rx-winjs/src/mutationobserver.js

Library for composing asynchronous and event-based operations in JavaScript extending the Windows WinJS library

    if (window.MutationObserver) {

        /**
         * Creates an observable sequence from a Mutation Observer.
         * MutationObserver provides developers a way to react to changes in a DOM.
         * @example
         *  Rx.DOM.fromMutationObserver(document.getElementById('foo'), { attributes: true, childList: true, characterData: true });
         *
         * @param {Object} target The Node on which to obserave DOM mutations.
         * @param {Object} options A MutationObserverInit object, specifies which DOM mutations should be reported.
         * @returns {Observable} An observable sequence which contains mutations on the given DOM target.
         */
        Rx.WinJS.fromMutationObserver = function (target, options) {

            return observableCreate(function (observer) {
                var mutationObserver = new MutationObserver(function (mutations) {
                    observer.onNext(mutations);
                });

                mutationObserver.observe(target, options);

                return function () {
                    mutationObserver.disconnect();
                };
            });

        };

    }