Listen for change of class in jquery

Here are some other finds that might provide a solution:

1. Most efficient method of detecting/monitoring DOM changes?
2. How can I detect when an HTML element’s class changes?
3. Monitoring DOM Changes in JQuery

And as it was suggested in #2, why not make current a class that is added, rather than a ID, and have the following CSS handle the show/hide action.

<style type='text/css>
    .current{display:inline;}
    .notCurrent{display:none;}
</style>

Might also be worth it to look into .on() in jquery.

I know this is old, but the accepted answer uses DOMSubtreeModified, which has now been deprecated for the MutationObserver. Here's an example using jQuery (test it out here):

// Select the node that will be observed for mutations
let targetNode = $('#some-id');

// Options for the observer (which mutations to observe)
const config = { attributes: true, childList: false, subtree: false, attributeFilter: ['class'] };

// Callback function to execute when mutations are observed
const callback = function(mutationsList, observer) {
    for (let mutation of mutationsList) {
        if (mutation.attributeName === "class") {
            var classList = mutation.target.className;
            // Do something here with class you're expecting
            if(/red/.exec(classList).length > 0) {
                console.log('Found match');
            }
        }
    }
};

// Create an observer instance linked to the callback function
const observer = new MutationObserver(callback);

// Start observing the target node for configured mutations
observer.observe(targetNode[0], config);

// Later, you can stop observing
observer.disconnect();

You can bind the DOMSubtreeModified event. I add an example here:

$(document).ready(function() {
  $('#changeClass').click(function() {
    $('#mutable').addClass("red");
  });

  $('#mutable').bind('DOMSubtreeModified', function(e) {
    alert('class changed');
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="mutable" style="width:50px;height:50px;">sjdfhksfh
  <div>
    <div>
      <button id="changeClass">Change Class</button>
    </div>

http://jsfiddle.net/hnCxK/13/