autopagerize_for_haiku.user.js

// ==UserScript==
// @name           Autopagerize for haiku
// @namespace      http://rails2u.com/
// @description    works on Firefox, Opera, Safari and fub.net
// @include        http://h.hatena.ne.jp/*
// @include        http://h.hatena.com/*
// ==/UserScript==

(function(unsafeWindow){
	var getHeight = (function(){
		if (window.scrollMaxY) {
			return function(){return window.scrollMaxY;}
		} else {
			return function(){return document.documentElement.scrollHeight - document.documentElement.clientHeight;}
		}
	})();
	var getScroll = (function(){
		if (!isNaN(window.pageYOffset-0)) {
			return function(){return window.pageYOffset;}
		} else {
			return function(){return document.documentElement.scrollTop;}
		}
	})();
	var addEvent = (function(){
		if (unsafeWindow.addEventListener) {
			return function(e,t,f,c){
				e.addEventListener(t,f,c);
			}
		} else if (unsafeWindow.attachEvent) {
			return function(e,t,f,c){
				e.attachEvent('on'+t,f);
			}
		}
	})();

	var THRESHOLD = 800;
	var Pager = unsafeWindow.Hatena.Haiku.Pager;
	var Ten = unsafeWindow.Ten;

	var enable    = true;
	var appending = false;

	setTimeout(function(){
		Pager["addEventListener"]('loadedEntries', function() {  appending = false;});
	},100);

	addEvent(window,'scroll', function(ev) {
		if (!enable || appending) return;

		if ((getHeight() - getScroll()) < THRESHOLD) {
			appending = true;
			var anchor = Ten.Selector.getElementsBySelector('div.pager:first-child > a:first-child')[0];
			if (document.createEvent) {
				var mEv = document.createEvent('MouseEvents');
				mEv.initEvent('click',true,true);
				anchor.dispatchEvent(mEv);
			} else if (document.createEventObject) {
				var mEv = document.createEventObject();
				mEv.target=anchor;
				anchor.fireEvent("onclick",mEv);
			}
		}
	}, false);

	addEvent(window,'dblclick', function(ev) {
		enable = !enable;
	}, false);

})(this.unsafeWindow || window.unsafeWindow || window);

MEMO.txt

window.scrollMaxY は Firefox Only 、Firefox以外は、document.documentElement.scrollHeight - document.documentElement.clientHeight

window.pageYOffset は Firefox,Opera,Safari 、IEのみdocument.documentElement.scrollTop

IE以外は addEventListener 、IEは attachEvent 

<del>なぜか、Pager.addEventListener('loadedEntries', function() {  appending = false;});がfub.netでこけるので、仕方なく_eventListenersに直接push。fub.netかどうかはwindowにunsafeWindowを持っているかどうかで判定。</del>
<ins>fub先生にaddEventListenerって文字列が使えない理由( http://twitter.com/fub/statuses/868066190 )を教えてもらって、["addEventListener"](..に変更。</ins>

IE以外はcreateEvent & dispatchEventで、IEのみcreateEventObject & fireEvent