MutationObserver

MutationObserverJS

/**
 * Supports IE9+, FF, Webkit
 * @param callback
 */
function watchElementState(callback) {
    var MutationObserver =
            window.MutationObserver || window.WebKitMutationObserver,
                eventListenerSupported = window.addEventListener;

    // callback.bind(this);
    // If you have multiple anonymous functions within your MutationObserver,
    // binding your scope to a variable is easier then continuously binding 
    // it to the functions
    var self = this;
    var node; // DOM Node
    if (MutationObserver) {
        var observer = new MutationObserver(function(mutations) {
            // your logic
            callback();
        });
        // https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
        observer.observe(node, {
            attributes: true,
            attributeOldValue: true,
        });
    } else if (eventListenerSupported) {
        var changeAdd = "<replaceMe>Added",
            changeRemove = "<replaceMe>Removed";
        element.addEventListener(changeAdd, callback, false);
        element.addEventListener(changeRemove, callback, false);
    }
}