Slide Recommended Widget With Random Posts Blogger

This widget will open (slide) on the blog when posting page-scroll or rolled up and hidden back by pressing the close button. Please see the demo on the link below.
Demo on Blog
Demo on Friddle
To try it out, please copy the code below.

Add CSS

.slidebox {
    position:fixed;
    bottom:100px;
    right:-300px;
    width:290px;
    height:150px;
    font-size:30px;
    color:white;
    background:#333;
    transition:all .4s ease-in-out;
    padding-right:10px;
    border-radius:3px 0 0 3px;
}
.header-slidebox{
    position:absolute;
    top:0;
    left:0;
    text-align:left;
    font-family:Arial;
    font-size:18px;
    font-weight:400;
    background:#505050;
    border-bottom:1px solid #282828;
    padding:0 10px;
    height:30px;
    width:100%;
    line-height:30px;
    border-radius:3px 0 0;
}
.closeslidebox{
    color:#333;
    position:absolute;
    top:0px;
    right:0px;
    font-family:Arial;
    font-size:18px;
    font-weight:700;
    cursor:pointer;
    background:#ddd;
    text-align:center;
    width:30px;
    height:30px;
    line-height:30px;
    border-bottom:1px solid #282828;
    transition:all .3s ease-in-out;
}
.closeslidebox:hover{
    background:#cacaca;
}
#random-posts img{
    float:left;
    margin:0 10px 10px 0;
    background:#FFF;
    width:130px;
    height:100px;
    padding:0;
    transition:all .3s ease-in-out;
    border-radius:3px;
}
#random-posts img:hover{
    opacity:.7;
}
ul#random-posts{
    list-style:none;
    margin-top:40px;
    margin-left:-30px;
    font-family:Arial;
    font-size:16px;
    line-height:1.2em;
}
ul#random-posts li a{
    color:#eee;
    text-decoration:none;
}
.readmorerandom a{
    position:absolute;
    bottom:0;
    right:0;
    font-family:Arial;
    font-size:14px;
    font-weight:400;
    background:#505050;
    text-align:center;
    display:block;
    padding:2px 8px;
    transition:all .3s ease-in-out;
    color:#eee!important;
    border-radius:3px 0 0
}
.readmorerandom:hover a{
    color:#333!important;
    background:#cacaca;
}

HTML and JavaScript code

Please keep the following code above the </body>

<b:if cond='data:blog.pageType == &quot;item&quot;'>
<div class='slidebox'>
  <div class='header-slidebox'>Recommended For You</div>
<ul id='random-posts'>
<script type='text/javascript'>
//<![CDATA[
var rdp_numposts=1;
var rdp_snippet_length=100;
var rdp_info='no';
var rdp_comment='Comment';
var rdp_disable='';
var rdp_current=[];var rdp_total_posts=0;var rdp_current=new Array(rdp_numposts);function totalposts(json){rdp_total_posts=json.feed.openSearch$totalResults.$t}document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&max-results=0&callback=totalposts\"><\/script>');function getvalue(){for(var i=0;i<rdp_numposts;i++){var found=false;var rndValue=get_random();for(var j=0;j<rdp_current.length;j++){if(rdp_current[j]==rndValue){found=true;break}};if(found){i--}else{rdp_current[i]=rndValue}}};function get_random(){var ranNum=1+Math.round(Math.random()*(rdp_total_posts-1));return ranNum};
//]]>
</script>
<script type='text/javascript'>
//<![CDATA[
    function random_posts(json){a=location.href;y=a.indexOf('?m=0');for(var i=0;i<rdp_numposts;i++){var entry=json.feed.entry[i];var rdp_posttitle=entry.title.$t;if('content'in entry){var rdp_get_snippet=entry.content.$t}else{if('summary'in entry){var rdp_get_snippet=entry.summary.$t}else{var rdp_get_snippet="";}};rdp_get_snippet=rdp_get_snippet.replace(/<[^>]*>/g,"");if(rdp_get_snippet.length<rdp_snippet_length){var rdp_snippet=rdp_get_snippet}else{rdp_get_snippet=rdp_get_snippet.substring(0,rdp_snippet_length);var space=rdp_get_snippet.lastIndexOf(" ");rdp_snippet=rdp_get_snippet.substring(0,space)+"&#133;";};for(var j=0;j<entry.link.length;j++){if('thr$total'in entry){var rdp_commentsNum=entry.thr$total.$t+' '+rdp_comment}else{rdp_commentsNum=rdp_disable};if(entry.link[j].rel=='alternate'){var rdp_posturl=entry.link[j].href;if(y!=-1){rdp_posturl=rdp_posturl+'?m=0'}var rdp_postdate=entry.published.$t;if('media$thumbnail'in entry){var rdp_thumb=entry.media$thumbnail.url}else{rdp_thumb="https://lh5.googleusercontent.com/-hxY0rTdcuyM/UfUyPpaoBKI/AAAAAAAACsQ/vFtqfUwj074/s72-no/no-image.PNG"}}};document.write('<li>');document.write('<a href="'+rdp_posturl+'" rel="nofollow" title="'+rdp_posttitle+'"><img alt="'+rdp_posttitle+'" title="'+rdp_posttitle+'" src="'+rdp_thumb+'"/></a>');document.write('<div><a href="'+rdp_posturl+'" rel="nofollow" title="'+rdp_posttitle+'">'+rdp_posttitle+'</a></div>');document.write('<div class="readmorerandom"><a href="'+rdp_posturl+'" rel="nofollow" title="Read More">Read More</a></div>');if(rdp_info=='yes'){document.write('<span>'+rdp_postdate.substring(8,10)+'/'+rdp_postdate.substring(5,7)+'/'+rdp_postdate.substring(0,4)+' - '+rdp_commentsNum)+'</span>'}document.write('<div style="clear:both"></div></li>')}};getvalue();for(var i=0;i<rdp_numposts;i++){document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&start-index='+rdp_current[i]+'&max-results=1&callback=random_posts\"><\/script>')};
//]]>
</script>
</ul>
    <div class='closeslidebox'>&#215;</div>
</div>
<script type='text/javascript'>
//<![CDATA[
$(window).load(function(){
$(window).scroll(function(){
    if ($(this).scrollTop() > 400) {
       $('.slidebox').stop().animate({ right: '0px' });
    }
});
$(function() {
    $('.closeslidebox').click(function () {
    $('.slidebox').css({right:'-300px'});
    $('.slidebox').fadeOut();
});
     });
});
//]]>
</script>
</b:if>

The widget will appear when the blog page scrolled, and once closed by clicking the close button then this widget will not appear again even if the page is rolled repeatedly
If you want widgets can come out again when the page is scrolled again after close button is clicked, please delete the following code in the code set javascript bottom.

$('.slidebox').fadeOut();

http://www.kompiajaib.com/2014/08/slide-recommended-widget-with-random.html