Is there a JavaScript / jQuery DOM change listener?

For a long time, DOM3 mutation events were the best available solution, but they have been deprecated for performance reasons. DOM4 Mutation Observers are the replacement for deprecated DOM3 mutation events. They are currently implemented in modern browsers as MutationObserver (or as the vendor-prefixed WebKitMutationObserver in old versions of Chrome):

MutationObserver = window.MutationObserver || window.WebKitMutationObserver;

var observer = new MutationObserver(function(mutations, observer) {
    // fired when a mutation occurs
    console.log(mutations, observer);
    // ...
});

// define what element should be observed by the observer
// and what types of mutations trigger the callback
observer.observe(document, {
  subtree: true,
  attributes: true
  //...
});

This example listens for DOM changes on document and its entire subtree, and it will fire on changes to element attributes as well as structural changes. The draft spec has a full list of valid mutation listener properties:

childList

Set to true if mutations to target's children are to be observed.

attributes

Set to true if mutations to target's attributes are to be observed.

characterData

Set to true if mutations to target's data are to be observed.

subtree

Set to true if mutations to not just target, but also target's descendants are to be observed.

attributeOldValue

Set to true if attributes is set to true and target's attribute value before the mutation needs to be recorded.

characterDataOldValue

Set to true if characterData is set to true and target's data before the mutation needs to be recorded.

attributeFilter

Set to a list of attribute local names (without namespace) if not all attribute mutations need to be observed.

(This list is current as of April 2014; you may check the specification for any changes.)

Edit

This answer is now deprecated. See the answer by apsillers.

Since this is for a Chrome extension, you might as well use the standard DOM event - DOMSubtreeModified. See the support for this event across browsers. It has been supported in Chrome since 1.0.

$("#someDiv").bind("DOMSubtreeModified", function() {
    alert("tree changed");
});

See a working example here.

Many sites use AJAX/XHR/fetch to add, show, modify content dynamically and window.history API instead of in-site navigation so current URL is changed programmatically. Such sites are called SPA, short for Single Page Application.

Usual JS methods of detecting page changes

MutationObserver (docs) to literally detect DOM changes:

How to change the HTML content as it's loading on the page
Performance of MutationObserver to detect nodes in entire DOM.

Simple example:

let lastUrl = location.href; 
new MutationObserver(() => {
  const url = location.href;
  if (url !== lastUrl) {
    lastUrl = url;
    onUrlChange();
  }
}).observe(document, {subtree: true, childList: true});

function onUrlChange() {
  console.log('URL changed!', location.href);
}

Event listener for sites that signal content change by sending a DOM event:
- pjax:end on document used by many pjax-based sites e.g. GitHub,
  see How to run jQuery before and after a pjax load?
- message on window used by e.g. Google search in Chrome browser,
  see Chrome extension detect Google search refresh
- yt-navigate-finish used by Youtube,
  see How to detect page navigation on YouTube and modify its appearance seamlessly?
Periodic checking of DOM via setInterval:
Obviously this will work only in cases when you wait for a specific element identified by its id/selector to appear, and it won't let you universally detect new dynamically added content unless you invent some kind of fingerprinting the existing contents.

Cloaking History API:

let _pushState = History.prototype.pushState;
History.prototype.pushState = function (state, title, url) {
  _pushState.call(this, state, title, url);
  console.log('URL changed', url)
};

Listening to hashchange, popstate events:

window.addEventListener('hashchange', e => {
  console.log('URL hash changed', e);
  doSomething();
});
window.addEventListener('popstate', e => {
  console.log('State changed', e);
  doSomething();
});

P.S. All these methods can be used in a WebExtension's content script. It's because the case we're looking at is where the URL was changed via history.pushState or replaceState so the page itself remained the same with the same content script environment.

Another approach depending on how you are changing the div. If you are using JQuery to change a div's contents with its html() method, you can extend that method and call a registration function each time you put html into a div.

(function( $, oldHtmlMethod ){
    // Override the core html method in the jQuery object.
    $.fn.html = function(){
        // Execute the original HTML method using the
        // augmented arguments collection.

        var results = oldHtmlMethod.apply( this, arguments );
        com.invisibility.elements.findAndRegisterElements(this);
        return results;

    };
})( jQuery, jQuery.fn.html );

We just intercept the calls to html(), call a registration function with this, which in the context refers to the target element getting new content, then we pass on the call to the original jquery.html() function. Remember to return the results of the original html() method, because JQuery expects it for method chaining.

For more info on method overriding and extension, check out http://www.bennadel.com/blog/2009-Using-Self-Executing-Function-Arguments-To-Override-Core-jQuery-Methods.htm, which is where I cribbed the closure function. Also check out the plugins tutorial at JQuery's site.

Is there a JavaScript / jQuery DOM change listener?

Usual JS methods of detecting page changes

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