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Commit d77982b9 authored by Craig Andrews's avatar Craig Andrews

added Infinite Scroll plugin

parent 83ff1cec
* Laconica, the distributed open-source microblogging tool
* Plugin to enable Infinite Scrolling
* PHP version 5
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* @category Plugin
* @package Laconica
* @author Craig Andrews <candrews@integralblue.com>
* @copyright 2009 Craig Andrews http://candrews.integralblue.com
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
if (!defined('LACONICA')) {
class InfiniteScrollPlugin extends Plugin
function __construct()
function onEndShowScripts($action)
array('type' => 'text/javascript',
'src' => common_path('plugins/InfiniteScroll/jquery.infinitescroll.min.js')),
$loading_image = common_path('plugins/InfiniteScroll/ajax-loader.gif');
$js_string = <<<EOT
<script type="text/javascript">
nextSelector : "li.nav_next a",
loadingImg : "$loading_image",
text : "<em>Loading the next set of posts...</em>",
donetext : "<em>Congratulations, you\'ve reached the end of the Internet.</em>",
navSelector : "div.pagination",
contentSelector : "#notices_primary",
itemSelector : "ol.notices"
// Infinite Scroll jQuery plugin
// copyright Paul Irish, licensed GPL & MIT
// version 1.2.090804
// home and docs: http://www.infinite-scroll.com
// todo: add preloading option.
$.fn.infinitescroll = function(options,callback){
// console log wrapper.
function debug(){
if (opts.debug) { window.console && console.log.call(console,arguments)}
// grab each selector option and see if any fail.
function areSelectorsValid(opts){
for (var key in opts){
if (key.indexOf && key.indexOf('Selector') && $(opts[key]).length === 0){
debug('Your ' + key + ' found no elements.');
return false;
return true;
// find the number to increment in the path.
function determinePath(path){
path.match(relurl) ? path.match(relurl)[2] : path;
// there is a 2 in the url surrounded by slashes, e.g. /page/2/
if ( path.match(/^(.*?)\b2\b(.*?$)/) ){
path = path.match(/^(.*?)\b2\b(.*?$)/).slice(1);
} else
// if there is any 2 in the url at all.
if (path.match(/^(.*?)2(.*?$)/)){
debug('Trying backup next selector parse technique. Treacherous waters here, matey.');
path = path.match(/^(.*?)2(.*?$)/).slice(1);
} else {
debug('Sorry, we couldn\'t parse your Next (Previous Posts) URL. Verify your the css selector points to the correct A tag. If you still get this error: yell, scream, and kindly ask for help at infinite-scroll.com.');
props.isInvalidPage = true; //prevent it from running on this page.
return path;
// 'document' means the full document usually, but sometimes the content of the overflow'd div in local mode
function getDocumentHeight(){
// weird doubletouch of scrollheight because http://soulpass.com/2006/07/24/ie-and-scrollheight/
return opts.localMode ? ($(props.container)[0].scrollHeight && $(props.container)[0].scrollHeight)
// needs to be document's height. (not props.container's) html's height is wrong in IE.
: $(document).height()
function isNearBottom(opts,props){
// distance remaining in the scroll
// computed as: document height - distance already scroll - viewport height - buffer
var pixelsFromWindowBottomToBottom = getDocumentHeight() -
(opts.localMode ? $(props.container).scrollTop() :
// have to do this bs because safari doesnt report a scrollTop on the html element
($(props.container).scrollTop() || $(props.container.ownerDocument.body).scrollTop())) -
$(opts.localMode ? props.container : window).height();
debug('math:',pixelsFromWindowBottomToBottom, props.pixelsFromNavToBottom);
// if distance remaining in the scroll (including buffer) is less than the orignal nav to bottom....
return (pixelsFromWindowBottomToBottom - opts.bufferPx < props.pixelsFromNavToBottom);
function showDoneMsg(){
.find('div').html(opts.donetext).animate({opacity: 1},2000).fadeOut('normal');
// user provided callback when done
function infscrSetup(path,opts,props,callback){
if (props.isDuringAjax || props.isInvalidPage || props.isDone) return;
if ( !isNearBottom(opts,props) ) return;
// we dont want to fire the ajax multiple times
props.isDuringAjax = true;
// show the loading message and hide the previous/next links
props.loadingMsg.appendTo( opts.contentSelector ).show();
$( opts.navSelector ).hide();
// increment the URL bit. e.g. /page/3/
debug('heading into ajax',path);
// if we're dealing with a table we can't use DIVs
var box = $(opts.contentSelector).is('table') ? $('<tbody/>') : $('<div/>');
.appendTo( opts.contentSelector )
.load( path.join( props.currPage ) + ' ' + opts.itemSelector,null,function(){
// if we've hit the last page...
if (props.isDone){
return false;
} else {
// if it didn't return anything
if (box.children().length == 0){
// fake an ajaxError so we can quit.
$.event.trigger( "ajaxError", [{status:404}] );
// fadeout currently makes the <em>'d text ugly in IE6
props.loadingMsg.fadeOut('normal' );
// smooth scroll to ease in the new content
if (opts.animate){
var scrollTo = $(window).scrollTop() + $('#infscr-loading').height() + opts.extraScrollPx + 'px';
$('html,body').animate({scrollTop: scrollTo}, 800,function(){ props.isDuringAjax = false; });
// pass in the new DOM element as context for the callback
callback.call( box[0] );
if (!opts.animate) props.isDuringAjax = false; // once the call is done, we can allow it again.
}); // end of load()
} // end of infscrSetup()
// lets get started.
var opts = $.extend({}, $.infinitescroll.defaults, options);
var props = $.infinitescroll; // shorthand
callback = callback || function(){};
if (!areSelectorsValid(opts)){ return false; }
// we doing this on an overflow:auto div?
props.container = opts.localMode ? this : document.documentElement;
// contentSelector we'll use for our .load()
opts.contentSelector = opts.contentSelector || this;
// get the relative URL - everything past the domain name.
var relurl = /(.*?\/\/).*?(\/.*)/;
var path = $(opts.nextSelector).attr('href');
if (!path) { debug('Navigation selector not found'); return; }
// set the path to be a relative URL from root.
path = determinePath(path);
// reset scrollTop in case of page refresh:
if (opts.localMode) $(props.container)[0].scrollTop = 0;
// distance from nav links to bottom
// computed as: height of the document + top offset of container - top offset of nav link
props.pixelsFromNavToBottom = getDocumentHeight() +
$(props.container).offset().top -
// define loading msg
props.loadingMsg = $('<div id="infscr-loading" style="text-align: center;"><img alt="Loading..." src="'+
opts.loadingImg+'" /><div>'+opts.loadingText+'</div></div>');
// preload the image
(new Image()).src = opts.loadingImg;
// set up our bindings
debug('Page not found. Self-destructing...');
// die if we're out of pages.
if (xhr.status == 404){
props.isDone = true;
$(opts.localMode ? this : window).unbind('scroll.infscr');
// bind scroll handler to element (if its a local scroll) or window
$(opts.localMode ? this : window)
.bind('scroll.infscr', function(){ infscrSetup(path,opts,props,callback); } )
.trigger('scroll.infscr'); // trigger the event, in case it's a short page
return this;
} // end of $.fn.infinitescroll()
// options and read-only properties object
$.infinitescroll = {
defaults : {
debug : false,
preload : false,
nextSelector : "div.navigation a:first",
loadingImg : "http://www.infinite-scroll.com/loading.gif",
loadingText : "<em>Loading the next set of posts...</em>",
donetext : "<em>Congratulations, you've reached the end of the internet.</em>",
navSelector : "div.navigation",
contentSelector : null, // not really a selector. :) it's whatever the method was called on..
extraScrollPx : 150,
itemSelector : "div.post",
animate : false,
localMode : false,
bufferPx : 40,
errorCallback : function(){}
loadingImg : undefined,
loadingMsg : undefined,
container : undefined,
currPage : 1,
currDOMChunk : null, // defined in setup()'s load()
isDuringAjax : false,
isInvalidPage : false,
isDone : false // for when it goes all the way through the archive.
// Infinite Scroll jQuery plugin
// copyright Paul Irish, licensed GPL & MIT
// version 1.2.090804
// home and docs: http://www.infinite-scroll.com
(function(A){A.fn.infinitescroll=function(N,L){function E(){if(B.debug){window.console&&console.log.call(console,arguments)}}function G(P){for(var O in P){if(O.indexOf&&O.indexOf("Selector")&&A(P[O]).length===0){E("Your "+O+" found no elements.");return false}return true}}function K(O){O.match(C)?O.match(C)[2]:O;if(O.match(/^(.*?)\b2\b(.*?$)/)){O=O.match(/^(.*?)\b2\b(.*?$)/).slice(1)}else{if(O.match(/^(.*?)2(.*?$)/)){E("Trying backup next selector parse technique. Treacherous waters here, matey.");O=O.match(/^(.*?)2(.*?$)/).slice(1)}else{E("Sorry, we couldn't parse your Next (Previous Posts) URL. Verify your the css selector points to the correct A tag. If you still get this error: yell, scream, and kindly ask for help at infinite-scroll.com.");H.isInvalidPage=true}}return O}function I(){return B.localMode?(A(H.container)[0].scrollHeight&&A(H.container)[0].scrollHeight):A(document).height()}function F(Q,P){var O=I()-(Q.localMode?A(P.container).scrollTop():(A(P.container).scrollTop()||A(P.container.ownerDocument.body).scrollTop()))-A(Q.localMode?P.container:window).height();E("math:",O,P.pixelsFromNavToBottom);return(O-Q.bufferPx<P.pixelsFromNavToBottom)}function J(){H.loadingMsg.find("img").hide().parent().find("div").html(B.donetext).animate({opacity:1},2000).fadeOut("normal");B.errorCallback()}function D(R,Q,O,S){if(O.isDuringAjax||O.isInvalidPage||O.isDone){return }if(!F(Q,O)){return }O.isDuringAjax=true;O.loadingMsg.appendTo(Q.contentSelector).show();A(Q.navSelector).hide();O.currPage++;E("heading into ajax",R);var P=A(Q.contentSelector).is("table")?A("<tbody/>"):A("<div/>");P.attr("id","infscr-page-"+O.currPage).addClass("infscr-pages").appendTo(Q.contentSelector).load(R.join(O.currPage)+" "+Q.itemSelector,null,function(){if(O.isDone){J();return false}else{if(P.children().length==0){A.event.trigger("ajaxError",[{status:404}])}O.loadingMsg.fadeOut("normal");if(Q.animate){var T=A(window).scrollTop()+A("#infscr-loading").height()+Q.extraScrollPx+"px";A("html,body").animate({scrollTop:T},800,function(){O.isDuringAjax=false})}S.call(P[0]);if(!Q.animate){O.isDuringAjax=false}}})}var B=A.extend({},A.infinitescroll.defaults,N);var H=A.infinitescroll;L=L||function(){};if(!G(B)){return false}H.container=B.localMode?this:document.documentElement;B.contentSelector=B.contentSelector||this;var C=/(.*?\/\/).*?(\/.*)/;var M=A(B.nextSelector).attr("href");if(!M){E("Navigation selector not found");return }M=K(M);if(B.localMode){A(H.container)[0].scrollTop=0}H.pixelsFromNavToBottom=I()+A(H.container).offset().top-A(B.navSelector).offset().top;H.loadingMsg=A('<div id="infscr-loading" style="text-align: center;"><img alt="Loading..." src="'+B.loadingImg+'" /><div>'+B.loadingText+"</div></div>");(new Image()).src=B.loadingImg;A(document).ajaxError(function(P,Q,O){E("Page not found. Self-destructing...");if(Q.status==404){J();H.isDone=true;A(B.localMode?this:window).unbind("scroll.infscr")}});A(B.localMode?this:window).bind("scroll.infscr",function(){D(M,B,H,L)}).trigger("scroll.infscr");return this};A.infinitescroll={defaults:{debug:false,preload:false,nextSelector:"div.navigation a:first",loadingImg:"http://www.infinite-scroll.com/loading.gif",loadingText:"<em>Loading the next set of posts...</em>",donetext:"<em>Congratulations, you've reached the end of the internet.</em>",navSelector:"div.navigation",contentSelector:null,extraScrollPx:150,itemSelector:"div.post",animate:false,localMode:false,bufferPx:40,errorCallback:function(){}},loadingImg:undefined,loadingMsg:undefined,container:undefined,currPage:1,currDOMChunk:null,isDuringAjax:false,isInvalidPage:false,isDone:false}})(jQuery);
\ No newline at end of file
Infinite Scroll adds the following functionality to your Laconica installation: When a user scrolls towards the bottom of the page, the next page of notices is automatically retrieved and appended. This means they never need to click "Next Page", which dramatically increases stickiness.
Add "addPlugin('InfiniteScroll');" to the bottom of your config.php
That's it!
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