Bootstrap snippet. bs4 horizontal timeline

This Bootstrap snippet. bs4 horizontal timeline, was created to help web designers,
front-end developers and back-end developer save time. Use it in your project and build your app faster,
You can also download the HTML, CSS, and JS code.
tags: timeline

HTML code

This is the html code used to create this bootstrap snippet, You can copy, paste, change, customize and run the following HTML code to get a result like the one shown in the preview selection

<div class="row">
        <div class="col-lg-12">
          <section class="cd-horizontal-timeline loaded">
            <div class="timeline">
              <div class="events-wrapper">
                <div class="events" style="width: 1800px; transform: translateX(-420px);">
                  <ol>
                    <li><a href="#0" data-date="16/01/2014" class="older-event" style="left: 120px;">16 Jan</a></li>
                    <li><a href="#0" data-date="28/02/2014" style="left: 300px;" class="older-event">28 Feb</a></li>
                    <li><a href="#0" data-date="20/04/2014" style="left: 480px;" class="older-event">20 Mar</a></li>
                    <li><a href="#0" data-date="20/05/2014" style="left: 600px;" class="older-event">20 May</a></li>
                    <li><a href="#0" data-date="09/07/2014" style="left: 780px;" class="older-event">09 Jul</a></li>
                    <li><a href="#0" data-date="30/08/2014" style="left: 960px;" class="older-event">30 Aug</a></li>
                    <li><a href="#0" data-date="15/09/2014" style="left: 1020px;" class="older-event">15 Sep</a></li>
                    <li><a href="#0" data-date="01/11/2014" style="left: 1200px;" class="selected">01 Nov</a></li>
                    <li><a href="#0" data-date="10/12/2014" style="left: 1380px;">10 Dec</a></li>
                    <li><a href="#0" data-date="19/01/2015" style="left: 1500px;">29 Jan</a></li>
                    <li><a href="#0" data-date="03/03/2015" style="left: 1680px;">3 Mar</a></li>
                  </ol>

                  <span class="filling-line" aria-hidden="true" style="transform: scaleX(0.681081);"></span>
                </div> <!-- .events -->
              </div> <!-- .events-wrapper -->
                
              <ul class="cd-timeline-navigation">
                <li><a href="#0" class="prev">Prev</a></li>
                <li><a href="#0" class="next">Next</a></li>
              </ul> <!-- .cd-timeline-navigation -->
            </div> <!-- .timeline -->

            <div class="events-content" style="height: 227px;">
              <ol>
                <li class="" data-date="16/01/2014">
                  <h2>Horizontal Timeline</h2>
                  <em>January 16th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="28/02/2014">
                  <h2>Event title here</h2>
                  <em>February 28th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="20/04/2014">
                  <h2>Event title here</h2>
                  <em>March 20th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="20/05/2014">
                  <h2>Event title here</h2>
                  <em>May 20th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="09/07/2014">
                  <h2>Event title here</h2>
                  <em>July 9th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="30/08/2014">
                  <h2>Event title here</h2>
                  <em>August 30th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="15/09/2014">
                  <h2>Event title here</h2>
                  <em>September 15th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="01/11/2014" class="selected">
                  <h2>Event title here</h2>
                  <em>November 1st, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="10/12/2014">
                  <h2>Event title here</h2>
                  <em>December 10th, 2014</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="19/01/2015">
                  <h2>Event title here</h2>
                  <em>January 19th, 2015</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>

                <li data-date="03/03/2015">
                  <h2>Event title here</h2>
                  <em>March 3rd, 2015</em>
                  <p> 
                    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum praesentium officia, fugit recusandae ipsa, quia velit nulla adipisci? Consequuntur aspernatur at, eaque hic repellendus sit dicta consequatur quae, ut harum ipsam molestias maxime non nisi reiciendis eligendi! Doloremque quia pariatur harum ea amet quibusdam quisquam, quae, temporibus dolores porro doloribus.
                  </p>
                </li>
              </ol>
            </div> <!-- .events-content -->
          </section>
        </div>
      </div>

CSS code

This is the css code used to create this bootstrap snippet, You can copy, paste, change, customize and run the following CSS code to get a result Like the one shown in the preview selection


/* -------------------------------- 

Main Components 

-------------------------------- */

ol,li {
   list-style-type: none;
}

.cd-horizontal-timeline {
  opacity: 0;
  margin: 2em auto;
  -webkit-transition: opacity 0.2s;
  -moz-transition: opacity 0.2s;
  transition: opacity 0.2s;
}
.cd-horizontal-timeline::before {
  /* never visible - this is used in jQuery to check the current MQ */
  content: 'mobile';
  display: none;
}
.cd-horizontal-timeline.loaded {
  /* show the timeline after events position has been set (using JavaScript) */
  opacity: 1;
}
.cd-horizontal-timeline .timeline {
  position: relative;
  height: 100px;
  width: 90%;
  max-width: 800px;
  margin: 0 auto;
}
.cd-horizontal-timeline .events-wrapper {
  position: relative;
  height: 100%;
  margin: 0 40px;
  overflow: hidden;
}
.cd-horizontal-timeline .events-wrapper::after, .cd-horizontal-timeline .events-wrapper::before {
  /* these are used to create a shadow effect at the sides of the timeline */
  content: '';
  position: absolute;
  z-index: 2;
  top: 0;
  height: 100%;
  width: 20px;
}
.cd-horizontal-timeline .events-wrapper::before {
  left: 0;
}
.cd-horizontal-timeline .events-wrapper::after {
  right: 0;
}
.cd-horizontal-timeline .events {
  /* this is the grey line/timeline */
  position: absolute;
  z-index: 1;
  left: 0;
  top: 49px;
  height: 2px;
  /* width will be set using JavaScript */
  background: #dfdfdf;
  -webkit-transition: -webkit-transform 0.4s;
  -moz-transition: -moz-transform 0.4s;
  transition: transform 0.4s;
}
.cd-horizontal-timeline .filling-line {
  /* this is used to create the green line filling the timeline */
  position: absolute;
  z-index: 1;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background-color: #7b9d6f;
  -webkit-transform: scaleX(0);
  -moz-transform: scaleX(0);
  -ms-transform: scaleX(0);
  -o-transform: scaleX(0);
  transform: scaleX(0);
  -webkit-transform-origin: left center;
  -moz-transform-origin: left center;
  -ms-transform-origin: left center;
  -o-transform-origin: left center;
  transform-origin: left center;
  -webkit-transition: -webkit-transform 0.3s;
  -moz-transition: -moz-transform 0.3s;
  transition: transform 0.3s;
}
.cd-horizontal-timeline .events a {
  position: absolute;
  bottom: 0;
  z-index: 2;
  text-align: center;
  font-size: 1.0rem;
  padding-bottom: 15px;
  color: #676666;
  /* fix bug on Safari - text flickering while timeline translates */
  -webkit-transform: translateZ(0);
  -moz-transform: translateZ(0);
  -ms-transform: translateZ(0);
  -o-transform: translateZ(0);
  transform: translateZ(0);
}
.cd-horizontal-timeline .events a::after {
  /* this is used to create the event spot */
  content: '';
  position: absolute;
  left: 50%;
  right: auto;
  -webkit-transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  -o-transform: translateX(-50%);
  transform: translateX(-50%);
  bottom: -5px;
  height: 12px;
  width: 12px;
  border-radius: 50%;
  border: 2px solid #dfdfdf;
  background-color: #f8f8f8;
  -webkit-transition: background-color 0.3s, border-color 0.3s;
  -moz-transition: background-color 0.3s, border-color 0.3s;
  transition: background-color 0.3s, border-color 0.3s;
}
.no-touch .cd-horizontal-timeline .events a:hover::after {
  background-color: #7b9d6f;
  border-color: #7b9d6f;
}
.cd-horizontal-timeline .events a.selected {
  pointer-events: none;
}
.cd-horizontal-timeline .events a.selected::after {
  background-color: #7b9d6f;
  border-color: #7b9d6f;
}
.cd-horizontal-timeline .events a.older-event::after {
  border-color: #7b9d6f;
}
@media only screen and (min-width: 1100px) {
  .cd-horizontal-timeline {
    margin: 6em auto;
  }
  .cd-horizontal-timeline::before {
    /* never visible - this is used in jQuery to check the current MQ */
    content: 'desktop';
  }
}

.cd-timeline-navigation a {
  /* these are the left/right arrows to navigate the timeline */
  position: absolute;
  z-index: 1;
  top: 50%;
  bottom: auto;
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  -o-transform: translateY(-50%);
  transform: translateY(-50%);
  height: 34px;
  width: 34px;
  border-radius: 50%;
  border: 2px solid rgba(0,0,0,.5);
  /* replace text with an icon */
  overflow: hidden;
  color: transparent;
  text-indent: 100%;
  white-space: nowrap;
  -webkit-transition: border-color 0.3s;
  -moz-transition: border-color 0.3s;
  transition: border-color 0.3s;
}
.cd-timeline-navigation a::after {
  /* arrow icon */
  content: '';
  position: absolute;
  height: 16px;
  width: 16px;
  left: 50%;
  top: 50%;
  bottom: auto;
  right: auto;
  -webkit-transform: translateX(-50%) translateY(-50%);
  -moz-transform: translateX(-50%) translateY(-50%);
  -ms-transform: translateX(-50%) translateY(-50%);
  -o-transform: translateX(-50%) translateY(-50%);
  transform: translateX(-50%) translateY(-50%);
  background: urlhttp://codervent.com/bulona/demo/assets/images/timeline/cd-arrow.svg) no-repeat 0 0;
}
.cd-timeline-navigation a.prev {
  left: 0;
  -webkit-transform: translateY(-50%) rotate(180deg);
  -moz-transform: translateY(-50%) rotate(180deg);
  -ms-transform: translateY(-50%) rotate(180deg);
  -o-transform: translateY(-50%) rotate(180deg);
  transform: translateY(-50%) rotate(180deg);
}
.cd-timeline-navigation a.next {
  right: 0;
}
.no-touch .cd-timeline-navigation a:hover {
  border-color: #7b9d6f;
}
.cd-timeline-navigation a.inactive {
  cursor: not-allowed;
}
.cd-timeline-navigation a.inactive::after {
  background-position: 0 -16px;
}
.no-touch .cd-timeline-navigation a.inactive:hover {
  border-color: #dfdfdf;
}

.cd-horizontal-timeline .events-content {
  position: relative;
  width: 100%;
  margin: 2em 0;
  overflow: hidden;
  -webkit-transition: height 0.4s;
  -moz-transition: height 0.4s;
  transition: height 0.4s;
}
.cd-horizontal-timeline .events-content li {
  position: absolute;
  z-index: 1;
  width: 100%;
  left: 0;
  top: 0;
  -webkit-transform: translateX(-100%);
  -moz-transform: translateX(-100%);
  -ms-transform: translateX(-100%);
  -o-transform: translateX(-100%);
  transform: translateX(-100%);
  padding: 0 5%;
  opacity: 0;
  -webkit-animation-duration: 0.4s;
  -moz-animation-duration: 0.4s;
  animation-duration: 0.4s;
  -webkit-animation-timing-function: ease-in-out;
  -moz-animation-timing-function: ease-in-out;
  animation-timing-function: ease-in-out;
}
.cd-horizontal-timeline .events-content li.selected {
  /* visible event content */
  position: relative;
  z-index: 2;
  opacity: 1;
  -webkit-transform: translateX(0);
  -moz-transform: translateX(0);
  -ms-transform: translateX(0);
  -o-transform: translateX(0);
  transform: translateX(0);
}
.cd-horizontal-timeline .events-content li.enter-right, .cd-horizontal-timeline .events-content li.leave-right {
  -webkit-animation-name: cd-enter-right;
  -moz-animation-name: cd-enter-right;
  animation-name: cd-enter-right;
}
.cd-horizontal-timeline .events-content li.enter-left, .cd-horizontal-timeline .events-content li.leave-left {
  -webkit-animation-name: cd-enter-left;
  -moz-animation-name: cd-enter-left;
  animation-name: cd-enter-left;
}
.cd-horizontal-timeline .events-content li.leave-right, .cd-horizontal-timeline .events-content li.leave-left {
  -webkit-animation-direction: reverse;
  -moz-animation-direction: reverse;
  animation-direction: reverse;
}
.cd-horizontal-timeline .events-content li > * {
  max-width: 800px;
  margin: 0 auto;
}
.cd-horizontal-timeline .events-content h2 {
  font-weight: bold;
  font-size: 2.6rem;
  font-family: "Playfair Display", serif;
  font-weight: 700;
  line-height: 1.2;
}
.cd-horizontal-timeline .events-content em {
  display: block;
  font-style: italic;
  margin: 10px auto;
}
.cd-horizontal-timeline .events-content em::before {
  content: '- ';
}
.cd-horizontal-timeline .events-content p {
  font-size: 1.4rem;
  color: #676666;
}
.cd-horizontal-timeline .events-content em, .cd-horizontal-timeline .events-content p {
  line-height: 1.6;
}
@media only screen and (min-width: 768px) {
  .cd-horizontal-timeline .events-content h2 {
    font-size: 3rem;
  }
  .cd-horizontal-timeline .events-content em {
    font-size: 1rem;
  }
  .cd-horizontal-timeline .events-content p {
    font-size: 1.0rem;
  }
}

@-webkit-keyframes cd-enter-right {
  0% {
    opacity: 0;
    -webkit-transform: translateX(100%);
  }
  100% {
    opacity: 1;
    -webkit-transform: translateX(0%);
  }
}
@-moz-keyframes cd-enter-right {
  0% {
    opacity: 0;
    -moz-transform: translateX(100%);
  }
  100% {
    opacity: 1;
    -moz-transform: translateX(0%);
  }
}
@keyframes cd-enter-right {
  0% {
    opacity: 0;
    -webkit-transform: translateX(100%);
    -moz-transform: translateX(100%);
    -ms-transform: translateX(100%);
    -o-transform: translateX(100%);
    transform: translateX(100%);
  }
  100% {
    opacity: 1;
    -webkit-transform: translateX(0%);
    -moz-transform: translateX(0%);
    -ms-transform: translateX(0%);
    -o-transform: translateX(0%);
    transform: translateX(0%);
  }
}
@-webkit-keyframes cd-enter-left {
  0% {
    opacity: 0;
    -webkit-transform: translateX(-100%);
  }
  100% {
    opacity: 1;
    -webkit-transform: translateX(0%);
  }
}
@-moz-keyframes cd-enter-left {
  0% {
    opacity: 0;
    -moz-transform: translateX(-100%);
  }
  100% {
    opacity: 1;
    -moz-transform: translateX(0%);
  }
}
@keyframes cd-enter-left {
  0% {
    opacity: 0;
    -webkit-transform: translateX(-100%);
    -moz-transform: translateX(-100%);
    -ms-transform: translateX(-100%);
    -o-transform: translateX(-100%);
    transform: translateX(-100%);
  }
  100% {
    opacity: 1;
    -webkit-transform: translateX(0%);
    -moz-transform: translateX(0%);
    -ms-transform: translateX(0%);
    -o-transform: translateX(0%);
    transform: translateX(0%);
  }
}

                                    

Javascript/Jquery code

This is the css code used to create this bootstrap snippet, You can copy, paste, change, customize and run the following JS code to get a result Like the one shown in the preview selection

jQuery(document).ready(function($){
    var timelines = $('.cd-horizontal-timeline'),
		eventsMinDistance = 60;

	(timelines.length > 0) && initTimeline(timelines);

	function initTimeline(timelines) {
		timelines.each(function(){
			var timeline = $(this),
				timelineComponents = {};
			//cache timeline components 
			timelineComponents['timelineWrapper'] = timeline.find('.events-wrapper');
			timelineComponents['eventsWrapper'] = timelineComponents['timelineWrapper'].children('.events');
			timelineComponents['fillingLine'] = timelineComponents['eventsWrapper'].children('.filling-line');
			timelineComponents['timelineEvents'] = timelineComponents['eventsWrapper'].find('a');
			timelineComponents['timelineDates'] = parseDate(timelineComponents['timelineEvents']);
			timelineComponents['eventsMinLapse'] = minLapse(timelineComponents['timelineDates']);
			timelineComponents['timelineNavigation'] = timeline.find('.cd-timeline-navigation');
			timelineComponents['eventsContent'] = timeline.children('.events-content');

			//assign a left postion to the single events along the timeline
			setDatePosition(timelineComponents, eventsMinDistance);
			//assign a width to the timeline
			var timelineTotWidth = setTimelineWidth(timelineComponents, eventsMinDistance);
			//the timeline has been initialize - show it
			timeline.addClass('loaded');

			//detect click on the next arrow
			timelineComponents['timelineNavigation'].on('click', '.next', function(event){
				event.preventDefault();
				updateSlide(timelineComponents, timelineTotWidth, 'next');
			});
			//detect click on the prev arrow
			timelineComponents['timelineNavigation'].on('click', '.prev', function(event){
				event.preventDefault();
				updateSlide(timelineComponents, timelineTotWidth, 'prev');
			});
			//detect click on the a single event - show new event content
			timelineComponents['eventsWrapper'].on('click', 'a', function(event){
				event.preventDefault();
				timelineComponents['timelineEvents'].removeClass('selected');
				$(this).addClass('selected');
				updateOlderEvents($(this));
				updateFilling($(this), timelineComponents['fillingLine'], timelineTotWidth);
				updateVisibleContent($(this), timelineComponents['eventsContent']);
			});

			//on swipe, show next/prev event content
			timelineComponents['eventsContent'].on('swipeleft', function(){
				var mq = checkMQ();
				( mq == 'mobile' ) && showNewContent(timelineComponents, timelineTotWidth, 'next');
			});
			timelineComponents['eventsContent'].on('swiperight', function(){
				var mq = checkMQ();
				( mq == 'mobile' ) && showNewContent(timelineComponents, timelineTotWidth, 'prev');
			});

			//keyboard navigation
			$(document).keyup(function(event){
				if(event.which=='37' && elementInViewport(timeline.get(0)) ) {
					showNewContent(timelineComponents, timelineTotWidth, 'prev');
				} else if( event.which=='39' && elementInViewport(timeline.get(0))) {
					showNewContent(timelineComponents, timelineTotWidth, 'next');
				}
			});
		});
	}

	function updateSlide(timelineComponents, timelineTotWidth, string) {
		//retrieve translateX value of timelineComponents['eventsWrapper']
		var translateValue = getTranslateValue(timelineComponents['eventsWrapper']),
			wrapperWidth = Number(timelineComponents['timelineWrapper'].css('width').replace('px', ''));
		//translate the timeline to the left('next')/right('prev') 
		(string == 'next') 
			? translateTimeline(timelineComponents, translateValue - wrapperWidth + eventsMinDistance, wrapperWidth - timelineTotWidth)
			: translateTimeline(timelineComponents, translateValue + wrapperWidth - eventsMinDistance);
	}

	function showNewContent(timelineComponents, timelineTotWidth, string) {
		//go from one event to the next/previous one
		var visibleContent =  timelineComponents['eventsContent'].find('.selected'),
			newContent = ( string == 'next' ) ? visibleContent.next() : visibleContent.prev();

		if ( newContent.length > 0 ) { //if there's a next/prev event - show it
			var selectedDate = timelineComponents['eventsWrapper'].find('.selected'),
				newEvent = ( string == 'next' ) ? selectedDate.parent('li').next('li').children('a') : selectedDate.parent('li').prev('li').children('a');
			
			updateFilling(newEvent, timelineComponents['fillingLine'], timelineTotWidth);
			updateVisibleContent(newEvent, timelineComponents['eventsContent']);
			newEvent.addClass('selected');
			selectedDate.removeClass('selected');
			updateOlderEvents(newEvent);
			updateTimelinePosition(string, newEvent, timelineComponents);
		}
	}

	function updateTimelinePosition(string, event, timelineComponents) {
		//translate timeline to the left/right according to the position of the selected event
		var eventStyle = window.getComputedStyle(event.get(0), null),
			eventLeft = Number(eventStyle.getPropertyValue("left").replace('px', '')),
			timelineWidth = Number(timelineComponents['timelineWrapper'].css('width').replace('px', '')),
			timelineTotWidth = Number(timelineComponents['eventsWrapper'].css('width').replace('px', ''));
		var timelineTranslate = getTranslateValue(timelineComponents['eventsWrapper']);

        if( (string == 'next' && eventLeft > timelineWidth - timelineTranslate) || (string == 'prev' && eventLeft < - timelineTranslate) ) {
        	translateTimeline(timelineComponents, - eventLeft + timelineWidth/2, timelineWidth - timelineTotWidth);
        }
	}

	function translateTimeline(timelineComponents, value, totWidth) {
		var eventsWrapper = timelineComponents['eventsWrapper'].get(0);
		value = (value > 0) ? 0 : value; //only negative translate value
		value = ( !(typeof totWidth === 'undefined') &&  value < totWidth ) ? totWidth : value; //do not translate more than timeline width
		setTransformValue(eventsWrapper, 'translateX', value+'px');
		//update navigation arrows visibility
		(value == 0 ) ? timelineComponents['timelineNavigation'].find('.prev').addClass('inactive') : timelineComponents['timelineNavigation'].find('.prev').removeClass('inactive');
		(value == totWidth ) ? timelineComponents['timelineNavigation'].find('.next').addClass('inactive') : timelineComponents['timelineNavigation'].find('.next').removeClass('inactive');
	}

	function updateFilling(selectedEvent, filling, totWidth) {
		//change .filling-line length according to the selected event
		var eventStyle = window.getComputedStyle(selectedEvent.get(0), null),
			eventLeft = eventStyle.getPropertyValue("left"),
			eventWidth = eventStyle.getPropertyValue("width");
		eventLeft = Number(eventLeft.replace('px', '')) + Number(eventWidth.replace('px', ''))/2;
		var scaleValue = eventLeft/totWidth;
		setTransformValue(filling.get(0), 'scaleX', scaleValue);
	}

	function setDatePosition(timelineComponents, min) {
		for (i = 0; i < timelineComponents['timelineDates'].length; i++) { 
		    var distance = daydiff(timelineComponents['timelineDates'][0], timelineComponents['timelineDates'][i]),
		    	distanceNorm = Math.round(distance/timelineComponents['eventsMinLapse']) + 2;
		    timelineComponents['timelineEvents'].eq(i).css('left', distanceNorm*min+'px');
		}
	}

	function setTimelineWidth(timelineComponents, width) {
		var timeSpan = daydiff(timelineComponents['timelineDates'][0], timelineComponents['timelineDates'][timelineComponents['timelineDates'].length-1]),
			timeSpanNorm = timeSpan/timelineComponents['eventsMinLapse'],
			timeSpanNorm = Math.round(timeSpanNorm) + 4,
			totalWidth = timeSpanNorm*width;
		timelineComponents['eventsWrapper'].css('width', totalWidth+'px');
		updateFilling(timelineComponents['eventsWrapper'].find('a.selected'), timelineComponents['fillingLine'], totalWidth);
		updateTimelinePosition('next', timelineComponents['eventsWrapper'].find('a.selected'), timelineComponents);
	
		return totalWidth;
	}

	function updateVisibleContent(event, eventsContent) {
		var eventDate = event.data('date'),
			visibleContent = eventsContent.find('.selected'),
			selectedContent = eventsContent.find('[data-date="'+ eventDate +'"]'),
			selectedContentHeight = selectedContent.height();

		if (selectedContent.index() > visibleContent.index()) {
			var classEnetering = 'selected enter-right',
				classLeaving = 'leave-left';
		} else {
			var classEnetering = 'selected enter-left',
				classLeaving = 'leave-right';
		}

		selectedContent.attr('class', classEnetering);
		visibleContent.attr('class', classLeaving).one('webkitAnimationEnd oanimationend msAnimationEnd animationend', function(){
			visibleContent.removeClass('leave-right leave-left');
			selectedContent.removeClass('enter-left enter-right');
		});
		eventsContent.css('height', selectedContentHeight+'px');
	}

	function updateOlderEvents(event) {
		event.parent('li').prevAll('li').children('a').addClass('older-event').end().end().nextAll('li').children('a').removeClass('older-event');
	}

	function getTranslateValue(timeline) {
		var timelineStyle = window.getComputedStyle(timeline.get(0), null),
			timelineTranslate = timelineStyle.getPropertyValue("-webkit-transform") ||
         		timelineStyle.getPropertyValue("-moz-transform") ||
         		timelineStyle.getPropertyValue("-ms-transform") ||
         		timelineStyle.getPropertyValue("-o-transform") ||
         		timelineStyle.getPropertyValue("transform");

        if( timelineTranslate.indexOf('(') >=0 ) {
        	var timelineTranslate = timelineTranslate.split('(')[1];
    		timelineTranslate = timelineTranslate.split(')')[0];
    		timelineTranslate = timelineTranslate.split(',');
    		var translateValue = timelineTranslate[4];
        } else {
        	var translateValue = 0;
        }

        return Number(translateValue);
	}

	function setTransformValue(element, property, value) {
		element.style["-webkit-transform"] = property+"("+value+")";
		element.style["-moz-transform"] = property+"("+value+")";
		element.style["-ms-transform"] = property+"("+value+")";
		element.style["-o-transform"] = property+"("+value+")";
		element.style["transform"] = property+"("+value+")";
	}

	//based on http://stackoverflow.com/questions/542938/how-do-i-get-the-number-of-days-between-two-dates-in-javascript
	function parseDate(events) {
		var dateArrays = [];
		events.each(function(){
			var singleDate = $(this),
				dateComp = singleDate.data('date').split('T');
			if( dateComp.length > 1 ) { //both DD/MM/YEAR and time are provided
				var dayComp = dateComp[0].split('/'),
					timeComp = dateComp[1].split(':');
			} else if( dateComp[0].indexOf(':') >=0 ) { //only time is provide
				var dayComp = ["2000", "0", "0"],
					timeComp = dateComp[0].split(':');
			} else { //only DD/MM/YEAR
				var dayComp = dateComp[0].split('/'),
					timeComp = ["0", "0"];
			}
			var	newDate = new Date(dayComp[2], dayComp[1]-1, dayComp[0], timeComp[0], timeComp[1]);
			dateArrays.push(newDate);
		});
	    return dateArrays;
	}

	function daydiff(first, second) {
	    return Math.round((second-first));
	}

	function minLapse(dates) {
		//determine the minimum distance among events
		var dateDistances = [];
		for (i = 1; i < dates.length; i++) { 
		    var distance = daydiff(dates[i-1], dates[i]);
		    dateDistances.push(distance);
		}
		return Math.min.apply(null, dateDistances);
	}

	/*
		How to tell if a DOM element is visible in the current viewport?
		http://stackoverflow.com/questions/123999/how-to-tell-if-a-dom-element-is-visible-in-the-current-viewport
	*/
	function elementInViewport(el) {
		var top = el.offsetTop;
		var left = el.offsetLeft;
		var width = el.offsetWidth;
		var height = el.offsetHeight;

		while(el.offsetParent) {
		    el = el.offsetParent;
		    top += el.offsetTop;
		    left += el.offsetLeft;
		}

		return (
		    top < (window.pageYOffset + window.innerHeight) &&
		    left < (window.pageXOffset + window.innerWidth) &&
		    (top + height) > window.pageYOffset &&
		    (left + width) > window.pageXOffset
		);
	}

	function checkMQ() {
		//check if mobile or desktop device
		return window.getComputedStyle(document.querySelector('.cd-horizontal-timeline'), '::before').getPropertyValue('content').replace(/'/g, "").replace(/"/g, "");
	}
}); 

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About this bootstrap snippet

This bootstrap snippet, bs4 horizontal timeline, was published on Oct 14th, 19:49 by Dey Dey and it is free.

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Bootstrap 4.3.1

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semantic html 5

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