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HTML

              
                <html>
<head>
    <style>
        .item {width:300px; display: inline-block; }
        .item .itemtitle {font-weight:bold; font-size:2em;}
        .hidden {display:none;}
    </style>
</head>
<body>
    <h1>Amalgam Comics Characters</h1>
<div id="listing">

    <!-- first few items are loaded normally -->
    <div class="item">
        <img 
            src="https://comicvine.gamespot.com/a/uploads/scale_small/0/229/305994-84919-dark-claw.jpg" 
            alt="Dark Claw"
            width="300px" />
        <span class="itemtitle">Dark Claw</span>
    </div>
    
    <div class="item">
        <img 
            src="https://comicvine.gamespot.com/a/uploads/scale_small/0/3664/806882-x1.jpg" 
            alt="Super Soldier"
            width="300px" />
        <span class="itemtitle">Super Soldier</span>
    </div>
    
    <div class="item">
        <img 
            src="https://comicvine.gamespot.com/a/uploads/scale_small/6/68065/7058388-spiderboy0.jpg" 
            alt="Spider Boy"
            width="300px" />
        <span class="itemtitle">Spider Boy</span>
    </div>
    
    <!-- everything after this is lazy -->
    <div id="viewMore">
        <a href="flatpage.html#more">View more</a>
    </div>
    <span id="nextPage" class="hidden">
        
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="http://vignette1.wikia.nocookie.net/amalgam/images/7/7c/Iron_Lantern.jpg/revision/latest?cb=20110828093145" 
            alt="Iron Lantern"
            width="300px" />
        <noscript>
            <img 
                src="http://vignette1.wikia.nocookie.net/amalgam/images/7/7c/Iron_Lantern.jpg/revision/latest?cb=20110828093145" 
                alt="Iron Lantern"
                width="300px" />
        </noscript>
        <span class="itemtitle">Iron Lantern</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/8/80523/1520527-amazon2cl4.jpg" 
            alt="Amazon"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/8/80523/1520527-amazon2cl4.jpg" 
                alt="Amazon"
                width="300px" />
        </noscript>
        <span class="itemtitle">Amazon</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/0/8056/348302-52652-doctor-doomsday.jpg" 
            alt="Doctor Doomsday"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/0/8056/348302-52652-doctor-doomsday.jpg" 
                alt="Doctor Doomsday"
                width="300px" />
        </noscript>
        <span class="itemtitle">Doctor Doomsday</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/2/26751/516993-catsai.jpg" 
            alt="Catsai"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/2/26751/516993-catsai.jpg" 
                alt="Catsai"
                width="300px" />
        </noscript>
        <span class="itemtitle">Catsai</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/1/14607/332382-66823-moon-knight.jpg" 
            alt="Moonwing"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/1/14607/332382-66823-moon-knight.jpg" 
                alt="Moonwing"
                width="300px" />
        </noscript>
        <span class="itemtitle">Moonwing</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/3/38919/971427-speed_demon.jpg" 
            alt="Speed Demon"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/3/38919/971427-speed_demon.jpg" 
                alt="Speed Demon"
                width="300px" />
        </noscript>
        <span class="itemtitle">Speed Demon</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/1/15921/398228-114420-mercury.jpg" 
            alt="Mercury"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/1/15921/398228-114420-mercury.jpg" 
                alt="Mercury"
                width="300px" />
        </noscript>
        <span class="itemtitle">Mercury</span>
    </div>
    
    <div class="item">
        <img 
            src="http://spacergif.org/spacer.gif" 
            class="lazy" 
            data-src="https://comicvine.gamespot.com/a/uploads/scale_small/0/3853/195688-181966-dr-strangefate.jpg" 
            alt="Dr. Strangefate"
            width="300px" />
        <noscript>
            <img 
                src="https://comicvine.gamespot.com/a/uploads/scale_small/0/3853/195688-181966-dr-strangefate.jpg" 
                alt="Dr. Strangefate"
                width="300px" />
        </noscript>
        <span class="itemtitle">Dr. Strangefate</span>
    </div>

  </span>
 </div>

<script>
var lazy = [];

registerListener('load', setLazy);
registerListener('load', lazyLoad);
registerListener('scroll', lazyLoad);
registerListener('resize', lazyLoad);

function setLazy(){
    document.getElementById('listing').removeChild(document.getElementById('viewMore'));
    document.getElementById('nextPage').removeAttribute('class');
    
    lazy = document.getElementsByClassName('lazy');
    console.log('Found ' + lazy.length + ' lazy images');
} 

function lazyLoad(){
    for(var i=0; i<lazy.length; i++){
        if(isInViewport(lazy[i])){
            if (lazy[i].getAttribute('data-src')){
                lazy[i].src = lazy[i].getAttribute('data-src');
                lazy[i].removeAttribute('data-src');
            }
        }
    }
    
    cleanLazy();
}

function cleanLazy(){
    lazy = Array.prototype.filter.call(lazy, function(l){ return l.getAttribute('data-src');});
}

function isInViewport(el){
    var rect = el.getBoundingClientRect();
    
    return (
        rect.bottom >= 0 && 
        rect.right >= 0 && 
        rect.top <= (window.innerHeight || document.documentElement.clientHeight) && 
        rect.left <= (window.innerWidth || document.documentElement.clientWidth)
     );
}

function registerListener(event, func) {
    if (window.addEventListener) {
        window.addEventListener(event, func)
    } else {
        window.attachEvent('on' + event, func)
    }
}
</script>
</body>
</html>
              
            
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