Load next notes on tumblr

showmorenotes.user.js

// ==UserScript==
// @name           Show more notes
// @namespace      http://nkmrgk.tumblr.com/
// @description    Load next notes on tumblr
// @include        http://*.tumblr.com/post/*
// ==/UserScript==
(function() {
    var is_in_view = function(elem) {
        // ref: http://d.hatena.ne.jp/edvakf/20100205/1265338487
        var rect = elem.getBoundingClientRect();
        if (rect.left < 0 || rect.left > window.innerWidth ||
            rect.top < 0 || rect.top > window.innerHeight) {
            return false;
        }
        return elem === document.elementFromPoint(rect.left, rect.top);
    };
    
    window.addEventListener('scroll', function() {
        var button = document.querySelector('.more_notes_link');
        if (is_in_view(button)) {
            var event = document.createEvent('MouseEvents');
            event.initMouseEvent('click',true,true,window,0,0,0,0,0,false,false,false,false,0,null);
            button.dispatchEvent(event);
        }
    }, false);
}());