tumblr infinite scroll

autopager.js

/**
A slight variant of http://rocketshake.tumblr.com/post/424849450/infinite-scroll
This file has been uploaded to http://static.tumblr.com/fpifyru/F4wm4bbxj/autopager.js
**/

var tumblrAutoPager = {
    url: "http://proto.jp/",
	ver: "0.1.7",
	rF: true,
	gP: {},
	pp: null,
	ppId: "",
	LN: location.hostname,
	init: function () {
		if ($("autopagerize_icon") || navigator.userAgent.indexOf('iPhone') != -1) return;
		var tAP = tumblrAutoPager;
		var p = 1;
		var lh = location.href;
		var lhp = lh.lastIndexOf("/page/");
		var lht = lh.lastIndexOf("/tagged/");
		if (lhp != -1) {
			p = parseInt(lh.slice(lhp + 6));
			tAP.LN = lh.slice(7, lhp);
		} else if (lht != -1) {
			tAP.LN = lh.slice(7);
			if (tAP.LN.slice(tAP.LN.length - 1) == "/") tAP.LN = tAP.LN.slice(0, tAP.LN.length - 1);
		} else if ("http://" + tAP.LN + "/" != lh) {
			return;
		};
		var gPFncs = [];
		gPFncs[0] = function (aE) {
			var r = [];
			for (var i = 0, l = aE.length; i < l; i++) {
				if (aE[i].className == "autopagerize_page_element") {
					r = gCE(aE[i]);
					break;
				}
			}
			return r;
		};
		gPFncs[1] = function (aE) {
			var r = [];
			for (var i = 0, l = aE.length; i < l; i++) {
				var arr = aE[i].className ? aE[i].className.split(" ") : null;
				if (arr) {
					for (var j = 0; j < arr.length; j++) {
						arr[j] == "post" ? r.push(aE[i]) : null;
					}
				}
			}
			return r;
		};
		gPFncs[2] = function (aE) {
			var r = [];
			var tmpId = tAP.ppId ? [tAP.ppId] : ["posts", "main", "container", "content", "apDiv2", "wrapper", "projects"];
			for (var i = 0, l = aE.length; i < l; i++) {
				for (var j = 0; j < tmpId.length; j++) {
					if (aE[i].id == tmpId[j]) {
						r = gCE(aE[i]);
						tAP.ppId = aE[i].id;
						break;
					}
				}
			}
			return r;
		};
		for (var i = 0; i < gPFncs.length; i++) {
			var getElems = gPFncs[i](document.body.getElementsByTagName('*'));
			if (getElems.length) {
				tAP.gP = gPFncs[i];
				tAP.pp = getElems[0].parentNode;
				break;
			}
		}
		function gCE(pElem) {
			var r = [];
			for (var i = 0, l = pElem.childNodes.length; i < l; i++) {
				r.push(pElem.childNodes.item(i))
			}
			return r;
		}
		if (!tAP.pp) {
			return;
		}
		sendRequest.README = {
			license: 'Public Domain',
			url: 'http://jsgt.org/lib/ajax/ref.htm',
			version: 0.516,
			author: 'Toshiro Takahashi'
		};

		function chkAjaBrowser() {
			var A, B = navigator.userAgent;
			this.bw = {
				safari: ((A = B.split('AppleWebKit/')[1]) ? A.split('(')[0].split('.')[0] : 0) >= 124,
				konqueror: ((A = B.split('Konqueror/')[1]) ? A.split(';')[0] : 0) >= 3.3,
				mozes: ((A = B.split('Gecko/')[1]) ? A.split(' ')[0] : 0) >= 20011128,
				opera: ( !! window.opera) && ((typeof XMLHttpRequest) == 'function'),
				msie: ( !! window.ActiveXObject) ? ( !! createHttpRequest()) : false
			};
			return (this.bw.safari || this.bw.konqueror || this.bw.mozes || this.bw.opera || this.bw.msie)
		}
		function createHttpRequest() {
			if (window.XMLHttpRequest) {
				return new XMLHttpRequest()
			} else {
				if (window.ActiveXObject) {
					try {
						return new ActiveXObject('Msxml2.XMLHTTP')
					} catch (B) {
						try {
							return new ActiveXObject('Microsoft.XMLHTTP')
						} catch (A) {
							return null
						}
					}
				} else {
					return null
				}
			}
		};

		function sendRequest(E, R, C, D, F, G, S, A) {
			var Q = C.toUpperCase() == 'GET',
				H = createHttpRequest();
			if (H == null) {
				return null
			}
			if ((G) ? G : false) {
				D += ((D.indexOf('?') == -1) ? '?' : '&') + 't=' + (new Date()).getTime()
			}
			var P = new chkAjaBrowser(),
				L = P.bw.opera,
				I = P.bw.safari,
				N = P.bw.konqueror,
				M = P.bw.mozes;
			if (typeof E == 'object') {
				var J = E.onload;
				var O = E.onbeforsetheader
			} else {
				var J = E;
				var O = null
			}
			if (L || I || M) {
				H.onload = function () {
					J(H);
					H.abort()
				}
			} else {
				H.onreadystatechange = function () {
					if (H.readyState == 4) {
						J(H);
						H.abort()
					}
				}
			}
			R = K(R, D);
			if (Q) {
				D += ((D.indexOf('?') == -1) ? '?' : (R == '') ? '' : '&') + R
			}
			H.open(C, D, F, S, A);
			if ( !! O) {
				O(H)
			}
			B(H);
			H.send(R);

			function B(T) {
				if (!L || typeof T.setRequestHeader == 'function') {
					T.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8')
				}
				return T
			}
			function K(X, V) {
				var Z = [];
				if (typeof X == 'object') {
					for (var W in X) {
						Y(W, X[W])
					}
				} else {
					if (typeof X == 'string') {
						if (X == '') {
							return ''
						}
						if (X.charAt(0) == '&') {
							X = X.substring(1, X.length)
						}
						var T = X.split('&');
						for (var W = 0; W < T.length; W++) {
							var U = T[W].split('=');
							Y(U[0], U[1])
						}
					}
				}
				function Y(b, a) {
					Z.push(encodeURIComponent(b) + '=' + encodeURIComponent(a))
				}
				return Z.join('&')
			}
			return H
		}
		function addNextPage(oj) {
			if (oj.status == 404) {
				tAP.remainFlg = false;
				return;
			}
			var d = document.createElement("div");
			d.innerHTML = oj.responseText;
			var posts = tAP.gP(d.getElementsByTagName("*"));
			if (posts.length < 2) {
				tAP.rF = false;
				return;
			}
			/*var hr = document.createElement("hr");
			hr.className = "tumblrAutoPager_page_separator";
			tAP.pp.appendChild(hr);*/
			d = document.createElement("div");
			d.className = "tumblrAutoPager_page_info";
			d.innerHTML = "<h2><a href=http://" + tAP.LN + "/page/" + p + ">Page " + p + "</a></h2>";
			tAP.pp.appendChild(d);
			for (var i = 0; i < posts.length; i++) {
				tAP.pp.appendChild(posts[i]);
			}
			var footer = $("footer");
			footer ? footer.parentNode.appendChild(footer) : null;
			tAP.rF = true;
		}
		watch_scroll();

		function watch_scroll() {
			var d = document.compatMode == "BackCompat" ? document.body : document.documentElement;
			var r = d.scrollHeight - d.clientHeight - (d.scrollTop || document.body.scrollTop);
			if (r < d.clientHeight * 2 && tAP.rF) {
				tAP.rF = false;
				p++;
				sendRequest(addNextPage, "", "GET", "http://" + tAP.LN + "/page/" + p, true);
			}
			setTimeout(arguments.callee, 200);
		};

		function $(id) {
			return document.getElementById(id)
		};
	},
	switchAutoPage: function () {
		this.rF = !this.rF;
		var aE = document.getElementsByTagName('*');
		for (var i = 0, l = aE.length; i < l; i++) {
			if (aE[i].className == "tAP_switch") {
				aE[i].firstChild.nodeValue = this.rF ? "AutoPage[OFF]" : "AutoPage[ON]";
			}
		}
	}
};
window.addEventListener ? window.addEventListener('load', tumblrAutoPager.init, false) : window.attachEvent ? window.attachEvent("onload", tumblrAutoPager.init) : window.onload = tumblrAutoPager.init;