“Working” script returning Uncaught DOMException:

I'm building a page that first gets the HTML data from an external page (Not cross domain), then after the first function completes, it runs a function which is a sideshow. It works... More or less...

The problem that I'm having is that after 5 or 6 slides, the whole thing gets messy and then everything disappears. When checking the console, I found the following message:

Uncaught DOMException: Failed to execute 'insertBefore' on 'Node': The new child element contains the parent.
    at HTMLDivElement.<anonymous> (xxxxxxxxxxxxxxxxx.com/jquery/jquery-1.12.4.js:6297:21)
    at domManip (xxxxxxxxxxxxxxxxx.com/jquery/jquery-1.12.4.js:6066:14)
    at jQuery.fn.init.after (xxxxxxxxxxxxxxxxx/jquery/jquery-1.12.4.js:6295:10)
    at HTMLDivElement.<anonymous> (xxxxxxxxxxxxxxxxx.com/go/scripts/jqueryautoscroll/autoscroll.js:41:47)
    at HTMLDivElement.opt.complete (xxxxxxxxxxxxxxxxx/jquery/jquery-1.12.4.js:7900:12)
    at fire (xxxxxxxxxxxxxxxxx.com/jquery/jquery-1.12.4.js:3232:31)
    at Object.fireWith [as resolveWith] (xxxxxxxxxxxxxxxxx/jquery/jquery-1.12.4.js:3362:7)
    at tick (xxxxxxxxxxxxxxxxx.com/jquery/jquery-1.12.4.js:7755:14)
    at jQuery.fx.tick (xxxxxxxxxxxxxxxxx.com/jquery/jquery-1.12.4.js:8069:9)

I presume it has something to do with the container.find(elm + ':first').before(container.find(elm + ':last')); So I tried commenting all the lines, the error was gone, but then the sliders wouldn't change.

My code is as follows:

jQuery(document).ready(function ($) {

$("#jobshome").load("jobs/newest-jobs .js-toprow", function(){
    //rotation speed and timer
    var speed = 3000;
    var run = setInterval(rotate, speed);
    var slides = $('.js-toprow');
    var container = $('#jobshome');
    var elm = container.find(':first-child').prop("tagName");
    var item_height = container.height();
    var previous = 'prevabc'; //id of previous button
    var next = 'nextabc'; //id of next button
    slides.height(item_height); //set the slides to the correct pixel height
    container.parent().height(item_height);
    container.height(slides.length * item_height); //set the slides container to the correct total height
    container.find(elm + ':first').before(container.find(elm + ':last'));
    resetSlides(); 


    //if user clicked on prev button

    $('#buttonsabc a').click(function (e) {
        //slide the item

        if (container.is(':animated')) {
            return false;
        }
        if (e.target.id == previous) {
            container.stop().animate({
                'top': 0
            }, 1500, function () {
                container.find(elm + ':first').before(container.find(elm + ':last'));
                resetSlides();
            });
        }

        if (e.target.id == next) {
            container.stop().animate({
                'top': item_height * -2
            }, 1500, function () {
                container.find(elm + ':last').after(container.find(elm + ':first'));
                resetSlides();
            }
      );
    }
        //cancel the link behavior            
        return false;

    });

    //if mouse hover, pause the auto rotation, otherwise rotate it    
    container.parent().mouseenter(function () {
        clearInterval(run);
    }).mouseleave(function () {
        run = setInterval(rotate, speed);
    });


    function resetSlides() {
        //and adjust the container so current is in the frame
        container.css({
            'top': -1 * item_height
        });
    }

});
//a simple function to click next link
//a timer will call this function, and the rotation will begin

function rotate() {
    jQuery('#nextabc').click();
}

});

#carouselabc {
  position: relative;
  width: 60%;
  margin: 0 auto;
}

#slidesabc {
  overflow: hidden;
  position: relative;
  width: 100%;
  height: 250px;
}

#areadoslideabc {
  list-style: none;
  width: 100%;
  height: 250px;
  margin: 0;
  padding: 0;
  position: relative;
}

#slidesabcdef {
  width: 100%;
  height: 250px;
  float: left;
  text-align: center;
  position: relative;
  font-family: lato, sans-serif;
}


/* Styling for prev and next buttons */

.btn-barabc {
  max-width: 346px;
  margin: 0 auto;
  display: block;
  position: relative;
  top: 40px;
  width: 100%;
}

#buttonsabc {
  padding: 0 0 5px 0;
  float: right;
}

#buttonsabc a {
  text-align: center;
  display: block;
  font-size: 50px;
  float: left;
  outline: 0;
  margin: 0 60px;
  color: #b14943;
  text-decoration: none;
  display: block;
  padding: 9px;
  width: 35px;
}

a#prevabc:hover,
a#next:hover {
  color: #FFF;
  text-shadow: .5px 0px #b14943;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="carouselabc">
  <div class="btn-barabc">
    <div id="buttonsabc">
      <a id="prevabc" href="#">Previous</a>
      <a id="nextabc" href="#">Next</a>
    </div>
  </div>
  <div id="slidesabc">
    <div id="jobshome"></div>
  </div>
</div>

Screenshot 1

Screenshot 2

This is how it starts

Your problem seems to happen because of the nested selectors (.js-toprow) that are later moved.

Try replacing all the .find() (matches children any level deep) with .children() (matches only immediate children).

jQuery(document).ready(function ($) {
$("#jobshome").load("jobs/newest-jobs .js-toprow", function(){
    //rotation speed and timer
    var speed = 3000;
    var run = setInterval(rotate, speed);
    var slides = $('.js-toprow');
    var container = $('#jobshome');
    var elm = container.children(':first-child').prop("tagName");
    var item_height = container.height();
    var previous = 'prevabc'; //id of previous button
    var next = 'nextabc'; //id of next button
    slides.height(item_height); //set the slides to the correct pixel height
    container.parent().height(item_height);
    container.height(slides.length * item_height); //set the slides container to the correct total height
    container.children(elm + ':first').before(container.children(elm + ':last'));
    resetSlides(); 


    //if user clicked on prev button

    $('#buttonsabc a').click(function (e) {
        //slide the item

        if (container.is(':animated')) {
            return false;
        }
        if (e.target.id == previous) {
            container.stop().animate({
                'top': 0
            }, 1500, function () {
                container.children(elm + ':first').before(container.children(elm + ':last'));
                resetSlides();
            });
        }

        if (e.target.id == next) {
            container.stop().animate({
                'top': item_height * -2
            }, 1500, function () {
                container.children(elm + ':last').after(container.children(elm + ':first'));
                resetSlides();
            }
      );
    }
        //cancel the link behavior            
        return false;

    });

    //if mouse hover, pause the auto rotation, otherwise rotate it    
    container.parent().mouseenter(function () {
        clearInterval(run);
    }).mouseleave(function () {
        run = setInterval(rotate, speed);
    });


    function resetSlides() {
        //and adjust the container so current is in the frame
        container.css({
            'top': -1 * item_height
        });
    }

});
//a simple function to click next link
//a timer will call this function, and the rotation will begin

function rotate() {
    jQuery('#nextabc').click();
}

});