden");
+					self.contents[i].classList.add("cd-timeline__content--hidden");
+				}
+			})(i);
+		}
+	};
+
+	VerticalTimeline.prototype.showBlocks = function() {
+		if ( ! "classList" in document.documentElement ) {
+			return;
+		}
+		var self = this;
+		for( var i = 0; i < this.blocks.length; i++) {
+			(function(i){
+				if( self.contents[i].classList.contains("cd-timeline__content--hidden") && self.blocks[i].getBoundingClientRect().top <= window.innerHeight*self.offset ) {
+					// add bounce-in animation
+					self.images[i].classList.add("cd-timeline__img--bounce-in");
+					self.contents[i].classList.add("cd-timeline__content--bounce-in");
+					self.images[i].classList.remove("cd-timeline__img--hidden");
+					self.contents[i].classList.remove("cd-timeline__content--hidden");
+				}
+			})(i);
+		}
+	};
+
+	var verticalTimelines = document.getElementsByClassName("js-cd-timeline"),
+		verticalTimelinesArray = [],
+		scrolling = false;
+	if( verticalTimelines.length > 0 ) {
+		for( var i = 0; i < verticalTimelines.length; i++) {
+			(function(i){
+				verticalTimelinesArray.push(new VerticalTimeline(verticalTimelines[i]));
+			})(i);
+		}
+
+		//show timeline blocks on scrolling
+		window.addEventListener("scroll", function(event) {
+			if( !scrolling ) {
+				scrolling = true;
+				(!window.requestAnimationFrame) ? setTimeout(checkTimelineScroll, 250) : window.requestAnimationFrame(checkTimelineScroll);
+			}
+		});
+	}
+
+	function checkTimelineScroll() {
+		verticalTimelinesArray.forEach(function(timeline){
+			timeline.showBlocks();
+		});
+		scrolling = false;
+	};
+})();