I'm writing a shortcode to display responsive Bootstrap carousels that adjust column numbers according to browser width. It works for a single shortcode, and responsively adjusts as follows:

Responsive Boostrap carousel shortcode

However, I'm struggling to implement it so that it will work with multiple instances of the shortcode. I have prepared the shortcode so that it outputs a data-instance attribute that increments for every instance of it.

Here is the shortcode output without the js, which works but is not responsive:

<div id="features-carousel-11" class="carousel responsive posts-list slide light" data-instance="1" data-interval="4000" data-wrap="true" data-columns="3">

<h2 class="text-center title Responsive Features">Responsive Features</h2>

<div class="carousel-inner">

    <div class="item">              
        <div class="post-column col-xs-12 col-sm-4 col-lg-4"><div class="post-wrapper"><div class="post-image"><a href="/features/design/"><i class="fa fa-pencil" aria-hidden="true"></i></a></div><h3><a href="/features/design/">Design</a></h3>We theme the template to suit your needs. <br><div><a href="/wp-admin/post.php?post=313&amp;action=edit">(Edit)</a></div></div></div>
        <div class="post-column col-xs-12 col-sm-4 col-lg-4"><div class="post-wrapper"><div class="post-image"><a href="/features/search-engine-optimised/"><i class="fa fa-search" aria-hidden="true"></i></a></div><h3><a href="/features/search-engine-optimised/">Search Engine Optimised</a></h3>We structure and configure the site so people can find you. <br><div><a href="/wp-admin/post.php?post=314&amp;action=edit">(Edit)</a></div></div></div>
        <div class="post-column col-xs-12 col-sm-4 col-lg-4"><div class="post-wrapper"><div class="post-image"><a href="/features/edit-it-yourself/"><i class="fa fa-pencil-square-o" aria-hidden="true"></i></a></div><h3><a href="/features/edit-it-yourself/">Edit It Yourself</a></h3>You can edit the text and images yourself.<br><div><a href="/wp-admin/post.php?post=315&amp;action=edit">(Edit)</a></div></div></div>

    <div class="item active">
        <div class="post-column col-xs-12 col-sm-4 col-lg-4"><div class="post-wrapper"><div class="post-image"><a href="/features/social-media/"><i class="fa fa-facebook" aria-hidden="true"></i></a></div><h3><a href="/features/social-media/">Social Media</a></h3>Let your customers find you anywhere.&nbsp;<br><div><a href="/wp-admin/post.php?post=319&amp;action=edit">(Edit)</a></div></div></div>
        <div class="post-column col-xs-12 col-sm-4 col-lg-4"><div class="post-wrapper"><div class="post-image"><a href="/features/many-features/"><i class="fa fa-cogs" aria-hidden="true"></i></a></div><h3><a href="/features/many-features/">Many Features</a></h3>From testimonials to a multi-location map. <br><div><a href="/wp-admin/post.php?post=362&amp;action=edit">(Edit)</a></div></div></div>
        <div class="post-column col-xs-12 col-sm-4 col-lg-4"><div class="post-wrapper"><div class="post-image"><a href="/features/map/"><i class="fa fa-map-o" aria-hidden="true"></i></a></div><h3><a href="/features/map/">Map</a></h3>Featuring multiple locations, opening hours, &amp; directions.<br><div><a href="/wp-admin/post.php?post=370&amp;action=edit">(Edit)</a></div></div></div>


<ol class="carousel-indicators">
    <li data-target="#features-carousel-11" data-slide-to="0" class=""></li>
    <li data-target="#features-carousel-11" data-slide-to="1" class="active"></li>


<a class="btn btn-default" href="/features">View All</a><br><a class="btn btn-sm btn-default" href="/wp-admin/edit.php?post_type=features"><i class="fa fa-pencil"></i> Edit All</a>            

<a class="left carousel-control" href="#features-carousel-11" role="button" data-slide="prev">
    <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>

<a class="right carousel-control" href="#features-carousel-11" role="button" data-slide="next">
    <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
    <span class="sr-only">Next</span>

Here is the js file, modified from Eric Winton's solution, that works for a single instance of the shortcode:

jQuery(document).ready(function() {

jQuery(window).resize(function() {

  var browserWidth = jQuery(window).innerWidth();

  function resizeSlider(numColumns) {

    //Translate number of bootstrap columns
    if (numColumns == 6) {
      var bsColumn = "col-xs-2";
    } else if (numColumns == 5) {
      var bsColumn = "col-xs-5th";
    } else if (numColumns == 4) {
      var bsColumn = "col-xs-3";
    } else if (numColumns == 3) {
      var bsColumn = "col-xs-4";
    } else if (numColumns == 2) {
      var bsColumn = "col-xs-6";
    } else if (numColumns == 1) {
      var bsColumn = "col-xs-12";

    //Upwrap the slide images from their containing divs
    jQuery(".responsive .post-wrapper").unwrap().unwrap();

    //Wrap every card in the appropriate bootstrap column
    jQuery(".responsive .post-wrapper").wrap("<div class='" + bsColumn + " post-column'></div>");

    var slideWrappers = jQuery(".post-column");

    //Wrap every 3 cards in an item class, forming 1 whole slide
    for (var i = 0; i < slideWrappers.length; i += numColumns) {
      if (i == 0) {
        var activeItem = ' active';
      } else {
        var activeItem = '';

      slideWrappers.slice(i, i + numColumns).wrapAll("<div class='item" + activeItem + "'></div>");

    //Empty the control indicators and rebuild them based on new number of slides
    jQuery(".responsive .carousel-indicators").html("");

    var newNumberOfSlides = jQuery("#myCarousel .item").length;

    for (var s = 0; s < newNumberOfSlides; s++) {
      if (s == 0) {
        var activeClass = "class='active'";
      } else {
        var activeClass = "";

      jQuery(".responsive .carousel-indicators").append("<li data-target='#carousel' data-slide-to='" + s + "'" + activeClass + "></li>");


      var shortcodeColumns = parseInt(jQuery('.responsive.carousel').attr("data-columns"), 10);

      //if we're on a large desktop, organize the slides in 3 columns
      if (browserWidth > 1200) {
        //Large Tablet - 3 columns
      } else if ((browserWidth > 991) && (shortcodeColumns > 3)) {
        //Large Tablet - 3 columns
      } else if ((browserWidth > 767) && (shortcodeColumns > 2)) {
        //Small Tablet - 2 column
      } else {


How could I now make this work with multiple instances of the shortcode?

I've tried various methods suggested on looping through elements using data attributes ("data-instance", in the above case), but it seems to have difficulty with the js from the line on "var slideWrappers".

Thank you for your assistance.

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