Continuously scrolls to the bottom of a web page. Great for infinite scroll pages such as Facebook and Pinterest.

WebDig.js

// call this when you are done digging
var stopDigging;

(function () {
    var dig = true, tryScroll, observer;
        
    // create an observer instance
    observer = new MutationObserver(function(mutations) {
        mutations.forEach(function(mutation) {
            tryScroll();
        });    
    });

    // if dig is enabled and the page is not currently scrolled to the bottom
    tryScroll = function() {
        if ((document.body.scrollTop < document.body.scrollHeight) && dig) {
            window.scrollTo(0,document.body.scrollHeight);
        } 
    }

    // pass in the target node, as well as the observer options
    observer.observe(document.body, {attributes: true, childList: true, characterData: true, subtree: true });

    // toggle dig flag to stop scrolling
    stopDigging = function() {
        dig = false;
        observer.disconnect();
        console.warn('Digging stopped');
    }

    tryScroll();
})();