PlayYTVideosOnScroll

by kosmos

HTML

<script src="https://www.youtube.com/iframe_api"></script>
<div class="container">
    <ul class="tabs">
        <li class="tab-link current" data-tab="tab-1">Tab One</li>
        <li class="tab-link" data-tab="tab-2">Tab Two</li>
        <li class="tab-link" data-tab="tab-3">Tab Three</li>
        <li class="tab-link" data-tab="tab-4">Tab Four</li>
    </ul>

    <div id="tab-1" class="tab-content current">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
    </div>
    <div id="tab-2" class="tab-content">
        Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
    </div>
    <div id="tab-3" class="tab-content">
        Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
    </div>
    <div id="tab-4" class="tab-content">
        <iframe id="playerA" width="300" height="220" src="https://www.youtube.com/embed/k7RjSpYchA4?rel=0&enablejsapi=1" frameborder="0" allowfullscreen></iframe>
        <div style="margin-bottom: 500px;"></div>
        <iframe id="playerB" width="300" height="220" src="https://www.youtube.com/embed/k7RjSpYchA4?rel=0&enablejsapi=1" frameborder="0" allowfullscreen></iframe>
    </div>
</div>

CSS

body{
    margin-top: 100px;
    font-family: 'Trebuchet MS', serif;
    line-height: 1.6
}
.container{
    width: 800px;
    margin: 0 auto;
}



ul.tabs{
    margin: 0px;
    padding: 0px;
    list-style: none;
}
ul.tabs li{
    background: none;
    color: #222;
    display: inline-block;
    padding: 10px 15px;
    cursor: pointer;
}

ul.tabs li.current{
    background: #ededed;
    color: #222;
}

.tab-content{
    display: none;
    background: #ededed;
    padding: 15px;
}

.tab-content.current{
    display: inherit;
}

JavaScript

var LoadVideo = function(player_id){

    var Program = {

        Init: function(){
            this.NewPlayer();
            this.EventHandler();
        },

        NewPlayer: function(){
            var _this = this;
            this.Player = new YT.Player(player_id, {});
            _this.Player.$element = $('#' + player_id);
        },

        Play: function(){
            console.log(this.Player.IsReady);
            if( this.Player.getPlayerState() === 1 ) return;
            this.Player.playVideo();
        },

        Pause: function(){
            if( this.Player.getPlayerState() === 2 ) return;
            this.Player.pauseVideo();
        },

        ScrollControl: function(){
            if( Utils.IsElementInViewport(this.Player.$element[0]) ) this.Play();
            else this.Pause();
        },

        EventHandler: function(){
            var _this = this;
            $(window).on('scroll', function(){
                _this.ScrollControl();
            });

            $('.tab-link').on('click', function(){
                var $target = $('#' + $(this).data().tab);
                if( !!$('iframe', $target).length && $('iframe', $target).attr('id') == _this.Player.$element.attr('id') ){
                    _this.Play();
                }
            });

        }

    };

    var Utils = {

        /** @author http://stackoverflow.com/a/7557433/1684970 */
        IsElementInViewport: function(el){
            if (typeof jQuery === "function" && el instanceof jQuery) el = el[0];
            var rect = el.getBoundingClientRect();
            return (
                rect.top >= 0 &&
                rect.left >= 0 &&
                rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
                rect.right <= (window.innerWidth || document.documentElement.clientWidth)
            );
        }

    };

    Program.Init();

};

$(function(){
    $('ul.tabs li').on('click', function(){
        var tab_id =...